灵动微MM32F003硬件最小系统 --- 串口中断服务程序验证

本例程示范了利用串口中断服务程序进行串口数据的接受与发送。从电脑接收数据，当接收到\n字符后，将接收的所有数据，通过TX发送给电脑。

1 串口GPIO的初始化

void Uart_ConfigInit(u32 bound)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    UART_InitTypeDef UART_InitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART, ENABLE);
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA | RCC_AHBPeriph_GPIOB, ENABLE);

    GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_3); //RX
    GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_4); //TX

    UART_InitStructure.UART_BaudRate = bound;
    UART_InitStructure.UART_WordLength = UART_WordLength_8b;
    UART_InitStructure.UART_StopBits = UART_StopBits_1;
    UART_InitStructure.UART_Parity = UART_Parity_No;
    UART_InitStructure.UART_HardwareFlowControl = UART_HardwareFlowControl_None;
    UART_InitStructure.UART_Mode = UART_Mode_Rx | UART_Mode_Tx;

    UART_Init(UART, &UART_InitStructure);

    UART_ITConfig( UART,  UART_IT_RXIEN, ENABLE);

    UART_Cmd(UART, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
    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_6;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
}

2 串口中断服务程序

void NVIC_ConfigInit(void)
{
    NVIC_InitTypeDef NVIC_InitStruct;

    NVIC_InitStruct.NVIC_IRQChannel = UART_IRQn;
    NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
    NVIC_InitStruct.NVIC_IRQChannelPriority = 0;
    NVIC_Init(& NVIC_InitStruct);

}
void UART2_IRQHandler(void)
{
    if(UART_GetITStatus(UART, UART_IT_RXIEN) == SET) {                          //check receive status

        UART_ClearITPendingBit(UART, UART_IT_RXIEN);
        printBuf[rx_cnt % 100] = UART_ReceiveData(UART);

        if( printBuf[rx_cnt % 100] == '\n') {                                   //check '\n',and set send flag;
            tx_flag = 1;
            pTx = printBuf;
        }
        rx_cnt++;
    }
    if(UART->IER & UART_IT_TXIEN) {                                             //judge send empty interrupt enable
        if((UART_GetITStatus(UART, UART_IT_TXIEN) == SET)) {
            UartSendByte(*pTx++);
            UART_ClearITPendingBit(UART, UART_IT_TXIEN);
            rx_cnt--;
            if(rx_cnt == 0) {
                UART_ITConfig( UART,  UART_IT_TXIEN, DISABLE);
                tx_flag = 0;
            }
        }
    }
}

刚开始例程不能正常工作，检查后发现官方例程中断服务子程序名称为UART_IRQHandler，改为UART2_IRQHandler，就可以正常实现收发功能了。

3 main主程序流程

int main(void)
{
    InitSystick();
    RCC_ConfigInit();
    GPIO_ConfigInit();
    NVIC_ConfigInit();
    Uart_ConfigInit(9600);
    UartSendGroup((u8*)printBuf, sprintf(printBuf, "sprintf ok\r\n"));          //pintf stdio data
    UartSendAscii("UartSendAscii\r\n");                                         //printf string
    UartSendAscii("Please input data ,end with '\\n' \r\n");

    while(1) {

        if(tx_flag != 0) {
            UART_ITConfig( UART,  UART_IT_TXIEN, ENABLE);                       //clear send flag;
        }
    }
}

官方例程的修正已基本完成，需要程序的同学可以到百度网盘下载。
提取码：0o5i