ksd:ksdk update to 2.2

This include FreeRTOS update to version 9.0.0

Signed-off-by: Dominik Sliwa <dominik.sliwa@toradex.com>

11 files changed, 847 insertions, 470 deletions

diff --git a/freertos/Source/portable/GCC/ARM_CM3/fsl_tickless_generic.h b/freertos/Source/portable/GCC/ARM_CM3/fsl_tickless_generic.h
new file mode 100644
index 0000000..6579370
--- /dev/null
+++ b/freertos/Source/portable/GCC/ARM_CM3/fsl_tickless_generic.h
@@ -0,0 +1,122 @@
+/*
+    FreeRTOS V9.0.0 - Copyright (C) 2016 Real Time Engineers Ltd.
+    All rights reserved
+
+    VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
+
+    This file is part of the FreeRTOS distribution.
+
+    FreeRTOS is free software; you can redistribute it and/or modify it under
+    the terms of the GNU General Public License (version 2) as published by the
+    Free Software Foundation >>>> AND MODIFIED BY <<<< the FreeRTOS exception.
+
+    ***************************************************************************
+    >>!   NOTE: The modification to the GPL is included to allow you to     !<<
+    >>!   distribute a combined work that includes FreeRTOS without being   !<<
+    >>!   obliged to provide the source code for proprietary components     !<<
+    >>!   outside of the FreeRTOS kernel.                                   !<<
+    ***************************************************************************
+
+    FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+    FOR A PARTICULAR PURPOSE.  Full license text is available on the following
+    link: http://www.freertos.org/a00114.html
+
+    ***************************************************************************
+     *                                                                       *
+     *    FreeRTOS provides completely free yet professionally developed,    *
+     *    robust, strictly quality controlled, supported, and cross          *
+     *    platform software that is more than just the market leader, it     *
+     *    is the industry's de facto standard.                               *
+     *                                                                       *
+     *    Help yourself get started quickly while simultaneously helping     *
+     *    to support the FreeRTOS project by purchasing a FreeRTOS           *
+     *    tutorial book, reference manual, or both:                          *
+     *    http://www.FreeRTOS.org/Documentation                              *
+     *                                                                       *
+    ***************************************************************************
+
+    http://www.FreeRTOS.org/FAQHelp.html - Having a problem?  Start by reading
+    the FAQ page "My application does not run, what could be wrong?".  Have you
+    defined configASSERT()?
+
+    http://www.FreeRTOS.org/support - In return for receiving this top quality
+    embedded software for free we request you assist our global community by
+    participating in the support forum.
+
+    http://www.FreeRTOS.org/training - Investing in training allows your team to
+    be as productive as possible as early as possible.  Now you can receive
+    FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
+    Ltd, and the world's leading authority on the world's leading RTOS.
+
+    http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
+    including FreeRTOS+Trace - an indispensable productivity tool, a DOS
+    compatible FAT file system, and our tiny thread aware UDP/IP stack.
+
+    http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
+    Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
+
+    http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
+    Integrity Systems ltd. to sell under the OpenRTOS brand.  Low cost OpenRTOS
+    licenses offer ticketed support, indemnification and commercial middleware.
+
+    http://www.SafeRTOS.com - High Integrity Systems also provide a safety
+    engineered and independently SIL3 certified version for use in safety and
+    mission critical applications that require provable dependability.
+
+    1 tab == 4 spaces!
+*/
+
+/* This file was separated prom original port.c by SDK team to enable efective tickless idle mode implementation. */
+
+#ifndef FSL_TICKLESS_GENERIC_H
+#define FSL_TICKLESS_GENERIC_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef configSYSTICK_CLOCK_HZ
+	#define configSYSTICK_CLOCK_HZ			configCPU_CLOCK_HZ
+	/* Ensure the SysTick is clocked at the same frequency as the core. */
+	#define portNVIC_SYSTICK_CLK_BIT		( 1UL << 2UL )
+#else
+	/* The way the SysTick is clocked is not modified in case it is not the same
+	as the core. */
+	#define portNVIC_SYSTICK_CLK_BIT		( 0 )
+#endif
+
+/* Constants required to manipulate the core.  Registers first... */
+#define portNVIC_SYSTICK_CTRL_REG			( * ( ( volatile uint32_t * ) 0xe000e010 ) )
+#define portNVIC_SYSTICK_LOAD_REG			( * ( ( volatile uint32_t * ) 0xe000e014 ) )
+#define portNVIC_SYSTICK_CURRENT_VALUE_REG	( * ( ( volatile uint32_t * ) 0xe000e018 ) )
+#define portNVIC_SYSPRI2_REG				( * ( ( volatile uint32_t * ) 0xe000ed20 ) )
+
+/* ...then bits in the registers. */
+#define portNVIC_SYSTICK_INT_BIT			( 1UL << 1UL )
+#define portNVIC_SYSTICK_ENABLE_BIT			( 1UL << 0UL )
+#define portNVIC_SYSTICK_COUNT_FLAG_BIT		( 1UL << 16UL )
+#define portNVIC_PENDSVCLEAR_BIT			( 1UL << 27UL )
+#define portNVIC_PEND_SYSTICK_CLEAR_BIT		( 1UL << 25UL )
+
+/* The systick is a 24-bit counter. */
+#define portMAX_24_BIT_NUMBER				( 0xffffffUL )
+
+/* The LPTMR is a 16-bit counter. */
+#define portMAX_16_BIT_NUMBER				( 0xffffUL )
+
+/* A fiddle factor to estimate the number of SysTick counts that would have
+occurred while the SysTick counter is stopped during tickless idle
+calculations. */
+#define portMISSED_COUNTS_FACTOR			( 45UL )
+
+/*
+ * Setup the timer to generate the tick interrupts.
+ */
+void vPortSetupTimerInterrupt( void );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* FSL_TICKLESS_GENERIC_H */
diff --git a/freertos/Source/portable/GCC/ARM_CM3/fsl_tickless_lptmr.c b/freertos/Source/portable/GCC/ARM_CM3/fsl_tickless_lptmr.c
new file mode 100644
index 0000000..c23eaaa
--- /dev/null
+++ b/freertos/Source/portable/GCC/ARM_CM3/fsl_tickless_lptmr.c
@@ -0,0 +1,260 @@
+/*
+    FreeRTOS V9.0.0 - Copyright (C) 2016 Real Time Engineers Ltd.
+    All rights reserved
+
+    VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
+
+    This file is part of the FreeRTOS distribution.
+
+    FreeRTOS is free software; you can redistribute it and/or modify it under
+    the terms of the GNU General Public License (version 2) as published by the
+    Free Software Foundation >>>> AND MODIFIED BY <<<< the FreeRTOS exception.
+
+    ***************************************************************************
+    >>!   NOTE: The modification to the GPL is included to allow you to     !<<
+    >>!   distribute a combined work that includes FreeRTOS without being   !<<
+    >>!   obliged to provide the source code for proprietary components     !<<
+    >>!   outside of the FreeRTOS kernel.                                   !<<
+    ***************************************************************************
+
+    FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+    FOR A PARTICULAR PURPOSE.  Full license text is available on the following
+    link: http://www.freertos.org/a00114.html
+
+    ***************************************************************************
+     *                                                                       *
+     *    FreeRTOS provides completely free yet professionally developed,    *
+     *    robust, strictly quality controlled, supported, and cross          *
+     *    platform software that is more than just the market leader, it     *
+     *    is the industry's de facto standard.                               *
+     *                                                                       *
+     *    Help yourself get started quickly while simultaneously helping     *
+     *    to support the FreeRTOS project by purchasing a FreeRTOS           *
+     *    tutorial book, reference manual, or both:                          *
+     *    http://www.FreeRTOS.org/Documentation                              *
+     *                                                                       *
+    ***************************************************************************
+
+    http://www.FreeRTOS.org/FAQHelp.html - Having a problem?  Start by reading
+    the FAQ page "My application does not run, what could be wrong?".  Have you
+    defined configASSERT()?
+
+    http://www.FreeRTOS.org/support - In return for receiving this top quality
+    embedded software for free we request you assist our global community by
+    participating in the support forum.
+
+    http://www.FreeRTOS.org/training - Investing in training allows your team to
+    be as productive as possible as early as possible.  Now you can receive
+    FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
+    Ltd, and the world's leading authority on the world's leading RTOS.
+
+    http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
+    including FreeRTOS+Trace - an indispensable productivity tool, a DOS
+    compatible FAT file system, and our tiny thread aware UDP/IP stack.
+
+    http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
+    Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
+
+    http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
+    Integrity Systems ltd. to sell under the OpenRTOS brand.  Low cost OpenRTOS
+    licenses offer ticketed support, indemnification and commercial middleware.
+
+    http://www.SafeRTOS.com - High Integrity Systems also provide a safety
+    engineered and independently SIL3 certified version for use in safety and
+    mission critical applications that require provable dependability.
+
+    1 tab == 4 spaces!
+*/
+#include "FreeRTOS.h"
+#include "task.h"
+#include "fsl_tickless_generic.h"
+
+#if configUSE_TICKLESS_IDLE == 1
+#include "fsl_lptmr.h"
+#endif
+
+extern uint32_t SystemCoreClock; /* in Kinetis SDK, this contains the system core clock speed */
+
+/*
+ * LPT timer base address and interrupt number
+ */
+
+#if configUSE_TICKLESS_IDLE == 1
+	extern LPTMR_Type *vPortGetLptrmBase(void);
+	extern IRQn_Type vPortGetLptmrIrqn(void);
+#endif /* configUSE_TICKLESS_IDLE */
+
+/*
+ * The number of SysTick increments that make up one tick period.
+ */
+#if configUSE_TICKLESS_IDLE == 1
+	static uint32_t ulTimerCountsForOneTick = 0;
+#endif /* configUSE_TICKLESS_IDLE */
+
+/*
+ * The maximum number of tick periods that can be suppressed is limited by the
+ * 24 bit resolution of the SysTick timer.
+ */
+#if configUSE_TICKLESS_IDLE == 1
+	static uint32_t xMaximumPossibleSuppressedTicks = 0;
+#endif /* configUSE_TICKLESS_IDLE */
+
+/*
+ * The number of LPTIMER increments that make up one tick period.
+ */
+#if configUSE_TICKLESS_IDLE == 1
+	static uint32_t ulLPTimerCountsForOneTick = 0;
+#endif /* configUSE_TICKLESS_IDLE */
+
+/*
+ * The flag of LPTIMER is occurs or not.
+ */
+#if configUSE_TICKLESS_IDLE == 1
+	static volatile bool ulLPTimerInterruptFired = false;
+#endif /* configUSE_TICKLESS_IDLE */
+
+#if configUSE_TICKLESS_IDLE == 1
+void vPortLptmrIsr(void)
+{
+	ulLPTimerInterruptFired = true;
+	LPTMR_ClearStatusFlags(vPortGetLptrmBase(), kLPTMR_TimerCompareFlag);
+}
+
+void vPortSuppressTicksAndSleep( TickType_t xExpectedIdleTime )
+{
+	uint32_t ulReloadValue, ulCompleteTickPeriods;
+	TickType_t xModifiableIdleTime;
+	LPTMR_Type *pxLptmrBase;
+
+	pxLptmrBase = vPortGetLptrmBase();
+	if (pxLptmrBase == 0) return;
+	/* Make sure the SysTick reload value does not overflow the counter. */
+	if( xExpectedIdleTime > xMaximumPossibleSuppressedTicks )
+	{
+		xExpectedIdleTime = xMaximumPossibleSuppressedTicks;
+	}
+	if (xExpectedIdleTime == 0) return;
+	/* Calculate the reload value required to wait xExpectedIdleTime
+	tick periods.  -1 is used because this code will execute part way
+	through one of the tick periods. */
+	ulReloadValue = LPTMR_GetCurrentTimerCount(pxLptmrBase) + ( ulLPTimerCountsForOneTick * ( xExpectedIdleTime - 1UL ) );
+
+	/* Stop the LPTMR and systick momentarily.  The time the LPTMR and systick is stopped for
+	is accounted for as best it can be, but using the tickless mode will
+	inevitably result in some tiny drift of the time maintained by the
+	kernel with respect to calendar time. */
+	LPTMR_StopTimer(pxLptmrBase);
+	portNVIC_SYSTICK_CTRL_REG &= ~portNVIC_SYSTICK_ENABLE_BIT;
+
+	/* Enter a critical section but don't use the taskENTER_CRITICAL()
+	method as that will mask interrupts that should exit sleep mode. */
+	__asm volatile( "cpsid i" );
+	__asm volatile( "dsb" );
+	__asm volatile( "isb" );
+
+	/* If a context switch is pending or a task is waiting for the scheduler
+	to be unsuspended then abandon the low power entry. */
+	if( eTaskConfirmSleepModeStatus() == eAbortSleep )
+	{
+		/* Restart from whatever is left in the count register to complete
+		this tick period. */
+		portNVIC_SYSTICK_LOAD_REG = portNVIC_SYSTICK_CURRENT_VALUE_REG;
+
+		/* Restart SysTick. */
+		portNVIC_SYSTICK_CTRL_REG |= portNVIC_SYSTICK_ENABLE_BIT;
+
+		/* Reset the reload register to the value required for normal tick
+		periods. */
+		portNVIC_SYSTICK_LOAD_REG = ulTimerCountsForOneTick - 1UL;
+
+		/* Re-enable interrupts - see comments above the cpsid instruction()
+		above. */
+		__asm volatile( "cpsie i" );
+	}
+	else
+	{
+		/* Set the new reload value. */
+		LPTMR_SetTimerPeriod(pxLptmrBase, ulReloadValue);
+
+		/* Enable LPTMR. */
+		LPTMR_StartTimer(pxLptmrBase);
+
+
+		/* Sleep until something happens.  configPRE_SLEEP_PROCESSING() can
+		set its parameter to 0 to indicate that its implementation contains
+		its own wait for interrupt or wait for event instruction, and so wfi
+		should not be executed again.  However, the original expected idle
+		time variable must remain unmodified, so a copy is taken. */
+		xModifiableIdleTime = xExpectedIdleTime;
+		configPRE_SLEEP_PROCESSING( xModifiableIdleTime );
+		if( xModifiableIdleTime > 0 )
+		{
+			__asm volatile( "dsb" );
+			__asm volatile( "wfi" );
+			__asm volatile( "isb" );
+		}
+		configPOST_SLEEP_PROCESSING( xExpectedIdleTime );
+
+		ulLPTimerInterruptFired = false;
+
+		/* Re-enable interrupts - see comments above the cpsid instruction()
+		above. */
+		__asm volatile( "cpsie i" );
+		__NOP();
+		if( ulLPTimerInterruptFired )
+		{
+			/* The tick interrupt handler will already have pended the tick
+			processing in the kernel.  As the pending tick will be
+			processed as soon as this function exits, the tick value
+			maintained by the tick is stepped forward by one less than the
+			time spent waiting. */
+			ulCompleteTickPeriods = xExpectedIdleTime - 1UL;
+			ulLPTimerInterruptFired = false;
+		}
+		else
+		{
+			/* Something other than the tick interrupt ended the sleep.
+			Work out how long the sleep lasted rounded to complete tick
+			periods (not the ulReload value which accounted for part
+			ticks). */
+			ulCompleteTickPeriods = LPTMR_GetCurrentTimerCount(pxLptmrBase)/ulLPTimerCountsForOneTick;
+		}
+
+		/* Stop LPTMR when CPU waked up then set portNVIC_SYSTICK_LOAD_REG back to its standard
+		value.  The critical section is used to ensure the tick interrupt
+		can only execute once in the case that the reload register is near
+		zero. */
+		LPTMR_StopTimer(pxLptmrBase);
+		portENTER_CRITICAL();
+		{
+			portNVIC_SYSTICK_CTRL_REG |= portNVIC_SYSTICK_ENABLE_BIT;
+			vTaskStepTick( ulCompleteTickPeriods );
+			portNVIC_SYSTICK_LOAD_REG = ulTimerCountsForOneTick - 1UL;
+		}
+		portEXIT_CRITICAL();
+	}
+}
+#endif /* #if configUSE_TICKLESS_IDLE */
+
+/*
+ * Setup the systick timer to generate the tick interrupts at the required
+ * frequency.
+ */
+void vPortSetupTimerInterrupt( void )
+{
+	/* Calculate the constants required to configure the tick interrupt. */
+	#if( configUSE_TICKLESS_IDLE == 1 )
+	{
+		ulTimerCountsForOneTick = ( configSYSTICK_CLOCK_HZ / configTICK_RATE_HZ );
+		ulLPTimerCountsForOneTick = ( configLPTMR_CLOCK_HZ / configTICK_RATE_HZ );
+		xMaximumPossibleSuppressedTicks = portMAX_16_BIT_NUMBER / ulLPTimerCountsForOneTick;
+		NVIC_EnableIRQ(vPortGetLptmrIrqn());
+	}
+	#endif /* configUSE_TICKLESS_IDLE */
+
+	/* Configure SysTick to interrupt at the requested rate. */
+	portNVIC_SYSTICK_LOAD_REG = ( configSYSTICK_CLOCK_HZ / configTICK_RATE_HZ ) - 1UL;
+	portNVIC_SYSTICK_CURRENT_VALUE_REG = 0UL;
+	portNVIC_SYSTICK_CTRL_REG = ( portNVIC_SYSTICK_CLK_BIT | portNVIC_SYSTICK_INT_BIT | portNVIC_SYSTICK_ENABLE_BIT );
+}
diff --git a/freertos/Source/portable/GCC/ARM_CM3/fsl_tickless_systick.c b/freertos/Source/portable/GCC/ARM_CM3/fsl_tickless_systick.c
new file mode 100644
index 0000000..c75613d
--- /dev/null
+++ b/freertos/Source/portable/GCC/ARM_CM3/fsl_tickless_systick.c
@@ -0,0 +1,273 @@
+/*
+    FreeRTOS V9.0.0 - Copyright (C) 2016 Real Time Engineers Ltd.
+    All rights reserved
+
+    VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
+
+    This file is part of the FreeRTOS distribution.
+
+    FreeRTOS is free software; you can redistribute it and/or modify it under
+    the terms of the GNU General Public License (version 2) as published by the
+    Free Software Foundation >>>> AND MODIFIED BY <<<< the FreeRTOS exception.
+
+    ***************************************************************************
+    >>!   NOTE: The modification to the GPL is included to allow you to     !<<
+    >>!   distribute a combined work that includes FreeRTOS without being   !<<
+    >>!   obliged to provide the source code for proprietary components     !<<
+    >>!   outside of the FreeRTOS kernel.                                   !<<
+    ***************************************************************************
+
+    FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+    FOR A PARTICULAR PURPOSE.  Full license text is available on the following
+    link: http://www.freertos.org/a00114.html
+
+    ***************************************************************************
+     *                                                                       *
+     *    FreeRTOS provides completely free yet professionally developed,    *
+     *    robust, strictly quality controlled, supported, and cross          *
+     *    platform software that is more than just the market leader, it     *
+     *    is the industry's de facto standard.                               *
+     *                                                                       *
+     *    Help yourself get started quickly while simultaneously helping     *
+     *    to support the FreeRTOS project by purchasing a FreeRTOS           *
+     *    tutorial book, reference manual, or both:                          *
+     *    http://www.FreeRTOS.org/Documentation                              *
+     *                                                                       *
+    ***************************************************************************
+
+    http://www.FreeRTOS.org/FAQHelp.html - Having a problem?  Start by reading
+    the FAQ page "My application does not run, what could be wrong?".  Have you
+    defined configASSERT()?
+
+    http://www.FreeRTOS.org/support - In return for receiving this top quality
+    embedded software for free we request you assist our global community by
+    participating in the support forum.
+
+    http://www.FreeRTOS.org/training - Investing in training allows your team to
+    be as productive as possible as early as possible.  Now you can receive
+    FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
+    Ltd, and the world's leading authority on the world's leading RTOS.
+
+    http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
+    including FreeRTOS+Trace - an indispensable productivity tool, a DOS
+    compatible FAT file system, and our tiny thread aware UDP/IP stack.
+
+    http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
+    Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
+
+    http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
+    Integrity Systems ltd. to sell under the OpenRTOS brand.  Low cost OpenRTOS
+    licenses offer ticketed support, indemnification and commercial middleware.
+
+    http://www.SafeRTOS.com - High Integrity Systems also provide a safety
+    engineered and independently SIL3 certified version for use in safety and
+    mission critical applications that require provable dependability.
+
+    1 tab == 4 spaces!
+*/
+#include "FreeRTOS.h"
+#include "task.h"
+#include "fsl_tickless_generic.h"
+
+extern uint32_t SystemCoreClock; /* in Kinetis SDK, this contains the system core clock speed */
+
+/*
+ * The number of SysTick increments that make up one tick period.
+ */
+#if configUSE_TICKLESS_IDLE == 1
+	static uint32_t ulTimerCountsForOneTick = 0;
+#endif /* configUSE_TICKLESS_IDLE */
+
+/*
+ * The maximum number of tick periods that can be suppressed is limited by the
+ * 24 bit resolution of the SysTick timer.
+ */
+#if configUSE_TICKLESS_IDLE == 1
+	static uint32_t xMaximumPossibleSuppressedTicks = 0;
+#endif /* configUSE_TICKLESS_IDLE */
+
+/*
+ * Compensate for the CPU cycles that pass while the SysTick is stopped (low
+ * power functionality only.
+ */
+#if configUSE_TICKLESS_IDLE == 1
+	static uint32_t ulStoppedTimerCompensation = 0;
+#endif /* configUSE_TICKLESS_IDLE */
+
+
+/*-----------------------------------------------------------*/
+#if configUSE_TICKLESS_IDLE == 1
+
+	__attribute__((weak)) void vPortSuppressTicksAndSleep( TickType_t xExpectedIdleTime )
+	{
+	uint32_t ulReloadValue, ulCompleteTickPeriods, ulCompletedSysTickDecrements, ulSysTickCTRL;
+	TickType_t xModifiableIdleTime;
+
+		/* Make sure the SysTick reload value does not overflow the counter. */
+		if( xExpectedIdleTime > xMaximumPossibleSuppressedTicks )
+		{
+			xExpectedIdleTime = xMaximumPossibleSuppressedTicks;
+		}
+		if (xExpectedIdleTime == 0) return;
+		/* Stop the SysTick momentarily.  The time the SysTick is stopped for
+		is accounted for as best it can be, but using the tickless mode will
+		inevitably result in some tiny drift of the time maintained by the
+		kernel with respect to calendar time. */
+		portNVIC_SYSTICK_CTRL_REG &= ~portNVIC_SYSTICK_ENABLE_BIT;
+
+		/* Calculate the reload value required to wait xExpectedIdleTime
+		tick periods.  -1 is used because this code will execute part way
+		through one of the tick periods. */
+		ulReloadValue = portNVIC_SYSTICK_CURRENT_VALUE_REG + ( ulTimerCountsForOneTick * ( xExpectedIdleTime - 1UL ) );
+		if( ulReloadValue > ulStoppedTimerCompensation )
+		{
+			ulReloadValue -= ulStoppedTimerCompensation;
+		}
+
+		/* Enter a critical section but don't use the taskENTER_CRITICAL()
+		method as that will mask interrupts that should exit sleep mode. */
+		__asm volatile( "cpsid i" );
+		__asm volatile( "dsb" );
+		__asm volatile( "isb" );
+
+		/* If a context switch is pending or a task is waiting for the scheduler
+		to be unsuspended then abandon the low power entry. */
+		if( eTaskConfirmSleepModeStatus() == eAbortSleep )
+		{
+			/* Restart from whatever is left in the count register to complete
+			this tick period. */
+			portNVIC_SYSTICK_LOAD_REG = portNVIC_SYSTICK_CURRENT_VALUE_REG;
+
+			/* Restart SysTick. */
+			portNVIC_SYSTICK_CTRL_REG |= portNVIC_SYSTICK_ENABLE_BIT;
+
+			/* Reset the reload register to the value required for normal tick
+			periods. */
+			portNVIC_SYSTICK_LOAD_REG = ulTimerCountsForOneTick - 1UL;
+
+			/* Re-enable interrupts - see comments above the cpsid instruction()
+			above. */
+			__asm volatile( "cpsie i" );
+		}
+		else
+		{
+			/* Set the new reload value. */
+			portNVIC_SYSTICK_LOAD_REG = ulReloadValue;
+
+			/* Clear the SysTick count flag and set the count value back to
+			zero. */
+			portNVIC_SYSTICK_CURRENT_VALUE_REG = 0UL;
+
+			/* Restart SysTick. */
+			portNVIC_SYSTICK_CTRL_REG |= portNVIC_SYSTICK_ENABLE_BIT;
+
+			/* Sleep until something happens.  configPRE_SLEEP_PROCESSING() can
+			set its parameter to 0 to indicate that its implementation contains
+			its own wait for interrupt or wait for event instruction, and so wfi
+			should not be executed again.  However, the original expected idle
+			time variable must remain unmodified, so a copy is taken. */
+			xModifiableIdleTime = xExpectedIdleTime;
+			configPRE_SLEEP_PROCESSING( xModifiableIdleTime );
+			if( xModifiableIdleTime > 0 )
+			{
+				__asm volatile( "dsb" );
+				__asm volatile( "wfi" );
+				__asm volatile( "isb" );
+			}
+			configPOST_SLEEP_PROCESSING( xExpectedIdleTime );
+
+			/* Stop SysTick.  Again, the time the SysTick is stopped for is
+			accounted for as best it can be, but using the tickless mode will
+			inevitably result in some tiny drift of the time maintained by the
+			kernel with respect to calendar time. */
+			ulSysTickCTRL = portNVIC_SYSTICK_CTRL_REG;
+			portNVIC_SYSTICK_CTRL_REG = ( ulSysTickCTRL & ~portNVIC_SYSTICK_ENABLE_BIT );
+
+			/* Re-enable interrupts - see comments above the cpsid instruction()
+			above. */
+			__asm volatile( "cpsie i" );
+
+			if( ( ulSysTickCTRL & portNVIC_SYSTICK_COUNT_FLAG_BIT ) != 0 )
+			{
+				uint32_t ulCalculatedLoadValue;
+
+				/* The tick interrupt has already executed, and the SysTick
+				count reloaded with ulReloadValue.  Reset the
+				portNVIC_SYSTICK_LOAD_REG with whatever remains of this tick
+				period. */
+				ulCalculatedLoadValue = ( ulTimerCountsForOneTick - 1UL ) - ( ulReloadValue - portNVIC_SYSTICK_CURRENT_VALUE_REG );
+
+				/* Don't allow a tiny value, or values that have somehow
+				underflowed because the post sleep hook did something
+				that took too long. */
+				if( ( ulCalculatedLoadValue < ulStoppedTimerCompensation ) || ( ulCalculatedLoadValue > ulTimerCountsForOneTick ) )
+				{
+					ulCalculatedLoadValue = ( ulTimerCountsForOneTick - 1UL );
+				}
+
+				portNVIC_SYSTICK_LOAD_REG = ulCalculatedLoadValue;
+
+				/* The tick interrupt handler will already have pended the tick
+				processing in the kernel.  As the pending tick will be
+				processed as soon as this function exits, the tick value
+				maintained by the tick is stepped forward by one less than the
+				time spent waiting. */
+				ulCompleteTickPeriods = xExpectedIdleTime - 1UL;
+			}
+			else
+			{
+				/* Something other than the tick interrupt ended the sleep.
+				Work out how long the sleep lasted rounded to complete tick
+				periods (not the ulReload value which accounted for part
+				ticks). */
+				ulCompletedSysTickDecrements = ( xExpectedIdleTime * ulTimerCountsForOneTick ) - portNVIC_SYSTICK_CURRENT_VALUE_REG;
+
+				/* How many complete tick periods passed while the processor
+				was waiting? */
+				ulCompleteTickPeriods = ulCompletedSysTickDecrements / ulTimerCountsForOneTick;
+
+				/* The reload value is set to whatever fraction of a single tick
+				period remains. */
+				portNVIC_SYSTICK_LOAD_REG = ( ( ulCompleteTickPeriods + 1UL ) * ulTimerCountsForOneTick ) - ulCompletedSysTickDecrements;
+			}
+
+			/* Restart SysTick so it runs from portNVIC_SYSTICK_LOAD_REG
+			again, then set portNVIC_SYSTICK_LOAD_REG back to its standard
+			value.  The critical section is used to ensure the tick interrupt
+			can only execute once in the case that the reload register is near
+			zero. */
+			portNVIC_SYSTICK_CURRENT_VALUE_REG = 0UL;
+			portENTER_CRITICAL();
+			{
+				portNVIC_SYSTICK_CTRL_REG |= portNVIC_SYSTICK_ENABLE_BIT;
+				vTaskStepTick( ulCompleteTickPeriods );
+				portNVIC_SYSTICK_LOAD_REG = ulTimerCountsForOneTick - 1UL;
+			}
+			portEXIT_CRITICAL();
+		}
+	}
+
+#endif /* #if configUSE_TICKLESS_IDLE */
+/*-----------------------------------------------------------*/
+
+/*
+ * Setup the systick timer to generate the tick interrupts at the required
+ * frequency.
+ */
+__attribute__(( weak )) void vPortSetupTimerInterrupt( void )
+{
+	/* Calculate the constants required to configure the tick interrupt. */
+	#if configUSE_TICKLESS_IDLE == 1
+	{
+		ulTimerCountsForOneTick = ( configSYSTICK_CLOCK_HZ / configTICK_RATE_HZ );
+		xMaximumPossibleSuppressedTicks = portMAX_24_BIT_NUMBER / ulTimerCountsForOneTick;
+		ulStoppedTimerCompensation = portMISSED_COUNTS_FACTOR / ( configCPU_CLOCK_HZ / configSYSTICK_CLOCK_HZ );
+	}
+	#endif /* configUSE_TICKLESS_IDLE */
+
+	/* Configure SysTick to interrupt at the requested rate. */
+	portNVIC_SYSTICK_LOAD_REG = ( configSYSTICK_CLOCK_HZ / configTICK_RATE_HZ ) - 1UL;
+	portNVIC_SYSTICK_CURRENT_VALUE_REG = 0UL;
+	portNVIC_SYSTICK_CTRL_REG = ( portNVIC_SYSTICK_CLK_BIT | portNVIC_SYSTICK_INT_BIT | portNVIC_SYSTICK_ENABLE_BIT );
+}
diff --git a/freertos/Source/portable/GCC/ARM_CM3/port.c b/freertos/Source/portable/GCC/ARM_CM3/port.c
index 1d5ed30..34d33d3 100644
--- a/freertos/Source/portable/GCC/ARM_CM3/port.c
+++ b/freertos/Source/portable/GCC/ARM_CM3/port.c
@@ -1,5 +1,5 @@
 /*
-    FreeRTOS V8.2.3 - Copyright (C) 2015 Real Time Engineers Ltd.
+    FreeRTOS V9.0.0 - Copyright (C) 2016 Real Time Engineers Ltd.
     All rights reserved
 
     VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
@@ -74,10 +74,7 @@
 /* Scheduler includes. */
 #include "FreeRTOS.h"
 #include "task.h"
-
-#if configSYSTICK_USE_LOW_POWER_TIMER
-#include "fsl_lptmr.h"
-#endif
+#include "fsl_tickless_generic.h"
 
 extern uint32_t SystemCoreClock; /* in Kinetis SDK, this contains the system core clock speed */
 
@@ -88,27 +85,7 @@ FreeRTOS.org versions prior to V4.4.0 did not include this definition. */
 	#define configKERNEL_INTERRUPT_PRIORITY 255
 #endif
 
-#ifndef configSYSTICK_CLOCK_HZ
-	#define configSYSTICK_CLOCK_HZ configCPU_CLOCK_HZ
-	/* Ensure the SysTick is clocked at the same frequency as the core. */
-	#define portNVIC_SYSTICK_CLK_BIT	( 1UL << 2UL )
-#else
-	/* The way the SysTick is clocked is not modified in case it is not the same
-	as the core. */
-	#define portNVIC_SYSTICK_CLK_BIT	( 0 )
-#endif
 
-/* Constants required to manipulate the core.  Registers first... */
-#define portNVIC_SYSTICK_CTRL_REG			( * ( ( volatile uint32_t * ) 0xe000e010 ) )
-#define portNVIC_SYSTICK_LOAD_REG			( * ( ( volatile uint32_t * ) 0xe000e014 ) )
-#define portNVIC_SYSTICK_CURRENT_VALUE_REG	( * ( ( volatile uint32_t * ) 0xe000e018 ) )
-#define portNVIC_SYSPRI2_REG				( * ( ( volatile uint32_t * ) 0xe000ed20 ) )
-/* ...then bits in the registers. */
-#define portNVIC_SYSTICK_INT_BIT			( 1UL << 1UL )
-#define portNVIC_SYSTICK_ENABLE_BIT			( 1UL << 0UL )
-#define portNVIC_SYSTICK_COUNT_FLAG_BIT		( 1UL << 16UL )
-#define portNVIC_PENDSVCLEAR_BIT 			( 1UL << 27UL )
-#define portNVIC_PEND_SYSTICK_CLEAR_BIT		( 1UL << 25UL )
 
 #define portNVIC_PENDSV_PRI					( ( ( uint32_t ) configKERNEL_INTERRUPT_PRIORITY ) << 16UL )
 #define portNVIC_SYSTICK_PRI				( ( ( uint32_t ) configKERNEL_INTERRUPT_PRIORITY ) << 24UL )
@@ -129,17 +106,11 @@ FreeRTOS.org versions prior to V4.4.0 did not include this definition. */
 /* Constants required to set up the initial stack. */
 #define portINITIAL_XPSR					( 0x01000000UL )
 
-/* The systick is a 24-bit counter. */
-#define portMAX_24_BIT_NUMBER				( 0xffffffUL )
-
-/* The LPTMR is a 16-bit counter. */
-#define portMAX_16_BIT_NUMBER                ( 0xffffUL )
 
 
-/* A fiddle factor to estimate the number of SysTick counts that would have
-occurred while the SysTick counter is stopped during tickless idle
-calculations. */
-#define portMISSED_COUNTS_FACTOR			( 45UL )
+/* For strict compliance with the Cortex-M spec the task start address should
+have bit-0 clear, as it is loaded into the PC on exit from an ISR. */
+#define portSTART_ADDRESS_MASK				( ( StackType_t ) 0xfffffffeUL )
 
 /* Let the user override the pre-loading of the initial LR with the address of
 prvTaskExitError() in case it messes up unwinding of the stack in the
@@ -155,13 +126,6 @@ variable. */
 static UBaseType_t uxCriticalNesting = 0xaaaaaaaa;
 
 /*
- * Setup the timer to generate the tick interrupts.  The implementation in this
- * file is weak to allow application writers to change the timer used to
- * generate the tick interrupt.
- */
-void vPortSetupTimerInterrupt( void );
-
-/*
  * Exception handlers.
  */
 void xPortPendSVHandler( void ) __attribute__ (( naked ));
@@ -178,56 +142,9 @@ static void prvPortStartFirstTask( void ) __attribute__ (( naked ));
  */
 static void prvTaskExitError( void );
 
-/*
- * LPT timer base address and interrupt number
- */
-
-#if configSYSTICK_USE_LOW_POWER_TIMER == 1
-   extern LPTMR_Type *vPortGetLptrmBase(void);
-   extern IRQn_Type vPortGetLptmrIrqn(void);
-#endif /* configSYSTICK_USE_LOW_POWER_TIMER */
-    
 /*-----------------------------------------------------------*/
 
 /*
- * The number of SysTick increments that make up one tick period.
- */
-#if configUSE_TICKLESS_IDLE == 1
-	static uint32_t ulTimerCountsForOneTick = 0;
-#endif /* configUSE_TICKLESS_IDLE */
-
-/*
- * The number of SysTick increments that make up one tick period.
- */
-#if configSYSTICK_USE_LOW_POWER_TIMER == 1
-    static uint32_t ulLPTimerCountsForOneTick = 0;
-#endif /* configSYSTICK_USE_LOW_POWER_TIMER */
-
-/*
- * The flag of LPTIEMR is occurs or not.
- */
-#if configSYSTICK_USE_LOW_POWER_TIMER == 1
-    static volatile bool ulLPTimerInterruptFired = false;
-#endif /* configSYSTICK_USE_LOW_POWER_TIMER */
-
-
-/*
- * The maximum number of tick periods that can be suppressed is limited by the
- * 24 bit resolution of the SysTick timer.
- */
-#if configUSE_TICKLESS_IDLE == 1
-	static uint32_t xMaximumPossibleSuppressedTicks = 0;
-#endif /* configUSE_TICKLESS_IDLE */
-
-/*
- * Compensate for the CPU cycles that pass while the SysTick is stopped (low
- * power functionality only.
- */
-#if configUSE_TICKLESS_IDLE == 1
-	static uint32_t ulStoppedTimerCompensation = 0;
-#endif /* configUSE_TICKLESS_IDLE */
-
-/*
  * Used by the portASSERT_IF_INTERRUPT_PRIORITY_INVALID() macro to ensure
  * FreeRTOS API functions are not called from interrupts that have been assigned
  * a priority above configMAX_SYSCALL_INTERRUPT_PRIORITY.
@@ -250,7 +167,7 @@ StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t px
 	pxTopOfStack--; /* Offset added to account for the way the MCU uses the stack on entry/exit of interrupts. */
 	*pxTopOfStack = portINITIAL_XPSR;	/* xPSR */
 	pxTopOfStack--;
-	*pxTopOfStack = ( StackType_t ) pxCode;	/* PC */
+	*pxTopOfStack = ( ( StackType_t ) pxCode ) & portSTART_ADDRESS_MASK;	/* PC */
 	pxTopOfStack--;
 	*pxTopOfStack = ( StackType_t ) portTASK_RETURN_ADDRESS;	/* LR */
 	pxTopOfStack -= 5;	/* R12, R3, R2 and R1. */
@@ -289,7 +206,7 @@ void vPortSVCHandler( void )
 					"	orr r14, #0xd					\n"
 					"	bx r14							\n"
 					"									\n"
-					"	.align 2						\n"
+					"	.align 4						\n"
 					"pxCurrentTCBConst2: .word pxCurrentTCB				\n"
 				);
 }
@@ -398,27 +315,13 @@ void vPortEndScheduler( void )
 }
 /*-----------------------------------------------------------*/
 
-void vPortYield( void )
-{
-	/* Set a PendSV to request a context switch. */
-	portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT;
-
-	/* Barriers are normally not required but do ensure the code is completely
-	within the specified behaviour for the architecture. */
-	__asm volatile( "dsb" );
-	__asm volatile( "isb" );
-}
-/*-----------------------------------------------------------*/
-
 void vPortEnterCritical( void )
 {
 	portDISABLE_INTERRUPTS();
 	uxCriticalNesting++;
-	__asm volatile( "dsb" );
-	__asm volatile( "isb" );
-	
+
 	/* This is not the interrupt safe version of the enter critical function so
-	assert() if it is being called from an interrupt context.  Only API 
+	assert() if it is being called from an interrupt context.  Only API
 	functions that end in "FromISR" can be used in an interrupt.  Only assert if
 	the critical nesting count is 1 to protect against recursive calls if the
 	assert function also uses a critical section. */
@@ -440,37 +343,6 @@ void vPortExitCritical( void )
 }
 /*-----------------------------------------------------------*/
 
-__attribute__(( naked )) uint32_t ulPortSetInterruptMask( void )
-{
-	__asm volatile														\
-	(																	\
-		"	mrs r0, basepri											\n" \
-		"	mov r1, %0												\n"	\
-		"	msr basepri, r1											\n" \
-		"	bx lr													\n" \
-		:: "i" ( configMAX_SYSCALL_INTERRUPT_PRIORITY ) : "r0", "r1"	\
-	);
-
-	/* This return will not be reached but is necessary to prevent compiler
-	warnings. */
-	return 0;
-}
-/*-----------------------------------------------------------*/
-
-__attribute__(( naked )) void vPortClearInterruptMask( uint32_t ulNewMaskValue )
-{
-	__asm volatile													\
-	(																\
-		"	msr basepri, r0										\n"	\
-		"	bx lr												\n" \
-		:::"r0"														\
-	);
-
-	/* Just to avoid compiler warnings. */
-	( void ) ulNewMaskValue;
-}
-/*-----------------------------------------------------------*/
-
 void xPortPendSVHandler( void )
 {
 	/* This is a naked function. */
@@ -501,7 +373,7 @@ void xPortPendSVHandler( void )
 	"	isb									\n"
 	"	bx r14								\n"
 	"										\n"
-	"	.align 2							\n"
+	"	.align 4							\n"
 	"pxCurrentTCBConst: .word pxCurrentTCB	\n"
 	::"i"(configMAX_SYSCALL_INTERRUPT_PRIORITY)
 	);
@@ -514,7 +386,7 @@ void xPortSysTickHandler( void )
 	executes all interrupts must be unmasked.  There is therefore no need to
 	save and then restore the interrupt mask value as its value is already
 	known. */
-	( void ) portSET_INTERRUPT_MASK_FROM_ISR();
+	portDISABLE_INTERRUPTS();
 	{
 		/* Increment the RTOS tick. */
 		if( xTaskIncrementTick() != pdFALSE )
@@ -524,316 +396,8 @@ void xPortSysTickHandler( void )
 			portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT;
 		}
 	}
-	portCLEAR_INTERRUPT_MASK_FROM_ISR( 0 );
+	portENABLE_INTERRUPTS();
 }
-/*-----------------------------------------------------------*/
-
-#if configUSE_TICKLESS_IDLE == 1
-#if configSYSTICK_USE_LOW_POWER_TIMER == 1
-
-    void vPortLptmrIsr(void)
-    {
-      ulLPTimerInterruptFired = true;
-      LPTMR_ClearStatusFlags(vPortGetLptrmBase(), kLPTMR_TimerCompareFlag);
-
-    }
-
-    __attribute__(( weak )) void vPortSuppressTicksAndSleep( TickType_t xExpectedIdleTime )
-    {
-        uint32_t ulReloadValue, ulCompleteTickPeriods;
-        TickType_t xModifiableIdleTime;
-        LPTMR_Type *pxLptmrBase;
-        
-        pxLptmrBase = vPortGetLptrmBase();
-        if (pxLptmrBase == 0) return;
-		/* Make sure the SysTick reload value does not overflow the counter. */
-		if( xExpectedIdleTime > xMaximumPossibleSuppressedTicks )
-		{
-			xExpectedIdleTime = xMaximumPossibleSuppressedTicks;
-		}
-        if (xExpectedIdleTime == 0) return;
-        /* Calculate the reload value required to wait xExpectedIdleTime
-        tick periods.  -1 is used because this code will execute part way
-        through one of the tick periods. */
-        ulReloadValue = LPTMR_GetCurrentTimerCount(pxLptmrBase) + ( ulLPTimerCountsForOneTick * ( xExpectedIdleTime - 1UL ) );
-        if( ulReloadValue > ulStoppedTimerCompensation )
-        {
-            ulReloadValue -= ulStoppedTimerCompensation;
-        }
-
-        /* Stop the LPTMR and systick momentarily.  The time the LPTMR and systick is stopped for
-        is accounted for as best it can be, but using the tickless mode will
-        inevitably result in some tiny drift of the time maintained by the
-        kernel with respect to calendar time. */
-        LPTMR_StopTimer(pxLptmrBase);
-        portNVIC_SYSTICK_CTRL_REG &= ~portNVIC_SYSTICK_ENABLE_BIT;
-
-        /* Enter a critical section but don't use the taskENTER_CRITICAL()
-        method as that will mask interrupts that should exit sleep mode. */
-        __asm volatile( "cpsid i" );
-
-        /* If a context switch is pending or a task is waiting for the scheduler
-        to be unsuspended then abandon the low power entry. */
-        if( eTaskConfirmSleepModeStatus() == eAbortSleep )
-        {
-            /* Restart from whatever is left in the count register to complete
-            this tick period. */
-            portNVIC_SYSTICK_LOAD_REG = portNVIC_SYSTICK_CURRENT_VALUE_REG;
-
-            /* Restart SysTick. */
-            portNVIC_SYSTICK_CTRL_REG |= portNVIC_SYSTICK_ENABLE_BIT;
-
-            /* Reset the reload register to the value required for normal tick
-            periods. */
-            portNVIC_SYSTICK_LOAD_REG = ulTimerCountsForOneTick - 1UL;
-
-            /* Re-enable interrupts - see comments above __disable_interrupt()
-            call above. */
-            __asm volatile( "cpsie i" );
-        }
-        else
-        {
-            /* Set the new reload value. */
-            LPTMR_SetTimerPeriod(pxLptmrBase, ulReloadValue);
-
-            /* Enable LPTMR. */
-            LPTMR_StartTimer(pxLptmrBase);
-
-            /* Sleep until something happens.  configPRE_SLEEP_PROCESSING() can
-            set its parameter to 0 to indicate that its implementation contains
-            its own wait for interrupt or wait for event instruction, and so wfi
-            should not be executed again.  However, the original expected idle
-            time variable must remain unmodified, so a copy is taken. */
-            xModifiableIdleTime = xExpectedIdleTime;
-            configPRE_SLEEP_PROCESSING( xModifiableIdleTime );
-            if( xModifiableIdleTime > 0 )
-            {
-                __asm volatile( "dsb" );
-                __asm volatile( "wfi" );
-                __asm volatile( "isb" );
-            }
-            configPOST_SLEEP_PROCESSING( xExpectedIdleTime );
-
-            ulLPTimerInterruptFired = false;
-            /* Re-enable interrupts - see comments above __disable_interrupt()
-            call above. */
-            __asm volatile( "cpsie i" );
-            __NOP();
-            if( ulLPTimerInterruptFired )
-            {
-
-                /* The tick interrupt handler will already have pended the tick
-                processing in the kernel.  As the pending tick will be
-                processed as soon as this function exits, the tick value
-                maintained by the tick is stepped forward by one less than the
-                time spent waiting. */
-                ulCompleteTickPeriods = xExpectedIdleTime - 1UL;
-                ulLPTimerInterruptFired = false;
-            }
-            else
-            {
-                /* Something other than the tick interrupt ended the sleep.
-                Work out how long the sleep lasted rounded to complete tick
-                periods (not the ulReload value which accounted for part
-                ticks). */
-                ulCompleteTickPeriods = LPTMR_GetCurrentTimerCount(pxLptmrBase);
-
-            }
-
-            /* Stop LPTMR when CPU waked up then set portNVIC_SYSTICK_LOAD_REG back to its standard
-            value.  The critical section is used to ensure the tick interrupt
-            can only execute once in the case that the reload register is near
-            zero. */
-            LPTMR_StopTimer(pxLptmrBase);
-            portENTER_CRITICAL();
-            {
-                portNVIC_SYSTICK_CTRL_REG |= portNVIC_SYSTICK_ENABLE_BIT;
-                vTaskStepTick( ulCompleteTickPeriods );
-                portNVIC_SYSTICK_LOAD_REG = ulTimerCountsForOneTick - 1UL;
-            }
-            portEXIT_CRITICAL();
-        }
-    }
-#else /* configSYSTICK_USE_LOW_POWER_TIMER == 1 */
-    __attribute__(( weak )) void vPortSuppressTicksAndSleep( TickType_t xExpectedIdleTime )
-    {
-    uint32_t ulReloadValue, ulCompleteTickPeriods, ulCompletedSysTickDecrements, ulSysTickCTRL;
-    TickType_t xModifiableIdleTime;
-
-		/* Make sure the SysTick reload value does not overflow the counter. */
-		if( xExpectedIdleTime > xMaximumPossibleSuppressedTicks )
-		{
-			xExpectedIdleTime = xMaximumPossibleSuppressedTicks;
-		}
-        if (xExpectedIdleTime == 0) return;
-		/* Stop the SysTick momentarily.  The time the SysTick is stopped for
-		is accounted for as best it can be, but using the tickless mode will
-		inevitably result in some tiny drift of the time maintained by the
-		kernel with respect to calendar time. */
-		portNVIC_SYSTICK_CTRL_REG &= ~portNVIC_SYSTICK_ENABLE_BIT;
-
-		/* Calculate the reload value required to wait xExpectedIdleTime
-		tick periods.  -1 is used because this code will execute part way
-		through one of the tick periods. */
-		ulReloadValue = portNVIC_SYSTICK_CURRENT_VALUE_REG + ( ulTimerCountsForOneTick * ( xExpectedIdleTime - 1UL ) );
-		if( ulReloadValue > ulStoppedTimerCompensation )
-		{
-			ulReloadValue -= ulStoppedTimerCompensation;
-		}
-
-		/* Enter a critical section but don't use the taskENTER_CRITICAL()
-		method as that will mask interrupts that should exit sleep mode. */
-		__asm volatile( "cpsid i" );
-
-		/* If a context switch is pending or a task is waiting for the scheduler
-		to be unsuspended then abandon the low power entry. */
-		if( eTaskConfirmSleepModeStatus() == eAbortSleep )
-		{
-			/* Restart from whatever is left in the count register to complete
-			this tick period. */
-			portNVIC_SYSTICK_LOAD_REG = portNVIC_SYSTICK_CURRENT_VALUE_REG;
-
-			/* Restart SysTick. */
-			portNVIC_SYSTICK_CTRL_REG |= portNVIC_SYSTICK_ENABLE_BIT;
-
-			/* Reset the reload register to the value required for normal tick
-			periods. */
-			portNVIC_SYSTICK_LOAD_REG = ulTimerCountsForOneTick - 1UL;
-
-			/* Re-enable interrupts - see comments above the cpsid instruction()
-			above. */
-			__asm volatile( "cpsie i" );
-		}
-		else
-		{
-			/* Set the new reload value. */
-			portNVIC_SYSTICK_LOAD_REG = ulReloadValue;
-
-			/* Clear the SysTick count flag and set the count value back to
-			zero. */
-			portNVIC_SYSTICK_CURRENT_VALUE_REG = 0UL;
-
-			/* Restart SysTick. */
-			portNVIC_SYSTICK_CTRL_REG |= portNVIC_SYSTICK_ENABLE_BIT;
-
-			/* Sleep until something happens.  configPRE_SLEEP_PROCESSING() can
-			set its parameter to 0 to indicate that its implementation contains
-			its own wait for interrupt or wait for event instruction, and so wfi
-			should not be executed again.  However, the original expected idle
-			time variable must remain unmodified, so a copy is taken. */
-			xModifiableIdleTime = xExpectedIdleTime;
-			configPRE_SLEEP_PROCESSING( xModifiableIdleTime );
-			if( xModifiableIdleTime > 0 )
-			{
-				__asm volatile( "dsb" );
-				__asm volatile( "wfi" );
-				__asm volatile( "isb" );
-			}
-			configPOST_SLEEP_PROCESSING( xExpectedIdleTime );
-
-			/* Stop SysTick.  Again, the time the SysTick is stopped for is
-			accounted for as best it can be, but using the tickless mode will
-			inevitably result in some tiny drift of the time maintained by the
-			kernel with respect to calendar time. */
-			ulSysTickCTRL = portNVIC_SYSTICK_CTRL_REG;
-			portNVIC_SYSTICK_CTRL_REG = ( ulSysTickCTRL & ~portNVIC_SYSTICK_ENABLE_BIT );
-
-			/* Re-enable interrupts - see comments above the cpsid instruction()
-			above. */
-			__asm volatile( "cpsie i" );
-
-			if( ( ulSysTickCTRL & portNVIC_SYSTICK_COUNT_FLAG_BIT ) != 0 )
-			{
-				uint32_t ulCalculatedLoadValue;
-
-				/* The tick interrupt has already executed, and the SysTick
-				count reloaded with ulReloadValue.  Reset the
-				portNVIC_SYSTICK_LOAD_REG with whatever remains of this tick
-				period. */
-				ulCalculatedLoadValue = ( ulTimerCountsForOneTick - 1UL ) - ( ulReloadValue - portNVIC_SYSTICK_CURRENT_VALUE_REG );
-
-				/* Don't allow a tiny value, or values that have somehow
-				underflowed because the post sleep hook did something
-				that took too long. */
-				if( ( ulCalculatedLoadValue < ulStoppedTimerCompensation ) || ( ulCalculatedLoadValue > ulTimerCountsForOneTick ) )
-				{
-					ulCalculatedLoadValue = ( ulTimerCountsForOneTick - 1UL );
-				}
-
-				portNVIC_SYSTICK_LOAD_REG = ulCalculatedLoadValue;
-
-				/* The tick interrupt handler will already have pended the tick
-				processing in the kernel.  As the pending tick will be
-				processed as soon as this function exits, the tick value
-				maintained by the tick is stepped forward by one less than the
-				time spent waiting. */
-				ulCompleteTickPeriods = xExpectedIdleTime - 1UL;
-			}
-			else
-			{
-				/* Something other than the tick interrupt ended the sleep.
-				Work out how long the sleep lasted rounded to complete tick
-				periods (not the ulReload value which accounted for part
-				ticks). */
-				ulCompletedSysTickDecrements = ( xExpectedIdleTime * ulTimerCountsForOneTick ) - portNVIC_SYSTICK_CURRENT_VALUE_REG;
-
-				/* How many complete tick periods passed while the processor
-				was waiting? */
-				ulCompleteTickPeriods = ulCompletedSysTickDecrements / ulTimerCountsForOneTick;
-
-				/* The reload value is set to whatever fraction of a single tick
-				period remains. */
-				portNVIC_SYSTICK_LOAD_REG = ( ( ulCompleteTickPeriods + 1 ) * ulTimerCountsForOneTick ) - ulCompletedSysTickDecrements;
-			}
-
-			/* Restart SysTick so it runs from portNVIC_SYSTICK_LOAD_REG
-			again, then set portNVIC_SYSTICK_LOAD_REG back to its standard
-			value.  The critical section is used to ensure the tick interrupt
-			can only execute once in the case that the reload register is near
-			zero. */
-			portNVIC_SYSTICK_CURRENT_VALUE_REG = 0UL;
-			portENTER_CRITICAL();
-			{
-				portNVIC_SYSTICK_CTRL_REG |= portNVIC_SYSTICK_ENABLE_BIT;
-				vTaskStepTick( ulCompleteTickPeriods );
-				portNVIC_SYSTICK_LOAD_REG = ulTimerCountsForOneTick - 1UL;
-			}
-			portEXIT_CRITICAL();
-		}
-	}
-#endif/* #if configSYSTICK_USE_LOW_POWER_TIMER */
-#endif /* #if configUSE_TICKLESS_IDLE */
-/*-----------------------------------------------------------*/
-
-/*
- * Setup the systick timer to generate the tick interrupts at the required
- * frequency.
- */
-__attribute__(( weak )) void vPortSetupTimerInterrupt( void )
-{
-    /* Calculate the constants required to configure the tick interrupt. */
-    #if( configUSE_TICKLESS_IDLE == 1 )
-    {
-    #if( configSYSTICK_USE_LOW_POWER_TIMER == 1 )
-        ulTimerCountsForOneTick = ( configSYSTICK_CLOCK_HZ / configTICK_RATE_HZ );
-        ulStoppedTimerCompensation = 0;
-        ulLPTimerCountsForOneTick = configSYSTICK_CLOCK_HZ / configLPTMR_RATE_HZ;
-        xMaximumPossibleSuppressedTicks = portMAX_16_BIT_NUMBER / ulLPTimerCountsForOneTick;
-        NVIC_EnableIRQ(vPortGetLptmrIrqn());
-    #else
-        ulTimerCountsForOneTick = ( configSYSTICK_CLOCK_HZ / configTICK_RATE_HZ );
-        xMaximumPossibleSuppressedTicks = portMAX_24_BIT_NUMBER / ulTimerCountsForOneTick;
-        ulStoppedTimerCompensation = portMISSED_COUNTS_FACTOR / ( configCPU_CLOCK_HZ / configSYSTICK_CLOCK_HZ );
-    #endif
-    }
-    #endif /* configUSE_TICKLESS_IDLE */
-
-	/* Configure SysTick to interrupt at the requested rate. */
-	portNVIC_SYSTICK_LOAD_REG = ( configSYSTICK_CLOCK_HZ / configTICK_RATE_HZ ) - 1UL;
-	portNVIC_SYSTICK_CURRENT_VALUE_REG = 0UL;
-	portNVIC_SYSTICK_CTRL_REG = ( portNVIC_SYSTICK_CLK_BIT | portNVIC_SYSTICK_INT_BIT | portNVIC_SYSTICK_ENABLE_BIT );
-}
-/*-----------------------------------------------------------*/
 
 #if( configASSERT_DEFINED == 1 )
 
@@ -894,3 +458,24 @@ __attribute__(( weak )) void vPortSetupTimerInterrupt( void )
 	}
 
 #endif /* configASSERT_DEFINED */
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/freertos/Source/portable/GCC/ARM_CM3/portmacro.h b/freertos/Source/portable/GCC/ARM_CM3/portmacro.h
index 2aa8472..d44fc92 100644
--- a/freertos/Source/portable/GCC/ARM_CM3/portmacro.h
+++ b/freertos/Source/portable/GCC/ARM_CM3/portmacro.h
@@ -1,5 +1,5 @@
 /*
-    FreeRTOS V8.2.3 - Copyright (C) 2015 Real Time Engineers Ltd.
+    FreeRTOS V9.0.0 - Copyright (C) 2016 Real Time Engineers Ltd.
     All rights reserved
 
     VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
@@ -117,27 +117,34 @@ typedef unsigned long UBaseType_t;
 #define portBYTE_ALIGNMENT			8
 /*-----------------------------------------------------------*/
 
-
 /* Scheduler utilities. */
-extern void vPortYield( void );
+#define portYIELD() 															\
+{																				\
+	/* Set a PendSV to request a context switch. */								\
+	portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT;								\
+																				\
+	/* Barriers are normally not required but do ensure the code is completely	\
+	within the specified behaviour for the architecture. */						\
+	__asm volatile( "dsb" );													\
+	__asm volatile( "isb" );													\
+}
+
 #define portNVIC_INT_CTRL_REG		( * ( ( volatile uint32_t * ) 0xe000ed04 ) )
 #define portNVIC_PENDSVSET_BIT		( 1UL << 28UL )
-#define portYIELD()					vPortYield()
-#define portEND_SWITCHING_ISR( xSwitchRequired ) if( xSwitchRequired ) portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT
+#define portEND_SWITCHING_ISR( xSwitchRequired ) if( xSwitchRequired != pdFALSE ) portYIELD()
 #define portYIELD_FROM_ISR( x ) portEND_SWITCHING_ISR( x )
 /*-----------------------------------------------------------*/
 
 /* Critical section management. */
 extern void vPortEnterCritical( void );
 extern void vPortExitCritical( void );
-extern uint32_t ulPortSetInterruptMask( void );
-extern void vPortClearInterruptMask( uint32_t ulNewMaskValue );
-#define portSET_INTERRUPT_MASK_FROM_ISR()		ulPortSetInterruptMask()
-#define portCLEAR_INTERRUPT_MASK_FROM_ISR(x)	vPortClearInterruptMask(x)
-#define portDISABLE_INTERRUPTS()				ulPortSetInterruptMask()
-#define portENABLE_INTERRUPTS()					vPortClearInterruptMask(0)
+#define portSET_INTERRUPT_MASK_FROM_ISR()		ulPortRaiseBASEPRI()
+#define portCLEAR_INTERRUPT_MASK_FROM_ISR(x)	vPortSetBASEPRI(x)
+#define portDISABLE_INTERRUPTS()				vPortRaiseBASEPRI()
+#define portENABLE_INTERRUPTS()					vPortSetBASEPRI(0)
 #define portENTER_CRITICAL()					vPortEnterCritical()
 #define portEXIT_CRITICAL()						vPortExitCritical()
+
 /*-----------------------------------------------------------*/
 
 /* Task function macros as described on the FreeRTOS.org WEB site.  These are
@@ -181,7 +188,7 @@ not necessary for to use this port.  They are defined so the common demo files
 
 	/*-----------------------------------------------------------*/
 
-	#define portGET_HIGHEST_PRIORITY( uxTopPriority, uxReadyPriorities ) uxTopPriority = ( 31 - ucPortCountLeadingZeros( ( uxReadyPriorities ) ) )
+	#define portGET_HIGHEST_PRIORITY( uxTopPriority, uxReadyPriorities ) uxTopPriority = ( 31UL - ( uint32_t ) ucPortCountLeadingZeros( ( uxReadyPriorities ) ) )
 
 #endif /* configUSE_PORT_OPTIMISED_TASK_SELECTION */
 
@@ -195,6 +202,80 @@ not necessary for to use this port.  They are defined so the common demo files
 /* portNOP() is not required by this port. */
 #define portNOP()
 
+#define portINLINE	__inline
+
+#ifndef portFORCE_INLINE
+	#define portFORCE_INLINE inline __attribute__(( always_inline))
+#endif
+
+portFORCE_INLINE static BaseType_t xPortIsInsideInterrupt( void )
+{
+uint32_t ulCurrentInterrupt;
+BaseType_t xReturn;
+
+	/* Obtain the number of the currently executing interrupt. */
+	__asm volatile( "mrs %0, ipsr" : "=r"( ulCurrentInterrupt ) );
+
+	if( ulCurrentInterrupt == 0 )
+	{
+		xReturn = pdFALSE;
+	}
+	else
+	{
+		xReturn = pdTRUE;
+	}
+
+	return xReturn;
+}
+
+/*-----------------------------------------------------------*/
+
+portFORCE_INLINE static void vPortRaiseBASEPRI( void )
+{
+uint32_t ulNewBASEPRI;
+
+	__asm volatile
+	(
+		"	mov %0, %1												\n"	\
+		"	msr basepri, %0											\n" \
+		"	isb														\n" \
+		"	dsb														\n" \
+		:"=r" (ulNewBASEPRI) : "i" ( configMAX_SYSCALL_INTERRUPT_PRIORITY )
+	);
+}
+
+/*-----------------------------------------------------------*/
+
+portFORCE_INLINE static uint32_t ulPortRaiseBASEPRI( void )
+{
+uint32_t ulOriginalBASEPRI, ulNewBASEPRI;
+
+	__asm volatile
+	(
+		"	mrs %0, basepri											\n" \
+		"	mov %1, %2												\n"	\
+		"	msr basepri, %1											\n" \
+		"	isb														\n" \
+		"	dsb														\n" \
+		:"=r" (ulOriginalBASEPRI), "=r" (ulNewBASEPRI) : "i" ( configMAX_SYSCALL_INTERRUPT_PRIORITY )
+	);
+
+	/* This return will not be reached but is necessary to prevent compiler
+	warnings. */
+	return ulOriginalBASEPRI;
+}
+/*-----------------------------------------------------------*/
+
+portFORCE_INLINE static void vPortSetBASEPRI( uint32_t ulNewMaskValue )
+{
+	__asm volatile
+	(
+		"	msr basepri, %0	" :: "r" ( ulNewMaskValue )
+	);
+}
+/*-----------------------------------------------------------*/
+
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/freertos/Source/portable/MemMang/heap_1.c b/freertos/Source/portable/MemMang/heap_1.c
index 06958d3..6dfb3cb 100644
--- a/freertos/Source/portable/MemMang/heap_1.c
+++ b/freertos/Source/portable/MemMang/heap_1.c
@@ -1,5 +1,5 @@
 /*
-    FreeRTOS V8.2.3 - Copyright (C) 2015 Real Time Engineers Ltd.
+    FreeRTOS V9.0.0 - Copyright (C) 2016 Real Time Engineers Ltd.
     All rights reserved
 
     VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
@@ -87,11 +87,23 @@ task.h is included from an application file. */
 
 #undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE
 
+#if( configSUPPORT_DYNAMIC_ALLOCATION == 0 )
+	#error This file must not be used if configSUPPORT_DYNAMIC_ALLOCATION is 0
+#endif
+
 /* A few bytes might be lost to byte aligning the heap start address. */
 #define configADJUSTED_HEAP_SIZE	( configTOTAL_HEAP_SIZE - portBYTE_ALIGNMENT )
 
 /* Allocate the memory for the heap. */
-static uint8_t ucHeap[ configTOTAL_HEAP_SIZE ];
+/* Allocate the memory for the heap. */
+#if( configAPPLICATION_ALLOCATED_HEAP == 1 )
+	/* The application writer has already defined the array used for the RTOS
+	heap - probably so it can be placed in a special segment or address. */
+	extern uint8_t ucHeap[ configTOTAL_HEAP_SIZE ];
+#else
+	static uint8_t ucHeap[ configTOTAL_HEAP_SIZE ];
+#endif /* configAPPLICATION_ALLOCATED_HEAP */
+
 static size_t xNextFreeByte = ( size_t ) 0;
 
 /*-----------------------------------------------------------*/
@@ -102,12 +114,14 @@ void *pvReturn = NULL;
 static uint8_t *pucAlignedHeap = NULL;
 
 	/* Ensure that blocks are always aligned to the required number of bytes. */
-	#if portBYTE_ALIGNMENT != 1
+	#if( portBYTE_ALIGNMENT != 1 )
+	{
 		if( xWantedSize & portBYTE_ALIGNMENT_MASK )
 		{
 			/* Byte alignment required. */
 			xWantedSize += ( portBYTE_ALIGNMENT - ( xWantedSize & portBYTE_ALIGNMENT_MASK ) );
 		}
+	}
 	#endif
 
 	vTaskSuspendAll();
diff --git a/freertos/Source/portable/MemMang/heap_2.c b/freertos/Source/portable/MemMang/heap_2.c
index 96220e9..bba8554 100644
--- a/freertos/Source/portable/MemMang/heap_2.c
+++ b/freertos/Source/portable/MemMang/heap_2.c
@@ -1,5 +1,5 @@
 /*
-    FreeRTOS V8.2.3 - Copyright (C) 2015 Real Time Engineers Ltd.
+    FreeRTOS V9.0.0 - Copyright (C) 2016 Real Time Engineers Ltd.
     All rights reserved
 
     VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
@@ -88,6 +88,10 @@ task.h is included from an application file. */
 
 #undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE
 
+#if( configSUPPORT_DYNAMIC_ALLOCATION == 0 )
+	#error This file must not be used if configSUPPORT_DYNAMIC_ALLOCATION is 0
+#endif
+
 /* A few bytes might be lost to byte aligning the heap start address. */
 #define configADJUSTED_HEAP_SIZE	( configTOTAL_HEAP_SIZE - portBYTE_ALIGNMENT )
 
@@ -97,7 +101,14 @@ task.h is included from an application file. */
 static void prvHeapInit( void );
 
 /* Allocate the memory for the heap. */
-static uint8_t ucHeap[ configTOTAL_HEAP_SIZE ];
+#if( configAPPLICATION_ALLOCATED_HEAP == 1 )
+	/* The application writer has already defined the array used for the RTOS
+	heap - probably so it can be placed in a special segment or address. */
+	extern uint8_t ucHeap[ configTOTAL_HEAP_SIZE ];
+#else
+	static uint8_t ucHeap[ configTOTAL_HEAP_SIZE ];
+#endif /* configAPPLICATION_ALLOCATED_HEAP */
+
 
 /* Define the linked list structure.  This is used to link free blocks in order
 of their size. */
@@ -127,7 +138,7 @@ static size_t xFreeBytesRemaining = configADJUSTED_HEAP_SIZE;
  */
 #define prvInsertBlockIntoFreeList( pxBlockToInsert )								\
 {																					\
-BlockLink_t *pxIterator;																\
+BlockLink_t *pxIterator;															\
 size_t xBlockSize;																	\
 																					\
 	xBlockSize = pxBlockToInsert->xBlockSize;										\
diff --git a/freertos/Source/portable/MemMang/heap_3.c b/freertos/Source/portable/MemMang/heap_3.c
index da85a58..f922001 100644
--- a/freertos/Source/portable/MemMang/heap_3.c
+++ b/freertos/Source/portable/MemMang/heap_3.c
@@ -1,5 +1,5 @@
 /*
-    FreeRTOS V8.2.3 - Copyright (C) 2015 Real Time Engineers Ltd.
+    FreeRTOS V9.0.0 - Copyright (C) 2016 Real Time Engineers Ltd.
     All rights reserved
 
     VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
@@ -91,6 +91,10 @@ task.h is included from an application file. */
 
 #undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE
 
+#if( configSUPPORT_DYNAMIC_ALLOCATION == 0 )
+	#error This file must not be used if configSUPPORT_DYNAMIC_ALLOCATION is 0
+#endif
+
 /*-----------------------------------------------------------*/
 
 void *pvPortMalloc( size_t xWantedSize )
diff --git a/freertos/Source/portable/MemMang/heap_4.c b/freertos/Source/portable/MemMang/heap_4.c
index 97855c4..e7c7ade 100644
--- a/freertos/Source/portable/MemMang/heap_4.c
+++ b/freertos/Source/portable/MemMang/heap_4.c
@@ -1,5 +1,5 @@
 /*
-    FreeRTOS V8.2.3 - Copyright (C) 2015 Real Time Engineers Ltd.
+    FreeRTOS V9.0.0 - Copyright (C) 2016 Real Time Engineers Ltd.
     All rights reserved
 
     VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
@@ -87,6 +87,10 @@ task.h is included from an application file. */
 
 #undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE
 
+#if( configSUPPORT_DYNAMIC_ALLOCATION == 0 )
+	#error This file must not be used if configSUPPORT_DYNAMIC_ALLOCATION is 0
+#endif
+
 /* Block sizes must not get too small. */
 #define heapMINIMUM_BLOCK_SIZE	( ( size_t ) ( xHeapStructSize << 1 ) )
 
@@ -293,7 +297,7 @@ void *pvReturn = NULL;
 	}
 	#endif
 
-	configASSERT( ( ( ( uint32_t ) pvReturn ) & portBYTE_ALIGNMENT_MASK ) == 0 );
+	configASSERT( ( ( ( size_t ) pvReturn ) & ( size_t ) portBYTE_ALIGNMENT_MASK ) == 0 );
 	return pvReturn;
 }
 /*-----------------------------------------------------------*/
diff --git a/freertos/Source/portable/MemMang/heap_5.c b/freertos/Source/portable/MemMang/heap_5.c
index 9d92021..d53e41e 100644
--- a/freertos/Source/portable/MemMang/heap_5.c
+++ b/freertos/Source/portable/MemMang/heap_5.c
@@ -1,5 +1,5 @@
 /*
-    FreeRTOS V8.2.3 - Copyright (C) 2015 Real Time Engineers Ltd.
+    FreeRTOS V9.0.0 - Copyright (C) 2016 Real Time Engineers Ltd.
     All rights reserved
 
     VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
@@ -121,6 +121,10 @@ task.h is included from an application file. */
 
 #undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE
 
+#if( configSUPPORT_DYNAMIC_ALLOCATION == 0 )
+	#error This file must not be used if configSUPPORT_DYNAMIC_ALLOCATION is 0
+#endif
+
 /* Block sizes must not get too small. */
 #define heapMINIMUM_BLOCK_SIZE	( ( size_t ) ( xHeapStructSize << 1 ) )
 
diff --git a/freertos/Source/portable/readme.txt b/freertos/Source/portable/readme.txt
new file mode 100644
index 0000000..43e7c1d
--- /dev/null
+++ b/freertos/Source/portable/readme.txt
@@ -0,0 +1,19 @@
+Each real time kernel port consists of three files that contain the core kernel
+components and are common to every port, and one or more files that are 
+specific to a particular microcontroller and/or compiler.
+
+
++ The FreeRTOS/Source/Portable/MemMang directory contains the three sample 
+memory allocators as described on the http://www.FreeRTOS.org WEB site.
+
++ The other directories each contain files specific to a particular 
+microcontroller or compiler.
+
+
+
+For example, if you are interested in the GCC port for the ATMega323 
+microcontroller then the port specific files are contained in
+FreeRTOS/Source/Portable/GCC/ATMega323 directory.  If this is the only
+port you are interested in then all the other directories can be
+ignored.
+