ADS7038Q1EVM-PDK: ADS7038Q1EVM-PDK Manual Mode Help

Hello Nick,

When using manual mode, the MSB and LSB registers are not used. this is why you are reading the same value, because it is not being updated.

To read the measurement results, the channel ID is configured to the channel desired, and then two frames later, sized based on the output desired are provided. 

Cynthia, 

Are you saying I should see the values as soon as I send the next Write Channel Sel Address for a channel? 

Send CHannel 0 Req See Below 

Send Channel 1 Req and the returned bytes in Channel1 are ADC results of Channel 0?

Nick

Would I be able to read the registers in Auto-Sequence mode?

Init

Assuming I set All registers to 0xff in AUTO_SEQ_CH_SEL 

Set Seq Mode to Auto_SEQ

Periodic 

Set Seq Start Bit in Seq_Cfg Register 

Read All Channels Registers 

Stop Seq Seq_Start Bit 

It will take TWO frames after the initial channel select frame where the data should be available, Thus in the example you gave, it would be one more frame where the data for CH0 would be available. 

I don't fully understand your question.  In auto sequence mode, the ADC measurement results are not stored in a register, they are pushed out on SDO as frames are provided. 

If you are asking if you can read any register content while Auto sequence is on going, i believe you should be able to.

Regards

Cyntha

Cynthia, 

I am just looking to read the ADC values periodically through the registers. It looks like the auto sequencing mode is better suited for this. 

Could you confirm my logic below as it is still not working? 

Periodic 

Set Seq Start Bit in Seq_Cfg Register 

for loop to Read All Channels Registers 

Stop Seq Seq_Start Bit 

I am asking because after I start the conversion and try to get the data I just get back constant results in both modes.

Closing this thread, as this request is now addressed directly