Spurious interrups from KEYADC

[StefanB]

During U-Boot startup I see the following message repeated

Code:

key pressed value=0x1

This is obviously caused by interrupts from the KEYADC. As far as I can see, this pin is left floating, but should likely be weakly (1..10 MOhm) pulled to GND.

I assume the purpose of this pin is to implement an R2R ladder input, like

http://hackaday.com/2012/03/02/r2r-ladde...e-adc-pin/

[tllim]

During U-Boot startup I see the following message repeated

Code:

key pressed value=0x1

This is obviously caused by interrupts from the KEYADC. As far as I can see, this pin is left floating, but should likely be weakly (1..10 MOhm) pulled to GND.

I assume the purpose of this pin is to implement an R2R ladder input, like

http://hackaday.com/2012/03/02/r2r-ladde...e-adc-pin/

Good catch, I will inform our Android software engineer to check out.

[clode10164]

this is true on the ic ALLWINNER A64 MAIL IC it is the PIN A16 which is an analog input with 6bit resolution
in the documentation : http://files.pine64.org/doc/datasheet/pi...t_V1.1.pdf
look at page 8 and 9