【RISC-V MCU CH32V103测评】UART串行通讯

jennyzhaojie

【RISC-V MCU CH32V103测评】UART串行通讯 [复制链接]

 

CH32V103有3个串口，分别是USART1、USART2及USART3，所占用的引脚如下：

USART1 TX-->A.9   RX-->A.10

USART2 TX-->A.2   RX-->A.3

USART3 TX-->B.10  RX-->B.11

在通常的情况下，USART1作调试信息输出口，其它2个串口作通讯功能用。

此外，在使用过程它又分为以查询方式接受和以中断方式接收。

最近在一个朋友的项目中要用到3个串行口，且需要以中断方式进行接收，为此打算以CH32V103来解决它。

作为中断方式接收在例程中有使用2个串口的示例，因此关键的是解决第3个串口的中断接收问题，也就是解决USART1中断接收的问题。

经过努力，该问题得到了较好地解决，其测试连接和效果如图1至图3所示。

图1  测试线路连接

 

图2  双串口通信测试

 

图3  UART1中断接收测试

 

3个串口的中断接收初始化函数为：

void USART_Printf_Init(uint32_t baudrate)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  USART_InitTypeDef USART_InitStructure;
#if (DEBUG == DEBUG_UART1)
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
#elif (DEBUG == DEBUG_UART2)
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
#elif (DEBUG == DEBUG_UART3)
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
#endif
  USART_InitStructure.USART_BaudRate = baudrate;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Tx;
#if (DEBUG == DEBUG_UART1)
  USART_Init(USART1, &USART_InitStructure);
  USART_Cmd(USART1, ENABLE);
#elif (DEBUG == DEBUG_UART2)
  USART_Init(USART2, &USART_InitStructure);
  USART_Cmd(USART2, ENABLE);
#elif (DEBUG == DEBUG_UART3)
  USART_Init(USART3, &USART_InitStructure);
  USART_Cmd(USART3, ENABLE);
#endif
}

3个串口的中断接收引脚配置化函数为：

void USARTx_CFG(void)
{
    GPIO_InitTypeDef  GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;
    NVIC_InitTypeDef  NVIC_InitStructure;
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2|RCC_APB1Periph_USART3, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |RCC_APB2Periph_GPIOB , ENABLE);
    /* USART1 TX-->A.9   RX-->A.10 */
    //GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
    //GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    //GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    //GPIO_Init(GPIOA, &GPIO_InitStructure);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    /* USART2 TX-->A.2   RX-->A.3 */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    /* USART3 TX-->B.10  RX-->B.11 */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOB, &GPIO_InitStructure);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOB, &GPIO_InitStructure);
    USART_InitStructure.USART_BaudRate = 115200;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl =    USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
    USART_Init(USART1, &USART_InitStructure);
    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
    USART_Init(USART2, &USART_InitStructure);
    USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
    USART_Init(USART3, &USART_InitStructure);
    USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
    NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
    NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
    USART_Cmd(USART1, ENABLE);
    USART_Cmd(USART2, ENABLE);
    USART_Cmd(USART3, ENABLE);
}

主程序的内容为：

int main(void)
{
    uint8_t i;
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
    Delay_Init();
    USART_Printf_Init(115200);//115200
    printf("SystemClk:%d\r\n",SystemCoreClock);
    printf("USART Interrupt TEST！ \r\n");
    USARTx_CFG(); 
    Rxfinish0=0;
    while(1)
    {
              if(Rxfinish0==1)
              {
                     Rxfinish0=0;
                     TxCnt0=0;
                     while(TxCnt0<10)
                     {
                         USART_SendData(USART1, RxBuffer0[TxCnt0++]);
                         while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
                     }
                     RxCnt0=0;
                     //USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
              }
    }
}

 

freebsder

串口的设置应该都是一样的吧，抄来改改就好了。

jennyzhaojie

freebsder 发表于 2021-2-25 22:30 串口的设置应该都是一样的吧，抄来改改就好了。

但必须去实践和测试！