///////////////////////////////////
//
// program_7 project
//
// created 8/12/21 by tj
// rev 0
//
///////////////////////////////////
//
// Program to practice with interrupts and Ticker
//
// inputs: output of ticker isr (D4)
// outputs: D6 - square wave at T_WAIT/2 period
//
///////////////////////////////////

#include "mbed.h"
#include <stdio.h>                      // only needed when printing
#define T_OUT 500000us    // in us - 0.5sec
#define T_PRINT 100000  // in us - 0.1sec

// function prototypes
void ticker_isr(void);
void int_isr(void);

// Global HARDWARE Objects
// Create a Ticker object
Ticker my_ticker;
// Create an interruptIn object
InterruptIn int_in(D5);
// create the output from the ticker
DigitalOut ticker_out_pin(D4);
// create output from interrupt
DigitalOut int_out_pin(D6);

int main(void){
    setbuf(stdout, NULL);  // disable buffering when printing

    // splash 
    printf("\n\nprogram_7\n");
    printf("Using Mbed OS version %d.%d.%d\n\n", 
            MBED_MAJOR_VERSION, MBED_MINOR_VERSION, MBED_PATCH_VERSION);
    printf("Welcome to my structure program\n\n");
    
    // setup interrupts
    my_ticker.attach(&ticker_isr, T_OUT);
    int_in.fall(&int_isr);
    
    // initialize outputs
    ticker_out_pin.write(0);
    
    while(1){
        printf("%i\n", int_out_pin.read());
        wait_us(T_PRINT);

    }// end while
            
   return 0;
}// end main

void ticker_isr(void){
    ticker_out_pin.write(!ticker_out_pin.read());
    
    return;
}// enf ticker_isr

void int_isr(void){
    int_out_pin.write(!int_out_pin.read());
    
    return;
}// end int_isr