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LAUNCHXL-F28379D: About ADC Result Registers of C2000 Microprocessor

user5265880
Prodigy 110 points
Part Number: LAUNCHXL-F28379D
Hello Everyone ,
I have basic problem about c2000 ADC. I know , data can be read adc result registers .(ADCRESULT0,1,2,3….15)
But my PIL( processor in the loop application) I wanted to manipulate(write) adcresult register(writable?) , I want to write 2040 value adcresult0 register in simulation , adc does not read the actual plant or connnection to the pin(I don’t want to apply external 3.3V top in ) , adc only read the simulation data from constant block(2040). In order to implement this , I used memory map block . For example I assigned the write value as 2040 and write to 0B00 address of adcresult0(because adc information is taken from adcin0)
ADC Informations:
Memory Block
I wrote 2040 value to ADCIN0 register(ADCRESULT0 register = 0B00
But I did not see 2040 value of the ADC output of the PIL(my processor in the loop simulation)
Finally ,
1-Can anyone explain are ADCRESULT registers writable or controllable from externally without any hardware ,(for example I don’t want to apply 3.3V ADCIN0 pin, this pin only changeable via simulation ? )
2-Is this 0B00 addresses correct for manipulate the ADCRESULT0 (ADCIN0) register? ( If first question false, this is insignificant. )
I really appreciate it if someone can help me in these regards. Thanks in advance for your answers.
Burak
ADCRESULT REGISTERS ACCORDING TO TMR
NOTE: I wrote same question to Matlab forums. 
  • 0
    TI__Guru 61235 points

    user5265880,

    The ADCRESULT registers are read only.  You cannot write to them.  This is documented in the TRM, where the register is listed as being of type "R".  For example, from SPRUHM8I:

    Regards,

    David

  • 0 in reply to David M. Alter
    TI__Guru* 77230 points

    As David said the ADC result registers are read only, so the Simulink tools won't be able to inject your constant value that way.  For the purpose of debugging your system, I think you could just re-map where the results are fetched to match the memory where you've placed your constant(or other data).

    I suppose another method would be to abstract your control calculations externally to the PIL block and feed the values in there.  

    In either case you could still set up the ADC as it would be your system, just to have the ADC Interrupts/EOCs for triggering/timing reasons.

    Best,

    Matthew

  • 0 in reply to MatthewPate
    Prodigy 110 points

    Hi David and Matthew , 

    Thank you for your answers and helps. Actually I want to mention about my problem more general.

    I want to make PIL implementation using Matlab C2000 embedded coder

    I successfully read EPWM value duty cycle(cmpa and time counter value ) according to this value I generated PWM on simulation beside on the Launchpad pin using EPWM . No problem here.

    But I realized that there is no any input of the ADC block . According to PIL application voltage is getting from the voltage divider of plant circuit like a buck converter etc. But ADC block only accept the value via pin of the launchpad or microcontrollers.

    For this reason I didn’t get the voltage value  from the voltage divider circuit and insert it to ADC block. I want to implement this condition . I don’t want modeling a ADC block using matlab blocks , I want to use  C2000 ADC block in order to analyze as if real value getting from voltage divider and  adc makes  sample,hold,quantization processes like a real application. 

    This is successfully  done  by  PLECS  like following figures;

    You could see the simulation values(sensed values)   enter the ADC block.

    The inside of the adc block as follows;

    This is an ADC type the way i want it to use my matlab PIL application(processor in the loop) . But  as I mentioned above   


    The ADC block  does not have no inputs in MATLAB like an ADC block have inputs as in the PLECS.

     

    I  don’t want to use PLECS because of the PIL modeling and out file creating difficulties(need to design some codes using code composer studio)

    Compared to PLECS, Matlab out file generation and interface more simpler.

     


    1-Do you have any works on this topic on your side((texas ınstruments )?

    2-Are there any methods you can suggest?(I know you suggested some methods , but again I ask to you , you maybe give  more general informations about this)

    3- Will there be an improvement in this issue in the  matlab c2000 embedded coder infrastructure in the coming years?

    Thanks in Advance .

  • 0 in reply to user5265880
    TI__Guru* 77230 points

    I'm going to ask someone to comment from the MW team; they should know the constraints/capabilities of the PIL blocks more completely than I do.

    Best,

    Matthew

  • 0 in reply to user5265880
    Mastermind 6460 points

    Hi,

    Our blocks that are shipped with C2000 support package are code-gen only.  You cannot simulate these blocks to behave like a ADC peripheral.

    Our ADC blocks always read the digital value as converted by the ADC peripheral of the MCU. So you need to code-gen to get these blocks to work either through external mode or as standalone.

    We do have a project called SoC blockset that ship simulation ADC blocks.

    https://in.mathworks.com/help/supportpkg/tic2000soc/setup-and-configuration-1.html

    But you need a separate license for the same.

    You can also explore the use of variants to switch between codegen and simulation.

    One of our Motor control blockset shipping example as this option. You can refer the same.

    mcb_pmsm_foc_f28379d_dyno

    https://in.mathworks.com/help/mcb/gs/dual-motor-dyno-control-for-pmsm.html

    HTH