ADC Free Running

When configuring the ADC in Free Running mode, the next conversion starts immediately after the previous one completes. To activate this mode, the FREERUN bit in the ADC0.CTRLA must be set in addition to the normal ADC initialization.

ADC0.CTRLA |= ADC_FREERUN_bm;

The ADC conversion is started by setting the STCONV bit in the ADC0.COMMAND register:

ADC0.COMMAND = ADC_STCONV_bm;

Then the ADC results can be read in a while loop:

while(1)
{
    if (ADC0_conersionDone())
    {
        adcVal = ADC0_read();
    }
}