ADC voltage range of Ci20 and programming API

[Krishnakumar Gopalakrishnan]

Hi,

I wish to read the voltage from a Li-ion battery (2.5 to 4.2 V) using the built-in ADC.

What is the voltage range of this ADC peripheral? How many channels are available. is there a programming guide or spec sheet available from somewhere?

Regards,

Krishna

[MIPS Creator CI20]

Hi,

You can read AUX1 and AUX2 using sysfs in the latest Debian.

cat /sys/devices/platform/jz4780-adc/jz4740-hwmon.0/in0_input
cat /sys/devices/platform/jz4780-adc/jz4740-hwmon.0/in1_input

I'd recommend checking the ADC section of the programmers manual.
http://mipscreator.imgtec.com/CI20/hardware/soc/JZ4780_PM.pdf

I doubt it'll be able to sense above the 3.3v rail so you might have to translate that range to something
within the range.

Regards
ZubairLK