I want to check analog input pins. I found analog input pins but how to check and what are the connections for that. We can use potentiometer to check analog inputs.And how can i check that?
Colibri Evaluation board has 4 ADC lines on X14 connector (pins 1,3,5,7 with corresponding analog ground on pins 2,4,6,8)
That lines go directly to Colibri pins 2,4,6,8.
From Colibri T20 datasheet
5.17 Analog Inputs The Wolfson WM9715 IC provides the 4 analogue input channels. Please consult the Wolfson WM9715 documentation for more information.
Table 5-23 Analog Inputs Pins
X1 Pin # Signal Name I/O Description Pin on the WM9715
2 AD3 Analogue Input ADC input (3.3V max).
This pin is also used in the 5-wire interface, see Touch Panel interface. 12
4 AD2 Analogue Input ADC input (5V max) 31
6 AD1 Analogue Input ADC input (3.3V max) 30
8 AD0 Analogue Input ADC input (3.3V max) 29
From High performance, low power Embedded Computing Systems | Toradex Developer Center
On the Colibri T20 the WM9715 supports ADC read-out through the battery driver. Currently only AD0 and AD1 are supported.
root@colibri_t20:~# cat /sys/class/power_supply/colibri_t20-analog_inputs/voltage_now
root@colibri_t20:~# cat /sys/class/power_supply/colibri_t20-analog_inputs/temp