About beaglebone_pru_adc to read just one ADC port

From https://github.com/pgmmpk/beaglebone_pru_adc

Im install and follow instruction to make it read ADC value

But i cant read the value in single port it always read 8 ports (AIN 0-7)

I want to just read AIN 0 in 0-4095 range.