uart_read 读取不到数据?

只看该作者 · 2020-10-21 20:38

我使用CC3220SF中ti驱动uartecho例程。自己修改了sysconfig中uart驱动的Rx和Tx引脚。然后我创建了Txbuf和Rxbuf两个缓冲区，并用杜邦线把RX引脚与Tx引脚相连。以此实现自发自收的目的。

1.我使用uart_write()发送数据给Rx引脚，发现uart_read的始终不能读取到数据？

代码如下：

/*
*  ======== uartecho.c ========
*/
#include <stdint.h>
#include <stddef.h>

/* Driver Header files */
#include <ti/drivers/GPIO.h>
#include "UART.h"

/* Driver configuration */
#include "ti_drivers_config.h"
#include "unistd.h"
/*
*  ======== mainThread ========
*/
void *mainThread(void *arg0)
{
UART_Handle uart;
UART_Handle uart1;
UART_Params uartParams;
uint8_t TX_data[8] = {0x01,0x03,0x00,0x64,0x00,0x01,0xc5,0xd5};
uint8_t RX_data[8] = {0};
uint8_t count = 0;
/* Call driver init functions */
GPIO_init();
UART_init();

/* Configure the LED pin */
GPIO_setConfig(CONFIG_GPIO_LED_0, GPIO_CFG_OUT_STD | GPIO_CFG_OUT_LOW);

/* Turn on user LED */
GPIO_write(CONFIG_GPIO_LED_0, CONFIG_GPIO_LED_ON);

/* Create a UART with data processing off. */
   UART_Params_init(&uartParams);
   uartParams.readMode = UART_MODE_BLOCKING;
   uartParams.writeMode = UART_MODE_BLOCKING;
//    uartParams.writeTimeout = 1000;
   uartParams.writeDataMode = UART_DATA_BINARY;
   uartParams.readDataMode = UART_DATA_BINARY;
   uartParams.readReturnMode = UART_RETURN_FULL;
   uartParams.readTimeout = 1000;
   uartParams.baudRate = 9600;
   uartParams.dataLength = UART_LEN_8;
   uartParams.stopBits = UART_STOP_ONE;
   uartParams.parityType = UART_PAR_NONE;
   uartParams.readEcho = UART_ECHO_OFF;
uart = UART_open(CONFIG_UART_0, &uartParams);

if (uart == NULL) {
      /* UART_open() failed */
      while (1);
}

uart1 = UART_open(CONFIG_UART_1, &uartParams);
if (uart1 == NULL) {
         /* UART_open() failed */
         while (1);
   }

/* Loop forever echoing */
while (1) {
      UART_write(uart1, TX_data, 8);
      count =  UART_read(uart1, RX_data, 8);
      if(count > 0)
      {
         GPIO_toggle(CONFIG_GPIO_LED_0);
      }
}
}