File content as of revision 2:5e9c4d83d038:

#include "mbed.h"
#include "LPC17xx.h"
#include "TextLCD.h"
#include "rtos.h"
#include "Thread.h"
using namespace rtos;

 
// This is for the pacemaker
volatile unsigned short timer_count;
Serial pc(USBTX, USBRX);
TextLCD lcd(p15, p16, p17, p18, p19, p20, TextLCD::LCD20x4); // rs, e, d4-d7


int h_clock;


// constants
int MAX_PM_RT = 180;
int MIN_PM_RT = 40;
enum mode {NORMAL, SLEEP, EXERCISE, MANUAL};

// counters
int beats = 0;

// state variables
int upper_bound = 100;
int lower_bound = 40;
int obs_int = 10;
mode curr_mode = NORMAL;



// alarms 
DigitalOut Apace(LED1);
DigitalOut Vpace(LED2);
DigitalOut Asense(LED3);
DigitalOut Vsense(LED4);

// hardware interrupt handler, adapted from code in piazza post by Dagaen
extern "C" void TIMER0_IRQHandler (void)
{
if((LPC_TIM0->IR & 0x01) == 0x01)   // if MR0 interrupt, proceed
    {
    LPC_TIM0->IR |= 1 << 0;         // Clear MR0 interrupt flag
    timer_count++;                  //increment timer_count
    }
}
 
// init the hardware interrupt (timer0), adapted same as above
void timer0_init(void)
{
    LPC_SC->PCONP |=1<1;            //timer0 power on
    LPC_SC-> PCLKSEL0 |= 1 << 2;    // set timer clock to CCLCK nondivided (1 clock cycle = 1 increment)
    LPC_TIM0->MR0 = 1000000;          //100mhz clock cycle, 1 cycle = 10ns, 10ms = 10 000 000 ns = 1M cycles
    LPC_TIM0->MCR = 3;              //interrupt and reset control
                                    //3 = Interrupt & reset timer0 on match (111) sets all three bits
    NVIC_EnableIRQ(TIMER0_IRQn);    //enable timer0 interrupt
}


void PM_ALARM(void const *argument){
    
    // min hr alarm
    if( beats < MIN_PM_RT){
        lcd.locate(0,1);
        lcd.printf("!<"); 
    }
      
    // max hr alarm
    if(beats > MAX_PM_RT){
        lcd.locate(0,1);
        lcd.printf("!>"); 
    }  
    
}

// hw interrupt callback, deal with the keyboard input from PC
void MODE_SWITCH() {
    
    // get the char, put it on the PC command line
    char a = pc.getc();

    // if the char is N, update bounds to normal mode
    if(a == 'N'){
        curr_mode = NORMAL;
        upper_bound = 100;
        lower_bound = 40;
        pc.printf("MODE IS N\n");  
    // if the char is S, set bounds to sleep
    }else if (a == 'S'){
        curr_mode = SLEEP;
        upper_bound = 60;
        lower_bound = 30;
        pc.printf("MODE IS S\n");  
    // if the char is E, set bounds to exercise
    }else if (a == 'E'){
        curr_mode = EXERCISE;
        upper_bound = 175;
        lower_bound = 100;
        pc.printf("MODE IS E\n");  
        beats = 2;
    // if the char is M, set to manual
    }else if (a == 'M'){
        curr_mode = MANUAL;
        upper_bound = 175;
        lower_bound = 30;
        beats = 300;
        pc.printf("MODE IS MANUAL\n");  
    // check for A if mode is manual
    }else if (a == 'A'){
        if(curr_mode == MANUAL){
            pc.printf("MODE IS MANUAL GOT APACE\n");  
        }
    // check for V is mode is manual  
    }else if (a == 'V'){
        if(curr_mode == MANUAL){
            pc.printf("MODE IS MANUAL GOT VPACE\n");   
        }  
    }else{
        // do nothing for invalid char
    }
    
    
}



void apace() {
    
}

void vpace() {
    
}

int main() {
    // connect the serial device (PC keybd) to the interrupt
    pc.attach(&MODE_SWITCH);
    
    //Thread t3(PM_ALARM);
}