帮我写个esp32与stm32串口通信代码，esp32基于ESP-IDF，stm32基于keil

好的，我可以回答这个问题。以下是一个简单的示例代码：

ESP32 代码：

#include "driver/uart.h"

void app_main()
{
    uart_config_t uart_config = {
        .baud_rate = 115200,
        .data_bits = UART_DATA_8_BITS,
        .parity = UART_PARITY_DISABLE,
        .stop_bits = UART_STOP_BITS_1,
        .flow_ctrl = UART_HW_FLOWCTRL_DISABLE
    };
    uart_param_config(UART_NUM_1, &uart_config);
    uart_set_pin(UART_NUM_1, 17, 16, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
    uart_driver_install(UART_NUM_1, 1024, , , NULL, );

    while (1) {
        uart_write_bytes(UART_NUM_1, "Hello STM32!\n", 14);
        vTaskDelay(100 / portTICK_RATE_MS);
    }
}

STM32 代码：

#include "stm32f10x.h"
#include "stdio.h"

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

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | 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);
}

int main(void)
{
    USART1_Init();

    while (1) {
        if (USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == SET) {
            char ch = USART_ReceiveData(USART1);
            printf("Received: %c\n", ch);
        }
    }
}

这两个代码可以实现 ESP32 和 STM32 之间的串口通信。你可以根据自己的需求进行修改。