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

Program Name    : ex1_HC06_leds
Author          : Grant Phillips
Date Modified   : 12/05/2016
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:
                  "OrangeON"     -   ORANGE LED (LD3) ON
                  "OrangeOFF"    -   ORANGE LED (LD3) OFF
                  "RedON"        -   RED LED (LD5) ON
                  "RedOFF"       -   RED LED (LD5) OFF
                  "BlueON"       -   BLUE LED (LD6) ON
                  "BlueOFF"      -   BLUE LED (LD6) OFF
                  "GreenON"      -   GREEN LED (LD4) ON
                  "GreenOFF"     -   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[50];             //incoming message string
int btmsg_counter = 0;      //character position counter in the message string
int new_btmsg = 0;          //flag to indicate if a new complete message was received

//this interrupt routine is called when a new character is received
void btinterrupt() {    
    char c;
    
    c = bt.getc();                              //read the incoming character
    if(c == '\n') {                             //if it is the terminating character
        if(btmsg[btmsg_counter - 1] == '\r')
            btmsg[btmsg_counter - 1] = '\0';
        else
            btmsg[btmsg_counter] = '\0';
        new_btmsg = 1;                          //enable the new message flag to indicate a COMPLETE message was received
        btmsg_counter = 0;                      //clear the message string
    }
    else {
        btmsg[btmsg_counter] = c;               //add the character to the message string
        btmsg_counter++;                        //move to the next character in the string
    }   
}


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(strcmp(btmsg, "OrangeON") == 0)              //message for ORANGE LED (LD3) ON
                OrangeLed  = 1;
            else if(strcmp(btmsg, "OrangeOFF") == 0)        //message for ORANGE LED (LD3) OFF
                OrangeLed  = 0;
            else if(strcmp(btmsg, "RedON") == 0)            //RED LED (LD5) ON
                RedLed  = 1;
            else if(strcmp(btmsg, "RedOFF") == 0)           //RED LED (LD5) OFF
                RedLed  = 0;
            else if(strcmp(btmsg, "BlueON") == 0)           //BLUE LED (LD6) ON
                BlueLed = 1;
            else if(strcmp(btmsg, "BlueOFF") == 0)          //BLUE LED (LD6) OFF
                BlueLed = 0;
            else if(strcmp(btmsg, "GreenON") == 0)          //GREEN LED (LD4) ON
                GreenLed = 1;
            else if(strcmp(btmsg, "GreenOFF") == 0)         //GREEN LED (LD4) OFF
                GreenLed = 0;
            else
                bt.printf("Incorrect command\n");           //Reply incorrect command
                
            new_btmsg=0;                                    //clear message flag
        }
    }
}