10 我这个UART代码为什么无法实现数据的传输？

发布于 2024-03-14 17:28:29 浏览：479 订阅该版

![IMG_5561.JPG](https://oss-club.rt-thread.org/uploads/20240314/57c494abaab7ef3c19feb886f968b097.jpg.webp)

![IMG_5562.JPG](https://oss-club.rt-thread.org/uploads/20240314/1eb53142d5f0f804255a14d5081a118b.jpg.webp)

K210的代码：

```c
#include <rtthread.h>
#include <rtdevice.h>

#define SAMPLE_UART_NAME "uart2"

static struct rt_semaphore rx_sem;
static rt_device_t serial;
static char toggle = 0;

static rt_err_t uart_input(rt_device_t dev, rt_size_t size)
{
    rt_sem_release(&rx_sem);
    return RT_EOK;
}

static void serial_thread_entry(void *parameter)
{
    char ch;

while (1)
    {
        while (rt_device_read(serial, -1, &ch, 1) != 1)
        {
            rt_sem_take(&rx_sem, RT_WAITING_FOREVER);
        }
        ch = toggle ? '0' : '1';
        rt_device_write(serial, 0, &ch, 1);
        toggle = !toggle;
    }
}

static int uart_sample(int argc, char *argv[])
{
    rt_err_t ret = RT_EOK;
    char uart_name[RT_NAME_MAX];
    char str[] = "UART demo started.\r\n";

if (argc == 2)
    {
        rt_strncpy(uart_name, argv[1], RT_NAME_MAX);
    }
    else
    {
        rt_strncpy(uart_name, SAMPLE_UART_NAME, RT_NAME_MAX);
    }

serial = rt_device_find(uart_name);
    if (!serial)
    {
        rt_kprintf("find %s failed!\n", uart_name);
        return RT_ERROR;
    }

struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
    config.baud_rate = BAUD_RATE_9600;
    rt_device_control(serial, RT_DEVICE_CTRL_CONFIG, &config);

rt_sem_init(&rx_sem, "rx_sem", 0, RT_IPC_FLAG_FIFO);
    rt_device_open(serial, RT_DEVICE_FLAG_INT_RX);
    rt_device_set_rx_indicate(serial, uart_input);
    rt_device_write(serial, 0, str, (sizeof(str) - 1));

rt_thread_t thread = rt_thread_create("serial", serial_thread_entry, RT_NULL, 1024, 25, 10);
    if (thread != RT_NULL)
    {
        rt_thread_startup(thread);
    }
    else
    {
        ret = RT_ERROR;
    }

return ret;
}

MSH_CMD_EXPORT(uart_sample, uart device sample);

int main(void)
{

char *uart_args[] = {"uart_sample", SAMPLE_UART_NAME};
    uart_sample(2, uart_args);

return 0;
}

Arduino的代码：#include <DHT.h>

#define DHTPIN 22
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial3.begin(9600);
  Serial.begin(9600); 
  Serial.println("Arduino Ready");
  dht.begin();
}

void loop() {
  delay(2000);

float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  while (Serial1.available() > 0) {
    String messageFromK210 = Serial1.readStringUntil('\n'); 
    Serial.print("Message from K210: ");
    Serial.println(messageFromK210); 
  }

Serial3.print(temperature);
  Serial3.print(' ');
  Serial3.println(humidity);
  Serial.print(temperature);
  Serial.print('\n');
  Serial.print(humidity);
  Serial.print('\n');
}
```