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TMS320F280025: convert 2 lines of code from DriverLib mode to Bit Field / Register-Level Mode

Quentin Fu
Intellectual 770 points
Part Number: TMS320F280025
Other Parts Discussed in Thread: C2000WARE

Tool/software:

Hello,

I have 2 lines of code written in DriverLib mode, as shown below:

    GPIO_setPinConfig(GPIO_4_GPIO4);
    GPIO_writePin(4,0);

If they are re-written in  Bit Field / Register-Level Mode, what will they be?

Thanks!

  • 0
    Intellectual 770 points

    The lines below are written in DriverLib mode:

         GPIO_setPinConfig(GPIO_4_GPIO4);
         GPIO_setPinConfig(GPIO_5_GPIO5);
         GPIO_setPinConfig(GPIO_6_GPIO6);
         GPIO_setPinConfig(GPIO_7_GPIO7);
         GPIO_writePin(4,0);
         GPIO_writePin(5,0);
         GPIO_writePin(6,0);
         GPIO_writePin(7,0);

    I  converted the lines above to Register Mode by using HWREGH macro, but they do NOT work the same way at the lines above:

          EALLOW;
          // Configure GPIO4–GPIO7 as GPIOs (Clear corresponding bits in GPAMUX1)
          HWREGH(0x00007C42) &= ~(0xFF << 8); // Clear bits 15-8 (GPIO4–GPIO7)

          // Set GPIO4–GPIO7 as outputs (Set bits 4–7 in GPADIR)
          HWREGH(0x00007C4A) |= (0xF << 4); // Set bits 4–7
          EDIS;

          // Set GPIO4–GPIO7 output to LOW (Clear bits 4–7 in GPACLEAR)
          HWREGH(0x00007C2A) = (0xF << 4);

    Please advise what the equivalent Bit Field / Register-Level Mode code are.   Thanks!

  • 0 in reply to Quentin Fu
    Intellectual 770 points

    Is there an application note or article that provides step-by-step guidance on converting DriverLib code to Bit Field code?

  • 0 in reply to Quentin Fu
    TI__Intellectual 1680 points

    Hello,

    Here is how I would suggest to write on a specific GPIO:

    //
    // Enable an GPIO output on GPIO6, set it high
    //
    GpioCtrlRegs.GPAPUD.bit.GPIO6 = 0; // Enable pullup on GPIO6
    GpioDataRegs.GPASET.bit.GPIO6 = 1; // Load output latch
    GpioCtrlRegs.GPAMUX1.bit.GPIO6 = 0; // GPIO6 = GPIO6
    GpioCtrlRegs.GPADIR.bit.GPIO6 = 1; // GPIO6 = output

    You can refer to C2000ware for C2000Warexx\device_support\f28002x\examples\gpio to find some examples.

    Best Regards,

    Masoud

  • 0 in reply to Masoud Farhadi
    Intellectual 770 points

    Thanks. Please see below:

    1. Is there an application note or article that provides step-by-step guidance on converting DriverLib code to Bit Field code?
    2. How to convert the lines below to Bit field mode so that GPIO4 & 5 & 6 & 7 are SIMULTANEOUSLY set to 0?

         GPIO_setPinConfig(GPIO_4_GPIO4);
         GPIO_setPinConfig(GPIO_5_GPIO5);
         GPIO_setPinConfig(GPIO_6_GPIO6);
         GPIO_setPinConfig(GPIO_7_GPIO7);
         GPIO_writePin(4,0);
         GPIO_writePin(5,0);
         GPIO_writePin(6,0);
         GPIO_writePin(7,0);

  • 0 in reply to Quentin Fu
    TI__Prodigy 110 points

    Hello Quentin,

    To answer your first question, we unfortunately do not have any application notes or articles that cover DriverLib to Bit Field code conversion. However, you can include and use both DriverLib and Bit Field code in the same file to take advantage of both APIs. For more info for setting this approach up, see Section 2.3 in the file located at C:/ti/c2000/C2000Ware_<version>/device_support/f28002x/docs/F28002x_FRM_EX_UG.pdf

    In order to convert your DriverLib code to the Bit Field code you are requesting, I would advise using the GpioCtrlRegs.GPAxxx.all approach. See the code below:

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    // Enable pullup on GPIO 4-7
    GpioCtrlRegs.GPAPUD.all &= ~((1 << 4) | (1 << 5) | (1 << 6) | (1 << 7));
    // Clear Data Regs for GPIO 4-7
    GpioDataRegs.GPACLEAR.all |= (1 << 4) | (1 << 5) | (1 << 6) | (1 << 7);
    // Set up mux for GPIO 4-7 and set GPIO 4-7 to output
    GpioCtrlRegs.GPAMUX1.all |= (1 << 4) | (1 << 5) | (1 << 6) | (1 << 7);
    GpioCtrlRegs.GPADIR.all |= (1 << 4) | (1 << 5) | (1 << 6) | (1 << 7);
    XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

    Best,

    Ryan