你能提供esp32-cam和stm32h7串口通信相关代码吗
时间: 2023-06-25 10:07:41 浏览: 323
STM32串口通信代码
当然可以!以下是一个简单的串口通信示例代码,使用ESP32-CAM作为发送端,STM32H7作为接收端:
ESP32-CAM代码:
```c
#include <WiFi.h>
#include <WiFiClient.h>
#include <WebServer.h>
#include "esp_camera.h"
#include <HardwareSerial.h>
#define SSID "Your_SSID"
#define PASSWORD "Your_PASSWORD"
#define SERIAL_BAUDRATE 115200
WebServer server(80);
HardwareSerial Serial2(2);
void setup() {
Serial.begin(SERIAL_BAUDRATE);
Serial2.begin(SERIAL_BAUDRATE, SERIAL_8N1, 16, 17);
Serial.println();
Serial.println("Connecting to Wi-Fi");
WiFi.begin(SSID, PASSWORD);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.println("Connecting to WiFi...");
}
Serial.println("Connected to Wi-Fi");
Serial.println("Starting web server...");
server.on("/", [](){
String html = "<html><body>";
html += "<h1>ESP32-CAM</h1>";
html += "<img src=\"/stream\">";
html += "</body></html>";
server.send(200, "text/html", html);
});
server.on("/stream", [](){
String boundary = "123456789000000000000987654321";
String header = "--" + boundary + "\r\nContent-Type: image/jpeg\r\nContent-Length: ";
String footer = "\r\n";
camera_fb_t *fb = NULL;
fb = esp_camera_fb_get();
if(!fb) {
Serial.println("Camera capture failed");
server.send(503, "text/plain", "Camera capture failed");
return;
}
String response = header + String(fb->len) + footer;
server.sendContent(response);
server.sendContent((const uint8_t *)fb->buf, fb->len);
esp_camera_fb_return(fb);
});
server.begin();
Serial.println("Web server started");
}
void loop() {
server.handleClient();
if(Serial2.available()) {
byte data = Serial2.read();
Serial.write(data);
}
}
```
STM32H7代码:
```c
#include "main.h"
#include "stm32h7xx_hal.h"
#include <string.h>
UART_HandleTypeDef huart3;
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART3_UART_Init(void);
int main(void) {
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_USART3_UART_Init();
uint8_t buffer[1024] = {0};
while (1) {
if(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_14) == GPIO_PIN_RESET) {
HAL_Delay(10);
if(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_14) == GPIO_PIN_RESET) {
HAL_UART_Transmit(&huart3, (uint8_t*)"Hello from STM32H7!\r\n", strlen("Hello from STM32H7!\r\n"), HAL_MAX_DELAY);
memset(buffer, 0, sizeof(buffer));
HAL_UART_Receive(&huart3, buffer, sizeof(buffer), HAL_MAX_DELAY);
HAL_UART_Transmit(&huart3, buffer, strlen((char*)buffer), HAL_MAX_DELAY);
}
}
}
}
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.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLM = 8;
RCC_OscInitStruct.PLL.PLLN = 400;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
RCC_OscInitStruct.PLL.PLLQ = 4;
RCC_OscInitStruct.PLL.PLLR = 4;
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_DIV4;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK) {
Error_Handler();
}
}
static void MX_USART3_UART_Init(void) {
huart3.Instance = USART3;
huart3.Init.BaudRate = 115200;
huart3.Init.WordLength = UART_WORDLENGTH_8B;
huart3.Init.StopBits = UART_STOPBITS_1;
huart3.Init.Parity = UART_PARITY_NONE;
huart3.Init.Mode = UART_MODE_TX_RX;
huart3.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart3.Init.OverSampling = UART_OVERSAMPLING_16;
if (HAL_UART_Init(&huart3) != HAL_OK) {
Error_Handler();
}
}
static void MX_GPIO_Init(void) {
GPIO_InitTypeDef GPIO_InitStruct = {0};
__HAL_RCC_GPIOB_CLK_ENABLE();
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_14, GPIO_PIN_SET);
GPIO_InitStruct.Pin = GPIO_PIN_14;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
GPIO_InitStruct.Pull = GPIO_PULLUP;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
}
```
在ESP32-CAM上,我们使用Serial2对象来初始化并配置串口,然后在loop()函数中检查Serial2的可用性。如果有数据可读,则从串口读取数据并将其发送到串口0(即通过USB连接到计算机的串口)。这样,我们可以使用串口监视器来查看ESP32-CAM发送的数据。
在STM32H7上,我们使用HAL_UART_Receive()函数从串口接收数据,并使用HAL_UART_Transmit()函数将数据发送回ESP32-CAM。在这个例子中,我们使用PB14引脚作为用户按钮,当按下按钮时,我们将向ESP32-CAM发送“Hello from STM32H7!”字符串,并等待ESP32-CAM的响应。收到响应后,我们将其发送回ESP32-CAM。
请注意,这只是一个简单的示例,实际应用程序可能需要更复杂的通信协议来确保数据的完整性和正确性。
阅读全文