STM CircleOS forum / Restoring touchscreen functions when using ADC

slimphony · 2009-06-05 12:28:52

When reconfiguring the ADC to meet one's own requirements, the CircleOS ADC configuration is overwritten and as a nasty consequence the touchscreen no longer works.

In order to get it back to work with minimum effort, I had planned to restore the CircleOS ADC config and fill the ADC_ConvertedValue buffer from my application.

However the ADC_ConvertedValue is not published in the CircleOS API.

Is there a simple way to access this CircleOS variable ?

Or is it necessary to modify CircleOS ?

Francis · 2009-06-05 14:51:33

No, the only link between CircleOS and the applications is the set of functions (entry points) provided by the API. However, you could try to read the configuration of the ADC/DMA directly in the registers you modify (you would just have to restore these values). "ADC_ConvertedValue" should be available in the DMA registers... (you can check by opening , in the debugger, the view of the DMA peripheral).

slimphony · 2009-06-05 15:41:34

Correct! I can read the value from the register.

I was thinking of writing a small additional function in CircleOS util.c which would have been indeed impossible to use without an entry point... -I guess I'm Windows-biased

Once more, a big THANK YOU Francis!

# 1 2009-06-05 12:28:52 Restoring touchscreen functions when using ADC

Restoring touchscreen functions when using ADC

# 2 2009-06-05 14:51:33 Restoring touchscreen functions when using ADC

Re: Restoring touchscreen functions when using ADC

# 3 2009-06-05 15:41:34 Restoring touchscreen functions when using ADC

Re: Restoring touchscreen functions when using ADC

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