关于rtt-studio下的串口和GPIO

发布于 2020-04-22 09:15:40 浏览：1563 订阅该版

我使用rtt-studio基于芯片创建了工程,按照官网给的例子控制uart和GPIO，代码如下**Uart部分代码:**

```rt_err_t uart3_input(rt_device_t dev, rt_size_t size)
{
 /* 串口接收到数据后产生中断，调用此回调函数，然后发送接收信号量 */
 if (size > 0)
 {
 rt_kprintf("uart3:msg is coming ");
 rt_sem_release(&rx3_sem);
 }
 return RT_EOK;
}
char uart3_recieve(void)
{
 char ch;

while (rt_device_read(serial3, 0, &ch, 1) == 0)
    {
        rt_sem_control(&rx3_sem, RT_IPC_CMD_RESET, RT_NULL);
        rt_sem_take(&rx3_sem, RT_WAITING_FOREVER);
    }
    return ch;
}
void serial3_thread_entry(void *parameter)
{
    char ch;

while (1)
    {
        ch = uart3_recieve();
        rt_device_write(serial3, 0, &ch, 1);

}
}
rt_device_t uart3_thread(void)
{

char uart_name[RT_NAME_MAX];
 char str[] = "open uart3_thread! ";
 
 /* 查找串口设备 */
 rt_strncpy(uart_name, UART3, RT_NAME_MAX);
 serial3 = rt_device_find(uart_name);
 if (!serial3)
 {
 rt_kprintf("find %s failed! ", uart_name);
 return serial3;
 }
 /* 初始化信号量 */
 rt_sem_init(&rx3_sem, "rx3_sem", 0, RT_IPC_FLAG_FIFO);
 /* 以中断接收方式打开串口设备 */
 rt_device_open(serial3,RT_DEVICE_OFLAG_RDWR | RT_DEVICE_FLAG_INT_RX);
 /* 设置接收回调函数 */
 rt_device_set_rx_indicate(serial3, uart3_input);
 /* 发送字符串 */
 rt_device_write(serial3, 0, str, (sizeof(str) - 1));
 /* 创建 serial 线程 */
 rt_thread_t thread = rt_thread_create("serial3", serial3_thread_entry, RT_NULL, 2048, 25, 10);
 /* 创建成功则启动线程 */
 if (thread != RT_NULL)
 {
 rt_thread_startup(thread);
 }
 else
 {
 rt_kprintf("%s thread start failed! ", uart_name);
 return serial3;
 }
 rt_kprintf("%s start! ", uart_name);
 return serial3;
}```**GPIO部分代码:**

```#define LED    37
#define XFS5152CE_RST    39
#define M5310A_RST    38
#define PC10    51
#define PC11    52
#define PC12    53

void gpio_init(void)
{
    /* 设置PIN脚模式为输出 */
    rt_pin_mode(LED, PIN_MODE_OUTPUT);
    rt_pin_mode(XFS5152CE_RST, PIN_MODE_OUTPUT);
    rt_pin_mode(M5310A_RST, PIN_MODE_OUTPUT);
    rt_pin_mode(PC10, PIN_MODE_OUTPUT);
    rt_pin_mode(PC11, PIN_MODE_OUTPUT);
    rt_pin_mode(PC12, PIN_MODE_OUTPUT);

rt_pin_write(LED, PIN_LOW);
    rt_pin_write(XFS5152CE_RST, PIN_LOW);
    rt_pin_write(M5310A_RST, PIN_LOW);
    rt_pin_write(PC10, PIN_LOW);
    rt_pin_write(PC11, PIN_LOW);
    rt_pin_write(PC12, PIN_LOW);

}

void io_test(void *parameter)
{
 int level = 0;
 while(1)
 {
 rt_thread_delay(1000);
 if(level==1)
 {
 rt_pin_write(LED,1);
 rt_kprintf("LED is on ");
 level = 0;
 }
 else
 {
 rt_pin_write(LED,0);
 rt_kprintf("LED is off ");
 level = 1;
 }
 }
}```Uart问题是我无论发多少字节,总是只收到前两个字节,我断电跟踪也发现收到两字节后信号量就不释放了.譬如串口发abcd,程序只收到ab
GPIO就是根据drv_gpio里面的管教号分配后,没效果
我的芯片是STM32F103RBT6