Objective Development Forums

Posted: **Fri Dec 07, 2012 6:09 pm**

Hi,
i read this tutorial: http://codeandlife.com/2012/01/22/avr-a ... al-part-1/ , and the same author wrote a How-To for making an USB-Keyboard via the HID-class, which worked wonderful for me

Now i´m wondering how to get the output of my ADC to a joystick-axis recognized in the windows "USB- and Gamecontrollers"-dialogue... Thanks in advance,

Slot

Posted: **Sat Dec 08, 2012 4:41 am**

Its a bit to get used to but not too hard. This is using the ADC's on an atmega 168/328

Code: Select all

//voltage reader.
#define ADC_VREF_TYPE 0x40
static int read_adc(unsigned char adc_input)
{
   ADMUX=adc_input|ADC_VREF_TYPE;
    _delay_us(150);
    ADCSRA|=0x40; // Start the AD conversion
    while ((ADCSRA & 0x10)==0);// Wait for complete
    ADCSRA|=0x10;
    return ADCW;
}

the init would be

Code: Select all

   ADMUX=0x1;//ADC init
   ADCSRA=0x83;

and you would read in to a report like so - natural your math will be different.

Code: Select all

      reportBuffer[1]= (read_adc(0)/3 + 200);//pc0
      reportBuffer[2]= (read_adc(1)/3 + 200)*-1;//pc1

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Joystick-axis

Joystick-axis

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