File content as of revision 7:c81c6968f013:

#include "mbed.h"
#include "convert.h"

Serial pc(USBTX, USBRX);

AnalogIn my_light_sensor(PTE22);
AnalogIn my_analog_pin(PTB0);
// false == on; true == off for the leds
DigitalOut myled(LED_GREEN);
DigitalOut redled(LED_RED);
Timer timer;

//initialize variables
Ticker ticker;
char t1_string[31];
char t4_string[31];
int t2;
int t3;
int i = 0;
bool pulse_value = false;
float let_there_be_light = 0.0;
float my_analog_value = 0.0;
Convert lcd;
bool read_complete = false;

int tick_count = 0;

void systick() {
    if (tick_count % 10 == 0) {
        redled = true;
        // set the pulse high for 100ms, .1 s        
        // toggle a led
        pulse_value = true;
        myled = pulse_value;
        
        // get data from the (2) light sensor (3) analog pin
        let_there_be_light = my_light_sensor.read();
        my_analog_value = my_analog_pin.read();
            
        // print the analog values to uart
        //pc.printf("%f,%f\r\n", let_there_be_light, my_analog_value);
        
        // display 1
        //lcd.display(1);
                //wait_ms(100.0f);
    }
    else if (tick_count % 10 == 1) {
        redled = false;
        // set the pulse low for 900 ms, .9 s
        // toggle a led
        pulse_value = false;
        myled = pulse_value; // toggle a led
        
        // get data from the (2) light sensor (3) analog pin
        let_there_be_light = my_light_sensor.read();
        my_analog_value = my_analog_pin.read();
        
        // print the analog values to uart
        //pc.printf("%f,%f\r\n", let_there_be_light, my_analog_value);
        
        // display 0
        //lcd.display(0);
                //wait_ms(900.0f);
    }
    else if (tick_count % 30 == 0) {
        //pc.printf("\r\n\r\n GOT A STRING: %s\r\n\r\n", t1_string);
    }
    tick_count++;
}

int main()
{   
    timer.start();
    //initialize hardware
    ticker.attach_us(&systick, 100000);
    pc.baud(115200);
   
    
    t1_string[30] = '\0';
    
    //we start the program
    pc.printf("Hello World!\n");
    
    while (true) 
    {
        char c = pc.getc();
        t2 = timer.read_us();
        // make sure we've gotten an 's', which we are using as
        // the sync message. If we get an 's' then t2 is correct.
        if (c != 's') {
            continue;
        }
        while (c != '\n') {
            if (i == 30) {
                break;
            }
            t1_string[i] = c;
            c = pc.getc();
            i++;
        }
        t1_string[i] = '\0';
        i = 0;
        char display_time[5];
        display_time[0] = t1_string[4];
        display_time[1] = t1_string[5];
        display_time[2] = t1_string[7];
        display_time[3] = t1_string[8];
        display_time[4] = '\0';
        int display_time_int = atoi(display_time);
        lcd.display(display_time_int);
        //lcd.display(t1_string[7]);
        read_complete = true;
        
        t3 = timer.read_us();
        // sending the delay_req message at time t3
        pc.putc('r');
        
        // get the t4 packet
        while (c != '\n') {
            if (i == 30) {
                break;
            }
            t4_string[i] = c;
            c = pc.getc();
            i++;
        }
        t4_string[i] = '\0';
        i = 0;
    }
}