disable adc channels while reconfiguring

[oclyke]

Addresses #131

[nseidle]

I can't get the analog example to work on this PR but master works. I'm testing on ATP with trimpot, A29. What's your test setup?

[oclyke]

@paulvha I am also seeing the same results. The addition of am_hal_adc_disable in the ap3_change_channel routine appears to prevent the ADC from operating correctly.

Have you tested the changes that you suggest in #131? If so can you tell from the diffs of this PR what the culprit may be?

Without taking more time to dive into this I can't tell what exactly the issue is. Perhaps ADC startup time?

[paulvha]

I have tested both and left it in my code work correctly. Let me try to do a pull request and sent an update. I used this on couple of different ADC lines.

[paulvha]

Hi Owen,

I have reviewed but it is missing a couple of things. I can not create a pull request to handle, Attached, I hope, the ap3_analog_cpp in the zip. Search on PVH (in capitals) and you will find the places to change ( 7 lines of info)
ap3_analog.zip

regards,
Paul

[oclyke]

@paulvha the error in the original PR was that the method used to correctly set the interrupt mask (am_hal_adc_interrupt_status) only looked for interrupt flags enabled in the HAL layer. Changing this option to return any interrupt flag solved the problem. I'm going to merge these changes now.

Thanks a ton for your contribution!