esp32 txrx通讯
时间: 2024-08-16 16:08:04 浏览: 37
ESP32是一种基于Espressif Systems的低功耗、高性能的物联网开发板,它集成了Wi-Fi和蓝牙功能。其中的TX(Transmit,发送)和RX(Receive,接收)指的是串行通信中的数据传输方向。
在ESP32的UART(Universal Asynchronous Receiver/Transmitter,通用异步收发器)模式下,TX表示从主控芯片发送数据到外部设备,如传感器或另一个ESP32模块;而RX则负责接收外部设备发回的数据。通过配置特定的波特率、数据位数、停止位和校验位等设置,ESP32可以与其他微控制器或传感器建立串行通信连接。
开发时,你可以使用ESP32的API,如`Serial.begin()`初始化串口通信,`Serial.print()`发送数据,`Serial.read()`接收数据。示例代码可能会涉及硬件上RX/TX管脚的连接以及相应的中断处理。
相关问题
esp32 txrx通讯 api
ESP32是一种基于Espressif Systems的低功耗Wi-Fi/Bluetooth SoC(系统级芯片),其提供了丰富的串口通讯API(Application Programming Interface),包括TX(发送)和RX(接收)操作。对于基本的UART通信,你可以使用`esp32-hal`库中的`ESP32UART`或`ESP32LowPowerUART`类,例如:
```c
#include "driver/uart.h"
// 初始化UART
uart_config_t uart_cfg = {
.baudrate = 9600,
.data_bits = UART_DATA_8BIT,
.parity = UART_PARITY_NONE,
.stop_bits = UART_STOP_1BIT,
.flow_ctrl = false,
};
esp_err_t ret = uart.begin(0, &uart_cfg); // 0通常是GPIO16/GPIO5(TX/RX)
if (ret == ESP_OK) {
// 发送数据
char tx_data[] = "Hello from ESP32";
for (char *p = tx_data; *p != '\0'; p++) {
while (!uart_tx_empty(UART0)); // 等待发送缓冲区空闲
uart_putchar(UART0, *p);
}
// 接收数据
char rx_buffer[10];
while (uart_rx_chars-available(UART0) > 0) { // 检查接收缓冲区是否有数据
uart_getchar(UART0, rx_buffer);
printf("Received: %s\n", rx_buffer);
}
} else {
printf("Failed to initialize UART: %d\n", ret);
}
```
esp32 与arduino蓝牙通讯
ESP32和Arduino之间的蓝牙通信可以通过使用ESP32作为蓝牙服务器和Arduino作为蓝牙客户端来实现。以下是一个简单的例子,演示了如何在ESP32和Arduino之间进行蓝牙通信:
1. 首先,需要在ESP32上启用蓝牙服务器功能。可以使用Arduino IDE和ESP32的BLE库来实现。以下是一个简单的代码片段,演示了如何在ESP32上启用蓝牙服务器功能:
```c++
#include <BLEDevice.h>
#include <BLEServer.h>
#include <BLEUtils.h>
#include <BLE2902.h>
BLEServer* pServer = NULL;
BLECharacteristic* pCharacteristic = NULL;
bool deviceConnected = false;
bool oldDeviceConnected = false;
uint8_t txValue = 0;
#define SERVICE_UUID "4fafc201-1fb5-459e-8fcc-c5c9c331914b"
#define CHARACTERISTIC_UUID "beb5483e-36e1-4688-b7f5-ea07361b26a8"
class MyServerCallbacks: public BLEServerCallbacks {
void onConnect(BLEServer* pServer) {
deviceConnected = true;
};
void onDisconnect(BLEServer* pServer) {
deviceConnected = false;
}
};
void setup() {
Serial.begin(115200);
BLEDevice::init("ESP32_BLE_Server");
pServer = BLEDevice::createServer();
pServer->setCallbacks(new MyServerCallbacks());
BLEService *pService = pServer->createService(SERVICE_UUID);
pCharacteristic = pService->createCharacteristic(
CHARACTERISTIC_UUID,
BLECharacteristic::PROPERTY_READ |
BLECharacteristic::PROPERTY_WRITE |
BLECharacteristic::PROPERTY_NOTIFY |
BLECharacteristic::PROPERTY_INDICATE
);
pCharacteristic->addDescriptor(new BLE2902());
pService->start();
BLEAdvertising *pAdvertising = pServer->getAdvertising();
pAdvertising->addServiceUUID(pService->getUUID());
pAdvertising->setScanResponse(true);
pAdvertising->setMinPreferred(0x06); pAdvertising->setMinPreferred(0x12);
BLEDevice::startAdvertising();
Serial.println("Waiting for a client connection to notify...");
}
void loop() {
if (deviceConnected) {
pCharacteristic->setValue(&txValue, 1);
pCharacteristic->notify();
txValue++;
delay(10); // bluetooth stack will go into congestion, if too many packets are sent
}
if (!deviceConnected && oldDeviceConnected) {
delay(500); // give the bluetooth stack the chance to get things ready
pServer->startAdvertising(); // restart advertising
Serial.println("start advertising");
oldDeviceConnected = deviceConnected;
}
if (deviceConnected && !oldDeviceConnected) {
// do stuff here on connecting
oldDeviceConnected = deviceConnected;
}
}
```
2. 接下来,需要在Arduino上编写蓝牙客户端代码。以下是一个简单的代码片段,演示了如何在Arduino上连接到ESP32的蓝牙服务器并发送数据:
```c++
#include <SoftwareSerial.h>
SoftwareSerial BTSerial(10, 11); // RX | TX
void setup() {
Serial.begin(9600);
BTSerial.begin(9600); // HC-05 default speed in AT command more
}
void loop() {
if (BTSerial.available()) {
Serial.write(BTSerial.read());
}
if (Serial.available()) {
BTSerial.write(Serial.read());
}
}
```
在这个例子中,Arduino使用SoftwareSerial库将数据发送到ESP32的蓝牙服务器。可以使用Serial Monitor来查看从ESP32返回的数据。