MSPM0L1227: SYSCONFIG max ADC channel

Hello Holger,

The "12' you seen is the amount of the memory registers which are used for conversion results storage in the ADC. Each memory can be configurated with an input channel. This ADC has 21ch but 12 memory registers. It means that if you need to convert the input on 21 external channel, you need to configurate the input channel for the conversion results storage memory register manually after one sequence conversion completed. Please pay attention to distinguishing the concepts of " ADC channel" and "ADC conversion memory"

Best Regards,

Janz Bai

Hi Janz,
is there an example project for manual reconfiguration in our SDK?

Regards, Holger

Hello Holger,

I am sorry that we don't have this kind of example in SDK now. You can refter to the code generated in "ti_msp_dl_config.c" file when you set the channel for conversion memory in Sysconfig. 

For example, you configurate the conversion memory 0~11 to the channel 0~11, after the sequence conversion completed, you re-initialize the conversion memory channel (about the code, please refer to the code generated by Sysconfig when you configurate ADC conversion memory channel), you can just use conversion memory 0~8 for your channel 12~20 and don't use memory 9~11.

Best Regards,

Janz Bai

Hi Janz,

> This ADC has 21ch but 12 memory registers.
where is this limitation documented?

Regards, Holger

Hello Holger,

You can find it in the TRM: the Figure 14-1 ADC Block Diagram

Best Regards,

Janz Bai