Bearpi开发板HarmonyOS之UART读写_harmonyos串口读写

wifiiot_uart.h中包含声明UART接口函数

• 初始化UART
  unsigned int UartInit(WifiIotUartIdx id, const WifiIotUartAttribute *param, const WifiIotUartExtraAttr *extraAttr);
• 取消UART初始化
  unsigned int UartDeinit(WifiIotUartIdx id);
• 从UART读取数据
  int UartRead(WifiIotUartIdx id, unsigned char *data, unsigned int dataLen);
• 将数据写入UART
  int UartWrite(WifiIotUartIdx id, const unsigned char *data, unsigned int dataLen);
• 设置UART流控制
  unsigned int UartSetFlowCtrl(WifiIotUartIdx id, WifiIotFlowCtrl flowCtrl);

uart读写测试代码，需要将GPIO5和GPIO6短接进行uart数据自发自收。

#include <stdio.h>
#include <unistd.h>
#include "ohos_init.h"
#include <string.h>
#include "cmsis_os2.h"
#include "wifiiot_gpio.h"
#include "wifiiot_gpio_ex.h"
#include "wifiiot_adc.h"
#include "wifiiot_errno.h"
#include "wifiiot_uart.h"

static const char *data = "Hello, BearPi!\r\n";
#define UART_BUFF_SIZE 1024

static void uart_task(void)
{
  uint8_t uart_buffer[UART_BUFF_SIZE] = {0};
  uint8_t *pData = uart_buffer;
  uint32_t ret;
  WifiIotUartAttribute attr = {
    .baudRate = 115200,
    .dataBits = 8,
    .stopBits = 1,
    .parity = 0,
    .pad = 0,
  };

  ret = UartInit(WIFI_IOT_UART_IDX_1,&attr,NULL);
  if(ret != WIFI_IOT_SUCCESS)
  {
    printf("Failed to init uart! Err code = %d\n", ret);
    return;
  }
   printf("UART Test Start\n");
  while(1)
  {
      UartWrite(WIFI_IOT_UART_IDX_1,(uint8_t *)data,strlen(data));

      UartRead(WIFI_IOT_UART_IDX_1,pData,UART_BUFF_SIZE);
      printf("read data from uart1============>\r\n %s",pData);

      osDelay(100);
  }

}

static void my_led_example(void)
{
   
    
     osThreadAttr_t attr;
     attr.attr_bits = 0;
     attr.name = "uart";
     attr.cb_mem = NULL;
     attr.cb_size = 0;
     attr.priority = 24;
     attr.stack_size = 1024*8;

     if(osThreadNew((osThreadFunc_t)uart_task,NULL,&attr) == NULL)
     {
        printf("Falied to create adc_func!\n");
    }
}

SYS_RUN(my_led_example);
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• 运行效果