AmebaD BLE Demo with nRF Toolbox and Arduino IDE

Here I’m showcasing simple GPIO/LED control with nRF Toolbox and Arduino IDE, The Arduino sketch is a modified from BLE UART Example.

Tools Used:

  • Ameba RTL8722DM Board (AMB 21)
  • Nordic nRF Toolbox
  • Arduino IDE
  • Android Phone
#include "BLEDevice.h"

#define UART_SERVICE_UUID      "6E400001-B5A3-F393-E0A9-E50E24DCCA9E"
#define CHARACTERISTIC_UUID_RX "6E400002-B5A3-F393-E0A9-E50E24DCCA9E"
#define CHARACTERISTIC_UUID_TX "6E400003-B5A3-F393-E0A9-E50E24DCCA9E"

#define STRING_BUF_SIZE 100

#define led 13

BLEService UartService(UART_SERVICE_UUID);
BLECharacteristic Rx(CHARACTERISTIC_UUID_RX);
BLECharacteristic Tx(CHARACTERISTIC_UUID_TX);
BLEAdvertData advdata;
BLEAdvertData scndata;
bool notify = false;

void readCB (BLECharacteristic* chr, uint8_t connID) {
    printf("Characteristic %s read by connection %d \n", chr->getUUID().str(), connID);
}

void writeCB (BLECharacteristic* chr, uint8_t connID) {
    printf("Characteristic %s write by connection %d :\n", chr->getUUID().str(), connID);
    if (chr->getDataLen() > 0) {
        Serial.print("Received string: ");
        Serial.print(chr->readString());
        if(chr->readString() == "1")
        {
          digitalWrite(led,HIGH);
        }
        else if(chr->readString() == "0")
        {
          digitalWrite(led,LOW);
        }
        
        Serial.println();
    }
}

void notifCB (BLECharacteristic* chr, uint8_t connID, uint16_t cccd) {
    if (cccd & GATT_CLIENT_CHAR_CONFIG_NOTIFY) {
        printf("Notifications enabled on Characteristic %s for connection %d \n", chr->getUUID().str(), connID);
        notify = true;
    } else {
        printf("Notifications disabled on Characteristic %s for connection %d \n", chr->getUUID().str(), connID);
        notify = false;
    }
}

void setup() {
    Serial.begin(115200);

    advdata.addFlags(GAP_ADTYPE_FLAGS_LIMITED | GAP_ADTYPE_FLAGS_BREDR_NOT_SUPPORTED);
    advdata.addCompleteName("AMEBA_BLE_DEV");
    scndata.addCompleteServices(BLEUUID(UART_SERVICE_UUID));

    Rx.setWriteProperty(true);
    Rx.setWriteCallback(writeCB);
    Rx.setBufferLen(STRING_BUF_SIZE);
    Tx.setReadProperty(true);
    Tx.setReadCallback(readCB);
    Tx.setNotifyProperty(true);
    Tx.setCCCDCallback(notifCB);
    Tx.setBufferLen(STRING_BUF_SIZE);

    UartService.addCharacteristic(Rx);
    UartService.addCharacteristic(Tx);

    BLE.init();
    BLE.configAdvert()->setAdvData(advdata);
    BLE.configAdvert()->setScanRspData(scndata);
    BLE.configServer(1);
    BLE.addService(UartService);

    BLE.beginPeripheral();

    pinMode(led,OUTPUT);
}

void loop() {
    if (Serial.available()) {
        Tx.writeString(Serial.readString());
        if (BLE.connected(0) && notify) {
            Tx.notify(0);
        }
    }
    delay(100);
}

Thanks :slightly_smiling_face::+1:.

1 Like

Very cool~

1 Like