Smart Alarm

#include "mbed.h"
#include "TextLCD.h"
#include "PinDetect.h"
#include "rtos.h"

Mutex stdio_mutex;
PinDetect pb1 (p20);
PinDetect pb2 (p19);
PinDetect pb3 (p18);
Serial pc(USBTX, USBRX);
TextLCD lcd(p22, p23, p24, p25, p26, p27); // create a global lcd object
DigitalOut latch(p15);
DigitalOut enable(p16);
PwmOut speaker (p21);
//Cycles through different colors on RGB LED
SPI spi(p11, p12, p13);
//Use SPI hardware to write color values to LED driver chip
float currseconds;
float currminutes;
float currhours;
float currtime = 28450;
bool pm = 0;
bool alarmpm;
bool lightswitch=1;    
float alarmtime = 28800;
float alarmhours;
float alarmminutes;
bool alarming = 0;
int alarmstate = 0;

//Declare the LCD and set up SPI communication
void RGB_LED(int red, int green, int blue) {
    unsigned int low_color=0;
    unsigned int high_color=0;
    high_color=(blue<<4)|((red&0x3C0)>>6);
    low_color=(((red&0x3F)<<10)|(green));
    spi.write(high_color);
    spi.write(low_color);
    latch=1;
    latch=0;
}


//Set up hour increment push button
void pb1_hit_callback (void){
    alarmtime+=3600;
}
//Set up minute increment push button    
void pb2_hit_callback (void){
    alarmtime+=60;
}

//Set up pushbutton to disable the alarm when ringing or toggle the light on/off when not    
void pb3_hit_callback (void){
    if (alarming == 1){
        speaker = 0.0;
        alarming =0;
        alarmstate = 1;
        }
    else lightswitch = !lightswitch;
    
}

//Thread running to check if the alarm should trigger
void alarm_trigger(void const *args) {
    alarmhours = floor(alarmtime/3600);
    alarmminutes = floor(fmod((alarmtime/60),60));
    while(1){
        if((alarmtime-currtime) <= 300 && (alarmtime-currtime) > 100){
            int red=50;
            int green=0;
            int blue=0;
            spi.format(16,0);
            spi.frequency(500000);
            enable=0;
            latch=0;
            alarmstate = 0;
            //Hard coded 5 minute light warm up prior to alarm ringing
            for (red = 0;red<50;red++){
                RGB_LED(red,green,blue);
                wait(2);
            }
            for (green = 0; green<50; green+=1) {
                RGB_LED( red, green, blue);
                wait(2);
            }
            for (blue = 0; blue<50;blue+=1){
                 RGB_LED(red,green,blue);
                 wait(2);
            }
        }
            
        if(alarmminutes == currminutes && alarmhours == currhours && alarmstate == 0){
                 alarming = 1;
        }
                
        
    }
}

//Thread running to determine the color of light dependant on time of day. no blue light after 7 pm and between alarm
void lights(void const *args) {
      spi.format(16,0);
      spi.frequency(500000);
      enable=0;
      latch=0;    
      int state=2;
      while(1){
           if((alarmtime-currtime) > 300 || (alarmtime-currtime) <=0){
               if (lightswitch == 1&& state !=1){
                   if(((currtime < alarmtime)||(currtime >= 68400)) && state != 1){
                       RGB_LED(50,24,0);
                       state = 1;}
                   else if ((currtime > alarmtime && currtime < 68400) && state !=2){
                       RGB_LED(50,50,50);
                       state = 2;}   
                }
               else if (lightswitch == 0 && state != 0){
                     stdio_mutex.lock();
                     RGB_LED(0,0,0);
                     state = 0;
                     stdio_mutex.unlock();
              }
           }
            
        Thread::wait(100); 
      }
}

//Triggers the speaker when the alarm is triggered
void alarm(void const *args) {
    while(1){
           if(alarming == 1){
                    
                    speaker.period(1.0/300);
                    stdio_mutex.lock();
                    speaker = .5;
                    stdio_mutex.unlock();
                    wait(.5);
                    stdio_mutex.lock();
                    speaker=0.0;
                    stdio_mutex.unlock();
                    wait(.5);
                }
    }
}
           
//Main thread. Time management, breaks down second counter to hours and minutes and prints to LCD    
int main() {
    wait(.2);
    Thread t2(alarm_trigger);
    Thread t3(lights);
    Thread t4(alarm);
    // Setup Interrupt callback functions for a pb hit
    pb1.attach_deasserted(&pb1_hit_callback);
    pb2.attach_deasserted(&pb2_hit_callback);
    pb3.attach_deasserted(&pb3_hit_callback);
    // Start sampling pb inputs using interrupts
    pb1.setSampleFrequency();
    pb2.setSampleFrequency();
    pb3.setSampleFrequency();
    // pushbuttons now setup and running


    speaker.period(1.0/300.0);
    pc.printf("Running");
    
    while (1){
        if (currtime > 86400) currtime = 0;
        currtime ++;
        if (currtime > 43200) pm = true;
        else pm = false;
        currhours = floor(currtime/3600);
        currseconds = floor(fmod(currtime,60));
        currminutes = floor(fmod((currtime/60),60));
        if (alarmtime >= 86400) alarmtime = alarmtime-86400;
        if (alarmtime >= 43200) alarmpm = true;
        else alarmpm = false;
        alarmhours = floor(alarmtime/3600);
        alarmminutes = floor(fmod((alarmtime/60),60));
        if (pm == false){
            if (currhours==0) currhours = 12;
            if (alarmpm == false){
                if (alarmhours==0) alarmhours = 12;
                lcd.cls();
                lcd.printf("%02.0f:%02.0f:%02.0f AM\n%02.0f:%02.0f AM", currhours,currminutes,currseconds,alarmhours,alarmminutes);
            }
            if (alarmpm == true){
                alarmhours = alarmhours - 12;
                if (alarmhours == 0) alarmhours = 12;
                lcd.cls();
                lcd.printf("%02.0f:%02.0f:%02.0f AM\n%02.0f:%02.0f PM", currhours,currminutes,currseconds,alarmhours,alarmminutes);
            }
        
        }
        if (pm == true){
            currhours = currhours - 12;
            if (currhours == 0) currhours = 12;
            if (alarmpm == false){
                if (alarmhours==0) alarmhours = 12;
                lcd.cls();
                lcd.printf("%02.0f:%02.0f:%02.0f PM\n%02.0f:0%2.0f AM", currhours,currminutes,currseconds,alarmhours,alarmminutes);
            }
            if (alarmpm == true){
                alarmhours = alarmhours - 12;
                if (alarmhours == 0) alarmhours = 12;
                lcd.cls();
                lcd.printf("%02.0f:%02.0f:%02.0f PM\n%02.0f:%02.0f PM", currhours,currminutes,currseconds,alarmhours,alarmminutes);
            }
        }


        wait(1);
        }
    
    
}