esp32和stm32串口通信
时间: 2023-12-30 08:03:11 浏览: 51
ESP32和STM32之间的串口通信可以通过以下步骤实现:
1. 确定通信协议:确定通信协议,包括波特率、数据位、停止位和校验位等。通常情况下,通信协议需要在ESP32和STM32之间完全相同才能实现正常通信。
2. 连接硬件:将ESP32的串口TX引脚连接到STM32的串口RX引脚,将ESP32的串口RX引脚连接到STM32的串口TX引脚。
3. 编写代码:在ESP32和STM32上分别编写代码以实现串口通信。在ESP32上,可以使用Arduino IDE和相应的ESP32库来编写代码,而在STM32上,则需要使用STM32CubeIDE等开发环境编写代码。
以下是一个示例代码,可以在ESP32上实现向STM32发送数据:
```C++
#include <HardwareSerial.h>
HardwareSerial Serial2(2);
void setup() {
Serial2.begin(9600, SERIAL_8N1, 16, 17);
}
void loop() {
Serial2.write("Hello STM32!");
delay(1000);
}
```
在STM32上,则可以使用HAL库实现接收ESP32发送的数据。以下是一个示例代码:
```C++
#include "main.h"
#include "stm32f1xx_hal.h"
#include <string.h>
UART_HandleTypeDef huart1;
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART1_UART_Init(void);
int main(void)
{
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_USART1_UART_Init();
uint8_t buffer[50];
uint8_t bufferIndex = 0;
while (1)
{
if (HAL_UART_Receive(&huart1, &buffer[bufferIndex], 1, HAL_MAX_DELAY) == HAL_OK) {
if (buffer[bufferIndex] == '\n' || buffer[bufferIndex] == '\r') {
buffer[bufferIndex] = '\0';
printf("Received: %s\n", buffer);
bufferIndex = 0;
} else {
bufferIndex++;
}
}
}
}
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
__HAL_RCC_PWR_CLK_ENABLE();
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
{
Error_Handler();
}
}
static void MX_USART1_UART_Init(void)
{
huart1.Instance = USART1;
huart1.Init.BaudRate = 9600;
huart1.Init.WordLength = UART_WORDLENGTH_8B;
huart1.Init.StopBits = UART_STOPBITS_1;
huart1.Init.Parity = UART_PARITY_NONE;
huart1.Init.Mode = UART_MODE_RX;
huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart1.Init.OverSampling = UART_OVERSAMPLING_16;
if (HAL_UART_Init(&huart1) != HAL_OK)
{
Error_Handler();
}
}
static void MX_GPIO_Init(void)
{
__HAL_RCC_GPIOC_CLK_ENABLE();
GPIO_InitTypeDef GPIO_InitStruct = {0};
GPIO_InitStruct.Pin = GPIO_PIN_13;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
}
```
在这个示例中,STM32会一直监听串口数据,并在收到数据后打印出来。注意,这里使用了printf函数,需要在代码中添加相应的实现。