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/*
* Copyright (c) 2015, Freescale Semiconductor, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* o Redistributions of source code must retain the above copyright notice, this list
* of conditions and the following disclaimer.
*
* o Redistributions in binary form must reproduce the above copyright notice, this
* list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution.
*
* o Neither the name of Freescale Semiconductor, Inc. nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "gpio_imx.h"
/*******************************************************************************
* Code
******************************************************************************/
/*******************************************************************************
* GPIO Initialization and Configuration functions
******************************************************************************/
/*FUNCTION**********************************************************************
*
* Function Name : GPIO_Init
* Description : Initializes the GPIO module according to the specified
* parameters in the initConfig.
*
*END**************************************************************************/
void GPIO_Init(GPIO_Type* base, const gpio_init_config_t* initConfig)
{
uint32_t pin;
volatile uint32_t *icr;
/* Register reset to default value */
GPIO_IMR_REG(base) = 0;
GPIO_EDGE_SEL_REG(base) = 0;
/* Get pin number */
pin = initConfig->pin;
/* Configure GPIO pin direction */
if (initConfig->direction == gpioDigitalOutput)
GPIO_GDIR_REG(base) |= (1U << pin);
else
GPIO_GDIR_REG(base) &= ~(1U << pin);
/* Configure GPIO pin interrupt mode */
if(pin < 16)
icr = &GPIO_ICR1_REG(base);
else
{
icr = &GPIO_ICR2_REG(base);
pin -= 16;
}
switch(initConfig->interruptMode)
{
case(gpioIntLowLevel):
{
*icr &= ~(0x3<<(2*pin));
break;
}
case(gpioIntHighLevel):
{
*icr = (*icr & (~(0x3<<(2*pin)))) | (0x1<<(2*pin));
break;
}
case(gpioIntRisingEdge):
{
*icr = (*icr & (~(0x3<<(2*pin)))) | (0x2<<(2*pin));
break;
}
case(gpioIntFallingEdge):
{
*icr |= (0x3<<(2*pin));
break;
}
case(gpioNoIntmode):
{
break;
}
}
}
/*******************************************************************************
* GPIO Read and Write Functions
******************************************************************************/
/*FUNCTION**********************************************************************
*
* Function Name : GPIO_WritePinOutput
* Description : Sets the output level of the individual GPIO pin.
*
*END**************************************************************************/
void GPIO_WritePinOutput(GPIO_Type* base, uint32_t pin, gpio_pin_action_t pinVal)
{
assert(pin < 32);
if (pinVal == gpioPinSet)
{
GPIO_DR_REG(base) |= (1U << pin); /* Set pin output to high level.*/
}
else
{
GPIO_DR_REG(base) &= ~(1U << pin); /* Set pin output to low level.*/
}
}
/*******************************************************************************
* Interrupts and flags management functions
******************************************************************************/
/*FUNCTION**********************************************************************
*
* Function Name : GPIO_SetPinIntMode
* Description : Enable or Disable the specific pin interrupt.
*
*END**************************************************************************/
void GPIO_SetPinIntMode(GPIO_Type* base, uint32_t pin, bool enable)
{
assert(pin < 32);
if(enable)
GPIO_IMR_REG(base) |= (1U << pin);
else
GPIO_IMR_REG(base) &= ~(1U << pin);
}
/*FUNCTION**********************************************************************
*
* Function Name : GPIO_SetIntEdgeSelect
* Description : Enable or Disable the specific pin interrupt.
*
*END**************************************************************************/
void GPIO_SetIntEdgeSelect(GPIO_Type* base, uint32_t pin, bool enable)
{
assert(pin < 32);
if(enable)
GPIO_EDGE_SEL_REG(base) |= (1U << pin);
else
GPIO_EDGE_SEL_REG(base) &= ~(1U << pin);
}
/*******************************************************************************
* EOF
******************************************************************************/
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