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MSP432E401Y: GPIO pin of PORTD PD7 Pin not able to drive the LED.

naga narasimha
Prodigy 170 points
Part Number: MSP432E401Y

Dear Team,

I am using PD7 as GPIO output pin to drive the LED. 

1. I  am MSP432E401Y SDK and after studying TRM  i got to know that  PD7 pin  is locked.

2. How to unlock the register using GPIO driver API calls.

Regards,

Naga Narasimha Rao

  • 0
    TI__Guru*** 128255 points

    Hello Naga,

    Try the following and see if that works.

    1) Include Header files:

    #include "ti/devices/msp432e4/driverlib/inc/hw_types.h"
#include "ti/devices/msp432e4/driverlib/inc/hw_gpio.h"
#include "ti/devices/msp432e4/driverlib/inc/hw_memmap.h"

    Step 2) Use the following code:

    HWREG(GPIO_PORTD_AHB_BASE+GPIO_O_LOCK) = GPIO_LOCK_KEY;
HWREG(GPIO_PORTD_AHB_BASE+GPIO_O_CR) |= GPIO_PIN_7;

    Best Regards,

    Ralph Jacobi

  • 0 in reply to Ralph Jacobi
    Prodigy 170 points

    Dear Ralph Jacobi,

      Thanks for your reply. as of you told above to include Header files.

    1. I did not find below two files in below path and I got  error file not found.

    #include "ti/devices/msp432e4/driverlib/inc/hw_types.h"
    #include "ti/devices/msp432e4/driverlib/inc/hw_memmap.h"

    2. I tried below code which is suggested by TI and when i run the below code. Control is going to default handler.

    // first we unlock
    HWREG(GPIO_PORTD_BASE + GPIO_O_LOCK)= GPIO_LOCK_KEY; // UNLOCK

    HWREG(GPIO_PORTD_BASE + GPIO_O_CR) |= 0x80); // write to commit register
    // HWREG(GPIO_PORTD_BASE + GPIO_O_AFSEL)&= ~0x80; // disable alternate function
    // HWREG(GPIO_PORTD_BASE + GPIO_O_DEN)|= 0x80; // enable digital driver
    HWREG(GPIO_PORTD_BASE + GPIO_O_LOCK)= 0; // lock pin

    Regards,

    Naga Narasimha Rao P

  • 0 in reply to naga narasimha
    TI__Guru*** 128255 points

    Hello Naga,

    I'm looking into this further.

    Best Regards,

    Ralph Jacobi

  • 0 in reply to naga narasimha
    TI__Guru*** 128255 points

    Hello Naga,

    naga narasimha said:
    2. I tried below code which is suggested by TI and when i run the below code. Control is going to default handler.

    Have you enabled the GPIO first? See below. If you try and unlock the port before you enable the GPIO, it will cause a fault.

    MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);

    From what I am seeing based on the gpio_jtag example, the following should be possible to use:

                GPIOD->LOCK = GPIO_LOCK_KEY;
            GPIOD->CR = 0x80;
            GPIOD->AFSEL &= 0xf7;
            GPIOD->LOCK = GPIO_LOCK_KEY;
            GPIOD->CR = 0x00;
            GPIOD->LOCK = 0;

    If that doesn't work I have another solution lined up which should work, but I wanted to stick with what MSP432E4 SDK typically uses.

    Best Regards,

    Ralph Jacobi