esp32-cam和stm32h7串口通信
时间: 2023-06-25 22:07:41 浏览: 133
要实现ESP32-CAM和STM32H7之间的串口通信,您需要连接它们之间的串口线,并编写相应的代码来进行数据传输。以下是一些基本的步骤:
1. 首先,确定使用的串口通信协议(如UART、SPI、I2C等)以及通信的速率(波特率)。
2. 连接ESP32-CAM和STM32H7之间的串口线。具体连接方式取决于您使用的串口协议。例如,如果使用UART协议,则需要连接TX和RX线。
3. 在STM32H7上编写代码以初始化和配置串口,并确保它们的设置与ESP32-CAM相匹配。例如,如果ESP32-CAM使用9600波特率进行UART通信,则需要将STM32H7的串口设置为相同的波特率。
4. 在STM32H7上编写代码以发送和接收数据。您可以使用STM32H7的串口库(如HAL库)来实现此功能。例如,您可以使用HAL_UART_Transmit函数来发送数据,使用HAL_UART_Receive函数来接收数据。
5. 在ESP32-CAM上编写代码以发送和接收数据。您可以使用ESP32-CAM的串口库(如Serial库)来实现此功能。例如,您可以使用Serial.write函数来发送数据,使用Serial.read函数来接收数据。
6. 测试通信。将数据从STM32H7发送到ESP32-CAM,并确保ESP32-CAM正确接收并处理数据。反之亦然。
请注意,这只是一个基本的指导,实际实现可能会更加复杂,具体取决于您的应用程序需求和硬件设置。
相关问题
你能提供esp32-cam和stm32h7串口通信相关代码吗
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。
你能提供esp32-cam和stm32h7串口通信六轮小车,具有无线传输监控画面的硬件连接和相关代码吗
当然可以。下面是具体的硬件连接和代码实现:
硬件连接:
1. ESP32-CAM与STM32H7串口连接:
ESP32-CAM的UART0引脚RX和TX分别连接到STM32H7的UART2的TX和RX引脚。
2. 无线传输监控画面:
ESP32-CAM通过WiFi模块实现画面传输,可以使用ESP32-CAM板载的WiFi模块或者外接ESP8266模块。具体的连接方式可以参考ESP32-CAM的官方文档。
3. 六轮小车连接:
六轮小车的电机驱动模块需要连接到STM32H7的PWM输出引脚,用来控制六个电机的转速。此外,还需要连接六个编码器的输出信号到STM32H7的外部中断输入引脚,用来获取六个电机的转动信息。
代码实现:
1. ESP32-CAM代码:
在ESP32-CAM上运行一个简单的Web服务器,并将摄像头采集到的画面通过WiFi传输到客户端。下面是一个简单的代码示例:
```c
#include "esp_camera.h"
#include <WiFi.h>
const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";
WiFiServer server(80);
void setup() {
Serial.begin(115200);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.println("Connecting to WiFi...");
}
Serial.println("Connected to WiFi");
server.begin();
Serial.println("Server started");
}
void loop() {
WiFiClient client = server.available();
if (client) {
Serial.println("New client");
client.flush();
camera_fb_t* fb = esp_camera_fb_get();
if (fb) {
uint8_t* buf = fb->buf;
size_t len = fb->len;
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: multipart/x-mixed-replace; boundary=frame");
client.println();
while (client.connected()) {
client.write("--frame\r\n");
client.write("Content-Type: image/jpeg\r\n");
client.write("Content-Length: " + String(len) + "\r\n");
client.write("\r\n");
client.write(buf, len);
client.write("\r\n");
}
esp_camera_fb_return(fb);
} else {
client.println("HTTP/1.1 500 Internal Server Error");
}
client.stop();
Serial.println("Client disconnected");
}
}
```
2. STM32H7代码:
在STM32H7上运行一个简单的控制程序,通过串口接收来自客户端的指令,并控制六轮小车的运动。下面是一个简单的代码示例:
```c
#include <SoftwareSerial.h>
#include <Encoder.h>
#define LEFT_MOTOR_PWM_PIN 10
#define LEFT_MOTOR_ENCODER_PIN 2
#define RIGHT_MOTOR_PWM_PIN 11
#define RIGHT_MOTOR_ENCODER_PIN 3
#define FRONT_MOTOR_PWM_PIN 12
#define FRONT_MOTOR_ENCODER_PIN 4
#define REAR_MOTOR_PWM_PIN 13
#define REAR_MOTOR_ENCODER_PIN 5
#define MIDDLE_MOTOR_PWM_PIN 14
#define MIDDLE_MOTOR_ENCODER_PIN 6
#define BACK_MOTOR_PWM_PIN 15
#define BACK_MOTOR_ENCODER_PIN 7
#define FORWARD 1
#define BACKWARD -1
#define LEFT -1
#define RIGHT 1
Encoder leftEncoder(LEFT_MOTOR_ENCODER_PIN);
Encoder rightEncoder(RIGHT_MOTOR_ENCODER_PIN);
Encoder frontEncoder(FRONT_MOTOR_ENCODER_PIN);
Encoder rearEncoder(REAR_MOTOR_ENCODER_PIN);
Encoder middleEncoder(MIDDLE_MOTOR_ENCODER_PIN);
Encoder backEncoder(BACK_MOTOR_ENCODER_PIN);
SoftwareSerial espSerial(2, 3); // RX, TX
String command;
void setup() {
Serial.begin(115200);
espSerial.begin(115200);
pinMode(LEFT_MOTOR_PWM_PIN, OUTPUT);
pinMode(RIGHT_MOTOR_PWM_PIN, OUTPUT);
pinMode(FRONT_MOTOR_PWM_PIN, OUTPUT);
pinMode(REAR_MOTOR_PWM_PIN, OUTPUT);
pinMode(MIDDLE_MOTOR_PWM_PIN, OUTPUT);
pinMode(BACK_MOTOR_PWM_PIN, OUTPUT);
}
void loop() {
if (espSerial.available()) {
command = espSerial.readStringUntil('\n');
if (command == "forward") {
move(FORWARD, FORWARD, FORWARD, FORWARD, FORWARD, FORWARD);
} else if (command == "backward") {
move(BACKWARD, BACKWARD, BACKWARD, BACKWARD, BACKWARD, BACKWARD);
} else if (command == "left") {
turn(LEFT, LEFT, LEFT, RIGHT, RIGHT, RIGHT);
} else if (command == "right") {
turn(RIGHT, RIGHT, RIGHT, LEFT, LEFT, LEFT);
} else if (command == "stop") {
stop();
}
}
}
void move(int leftSpeed, int rightSpeed, int frontSpeed, int rearSpeed, int middleSpeed, int backSpeed) {
analogWrite(LEFT_MOTOR_PWM_PIN, leftSpeed);
analogWrite(RIGHT_MOTOR_PWM_PIN, rightSpeed);
analogWrite(FRONT_MOTOR_PWM_PIN, frontSpeed);
analogWrite(REAR_MOTOR_PWM_PIN, rearSpeed);
analogWrite(MIDDLE_MOTOR_PWM_PIN, middleSpeed);
analogWrite(BACK_MOTOR_PWM_PIN, backSpeed);
}
void turn(int leftSpeed, int rightSpeed, int frontSpeed, int rearSpeed, int middleSpeed, int backSpeed) {
analogWrite(LEFT_MOTOR_PWM_PIN, leftSpeed);
analogWrite(RIGHT_MOTOR_PWM_PIN, rightSpeed);
analogWrite(FRONT_MOTOR_PWM_PIN, frontSpeed);
analogWrite(REAR_MOTOR_PWM_PIN, rearSpeed);
analogWrite(MIDDLE_MOTOR_PWM_PIN, middleSpeed);
analogWrite(BACK_MOTOR_PWM_PIN, backSpeed);
}
void stop() {
analogWrite(LEFT_MOTOR_PWM_PIN, 0);
analogWrite(RIGHT_MOTOR_PWM_PIN, 0);
analogWrite(FRONT_MOTOR_PWM_PIN, 0);
analogWrite(REAR_MOTOR_PWM_PIN, 0);
analogWrite(MIDDLE_MOTOR_PWM_PIN, 0);
analogWrite(BACK_MOTOR_PWM_PIN, 0);
}
```
以上代码仅供参考,具体实现需要根据实际情况进行调整。
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