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CCS/TMS320F28035: Toggling GPIO pins

Brandon Dyer
Intellectual 610 points
Part Number: TMS320F28035
Other Parts Discussed in Thread: C2000WARE

Tool/software: Code Composer Studio

I am trying to test four GPIO pins at the same time on TMS320F2835 using Code Composer Studio, and I was wondering if there is a way to manually change the pin values without writing specific code to do so.  Also, I have written a code to try and toggle the pins but haven't had any luck.  The code compiles and loads to the MCU just fine but is not making the LED's blink.  I have checked the GPADIR and it shows that all the bits are zero (all set to inputs).  I included my code at the end of the post.  Any help would be much appreciated.  Thank you.

#include "DSP28x_Project.h"
void main(void)
{
//
// Disable Protection
//
EALLOW;
//
// Make Port A GPIOs outputs
//
GpioCtrlRegs.GPADIR.all =0x01304000;
while(1)
{
//
// Toggle GPIOs 14,20,21,24
//
GpioDataRegs.GPADAT.all = 0x00000000;
DELAY_US(1000000);
GpioDataRegs.GPADAT.all = 0x01304000;
DELAY_US(1000000);
}
}

  • 0
    TI__Guru** 113745 points
    Hi Brandon,

    You can open register view in CCS and write into GPIO SET register (avoid DATA register) to toggle the pin HIGH or write into GPIO CLEAR register to toggle pin LOW. In your code you need to enable the clock for GPIO. You can call InitSysCtrl() function for the same. Please refer GPIO toggle example (gpio_toggle) in c2000Ware for this.

    Vivek Singh
  • 0 in reply to Vivek Singh
    Intellectual 610 points
    I finally got my LEDs to turn on and off using the code attached to the end of this reply. I step through the code during the debug session just fine (which I have to set the delay to a smaller value to do so). However, when I go to debug the code it always stops at the "EALLOW" command and will not run without me stepping through line by line. Also, when I load the program to the MCU, I don't see any change in the LEDs. Is there a way to check the code that is on the MCU and any additional steps needed to make sure the program loads and/or to make the debugger run without halting? I keep getting a message that reads "Suspended - SW Breakpoint" as well. Thank you.


    #include "DSP28x_Project.h"
    void main(void)
    {
    //
    // Disable Protection
    //
    EALLOW;
    //
    // Make Port A GPIOs outputs
    //
    GpioCtrlRegs.GPADIR.all = 0x01304000;
    GpioCtrlRegs.GPAPUD.all = 0x00000000;
    while(1)
    {
    //
    // Toggle GPIOs 14,20,21,24
    //
    GpioDataRegs.GPACLEAR.all=0x01304000;
    DELAY_US(1000000);
    GpioDataRegs.GPATOGGLE.all=0x01304000;
    DELAY_US(1000000);
    }
    }
  • 0 in reply to Brandon Dyer
    TI__Guru** 113745 points
    Brandon,

    Were you able to look at the example code I mentioned? You should take that example code and modify it as per your requirement.

    Vivek Singh
  • 0 in reply to Vivek Singh
    TI__Guru** 113745 points
    Closing the post. If your problem is not resolved, please re-open the post by providing more info or open a new post.