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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 <stdint.h>
#include <stdbool.h>
#include "uart_imx.h"
#include "board.h"
typedef struct _uart_state {
const uint8_t* txBuff; /*!< The buffer of data being sent.*/
uint8_t* rxBuff; /*!< The buffer of received data. */
volatile uint32_t txSize; /*!< The remaining number of bytes to be transmitted. */
volatile uint32_t rxSize; /*!< The remaining number of bytes to be received. */
volatile bool isTxBusy; /*!< True if there is an active transmit. */
volatile bool isRxBusy; /*!< True if there is an active receive. */
} uart_state_t;
const uint8_t buffStart[] = "\n\r++++++++++++++++ UART Send/Receive Interrupt Driven Example +++++++++++++++++\n\r";
const uint8_t bufferData[] = "\n\rType characters from keyboard, the board will receive and then echo them to terminal screen\n\r";
/* Uart runtime state structure */
static uart_state_t uartState;
static void UART_XFER_Config(uart_init_config_t* initConfig);
static bool UART_XFER_Write(uint8_t* txBuffer, uint32_t length);
static uint32_t UART_XFER_GetWriteStatus(void);
static bool UART_XFER_Read(uint8_t* rxBuffer, uint32_t length);
static uint32_t UART_XFER_GetReadStatus(void);
int main(void)
{
// Setup UART init structure.
uart_init_config_t initConfig = {
.baudRate = 115200u,
.wordLength = uartWordLength8Bits,
.stopBitNum = uartStopBitNumOne,
.parity = uartParityDisable,
.direction = uartDirectionTxRx
};
uint8_t rxChar, txChar;
// Initialize board specified hardware.
hardware_init();
// Get current module clock frequency.
initConfig.clockRate = get_uart_clock_freq(BOARD_DEBUG_UART_BASEADDR);
// Initialize the uart module with initialize structure.
UART_XFER_Config(&initConfig);
// Inform to start non blocking example.
UART_XFER_Write((uint8_t*)buffStart, sizeof(buffStart));
// Wait until transmission is finished.
while (UART_XFER_GetWriteStatus());
// Inform user of what to do
UART_XFER_Write((uint8_t*)bufferData, sizeof(bufferData));
// Wait until transmission is finished.
while (UART_XFER_GetWriteStatus());
while (true)
{
// Call received API
UART_XFER_Read(&rxChar, 1u);
// Wait until we receive a character
while (UART_XFER_GetReadStatus());
// Echo received character
txChar = rxChar;
UART_XFER_Write(&txChar, 1u);
}
}
static void UART_XFER_Config(uart_init_config_t* initConfig)
{
/* Assert */
/* Initialize UART state structure content. */
uartState.txBuff = 0;
uartState.rxBuff = 0;
uartState.txSize = 0;
uartState.rxSize = 0;
uartState.isTxBusy = false;
uartState.isRxBusy = false;
/* Initialize UART baud rate, bit count, parity, stop bit and direction. */
UART_Init(BOARD_DEBUG_UART_BASEADDR, initConfig);
UART_SetTxFifoWatermark(BOARD_DEBUG_UART_BASEADDR, 16);
UART_SetRxFifoWatermark(BOARD_DEBUG_UART_BASEADDR, 1);
/* Set UART Interrupt priority */
NVIC_SetPriority(BOARD_DEBUG_UART_IRQ_NUM, 3);
/* Call core API to enable the IRQ. */
NVIC_EnableIRQ(BOARD_DEBUG_UART_IRQ_NUM);
/* Finally, enable the UART module */
UART_Enable(BOARD_DEBUG_UART_BASEADDR);
}
static bool UART_XFER_Write(uint8_t* txBuffer, uint32_t length)
{
if ((uartState.isTxBusy) || (0 == length))
return false;
uartState.txBuff = txBuffer;
uartState.txSize = length;
uartState.isTxBusy = true;
UART_SetIntCmd(BOARD_DEBUG_UART_BASEADDR, uartIntTxReady, true);
return true;
}
static uint32_t UART_XFER_GetWriteStatus(void)
{
return uartState.txSize;
}
static bool UART_XFER_Read(uint8_t* rxBuffer, uint32_t length)
{
if ((uartState.isRxBusy) || (0 == length))
return false;
uartState.rxBuff = rxBuffer;
uartState.rxSize = length;
uartState.isRxBusy = true;
UART_SetIntCmd(BOARD_DEBUG_UART_BASEADDR, uartIntRxReady, true);
return true;
}
static uint32_t UART_XFER_GetReadStatus(void)
{
return uartState.rxSize;
}
void BOARD_DEBUG_UART_HANDLER(void)
{
/* Exit the ISR if no transfer is happening for this instance. */
if ((!uartState.isTxBusy) && (!uartState.isRxBusy))
return;
if (UART_GetStatusFlag(BOARD_DEBUG_UART_BASEADDR, uartStatusRxReady))
{
/* Check to see if there are any more bytes to receive. */
if (uartState.rxSize)
{
while (UART_GetStatusFlag(BOARD_DEBUG_UART_BASEADDR, uartStatusRxReady))
{
*(uartState.rxBuff) = (uint8_t)UART_Getchar(BOARD_DEBUG_UART_BASEADDR);
uartState.rxBuff++;
uartState.rxSize--;
if (uartState.rxSize == 0U)
{
UART_SetIntCmd(BOARD_DEBUG_UART_BASEADDR, uartIntRxReady, false);
uartState.isRxBusy = false;
break;
}
}
}
}
if (UART_GetStatusFlag(BOARD_DEBUG_UART_BASEADDR, uartStatusTxReady))
{
/* Check to see if there are any more bytes to send. */
if (uartState.txSize)
{
while (UART_GetStatusFlag(BOARD_DEBUG_UART_BASEADDR, uartStatusTxReady))
{
/* Transmit data and update tx size/buff */
UART_Putchar(BOARD_DEBUG_UART_BASEADDR, *(uartState.txBuff));
uartState.txBuff++;
uartState.txSize--;
if (uartState.txSize == 0U)
{
/* Transmit complete */
/* Disable the transmitter ready interrupt */
UART_SetIntCmd(BOARD_DEBUG_UART_BASEADDR, uartIntTxReady, false);
/* Update the information of the module driver state */
uartState.isTxBusy = false;
break;
}
}
}
}
}
/*******************************************************************************
* EOF
******************************************************************************/
|
