File content as of revision 4:635dcca9e11a:

/*

Copyright (c) 2012-2014 RedBearLab

Permission is hereby granted, free of charge, to any person obtaining a copy of this software 
and associated documentation files (the "Software"), to deal in the Software without restriction, 
including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, 
and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, 
subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR 
PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE 
FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

*/

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

// Constants
#define BLE_UUID_TXRX_SERVICE            0x0000 /**< The UUID of the Nordic UART Service. */
#define BLE_UUID_TX_CHARACTERISTIC       0x0002 /**< The UUID of the TX Characteristic. */
#define BLE_UUIDS_RX_CHARACTERISTIC      0x0003 /**< The UUID of the RX Characteristic. */

#define TXRX_BUF_LEN                     20

//#define DIGITAL_OUT_PIN                  P0_9       //TXD
//#define DIGITAL_IN_PIN                   P0_10      //CTS
//#define PWM_PIN                          P0_11      //RXD
//#define ANALOG_IN_PIN                    P0_4       //P04

#define AC_EN_PIN   P0_4
#define DC_EN_PIN   P0_5
#define PAIRING_LED_PIN P0_7
#define BYPASS_ADC_PIN P0_6
#define PAIRING_BUTTON_PIN P0_15
#define POS_OFFSET_EN_PIN P0_29
#define NEG_OFFSET_EN_PIN P0_28
#define STATUS_LED_PIN P0_11
#define RESET_PIN P0_09

#define COUPLING_SETTING 0x1
#define OFFSET_SETTING 0x2
#define TRIGGER_DIR_SETTING 0x3
#define TRIGGER_VALUE_SETTING 0x4
#define AVERAGING_SETTING 0x5
#define VOLTAGE_RANGE_SETTING 0x6
#define TIME_SHIFT_SETTING 0x7
#define TIME_RANGE_SETTING 0x8

#define AC_COUPLING 0
#define DC_COUPLING 1
#define NEG_EDGE 0
#define POS_EDGE 1

// Global Settings
bool coupling_type;  // 0 is AC, 1 is DC
uint8_t offset_value;
bool trigger_dir; // 0 is negative, 1 is positive
uint8_t trigger_value;
uint8_t voltage_range;
uint8_t averaging_amount;
uint8_t time_shift_value;
uint8_t time_range_value;

BLEDevice  ble;

// Pins declaration
DigitalOut      AC_EN(AC_EN_PIN);
DigitalOut      DC_EN(DC_EN_PIN);
DigitalOut      PAIRING_LED(PAIRING_LED_PIN);
AnalogIn        BYPASS_ADC(BYPASS_ADC_PIN);
DigitalIn       PARING_BUTTON(PAIRING_BUTTON_PIN);
DigitalOut      NEG_OFFSET_EN(NEG_OFFSET_EN_PIN);
DigitalOut      POS_OFFSET_EN(POS_OFFSET_EN_PIN);
DigitalOut      STATUS_LED(STATUS_LED_PIN);
DigitalOut      RESET(RESET_PIN);


//Serial pc(USBTX, USBRX);

static uint8_t analog_enabled = 0;
static uint8_t old_state = 0;

// The Nordic UART Service
static const uint8_t uart_base_uuid[] = {0x71, 0x3D, 0, 0, 0x50, 0x3E, 0x4C, 0x75, 0xBA, 0x94, 0x31, 0x48, 0xF1, 0x8D, 0x94, 0x1E};
static const uint8_t uart_tx_uuid[]   = {0x71, 0x3D, 0, 3, 0x50, 0x3E, 0x4C, 0x75, 0xBA, 0x94, 0x31, 0x48, 0xF1, 0x8D, 0x94, 0x1E};
static const uint8_t uart_rx_uuid[]   = {0x71, 0x3D, 0, 2, 0x50, 0x3E, 0x4C, 0x75, 0xBA, 0x94, 0x31, 0x48, 0xF1, 0x8D, 0x94, 0x1E};
static const uint8_t uart_base_uuid_rev[] = {0x1E, 0x94, 0x8D, 0xF1, 0x48, 0x31, 0x94, 0xBA, 0x75, 0x4C, 0x3E, 0x50, 0, 0, 0x3D, 0x71};


uint8_t txPayload[TXRX_BUF_LEN] = {0,};
uint8_t rxPayload[TXRX_BUF_LEN] = {0,};

//static uint8_t rx_buf[TXRX_BUF_LEN];
//static uint8_t rx_len=0;


GattCharacteristic  txCharacteristic (uart_tx_uuid, txPayload, 1, TXRX_BUF_LEN, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE_WITHOUT_RESPONSE);
                                      
GattCharacteristic  rxCharacteristic (uart_rx_uuid, rxPayload, 1, TXRX_BUF_LEN, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY);
                                      
//GattCharacteristic *uartChars[] = {&txCharacteristic, &rxCharacteristic};

GattService         uartService(uart_base_uuid, uartChars, sizeof(uartChars) / sizeof(GattCharacteristic *));


void disconnectionCallback(Gap::Handle_t handle, Gap::DisconnectionReason_t reason)
{
    //pc.printf("Disconnected \r\n");
    //pc.printf("Restart advertising \r\n");
    ble.startAdvertising();
}

void WrittenHandler(const GattCharacteristicWriteCBParams *Handler)
{   
    uint8_t buf[TXRX_BUF_LEN];
    uint16_t bytesRead;
    
    if (Handler->charHandle == txCharacteristic.getValueAttribute().getHandle()) 
    {
        ble.readCharacteristicValue(txCharacteristic.getValueAttribute().getHandle(), buf, &bytesRead);
        memset(txPayload, 0, TXRX_BUF_LEN);
        memcpy(txPayload, buf, TXRX_BUF_LEN);       
        
        //for(index=0; index<bytesRead; index++)
            //pc.putc(buf[index]);
            
        if(buf[0] == COUPLING_SETTING) {  
            coupling_type = buf[1];
            if (coupling_type = AC_COUPLING) {
                AC_EN = 1;
                DC_EN = 0;
            } else // DC coupling
                AC_EN = 0;
                DC_EN = 1;
            }
        }
        else if(buf[0] == TRIGGER_DIR_SETTING) {
            trigger_dir = buf[1];
        }
        else if(buf[0] == AVERAGING_SETTING) {
            averaging_amount = buf[0];
        }
        else if(buf[0] == VOLTAGE_RANGE_SETTING)
        {
            voltage_range = buf[1];
            // i2c write to DAC here
        }
        else if(buf[0] == TIME_SHIFT_SETTING) {
            time_shift_value = buf[1];
        }
        else if(buf[0] == TIME_RANGE_SETTING) {
            time_range_value = buf[1];
        }
        else if(buf[0] == OFFSET_SETTING) {
            offset_value = buf[1];
            if (offset_value >= 0) { // postitive offset
                NEG_OFFSET_EN = 0;
                POS_OFFSET_EN = 1;
            } else { // negative offset
                NEG_OFFSET_EN = 1;
                POS_OFFSET_EN = 0;
            }
            // i2c write to DAC here 
        }

    }
}
/*
void uartCB(void)
{   
    while(pc.readable())    
    {
        rx_buf[rx_len++] = pc.getc();    
        if(rx_len>=20 || rx_buf[rx_len-1]=='\0' || rx_buf[rx_len-1]=='\n')
        {
            ble.updateCharacteristicValue(rxCharacteristic.getValueAttribute().getHandle(), rx_buf, rx_len); 
            pc.printf("RecHandler \r\n");
            pc.printf("Length: ");
            pc.putc(rx_len);
            pc.printf("\r\n");
            rx_len = 0;
            break;
        }
    }
}
*/


uint16_t index;
uint8_t voltage_buffer;

void m_status_check_handle(void)
{   
    uint8_t buf[3];
    if (analog_enabled)  // if analog reading enabled
    {
        // Read and send out
        float s = ANALOG;
        uint16_t value = s*1024; 
        buf[0] = (0x0B);
        buf[1] = (value >> 8);
        buf[2] = (value);
        ble.updateCharacteristicValue(rxCharacteristic.getValueAttribute().getHandle(), buf, 3); 
    }
}

int main(void)
{   
    Ticker ticker;
    ticker.attach_us(m_status_check_handle, 1000);
    
    ble.init();
    ble.onDisconnection(disconnectionCallback);
    ble.onDataWritten(WrittenHandler);  
    
    //pc.baud(9600);
    //pc.printf("SimpleChat Init \r\n");

    //pc.attach( uartCB , pc.RxIrq);
    
    // setup advertising 
    ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED);
    ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
    ble.accumulateAdvertisingPayload(GapAdvertisingData::SHORTENED_LOCAL_NAME,
                                    (const uint8_t *)"Serqet", sizeof("Serqet") - 1);
    ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_128BIT_SERVICE_IDS,
                                    (const uint8_t *)uart_base_uuid_rev, sizeof(uart_base_uuid));
    // 100ms; in multiples of 0.625ms. 
    ble.setAdvertisingInterval(160);

    ble.addService(uartService);
    
    ble.startAdvertising(); 
    
    //pc.printf("Advertising Start \r\n");
    
    while(1)
    {
        ble.waitForEvent(); 
    }
}