4DCAPE-70T display blocks all analog inputs

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1

When the 4DCAPE-70T display is connected to BBB, ALL the analog inputs are made unavailable, even thought the 4DCAPE-70T documentation claims that only ain 0-3 are used.

The 4DCAPE-70T uses the same driver as the LCD7 Cape from Circuitco.

Has anyone figured out how to access the analog inputs 4, 5, 6 that are supposedly unused?

2

Hi,

Has anyone figured out how to access the analog inputs 4, 5, 6 that are
supposedly unused?

I am using the 4DCAPE-70T.

What do you have in /sys/devices/ocp.3/44e0d000.tscadc/tiadc/iio:device0 ?

I see:
in_voltage4_raw
in_voltage5_raw
in_voltage6_raw
in_voltage7_raw

Everytime I cat these files, their values change:

debian@hmi2:/sys/devices/ocp.3/44e0d000.tscadc/tiadc/iio:device0$ cat
in_voltage*
531
1472
2069
3812
debian@hmi2:/sys/devices/ocp.3/44e0d000.tscadc/tiadc/iio:device0$ cat
in_voltage*
448
1289
2067
3824

Cheers,

Alex

3

Hi,

if it claims to use the same driver as Circuitco, it will depends on which version.
The LCD7 rev A3 seems to use i2c, and rev A3 uses adc chanels 4-5-6-7 as per dts:
adc {
ti,adc-channels = <4 5 6 7>;
};

You should be able to use chans 0 to 3.

Cedric