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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 <stdio.h>
#include "board.h"
#include "uart_imx.h"
#include "debug_console_imx.h"
#include "ecspi.h"
/* define ECSPI slave mode burst length */
#define ECSPI_SLAVE_BURSTLENGTH (7)
#define FIRST_DATA 0xFF
/* ECSPI module slave mode configure */
static void ECSPI_SlaveConfig(ecspi_init_t* initConfig);
/* ECSPI slave mode transfer Status */
static bool ECSPI_SlaveGetTransferStatus(void);
static volatile uint8_t txData;
static volatile uint8_t rxData;
static uint8_t txBuffer[20];
static uint8_t rxBuffer[20];
static volatile bool isBusy;
int main(void)
{
uint8_t i;
ecspi_init_t ecspiSlaveInitConfig = {
.clockRate = 0,
.baudRate = 0,
.mode = ecspiSlaveMode,
.burstLength = ECSPI_SLAVE_BURSTLENGTH,
.channelSelect = BOARD_ECSPI_SLAVE_CHANNEL,
.clockPhase = ecspiClockPhaseSecondEdge,
.clockPolarity = ecspiClockPolarityActiveHigh,
.ecspiAutoStart = 0
};
/* Hardware initialiize, include RDC, CLOCK, IOMUX, ENABLE MODULE */
hardware_init();
PRINTF("\n-------------- ECSPI slave driver example --------------\n\n\r");
PRINTF("This example application demonstrates usage of ECSPI slave driver.\n\r");
PRINTF("It responding to master via SPI bus.\n\n\r");
/* Ecspi slave initialize, include configure parameters */
txData = FIRST_DATA;
ECSPI_SlaveConfig(&ecspiSlaveInitConfig);
PRINTF("SLAVE: Initial transmit data: %d\n\n\r", txData);
/* Send data to master and receive data from master */
txData = 0;
for(i = 0; i < 20; i++)
{
/* Wait for transfer */
while(ECSPI_SlaveGetTransferStatus());
txBuffer[i] = txData;
rxBuffer[i] = rxData;
txData = txData + 1;
/* Set transfer status */
isBusy = true;
}
for(i = 0; i < 20; i++)
{
PRINTF("SLAVE: Next step transmit data: %d\n\r", txBuffer[i]);
PRINTF(" : Currently received data: %d\n\n\r", rxBuffer[i]);
}
/* Disable ecspi slave module */
ECSPI_Disable(BOARD_ECSPI_SLAVE_BASEADDR);
while(1);
}
/******************************************************************************
*
* Function Name: ECSPI_SlaveGetTransferStatus
* Comments: Get Slave transfer status.
*
******************************************************************************/
static bool ECSPI_SlaveGetTransferStatus(void)
{
return isBusy;
}
/******************************************************************************
*
* Function Name: ECSPI_SlaveConfig
* Comments: ECSPI slave initialize
*
******************************************************************************/
static void ECSPI_SlaveConfig(ecspi_init_t* initConfig)
{
/* Initialize ECSPI, parameter configure */
ECSPI_Init(BOARD_ECSPI_SLAVE_BASEADDR, initConfig);
/* Move first data to tx data register to be ready for first transmition. */
ECSPI_SendData(BOARD_ECSPI_SLAVE_BASEADDR, txData);
/* Call core API to enable the IRQ. */
NVIC_EnableIRQ(BOARD_ECSPI_SLAVE_IRQ_NUM);
/* Clear ECSPI status register */
ECSPI_ClearStatusFlag(BOARD_ECSPI_SLAVE_BASEADDR, ecspiFlagTxfifoTc);
ECSPI_ClearStatusFlag(BOARD_ECSPI_SLAVE_BASEADDR, ecspiFlagRxfifoOverflow);
/* Enable RXFIFO Ready Interrupt.*/
ECSPI_SetIntCmd(BOARD_ECSPI_SLAVE_BASEADDR, ecspiFlagRxfifoReady, true);
/* Set ECSPI transfer state. */
isBusy = true;
}
/******************************************************************************
*
* Function Name : BOARD_ECSPI_SLAVE_HANDLER
* Returned Value : none
* Comments :
* ECSPI slave IRQ handler.
* Copy txData to tx data register (will be send in next step) and received
* data to rxData.
*
******************************************************************************/
void BOARD_ECSPI_SLAVE_HANDLER(void)
{
/* Are one word or more in RX FIFO */
if(ECSPI_GetStatusFlag(BOARD_ECSPI_SLAVE_BASEADDR, ecspiFlagRxfifoReady) != 0)
{
/* Read byte from rx data register */
rxData = ECSPI_ReceiveData(BOARD_ECSPI_SLAVE_BASEADDR);
/* Store tx data to tx data register for next transmition */
ECSPI_SendData(BOARD_ECSPI_SLAVE_BASEADDR, txData);
/* Clear the status */
ECSPI_ClearStatusFlag(BOARD_ECSPI_SLAVE_BASEADDR, ecspiFlagTxfifoTc);
ECSPI_ClearStatusFlag(BOARD_ECSPI_SLAVE_BASEADDR, ecspiFlagRxfifoOverflow);
/* Set transfer status */
isBusy = false;
}
}
/*******************************************************************************
* EOF
******************************************************************************/
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