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CCS/LAUNCHXL-F280049C: LAUNCHXL-F280049C cmpss not working

Sumit Ranjan Chakraborty
Prodigy 80 points
Part Number: LAUNCHXL-F280049C
Other Parts Discussed in Thread: C2000WARE, TMS320F280049C

Tool/software: Code Composer Studio

I was trying the "cmpss_ex2_digital_filter" example project. Only changed the debugger to "XDS110". I was providing 3.3V on ADCINB6 pin. As per the instructions I should see high on GPIO14. But it's always zero. Do I have to change any board configuration via switch?

  • 0
    TI__Mastermind 28275 points

    Hi Sumit,

    Was the setup working before you changed the debugger to "XDS110"?

  • 0 in reply to Frank Ankapong
    Prodigy 80 points

    I couldn't test. As the board I'm working with comes with an on-board XDS110 debugger. 

    I was trying the project from "ti\c2000\C2000Ware_3_02_00_00\driverlib\f28004x\examples\cmpss" folder as it's for tms320f280049c MCU. But the project with a targetConfigs in TMS320F280049C.ccxml file for XDS100. So, to flash the target I had to change the settings. hrpwm project works fine. But it's not working as instructed.  I'm quoting below what is told in that project to do.

    // FILE:   cmpss_ex2_digital_filter.c
//
// TITLE:  CMPSS Digital Filter Configuration
//
//! \addtogroup driver_example_list
//! <h1> CMPSS Digital Filter Configuration </h1>
//!
//! This example enables the CMPSS1 COMPH comparator and feeds the output
//! through the digital filter to the GPIO14/OUTPUTXBAR3 pin.
//!
//! CMPIN1P is used to give positive input and internal DAC is configured
//! to provide the negative input. Internal DAC is configured to provide a
//! signal at VDD/2.
//!
//! When a low input(VSS) is provided to CMPIN1P,
//!     - GPIO14 output is low
//!
//! When a high input(higher than VDD/2) is provided to CMPIN1P,
//!     - GPIO14 output turns high
//!
//! \b External \b Connections \n
//!  - Give input on CMPIN1P (The pin is shared with ADCINB6)
//!  - Output can be observed on GPIO14
//!
//! \b Watch \b Variables \n
//!  - None
//!

  • 0 in reply to Sumit Ranjan Chakraborty
    TI__Mastermind 28275 points

    Sumit,

    I just tried this on the launchpad and it's working. Please make sure you have the jumper connected to J7 pin 63. You can also look at the CMPSS status registers to see if it goes from 0 to 1 as you change the pin from low to high.

  • 0 in reply to Frank Ankapong
    Prodigy 80 points

    Frank,

    1. I have tried connecting pin63 of J7. It's not working.

     2. I think it should be pin 64 of J7. I have also tried that previously.

    3. In that example project I can see COMPSTS as an invalid register. 

  • 0 in reply to Sumit Ranjan Chakraborty
    Prodigy 80 points

    Frank,

    I've got the issue. It doesn't work if 3.3V/GND is used as signal at ADCINB6. If the voltage is changed by potentiometer then it works fine. Is impedence an issue? 

    Late Edit:

    I'm getting expected output using 3.3V/GND now also after it worked for the first time. I'm in dark on what the issue was.

  • 0 in reply to Sumit Ranjan Chakraborty
    Prodigy 80 points

    Finally realized what was the issue. 
    I was trying one of DAB projects. That project sets up board protection using cmpss with some tripping mechanism. 
    That configuration was not being cleared when I flashed the example. 
    I changed the setting to flash in FLASH memory instead of RAM and added configuration to reset after flash.
    Now it's all working fine.

  • 0 in reply to Sumit Ranjan Chakraborty
    TI__Mastermind 28275 points

    Glad to hear it's working now! Let us know if you ran into anymore issues.