STM32中斷數據回調函數接收處理

1.定義一個空的指針函數 指針函數的參數是uint8_t 類型ch

typedef void (* usart_recv_callback)(uint8_t ch);

2.聲明這個類型

usart_recv_callback  usart1_recv_cb;

3.串口配置時，一個形參爲串口中斷接收回調

void Usart_Config(USART_TypeDef* USARTx, uint32_t baudRate, usart_recv_callback cb)

{

 GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;
    if(USARTx == USART1)
    {
        usart1_recv_cb = cb;
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
        /* Configure USART1 Tx (PA.09) as alternate function push-pull */
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
        GPIO_Init(GPIOA, &GPIO_InitStructure);
        /* Configure USART1 Rx (PA.10) as input floating */
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
        GPIO_Init(GPIOA, &GPIO_InitStructure);
        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_Rx | USART_Mode_Tx;
        USART_Init(USART1, &USART_InitStructure);
        if(cb)
        {
            USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

            /* Enable the USARTy Interrupt */
            NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
            NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
            NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
            NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
            NVIC_Init(&NVIC_InitStructure);
        }
        USART_Cmd(USART1, ENABLE);
    }

}

分析：usart1_recv_cb = cb;這句語句是將形參指針函數 cb 賦值給 usart1_recv_cb

            if(cb):是判斷回調函數指針是否爲空，如果不爲空則中斷初始化

4.串口中斷函數

void USART1_IRQHandler(void)
{
     uint8_t ch;
     if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
     {
         /* Read one byte from the receive data register */
         ch = USART_ReceiveData(USART1);
         usart1_recv_cb(ch);
         USART_ClearITPendingBit(USART1, USART_IT_RXNE);
     }
}

分析：將串口1中斷接收到的值賦值給ch，然後ch作爲usart1_recv_cb函數的輸入參數

5.

void HCHO_Test(uint8_t recv_data)
{
if((sensorstr.hcho_addr == 0) && (recv_data != 0xff))
{
        sensorstr.hcho_addr = 0;
return;
}
if((sensorstr.hcho_addr == 1) && (recv_data != 0x17))
{
   sensorstr.hcho_addr = 0;
return;
}
if((sensorstr.hcho_addr == 2) && (recv_data != 0x04))
{
        sensorstr.hcho_addr = 0;
return;
}
    
sensorstr.hcho_packet[sensorstr.hcho_addr++] = recv_data;
}

分析：void HCHO_Test(uint8_t recv_data)函數就是我們所說的回調函數，此函數和 1.裏所定義的void (* usart_recv_callback)(uint8_t ch)函數指針是對應的。

6.

int main(void)

{

Usart_Config(PM_UART, 9600, PM_Test);

}

PM_Test函數首地址就是usart_recv_callback cb的形參