STM32F103配置串口中断服务函数并接收double双精度数据,python发送和接收双精度数据

（1）首先，我们要进行串口中断服务函数的配置

void USART1_Config(void)
{
       GPIO_InitTypeDef GPIO_InitStructure;
       USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

       /* 打开IO时钟和串口时钟 */
       RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);

       /* 串口IO配置 */
       /* Configure USART1 Tx (PA.09) as alternate function push-pull */
       GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
       GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
       GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
       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);

       /* 串口1模式配置 */
       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_Rx | USART_Mode_Tx;
       USART_Init(USART1, &USART_InitStructure);


       /* 中断分组 */
       NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

       /* 配置串口中断 */
       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);

/* 打开串口中断 */
USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);

/* 打开串口1 */
USART_Cmd(USART1, ENABLE);

//重定向c库函数printf()到USART1
int fputc(int ch, FILE *f)
{
USART_SendData(USART1, (uint8_t) ch);
while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
return (ch);
}
}

(2)第二步，初始化和写串口中断服务函数

//参数初始化

double *n;
int num = 0;
u8 Buffer[8], Send_Buffer[8];
double double_data=12.345678;

//主函数

int main(void){

USART1_Config();

while(1){

printf("%f", double_data);

}

//中断服务函数

void USART1_IRQHandler(void)
{
       if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)//产生中断
       {
           USART_ClearITPendingBit(USART1,USART_IT_RXNE);//清除中断标志位
Buffer[num++] = USART_ReceiveData(USART1);
           if(num==8){
               n = (void *)Buffer;
               double_data = *n;
               num=0;
           }
       }
}

至此，STM32中的中断服务函数已完成，

运行后，当串口发送端给单片机发送double类型数据时，即可收到相应的双精度数据,这里提供python的接收和发送程序：

import struct
import serial

ser = serial.Serial()
ser.baudrate = 115200
ser.port = 'COM3'
print(ser)
ser.open()
print(ser.is_open)

//接收(这里接收到的是bytearray类型数据，要做具体类型转换可参考我的另一篇博客)
s = ser.read(8)
s1 = struct.unpack('8s', s)
print(s1)

//发送
value = (1.02255225,)
s2 = struct.Struct('d')
data = s2.pack(*value)
ser.write(data)

STM32F103配置串口中断服务函数并接收double双精度数据,python发送和接收双精度数据

猜你喜欢