RT-Thread-Nano下STM32F103C8T6如何使用uart2RT-Thread问答社区

Nano下STM32F103C8T6如何使用uart2

发布于 2019-12-23 15:16:09 浏览：1176 订阅该版

Nano下STM32F103C8T6如何使用uart2,使用正点原子103库
u8 USART2_RX_BUF[USART_REC_LEN];     //接收缓冲,最大USART_REC_LEN个字节.
//接收状态
//bit15，    接收完成标志
//bit14，    接收到0x0d
//bit13~0，    接收到的有效字节数目
u16 USART2_RX_STA=0;       //接收状态标记
void uart2_init(u32 bound){
  //GPIO端口设置
  GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;
     
    RCC_APB2PeriphClockCmd(RCC_APB1Periph_USART2|RCC_APB2Periph_GPIOA, ENABLE);    //使能USART1，GPIOA时钟
  
    //USART1_TX   GPIOA.9
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //PA.2
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;    //复用推挽输出
  GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.9
   
  //USART1_RX      GPIOA.10初始化
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;//PA3
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
  GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.10

//Usart1 NVIC 配置
  NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1 ;//抢占优先级3
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;        //子优先级3
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;            //IRQ通道使能
    NVIC_Init(&NVIC_InitStructure);    //根据指定的参数初始化VIC寄存器
  
   //USART 初始化设置

USART_InitStructure.USART_BaudRate = bound;//串口波特率
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
    USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
    USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;    //收发模式

USART_Init(USART2, &USART_InitStructure); //初始化串口1
  USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//开启串口接受中断
  USART_Cmd(USART2, ENABLE);                    //使能串口1

//u2_rx_sem = rt_sem_create("u2rxsem",0,RT_IPC_FLAG_FIFO);
    rt_sem_init(&u2_rx_sem,"u2rxsem",0,0);
}

void USART2_IRQHandler(void)                    //串口1中断服务程序
{
    //u8 Res;
    rt_enter_critical();
    if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)  //接收中断(接收到的数据必须是0x0d 0x0a结尾)
    {
        USART_ClearFlag(USART2,USART_IT_RXNE);
        g_data.u2rxdata =USART_ReceiveData(USART2);    //读取接收到的数据
        
        if((USART2_RX_STA&0x8000)==0)//接收未完成
        {
            if(USART2_RX_STA&0x4000)//接收到了0x0d
            {
                if(g_data.u2rxdata!= 0x0a) USART2_RX_STA=0;//接收错误,重新开始
                else USART2_RX_STA|=0x8000;    //接收完成了 
            }
            else //还没收到0X0D
            {    
                if(g_data.u2rxdata == 0x0d)USART2_RX_STA|=0x4000;
                else
                {
                    USART_RX_BUF[USART2_RX_STA&0X3FFF] = g_data.u2rxdata;
                    USART2_RX_STA++;
                    if(USART2_RX_STA>(USART_REC_LEN-1)) USART2_RX_STA=0;//接收数据错误,重新开始接收      
                }         
            }
        }            
   }
    rt_sem_release(&u2_rx_sem);
    rt_exit_critical();
}

ALIGN(RT_ALIGN_SIZE)
static char thread4_stack[256];
static struct rt_thread thread4;
static void rt_thread4_entry(void* parameter)
{
 static rt_err_t result;
 SimPWMInit();
 //TIM3_Int_Init(49,7199);//最小时间片为5ms
 
 while(1)
 {
// rt_kprintf("thread4 take a dynamic semaphore2. ");
// result = rt_sem_take(dynamic_sem2,RT_WAITING_FOREVER);
 rt_kprintf("thread4 take a uart2rx semaphore. "); 
 rt_sem_take(&u2_rx_sem,RT_WAITING_FOREVER);
 
 if(result != RT_EOK)
 {
 rt_kprintf("thread4 take a uart2rx semaphore, failed. ");
 rt_sem_delete(dynamic_sem1);
 }
 else
 {
 g_data.channle2_cnt++;
 rt_kprintf("thread4 take a uart2rx semaphore. number = %d ", g_data.channle2_cnt);
 }
 
// if(g_data.simpwmonoff)
// {
 if(USART2_RX_STA & 0x8000)//u2 receive complete
 {
 if('1' == g_data.u2rxdata)
 {

SimPWMOut(1,0,0,1);//EOS
 rt_kprintf("EOS--5ms ");
 LEVER_REG &=~LEVER_Ms5;
 
 }
 if('2' == g_data.u2rxdata)
 {

SimPWMOut(1,0,1,0);//+turn
 rt_kprintf("+turn--10ms ");
 LEVER_REG &=~LEVER_Ms10;
 
 }
 if('3' == g_data.u2rxdata)
 {

SimPWMOut(0,1,1,0);//EOS
 rt_kprintf("EOS--15ms ");
 LEVER_REG &=~LEVER_Ms15;
 
 }
 if('4' == g_data.u2rxdata)
 {

SimPWMOut(0,1,0,1);//-turn
 rt_kprintf("-turn--20ms ");
 LEVER_REG &=~LEVER_Ms20;
 
 }
 }
// }
 }
}
好像U2的中断都进不了，请高手指教，急用。