stm32f103rct6跟openmv的uart串口通信代码

下面是stm32f103rct6跟openmv的串口通信代码，假设你使用的是USART1接口，波特率为115200：

#include "stm32f10x.h"

#define USART USART1
#define RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO | RCC_APB2Periph_USART1

void USART1_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO | RCC_APB2Periph_USART1, ENABLE);

    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);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &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_Rx | USART_Mode_Tx;
    USART_Init(USART1, &USART_InitStructure);

    USART_Cmd(USART1, ENABLE);
}

void USART1_SendByte(uint8_t byte)
{
    while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
    USART_SendData(USART1, byte);
}

uint8_t USART1_ReceiveByte(void)
{
    while (USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET);
    return USART_ReceiveData(USART1);
}

int main(void)
{
    USART1_Init();

    while (1)
    {
        // 从串口接收数据
        uint8_t data = USART1_ReceiveByte();

        // 将数据发送回去
        USART1_SendByte(data);
    }

    return 0;
}

下面是openmv的串口通信代码，假设你使用的是COM5串口，波特率为115200：

import time
from pyb import UART

uart = UART(3, 115200)  # COM5

while True:
    # 从串口接收数据
    data = uart.read(1)

    if data is not None:
        # 将数据发送回去
        uart.write(data)