Garima Gupta / Mbed 2 deprecated BLE_UART_LCD_Batt_DevInfo

Use of nRF51822 to demonstrate usage of BLE-UART service provided by Nordic and the use of uLCD-144-G2. The demonstration uses the nRF Master Control Panel and nRF UART demo apps provided by Nordic and available on Google Play and Apple Store. The firmware receives data over the TX characteristic, increments it by 1 and sends it over RX characteristic. The notifications need to be enabled for the RX characteristic in the Master Control Panel to be able to receive the data. For more information check the notebook page: http://developer.mbed.org/users/garimagupta002/notebook/ble-uart-lcd-demo/

Dependencies:   4DGL-uLCD-SE BLE_API DFRobot_BLE_LoopbackUART mbed nRF51822

Fork of DFRobot_BLE_LoopbackUART by Angelo qiao

main.cpp

Committer:
Rohit Grover
Date:
2014-06-13
Revision:
2:e060367b9024
Parent:
0:e910d9bb040f
Child:
5:4bc41267a03a

File content as of revision 2:e060367b9024:

/* mbed Microcontroller Library
 * Copyright (c) 2006-2013 ARM Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "mbed.h"
#include "BLEDevice.h"

#define BLE_UUID_NUS_SERVICE            0x0001 /**< The UUID of the Nordic UART Service. */
#define BLE_UUID_NUS_TX_CHARACTERISTIC  0x0002 /**< The UUID of the TX Characteristic. */
#define BLE_UUID_NUS_RX_CHARACTERISTIC  0x0003 /**< The UUID of the RX Characteristic. */

#define NEED_CONSOLE_OUTPUT 0 /* Set this if you need debug messages on the console;
                               * it will have an impact on code-size and power consumption. */

#if NEED_CONSOLE_OUTPUT
Serial  pc(USBTX, USBRX);
#define DEBUG(...) { pc.printf(__VA_ARGS__); }
#else
#define DEBUG(...) /* nothing */
#endif /* #if NEED_CONSOLE_OUTPUT */

BLEDevice  ble;
DigitalOut led1(LED1);

// The Nordic UART Service
static const uint8_t uart_base_uuid[] = {0x6e, 0x40, 0x00, 0x01, 0xb5, 0xa3, 0xf3, 0x93, 0xe0, 0xa9, 0xe5,0x0e, 0x24, 0xdc, 0xca, 0x9e};
static const uint8_t uart_tx_uuid[]   = {0x6e, 0x40, 0x00, 0x02, 0xb5, 0xa3, 0xf3, 0x93, 0xe0, 0xa9, 0xe5,0x0e, 0x24, 0xdc, 0xca, 0x9e};
static const uint8_t uart_rx_uuid[]   = {0x6e, 0x40, 0x00, 0x03, 0xb5, 0xa3, 0xf3, 0x93, 0xe0, 0xa9, 0xe5,0x0e, 0x24, 0xdc, 0xca, 0x9e};
static const uint8_t uart_base_uuid_rev[] = {0x9e, 0xca, 0xdc, 0x24, 0x0e, 0xe5, 0xa9, 0xe0, 0x93, 0xf3, 0xa3, 0xb5, 0x01, 0x00, 0x40, 0x6e};
uint8_t txPayload[8] = {0,};
uint8_t rxPayload[8] = {0,};
GattCharacteristic  txCharacteristic (uart_tx_uuid, txPayload, 1, 8,
                                      GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE_WITHOUT_RESPONSE);
GattCharacteristic  rxCharacteristic (uart_rx_uuid, rxPayload, 1, 8,
                                      GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY);
GattCharacteristic *uartChars[] = {&txCharacteristic, &rxCharacteristic};
GattService         uartService(uart_base_uuid, uartChars, sizeof(uartChars) / sizeof(GattCharacteristic *));

void disconnectionCallback(void)
{
    DEBUG("Disconnected!\n\r");
    DEBUG("Restarting the advertising process\n\r");
    ble.startAdvertising();
}

void onDataWritten(uint16_t charHandle)
{
    if (charHandle == txCharacteristic.getHandle()) {
        DEBUG("onDataWritten()\n\r");
        uint16_t bytesRead;
        ble.readCharacteristicValue(txCharacteristic.getHandle(), txPayload, &bytesRead);
        DEBUG("ECHO: %s\n\r", (char *)txPayload);
        ble.updateCharacteristicValue(rxCharacteristic.getHandle(), txPayload, bytesRead);
    }
}

void periodicCallback(void)
{
    led1 = !led1; /* Do blinky on LED1 while we're waiting for BLE events */
}

int main(void)
{
    led1 = 1;
    Ticker ticker;
    ticker.attach(periodicCallback, 1);

    DEBUG("Initialising the nRF51822\n\r");
    ble.init();
    ble.onDisconnection(disconnectionCallback);
    ble.onDataWritten(onDataWritten);

    /* setup advertising */
    ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED);
    ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
    ble.accumulateAdvertisingPayload(GapAdvertisingData::SHORTENED_LOCAL_NAME,
                                    (const uint8_t *)"BLE UART", sizeof("BLE UART") - 1);
    ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_128BIT_SERVICE_IDS,
                                    (const uint8_t *)uart_base_uuid_rev, sizeof(uart_base_uuid));

    ble.setAdvertisingInterval(160); /* 100ms; in multiples of 0.625ms. */
    ble.startAdvertising();

    ble.addService(uartService);

    while (true) {
        ble.waitForEvent();
    }
}