UART

khalid11 — Thu, 07 Mar 2024 11:14:17 GMT

#include "pin_mux.h"

#include "board.h"

#include "fsl_usart.h"

#include <stdbool.h>

#include <stdio.h>

#include <string.h>

/* Definitions */

#define EXAMPLE_USART USART0

#define EXAMPLE_USART_CLK_SRC kCLOCK_MainClk

#define EXAMPLE_USART_CLK_FREQ CLOCK_GetFreq(EXAMPLE_USART_CLK_SRC)

#define RX_RING_BUFFER_SIZE 8U

#define ECHO_BUFFER_SIZE 1024U

/* Prototypes */

static void EXAMPLE_USARTUserCallback(USART_Type *base, usart_handle_t *handle, status_t status, void *userData);

static void EXAMPLE_USARTInit(void);

static void EXAMPLE_USARTPrepareTransfer(void);

/* Variables */

usart_handle_t g_uartHandle;

uint8_t g_tipString[] = "USART RX ring buffer example.\r\nSend back received data.\r\nEcho every 8 bytes.\r\n";

uint8_t g_rxRingBuffer[RX_RING_BUFFER_SIZE] = {0}; /* RX ring buffer. */

uint8_t rxBuffer[ECHO_BUFFER_SIZE] = {0}; /* Buffer for receive data to echo. */

uint8_t txBuffer[ECHO_BUFFER_SIZE] = {0}; /* Buffer for send data to echo. */

volatile bool rxBufferEmpty = true;

volatile bool txBufferFull = false;

volatile bool txOnGoing = false;

volatile bool rxOnGoing = false;

usart_transfer_t sendXfer;

usart_transfer_t receiveXfer;

/* USART user callback */

void EXAMPLE_USARTUserCallback(USART_Type *base, usart_handle_t *handle, status_t status, void *userData)

{

userData = userData;

if (kStatus_USART_TxIdle == status)

{

txBufferFull = false;

txOnGoing = false;

}

if (kStatus_USART_RxIdle == status)

{

rxBufferEmpty = false;

rxOnGoing = false;

}

void transmitData()

{

// Fill rxBuffer with 'A'

for (int i = 0; i < ECHO_BUFFER_SIZE; ++i) {

txBuffer[i] = 'A';

}

/*void receivedata()

{

for (int i = 0; i < ECHO_BUFFER_SIZE; ++i) {

rxBuffer[i] = 'A';

}

}*/

/*!

* @brief Main function

int main(void)

{

size_t receivedBytes;

/* Initialize the hardware. */

BOARD_InitBootPins();

BOARD_InitBootClocks();

CLOCK_Select(kUART0_Clk_From_MainClk);

/* Initialize the USART instance. */

EXAMPLE_USARTInit();

/* Prepare for transactional transmission. */

EXAMPLE_USARTPrepareTransfer();

/* Send tip information. */

txOnGoing = true;

USART_TransferSendNonBlocking(EXAMPLE_USART, &g_uartHandle, &sendXfer);

transmitData();

/* Wait for transmission to complete. */

while (txOnGoing)

{

}

while (1)

{

/* If txBuffer is empty and rxBuffer is full, copy rxBuffer to txBuffer. */

if ((!rxBufferEmpty) && (!txBufferFull))

{

memcpy(txBuffer, rxBuffer, ECHO_BUFFER_SIZE);

rxBufferEmpty = true;

txBufferFull = true;

}

/* If RX is idle and rxBuffer is empty, start to read data to rxBuffer. */

if ((!rxOnGoing) && rxBufferEmpty)

{

rxOnGoing = true;

USART_ReadByte(EXAMPLE_USART);

receivedata();

if (ECHO_BUFFER_SIZE == receivedBytes)

{

rxBufferEmpty = false;

rxOnGoing = false;

}

/* If TX is idle and txBuffer is full, start to send data. */

if ((!txOnGoing) && txBufferFull)

{

txOnGoing = true;

USART_TransferSendNonBlocking(EXAMPLE_USART, &g_uartHandle, &sendXfer);

transmitData();

}

static void EXAMPLE_USARTInit(void)

{

usart_config_t config;

USART_GetDefaultConfig(&config);

config.baudRate_Bps = BOARD_DEBUG_USART_BAUDRATE;

config.enableRx = true;

config.enableTx = true;

USART_Init(EXAMPLE_USART, &config, EXAMPLE_USART_CLK_FREQ);

}

static void EXAMPLE_USARTPrepareTransfer(void)

{

/* Create USART handle and install callback function. */

USART_TransferCreateHandle(EXAMPLE_USART, &g_uartHandle, EXAMPLE_USARTUserCallback, NULL);

/* Start ring buffer. */

USART_TransferStartRingBuffer(EXAMPLE_USART, &g_uartHandle, g_rxRingBuffer, RX_RING_BUFFER_SIZE);

/* Prepare transfer for sending the received characters. */

sendXfer.data = txBuffer;

sendXfer.dataSize = ECHO_BUFFER_SIZE;

/* Prepare transfer for receiving characters. */

receiveXfer.data = rxBuffer;

receiveXfer.dataSize = ECHO_BUFFER_SIZE;

}

I AM USING LPC804

USING THIS CODE I AM TRYING TO SEND THE CONTINEOUS DATA AND I WANT TO RECEIVE THE SAME TRANSMITTED DATA IN rxBUFFER. HERE I AM TRANSMITTIND DATA 'A' CONTINEOUSLY AND I WANT RECEIVE THE SAME DATA IN rxBUFFER THAT TOO CONTINEOUSLY. IT WILL BE GREAT IF I GET PROPER CODE AND METHOD .

THANK YOU

Re: UART

Pavel_Hernandez — Fri, 08 Mar 2024 20:13:25 GMT

Hello, my name is Pavel, and I will be supporting your case, I recommend review the available examples on the SDK, if the issue persist, please let me know.

Select Board | MCUXpresso SDK Builder (nxp.com)

Best regards,
Pavel

LPC MicrocontrollersのトピックUART

UART

Re: UART