/*#############################################################

Program Name    : ex1_HC06_leds_b
Author          : Grant Phillips
Date Modified   : 17/09/2016
Compiler        : ARMmbed
Tested On       : STM32F4-Discovery

Description     : Example program that uses the STM32F4's USART 
                  module to establish a serial link via a HC-06 
                  Bluetooth module with another device.  If the 
                  STM32F4 receives the following messages:
                  "A"   -   ORANGE LED (LD3) ON
                  "B"   -   ORANGE LED (LD3) OFF
                  "C"   -   RED LED (LD5) ON
                  "D"   -   RED LED (LD5) OFF
                  "E"   -   BLUE LED (LD6) ON
                  "F"   -   BLUE LED (LD6) OFF
                  "G"   -   GREEN LED (LD4) ON
                  "H"   -   GREEN LED (LD4) OFF 

Requirements    : * STM32F4-Discovery Board
              
Circuit         : * 4 LEDs connected to PD15 - PD12 (LD6 - LD4
                    ON STM32F4-DISCOVERY BOARD)
                  * HC06 Bluetooth module is connected as follows:
                    TXD         -       PB7
                    RXD         -       PB6
                    GND         -       GND
                    VCC         -       3.3V

##############################################################*/

#include "mbed.h"

DigitalOut GreenLed(PD_12);
DigitalOut OrangeLed(PD_13);
DigitalOut RedLed(PD_14);
DigitalOut BlueLed(PD_15);

Serial bt(PB_6, PB_7);      //create a Serial object to connect to the HC06 Bluetooth module
//        tx  , rx 

char btmsg;                 //character variable to store incoming bt message
int new_btmsg = 0;          //flag to indicate if a new .message was received

//this interrupt routine is called when a new character is received
void btinterrupt() {    
    if(new_btmsg == 0)              //make sure previous message was handled first before fetching next instruction message
    {
        btmsg = bt.getc();          //read the incoming character
        new_btmsg = 1;              //set the flag to indicate that there is a new message
    }
}


int main() {
    bt.attach(&btinterrupt);        //if a new character arrives, call the interrupt service routine
    
    while(1) {
        if(new_btmsg) {             //check if there is a new message
            if(btmsg=='A')          //message for ORANGE LED (LD3) ON   
                OrangeLed  = 1;
            else if(btmsg=='B')     //message for ORANGE LED (LD3) OFF
                OrangeLed  = 0;
            else if(btmsg=='C')     //RED LED (LD5) ON
                RedLed  = 1;
            else if(btmsg=='D')     //RED LED (LD5) OFF
                RedLed  = 0;
            else if(btmsg=='E')     //BLUE LED (LD6) ON
                BlueLed = 1;
            else if(btmsg=='F')     //BLUE LED (LD6) OFF
                BlueLed = 0;
            else if(btmsg=='G')     //GREEN LED (LD4) ON
                GreenLed = 1;
            else if(btmsg=='H')     //GREEN LED (LD4) OFF
                GreenLed = 0;
            else
                bt.printf("Incorrect command\n");   //Reply incorrect command
                
            new_btmsg=0;                            //clear message flag
        }
    }
}