标题: 菜鸟问题:ESP32S蓝牙为什么发送同一个值？TX传的是不同值啊 [打印本页]
作者: allrobot    时间: 2022-3-19 09:50
标题: 菜鸟问题:ESP32S蓝牙为什么发送同一个值？TX传的是不同值啊
问题是这样的，先上图：
手机端接收的，发现接收的notify都是同一个值：00 01 01 00 C0 C8 FD 3F 54 C0 FD.....3F 00 00 00 00

切回utf-8，就变成乱码了，变成这样：


由于我是菜鸟，只懂arduino软编程，C语言也只是略懂

蓝牙代码是用ESP32 example文件改来的，分析了很久没分析出什么，只好向高手求助了

以下是代码：
  1. #include <BLEDevice.h>
  2. #include <BLEServer.h>
  3. #include <BLEUtils.h>
  4. #include <BLE2902.h>
  5. BLEServer *pServer = NULL;
  6. BLECharacteristic *pTxCharacteristic;
  7. bool deviceConnected = false;
  8. bool oldDeviceConnected = false;
  9. uint8_t txValue = 0;

  11. // See the following for generating UUIDs:

  13. #define SERVICE_UUID "6E400001-B5A3-F393-E0A9-E50E24DCCA9E" // UART service UUID
  14. #define CHARACTERISTIC_UUID_RX "f78ebbff-c8b7-4107-93de-889a6a06d408"
  15. #define CHARACTERISTIC_UUID_TX "ca73b3ba-39f6-4ab3-91ae-186dc9577d99"

  17. class MyServerCallbacks : public BLEServerCallbacks
  18. {
  19.   void onConnect(BLEServer *pServer)
  20.   {
  21.     deviceConnected = true;
  22.   };

  24.   void onDisconnect(BLEServer *pServer)
  25.   {
  26.     deviceConnected = false;
  27.   }
  28. };

  30. class MyCallbacks : public BLECharacteristicCallbacks
  31. {
  32.   void onWrite(BLECharacteristic *pCharacteristic)
  33.   {
  34.     std::string rxValue = pCharacteristic->getValue();

  36.     if (rxValue.length() > 0)
  37.     {
  38.       Serial2.println("*********");
  39.       Serial2.print("Received Value: ");
  40.       for (int i = 0; i < rxValue.length(); i++)
  41.         Serial2.print(rxValue[i);

  43.       Serial2.println();
  44.       Serial2.println("*********");
  45.     }
  46.   }
  47. };
  48. void setup()
  49. {
  50.   Serial1.begin(250000, SERIAL_8N1, 3, 1);
  51.   Serial2.begin(250000, SERIAL_8N1, 16, 17);

  53.   // Create the BLE Device
  54.   BLEDevice::init("UART Service");

  56.   // Create the BLE Server
  57.   pServer = BLEDevice::createServer();
  58.   pServer->setCallbacks(new MyServerCallbacks());

  60.   // Create the BLE Service
  61.   BLEService *pService = pServer->createService(SERVICE_UUID);

  63.   // Create a BLE Characteristic
  64.   pTxCharacteristic = pService->createCharacteristic(
  65.       CHARACTERISTIC_UUID_TX,
  66.       BLECharacteristic::PROPERTY_NOTIFY);

  68.   pTxCharacteristic->addDescriptor(new BLE2902());

  70.   BLECharacteristic *pRxCharacteristic = pService->createCharacteristic(
  71.       CHARACTERISTIC_UUID_RX,
  72.       BLECharacteristic::PROPERTY_WRITE);

  74.   pRxCharacteristic->setCallbacks(new MyCallbacks());

  76.   // Start the service
  77.   pService->start();

  79.   // Start advertising
  80.   pServer->getAdvertising()->start();

  82.   Serial2.println("\nSet Serial1 ok!");
  83.   Serial2.println("Waiting a client connection to notify...");
  84. }

  86. void loop()
  87. {
  88.   if (deviceConnected)
  89.   {
  90.     // long time=millis();
  91.     // for(int i=0;i<1000;){
  92.     if (Serial1.available() > 0)
  93.     {
  94.       // int x=0;
  95.       // if(char(Serial1.peek())=='s'){i++;}
  96.       //   if(Serial1.peek()!='\n'){x++;}else{x=0;}


  99.       //tx传值，通过蓝牙notify不间断发送通知
  100.       Serial2.print(char(Serial1.peek()));
  101.       pTxCharacteristic->setValue(&txValue, Serial1.read());
  102.       pTxCharacteristic->notify();
  103.       // if(x>10){
  104.       //   Serial2.println();
  105.       //   Serial2.println("Error!!!");
  106.       //   delay(10000000000);
  107.       // }
  108.       delay(10);
  109.     }
  110.     // // }
  111.     //   float a=1000/((millis()-time)/1000);
  112.     //   Serial2.printf("Frequency domain:%f /n",a);
  113.     //   delay(1000000);
  114.   }
  115.   // disconnecting
  116.   if (!deviceConnected && oldDeviceConnected)
  117.   {
  118.     delay(500);                  // 让蓝牙堆栈有机会做好准备
  119.     pServer->startAdvertising(); // 重启广播
  120.     Serial2.println("start advertising");
  121.     oldDeviceConnected = deviceConnected;
  122.   }
  123.   // connecting
  124.   if (deviceConnected && !oldDeviceConnected)
  125.   {
  126.     // do stuff here on connecting在连接上做点事情
  127.     oldDeviceConnected = deviceConnected;
  128.     Serial2.println("start advertising");
  129.   }
  130. }
复制代码



理想的蓝牙情况是这样的，把其它微控制器传上来的值(sEMG和6个数值)通过UART发送到ESP32，ESP32再把UART缓冲区的单个字符一个个的当通知信息发出去：


请问咋解决啊，为啥蓝牙接收同一个值，还是乱码（；′д｀）ゞ
作者: 人工置顶员    时间: 2022-3-19 16:51
顶一下
作者: munuc_w    时间: 2022-3-21 08:52
注意字符与HEX的转换。



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