File content as of revision 10:053397a8dc40:

/* 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.
 */
 //////////////////////////////////////////////////////////
///////////////////////NOTE ///////////////////////////////
// This program uses BBC microbit as a NRF51822 board    //
// with limited onboard functionality, mainly focused    //
// BLE-uart/ADC/DIO/PWM capability, see pin maping below //
///////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////
        
#include <string.h>
#include "mbed.h"
#include "BLE.h"
#include "stdio.h"
#include "UARTService.h"


#define NEED_CONSOLE_OUTPUT 1 // if BLE printf messages needed on the remote console (PC/phone/host);                            
#if NEED_CONSOLE_OUTPUT
#define BLEprintf(STR) { if (uart) uart->write(STR, strlen(STR)); }
#else
#define BLEprintf(...) 
#endif

///////////////// pin table /////////////////////////
/////////////////////////////////////////////////////
// ubit.pin    nrf51822pin    functions      note  //
/////////////////////////////////////////////////////
//  P2           P0_1        ADC/PWM/DIO      2    //
//  P1           P0_2        ADC/PWM/DIO      1    // 
//  P0           P0_3        ADC/PWM/DIO      0    //
//  P16          P_16            DIO               //
//  P14          P0_25       SPI MIS/DIO           //
//  P5           P_17        Button A/DI    pullup //
//  P11          P_26        Button B/DI    pullup //

/////////////////////////////////////////////////////
///////////////// not mapped yet ////////////////////
//  P20                      I2C SDA/DIO    pullup //
//  P19                      I2C SCL/DIO    pullup //
//  P15                      SPI MOS/DIO           //
//  P13                      SPI SCK/DIO           //
//  P16                                            //
//  P8                                             //

/////////////////////////////////////////////////////
//      LED Matrix pins are not mapped             //
/////////////////////////////////////////////////////


BLEDevice  ble;
UARTService *uart;
AnalogIn   ain(P0_3);
DigitalOut   dout(P0_16);
DigitalIn   din(P0_17);
 
int dVal, dec, i,j;  
float val,exBatt,f;
char buffer[10];
/////////////////// functions ///////////////////////



void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *params)
{
    ble.startAdvertising();
}

void periodicCallback(void)
{
    BLEprintf("\n");
    BLEprintf("Battery Volt: ");
    BLEprintf(buffer);
   // BLEprintf("\r\n");
    
}
///////////////////////////////////////////////
///////////////// MAIN FUNC ///////////////////
///////////////////////////////////////////////
 
int main(void)
{
    Ticker ticker;
    ticker.attach(periodicCallback, 2);
    ble.init();
    ble.onDisconnection(disconnectionCallback);    
    uart = new UARTService(ble);

    ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED);
    ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
    ble.accumulateAdvertisingPayload(GapAdvertisingData::SHORTENED_LOCAL_NAME,
                                     (const uint8_t *)"uBit BLE", sizeof("uBit BLE") - 1);
    ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_128BIT_SERVICE_IDS,
                                     (const uint8_t *)UARTServiceUUID_reversed, sizeof(UARTServiceUUID_reversed));

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

    while (true) 
    {
        ble.waitForEvent();
        dout = din.read();
        val = ain.read_u16();

 
// 100k+22k voltage divider
// 3.3 Vcc board voltage
 
    exBatt = (122/22)*3.6*val/1023.0; // ext batt volt 
    //exBatt =12.37;

    dVal = exBatt;  
    
    
    dec = (int)(exBatt * 100) % 100;
    if(exBatt>1 && exBatt<10){i=0;}
    if(exBatt>=10 && exBatt<100){i=1;}
    j=i;
    memset(buffer, 0, 10);
    
     while (dVal > 0)
        {
        buffer[i] = (dVal % 10) + '0';
        dVal /= 10;
        i--;
         }
    buffer[j+1] = '.';
    buffer[j+2] = (dec / 10) + '0';
    buffer[j+3] = (dec % 10) + '0';

     }
///////////// end of while(1) //////////////            
}
///////////// end of main  /////////////////