Vybrid MQX ADC0 and ADC1

[speterson]

Hi,

I am currently working with the Vybrid lwadc MQX example and am unable to get both ADC0 and ADC1 working.

The issue is that if BSPCFG_ENABLE_LWADC0 and BSPCFG_ENABLE_LWADC1 are defined non-zero in the BSP (user_config.h) that the interface enabled first will be overwritten by the second. Therefore if you have the following:

#define BSPCFG_ENABLE_LWADC0    1

#define BSPCFG_ENABLE_LWADC1    1

You will only be able to access the channels on ADC1 (ADC1SE0 through ADC1SE9) because the ADC1 initialization overwrites ADC0.

This appears to be a limitation of the driver, has anyone else seen this issue or working on a solution?

[rendy]

Hi Serah,

I can confirm this problem. I have contacted MQX team and waiting for their opinion. In the meantime I am trying to develop a workaround. If you have already developed your own, pls let me know.

Rene

[rendy]

I found the workaround, there is a problem with 'context_ptr' variable in the 'lwadc_vadc.c' file. I suppose you have the 4.0.1 version of MQX. Please ty to add correct initialization of this variable in all functions in this file, except the '_lwadc_init' function. The initialization expression is:

context_ptr = lwadc_ptr->context_ptr;

I expect this should be corrected in MQX versions higher than 4.0.1, but at this moment I can't confirm that with certainity. I've attached the updated file. It would be great if you could try the solution and provide the feedback here.

[rendy · Accepted solution]

I've consulted this issue with MQX team and it looks like the issue will be gone in next MQX release. It's version 4.1.0 and it will be available soon.

[karina_valencia]

juangutierrez can you  help on this case?