How to disable the GPIO pull-up for the TMS320F28335 processor using the embedded coder for Texas Instruments C2000 libraries

am unable to disable the internal pull-up for the GPIO7 of the TMS320F28335 using embedded coder for Texas Instruments C2000 libraries(ver: Matlab2011a,CCS V3.3).

Below is the auto code generated for GPIO as an input configuration.

      {
        /* Start for S-Function (c280xgpio_di): '<S38>/Digital Input' */
        EALLOW;
        GpioCtrlRegs.GPAPUD.all = 0U;
        GpioCtrlRegs.GPAMUX1.all &= 4294918143U;
        GpioCtrlRegs.GPADIR.all &= 4294967167U;
        EDIS;
      }

all bits of GPAPUB register is assigned to zero(pull-up enable). But, for the CAN pins(GPIO30,31) , pull-ups are handled pin wise. refer below code for the CAN pins.

    /* Configure CAN pins using GPIO regs */
    EALLOW;
    GpioCtrlRegs.GPAPUD.bit.GPIO30 = 0;  // Enable pull-up for GPIO30 (CANRXA)
    GpioCtrlRegs.GPAMUX2.bit.GPIO30 = 1; // Configure GPIO30 for CANRXA operation
    GpioCtrlRegs.GPAPUD.bit.GPIO31 = 0;  // Enable pull-up for GPIO31 (CANTXA)
    GpioCtrlRegs.GPAMUX2.bit.GPIO31 = 1; // Configure GPIO31 for CANTXA operation
    EDIS;

I hope there should be some work around to enable/disable the pull-up for the GPIO.

kirankumar.

[Fabian Tutschka]

For TI Concerto F28M35x/F28M36Mx processors it is possible to disable GPIO Pull-Up. Please have a look at topic "GPIO# Pull Up Disabled" in the following link:

https://www.mathworks.com/help/releases/R2015b/supportpkg/texasinstrumentsc2000concerto/ug/coder-target-pane-texas-instruments-concerto-f28m3x-arm-cortex-m3.html?searchHighlight=gpio%23%20pull%20up