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CCS/TMS570LS1224: 12V Pull Up GPIOA Open Drain output don't operate.

Son Howon
Prodigy 10 points
Part Number: TMS570LS1224
Other Parts Discussed in Thread: LAUNCHXL2-TMS57012

Tool/software: Code Composer Studio

Hi

12V Pull Up GPIOA7 open drain does not work.

gioInit() source is

void gioInit(void)
{
/* USER CODE BEGIN (2) */
/* USER CODE END */

    /** bring GIO module out of reset */
    gioREG->GCR0   = 1U;
    gioREG->ENACLR = 0xFFU;
    gioREG->LVLCLR = 0xFFU;

    /** @b initialize @b Port @b A */

    /** - Port A output values */
    gioPORTA->DOUT = (uint32)((uint32)0U << 0U)  /* Bit 0 */
                   | (uint32)((uint32)0U << 1U)  /* Bit 1 */
                   | (uint32)((uint32)0U << 2U)  /* Bit 2 */
                   | (uint32)((uint32)0U << 3U)  /* Bit 3 */
                   | (uint32)((uint32)0U << 4U)  /* Bit 4 */
                   | (uint32)((uint32)0U << 5U)  /* Bit 5 */
                   | (uint32)((uint32)0U << 6U)  /* Bit 6 */
                   | (uint32)((uint32)1U << 7U); /* Bit 7 */

    /** - Port A direction */
    gioPORTA->DIR  = (uint32)((uint32)1U << 0U)  /* Bit 0 */
                   | (uint32)((uint32)0U << 1U)  /* Bit 1 */
                   | (uint32)((uint32)1U << 2U)  /* Bit 2 */
                   | (uint32)((uint32)0U << 3U)  /* Bit 3 */
                   | (uint32)((uint32)0U << 4U)  /* Bit 4 */
                   | (uint32)((uint32)0U << 5U)  /* Bit 5 */
                   | (uint32)((uint32)1U << 6U)  /* Bit 6 */
                   | (uint32)((uint32)1U << 7U); /* Bit 7 */

    /** - Port A open drain enable */
    gioPORTA->PDR  = (uint32)((uint32)0U << 0U)  /* Bit 0 */
                   | (uint32)((uint32)0U << 1U)  /* Bit 1 */
                   | (uint32)((uint32)0U << 2U)  /* Bit 2 */
                   | (uint32)((uint32)0U << 3U)  /* Bit 3 */
                   | (uint32)((uint32)0U << 4U)  /* Bit 4 */
                   | (uint32)((uint32)0U << 5U)  /* Bit 5 */
                   | (uint32)((uint32)0U << 6U)  /* Bit 6 */
                   | (uint32)((uint32)1U << 7U); /* Bit 7 */

    /** - Port A pullup / pulldown selection */
    gioPORTA->PSL  = (uint32)((uint32)0U << 0U)  /* Bit 0 */
                   | (uint32)((uint32)0U << 1U)  /* Bit 1 */
                   | (uint32)((uint32)0U << 2U)  /* Bit 2 */
                   | (uint32)((uint32)0U << 3U)  /* Bit 3 */
                   | (uint32)((uint32)0U << 4U)  /* Bit 4 */
                   | (uint32)((uint32)0U << 5U)  /* Bit 5 */
                   | (uint32)((uint32)0U << 6U)  /* Bit 6 */
                   | (uint32)((uint32)0U << 7U); /* Bit 7 */

    /** - Port A pullup / pulldown enable*/
    gioPORTA->PULDIS  = (uint32)((uint32)0U << 0U)  /* Bit 0 */
                      | (uint32)((uint32)0U << 1U)  /* Bit 1 */
                      | (uint32)((uint32)0U << 2U)  /* Bit 2 */
                      | (uint32)((uint32)0U << 3U)  /* Bit 3 */
                      | (uint32)((uint32)0U << 4U)  /* Bit 4 */
                      | (uint32)((uint32)0U << 5U)  /* Bit 5 */
                      | (uint32)((uint32)0U << 6U)  /* Bit 6 */
                      | (uint32)((uint32)0U << 7U); /* Bit 7 */

    /** @b initialize @b Port @b B */

    /** - Port B output values */
    gioPORTB->DOUT = (uint32)((uint32)1U << 0U)  /* Bit 0 */
                   | (uint32)((uint32)1U << 1U)  /* Bit 1 */
                   | (uint32)((uint32)1U << 2U)  /* Bit 2 */
                   | (uint32)((uint32)1U << 3U)  /* Bit 3 */
                   | (uint32)((uint32)0U << 4U)  /* Bit 4 */
                   | (uint32)((uint32)0U << 5U)  /* Bit 5 */
                   | (uint32)((uint32)0U << 6U)  /* Bit 6 */
                   | (uint32)((uint32)0U << 7U); /* Bit 7 */

    /** - Port B direction */
    gioPORTB->DIR  = (uint32)((uint32)1U << 0U)  /* Bit 0 */
                   | (uint32)((uint32)1U << 1U)  /* Bit 1 */
                   | (uint32)((uint32)1U << 2U)  /* Bit 2 */
                   | (uint32)((uint32)1U << 3U)  /* Bit 3 */
                   | (uint32)((uint32)0U << 4U)  /* Bit 4 */
                   | (uint32)((uint32)0U << 5U)  /* Bit 5 */
                   | (uint32)((uint32)0U << 6U)  /* Bit 6 */
                   | (uint32)((uint32)0U << 7U); /* Bit 7 */

    /** - Port B open drain enable */
    gioPORTB->PDR  = (uint32)((uint32)0U << 0U)  /* Bit 0 */
                   | (uint32)((uint32)0U << 1U)  /* Bit 1 */
                   | (uint32)((uint32)0U << 2U)  /* Bit 2 */
                   | (uint32)((uint32)0U << 3U)  /* Bit 3 */
                   | (uint32)((uint32)0U << 4U)  /* Bit 4 */
                   | (uint32)((uint32)0U << 5U)  /* Bit 5 */
                   | (uint32)((uint32)0U << 6U)  /* Bit 6 */
                   | (uint32)((uint32)0U << 7U); /* Bit 7 */

    /** - Port B pullup / pulldown selection */
    gioPORTB->PSL  = (uint32)((uint32)0U << 0U)  /* Bit 0 */
                   | (uint32)((uint32)0U << 1U)  /* Bit 1 */
                   | (uint32)((uint32)0U << 2U)  /* Bit 2 */
                   | (uint32)((uint32)0U << 3U)  /* Bit 3 */
                   | (uint32)((uint32)0U << 4U)  /* Bit 4 */
                   | (uint32)((uint32)0U << 5U)  /* Bit 5 */
                   | (uint32)((uint32)0U << 6U)  /* Bit 6 */
                   | (uint32)((uint32)0U << 7U); /* Bit 7 */

    /** - Port B pullup / pulldown enable*/
    gioPORTB->PULDIS  = (uint32)((uint32)0U << 0U) /* Bit 0 */
                      | (uint32)((uint32)0U << 1U)  /* Bit 1 */
                      | (uint32)((uint32)0U << 2U)  /* Bit 2 */
                      | (uint32)((uint32)0U << 3U)  /* Bit 3 */
                      | (uint32)((uint32)0U << 4U)  /* Bit 4 */
                      | (uint32)((uint32)0U << 5U)  /* Bit 5 */
                      | (uint32)((uint32)0U << 6U)  /* Bit 6 */
                      | (uint32)((uint32)0U << 7U); /* Bit 7 */

/* USER CODE BEGIN (3) */
/* USER CODE END */

    /** @b initialize @b interrupts */

    /** - interrupt polarity */
    gioREG->POL = (uint32)((uint32)0U << 0U)   /* Bit 0 */
                | (uint32)((uint32)0U << 1U)   /* Bit 1 */
                | (uint32)((uint32)0U << 2U)   /* Bit 2 */
                | (uint32)((uint32)0U << 3U)   /* Bit 3 */
                | (uint32)((uint32)0U << 4U)   /* Bit 4 */
                | (uint32)((uint32)0U << 5U)   /* Bit 5 */
                | (uint32)((uint32)0U << 6U)   /* Bit 6 */
                | (uint32)((uint32)0U << 7U)   /* Bit 7 */
                | (uint32)((uint32)0U << 8U)   /* Bit 8  */
                | (uint32)((uint32)0U << 9U)   /* Bit 9  */
                | (uint32)((uint32)0U << 10U)  /* Bit 10 */
                | (uint32)((uint32)0U << 11U)  /* Bit 11 */
                | (uint32)((uint32)0U << 12U)  /* Bit 12 */
                | (uint32)((uint32)0U << 13U)  /* Bit 13 */
                | (uint32)((uint32)0U << 14U)  /* Bit 14 */
                | (uint32)((uint32)0U << 15U); /* Bit 15 */


    /** - interrupt level */
    gioREG->LVLSET = (uint32)((uint32)0U << 0U)   /* Bit 0 */
                   | (uint32)((uint32)0U << 1U)   /* Bit 1 */
                   | (uint32)((uint32)0U << 2U)   /* Bit 2 */
                   | (uint32)((uint32)0U << 3U)   /* Bit 3 */
                   | (uint32)((uint32)0U << 4U)   /* Bit 4 */
                   | (uint32)((uint32)0U << 5U)   /* Bit 5 */
                   | (uint32)((uint32)0U << 6U)   /* Bit 6 */
                   | (uint32)((uint32)0U << 7U)   /* Bit 7 */
                   | (uint32)((uint32)0U << 8U)   /* Bit 8  */
                   | (uint32)((uint32)0U << 9U)   /* Bit 9  */
                   | (uint32)((uint32)0U << 10U)  /* Bit 10 */
                   | (uint32)((uint32)0U << 11U)  /* Bit 11 */
                   | (uint32)((uint32)0U << 12U)  /* Bit 12 */
                   | (uint32)((uint32)0U << 13U)  /* Bit 13 */
                   | (uint32)((uint32)0U << 14U)  /* Bit 14 */
                   | (uint32)((uint32)0U << 15U); /* Bit 15 */


    /** - clear all pending interrupts */
    gioREG->FLG = 0xFFU;

    /** - enable interrupts */
    gioREG->ENASET = (uint32)((uint32)0U << 0U)   /* Bit 0 */
                   | (uint32)((uint32)1U << 1U)   /* Bit 1 */
                   | (uint32)((uint32)0U << 2U)   /* Bit 2 */
                   | (uint32)((uint32)0U << 3U)   /* Bit 3 */
                   | (uint32)((uint32)0U << 4U)   /* Bit 4 */
                   | (uint32)((uint32)1U << 5U)   /* Bit 5 */
                   | (uint32)((uint32)0U << 6U)   /* Bit 6 */
                   | (uint32)((uint32)0U << 7U)   /* Bit 7 */
                   | (uint32)((uint32)0U << 8U)   /* Bit 8  */
                   | (uint32)((uint32)0U << 9U)   /* Bit 9  */
                   | (uint32)((uint32)0U << 10U)  /* Bit 10 */
                   | (uint32)((uint32)0U << 11U)  /* Bit 11 */
                   | (uint32)((uint32)0U << 12U)  /* Bit 12 */
                   | (uint32)((uint32)0U << 13U)  /* Bit 13 */
                   | (uint32)((uint32)0U << 14U)  /* Bit 14 */
                   | (uint32)((uint32)0U << 15U); /* Bit 15 */

/* USER CODE BEGIN (4) */
/* USER CODE END */
}

gioSetBit(gioPORTA, 7, 0);  // output is 0V

delay(1000);

gioSetBit(gioPORTA, 7, 1);  // output is 4V (12V Pull Up 1k ohm Res)

delay(1000);

I want to know. 12V does not come out.

please answer about my question.

  • 0
    TI__Mastermind 21425 points
    Hi,
    Could you give more information about your hardware set-up. Are you using development kit or custom board? As I see you have external pull-up connected to 12V. Are you connecting this resistor to GIOA7 or to external circuitry switched by GIOA7? If you are pulling-up GIOA7 to 12V you can damage the device. If you are switching external circuitry , GIOA7 should be pulled up to I/O supply voltage (3.0 to 3.6V) with external pull-up resistor.

    I tried your settings in my Development Kit (LAUNCHXL2-TMS57012) with 1k pull-up resistor to 3V3 and output is working as expected.

    Regards,
    Miro
  • 0 in reply to Miro
    TI__Guru**** 197306 points
    Hello,

    The maximum voltage to a GPIO pin is 4.6V and the recommended the operating voltage is 3.3V. As Miro said applying 12V to the pin without a voltage divider will damage the pin.