File content as of revision 1:c573caf40864:

#include "mbed.h"

//DigitalIn trigger(p22);
//DigitalOut transmit(p28);

DigitalIn tl(p17); //change to correct board
DigitalIn tr(p18);
DigitalIn bl(p19);
DigitalIn br(p20);

Serial device(p28,p27);  //tx,rx

BusOut myleds(LED4, LED3, LED2, LED1);

int buffer[4];
int temp1;

int row;
int columns;

char array[4];
char matrix[2][2];
int i;
int j;

void Array();
void Matrix();

int main()
{

    myleds = 0;

    device.baud(19200);
    buffer[0] = 1;
    buffer[1] = 0;
    buffer[2] = 1;
    buffer[3] = 0;
//    buffer[4] = 0;
//    buffer[5] = 0;
//    buffer[6] = 1;
//    buffer[7] = 0;

    array[0] = 0;
    array[1] = 0;
    array[2] = 0;
    array[3] = 0;

    while(1) {

        if (tl > 0) {
            myleds = 1;
        } else {
            myleds = 0;
        }

        //Array();

        Matrix();

        device.putc(1);
        for (int i=0; i<2; i++) {
            for (int j=0; j<2; j++) {

                //device.printf("%i",buffer[i]);

                //device.putc(buffer[i]);
                device.putc(matrix[i][j]);
            }
        }
        //wait(1);
    }

}

void Array()
{
    for(i=0; i<=1 ; i=i+1) {
        if (i == 0) {
            if (tl > 0) {
                array[0] = 1;
            } else {
                array[0] = 0;
            }
        } else if (i == 1) {
            if (tr > 0) {
                array[1] = 1;
            } else {
                array[1] = 0;
            }
        }
    }
    for(i=0; i<=1 ; i=i+1) {
        if (i == 0) {
            if (bl > 0) {
                array[2] = 1;
            } else {
                array[2] = 0;
            }
        } else if (i == 1) {
            if (br > 0) {
                array[3] = 1;
            } else {
                array[3] = 0;
            }
        }
    }
    /*
    for (row=0; row<2; row++) {
        for(columns=0; columns<2; columns++) {
            printf("%d     ", array[row][columns]);
        }
        printf("\n");
    }*/
    //printf("\n");
}

void Matrix()
{

    if (tl > 0) {
        matrix[0][0] = 1;
    } else {
        matrix[0][0] = 0;
    }
    if (tr > 0) {
        matrix[0][1] = 1;
    } else {
        matrix[0][1] = 0;
    }
    if (bl > 0) {
        matrix[1][0] = 1;
    } else {
        matrix[1][0] = 0;
    }
    if (br > 0) {
        matrix[1][1] = 1;
    } else {
        matrix[1][1] = 0;
    }

}