File content as of revision 25:89979f4ccfa9:

#include "mbed.h"
#include "USBHID.h"

// Virtual serial port over USB TODO NEW VID PID NEEDED!!
USBHID hid(64, 64);

//This report will contain data to be sent
HID_REPORT send_report;
HID_REPORT recv_report;

//debug port setup
Serial pc(P3_0, P3_1);

// I2C setup
I2C i2c(P1_6, P1_7);            // P1_6 -> I2C1_SDA,  P1_7-> I2C1_SCL

//Timer setup
Ticker timer_1;                 // timer for blinking led heartbeat
bool led_toggle_flag = false;

//LED  blink setup
DigitalOut rLED(LED1);
DigitalOut gLED(LED2);
DigitalOut bLED(LED3);

//InterruptIn button(SW1);

void LED_blink_callback() { // LED Heart beat

    led_toggle_flag = !led_toggle_flag;

    if (led_toggle_flag)
    {
        //toggle teal leds
        //gLED = LED_ON;
        bLED = LED_ON;
    }
    else
    {
        rLED = LED_OFF;
        gLED = LED_OFF;
        bLED = LED_OFF;
    }

}

// *****************************************************************************
//   I2C_write_register(char, char, char)  writes single byte to OT07
//                       char   I2C address
//                       char   OT07 register address
//                       char   data byte to be writen
//   returns                    0 on success ACK, 1 on NACK 
// *****************************************************************************

int I2C_write_register(char I2C_add, char reg_add, char byte) {
    char data[2];
    int error;
    data[0] = reg_add;
    data[1] = byte;
    error = i2c.write(I2C_add, data, 2);
    return error;

}

/// ****************************************************************************
//   I2C_write_register(char, char, char *, int)  writes multiple bytes to OT07
//                       char   I2C address
//                       char   OT07 register address
//                       char * data vector of bytes to be written
//                       int    number of bytes to write
//   returns                    0 on success ACK, 1 on NACK 
// *****************************************************************************

int I2C_write_register(char I2C_add, char reg_add, char *bytes, int n) {
    int i;
    //set start address
    char data[16];
    int error;
    data[0] = reg_add;
    for (i = 1; i <= n; i++) {
        data[i] = bytes[i - 1];
    }
    error = i2c.write(I2C_add, data, n + 1);  // send n bytes of data

    return error;
}

// *****************************************************************************
//   I2C_read_register(char, char, char *, int)  writes single byte to OT07
//                       char   I2C address
//                       char   OT07 register address
//                       char * data vector for read bytes to be stored in 
//                       int    number of bytes to read
//   returns                    0 on success, 1 on fail 
// *****************************************************************************

int I2C_read_register(char I2C_add, char reg_add, char *bytes, int n) {
    int error;
    error = i2c.write(I2C_add, &reg_add, 1, 1);
    if (error)return error;
    error = i2c.read(I2C_add, bytes, n);
    //if(DEBUG)db.printf("rr e[%d]\r\n",error);
    return error;
}

//******************************************************************************
//        main()
//******************************************************************************

int main()
{
    pc.baud(9600);

    //************* init ticker timer callbacks  ****************
    timer_1.attach(&LED_blink_callback, 0.5);     //start ticker, once per  sec.      

    i2c.frequency(400000);      //set I2C clock to 400kHz     

    rLED = LED_OFF;
    gLED = LED_ON;
    bLED = LED_ON;

    send_report.length = 8;
    pc.printf("<HID_TEST_FW>\r\n");
    
    
 
    while (1) {
        pc.printf("Entered while loop\r\n");
        //Fill the report
        for (int i = 0; i < send_report.length; i++) {
            send_report.data[i] = rand() & 0xff;
        }
            
        //Send the report
        hid.send(&send_report);
        printf("Report Sent!\r\n");
        
        //try to read a msg
        if(hid.readNB(&recv_report)) {
            pc.printf("recv: ");
            for(int i = 0; i < recv_report.length; i++) {
                pc.printf("%d ", recv_report.data[i]);
            }
            pc.printf("\r\n");
        }
        
        wait(0.1);
    }
}