MATLAB Answers

Solomon
2

TI C2000 Delfino Multichannel ADC read using Simulink

Asked by Solomon
on 24 May 2016
Latest activity Answered by Adnan Ishtay on 25 Jul 2017
Hello all,
I'm trying to read different ADC values from two different channels of ADC-A using Simulink, however, one channel always seems to "copy" the value of the other. I'm using the F28377S Delfino Launchpad with a simple Simulink model: ADC-A1 and ADC-A2 each connected to a display block, 12 bit resolution, with all parameters same for both channels except for the SOC sources. I have a potentiometer connected to each pin. Both the ADCs are outputting the value from one of the potentiometers while the other potentiometer does not seem to have any affect on the ADCs.
I'm supposing I'll have to use ePWM blocks to trigger the two channels at different times, but I do not know how to execute this. Any help would be much appreciated.
Thanks!

  3 Comments

Is there any example how to use multiple ADC blocks in the model for the same board?
Hello,
I'm having the same problem as Solomon. I have multiple ADC blocks on my model and there are several channels that are reading the same signal. I have tried using Software and ePWM_ADCSOC for SOC trigger but the problem stills the same.
I would really appreciate any idea to solve this. Thanks
I'm having the same problem too. ADC_A0 and ADC_A1 read exactly the same signal although their inputs are different.

Sign in to comment.

4 Answers

Answer by Adnan Ishtay on 25 Jul 2017

OHHHH, finally... I have solved the problem, after understanding the basic structure and the operation of ADC module (go to:https://www.mathworks.com/help/supportpkg/texasinstrumentsc2000/ug/configuring-acquisition-window-width-for-adc-blocks.html), the default settings of ADC block in simulink library is set to the maximum ADC-sampling speed, which is trade-off with number of scanned channels for each port (ADC-A or ADC-B), by increasing the access-time of ADC conversion, this is done by the following settings: 1- as stated above by "Nail on 23 Dec 2016", go to Model [Configuration Parameters -> ADC_A -> ADC clock prescaler (ADCCLK)], I have put it to 8. 2- double click on "ADC-F2837xS" block in simulink file, and put the "SOCx acquisition window" to large value (I have put it to 64).

  0 Comments

Sign in to comment.


Answer by Nail
on 23 Dec 2016

I have changed ADCCLK value from 1.0 to 4.0 from
Model Configuration Parameters -> ADC_A -> ADC clock prescaler (ADCCLK)
and it worked.

  1 Comment

I just like to read more than two ADC input values to calibrate the controller parameters in real-time, I can read one ADC 12-bit value only from each different ports ADC-A and ADC-B, but when I am trying to read more than one channel from any port it is duplicated or disturbed. however, I have tried to "Model Configuration Parameters -> ADC_A -> ADC clock prescaler (ADCCLK)" but it does not work... can anybody help please?

Sign in to comment.


Answer by nasimullah khattak on 9 Jun 2017

Hello every body.I want to run ADCIN2 and synchronize it with Epwm2 of TI launchpad F20377S in the simulink environment. It seems that the ADC block collects only one sample and then it stops working. Can any body share a demo ,on how to configure it. Thanks

  0 Comments

Sign in to comment.


Answer by Muhammed Adel on 6 Jul 2017

Please help me i have the same problem on the same kit :(

  0 Comments

Sign in to comment.