MIMXRT1060 Unable To Toggle GPIO port 1, pin 10 - Arduino D5

[spanou]

Board: MIMXRT1060 

I am using the LED Blinky Example to toggle GPIO port 1, pin 10 (IOMUXC_GPIO_AD_B0_10_GPIO1_IO10). According to the schematic this should correspond to pin D5 of the Arduino shield. I've confirmed I can toggle all the pins of the Arduino D Port except D5. I don't see any zero ohm resistors anywhere in the schematic so I am not sure what is going on. 

Any ideas will be greatly appreciated. Thanks very much in advance.

The changes I am making to the original example are (whole project also attached as blinky.tar.bz2): 

source/led_blinky.c

/*
 * Copyright 2019 NXP
 * All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include "board.h"

#include "pin_mux.h"
#include "system_MIMXRT1062.h"
#include "clock_config.h"
/*******************************************************************************
 * Definitions
 ******************************************************************************/
#define EXAMPLE_LED_GPIO     BOARD_USER_LED_GPIO
#define EXAMPLE_LED_GPIO_PIN BOARD_USER_LED_PIN
#define ARDUINO_D5			 10U


/*******************************************************************************
 * Prototypes
 ******************************************************************************/

/*******************************************************************************
 * Variables
 ******************************************************************************/
volatile uint32_t g_systickCounter;
/* The PIN status */
volatile bool g_pinSet = false;

/*******************************************************************************
 * Code
 ******************************************************************************/
void SysTick_Handler(void)
{
    if (g_systickCounter != 0U)
    {
        g_systickCounter--;
    }
}

void SysTick_DelayTicks(uint32_t n)
{
    g_systickCounter = n;
    while (g_systickCounter != 0U)
    {
    }
}

/*!
 * @brief Main function
 */
int main(void)
{
    /* Board pin init */
    BOARD_InitPins();
    BOARD_InitBootClocks();
    /* Update the core clock */
    SystemCoreClockUpdate();

    /* Set systick reload value to generate 1ms interrupt */
    if (SysTick_Config(SystemCoreClock / 1000U))
    {
        while (1)
        {
        }
    }

    while (1)
    {
        /* Delay 1000 ms */
        SysTick_DelayTicks(1000U);
        if (g_pinSet)
        {
            GPIO_PinWrite(EXAMPLE_LED_GPIO, ARDUINO_D5, 0U);
            g_pinSet = false;
        }
        else
        {
            GPIO_PinWrite(EXAMPLE_LED_GPIO, ARDUINO_D5, 1U);
            g_pinSet = true;
        }
    }
}

 board/pin_mux.c

/*
 * Copyright 2019-2020 NXP
 * All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

/***********************************************************************************************************************
 * This file was generated by the MCUXpresso Config Tools. Any manual edits made to this file
 * will be overwritten if the respective MCUXpresso Config Tools is used to update this file.
 **********************************************************************************************************************/

/*
 * TEXT BELOW IS USED AS SETTING FOR TOOLS *************************************
!!GlobalInfo
product: Pins v7.0
processor: MIMXRT1062xxxxA
package_id: MIMXRT1062DVL6A
mcu_data: ksdk2_0
processor_version: 0.7.9
board: MIMXRT1060-EVK
pin_labels:
- {pin_num: F14, pin_signal: GPIO_AD_B0_09, label: 'JTAG_TDI/J21[5]/ENET_RST/J22[5]/USER_LED', identifier: USER_LED}
 * BE CAREFUL MODIFYING THIS COMMENT - IT IS YAML SETTINGS FOR TOOLS ***********
 */

#include "fsl_common.h"
#include "fsl_iomuxc.h"
#include "fsl_gpio.h"
#include "pin_mux.h"

/* FUNCTION ************************************************************************************************************
 * 
 * Function Name : BOARD_InitBootPins
 * Description   : Calls initialization functions.
 * 
 * END ****************************************************************************************************************/
void BOARD_InitBootPins(void) {
    BOARD_InitPins();
}

/*
 * TEXT BELOW IS USED AS SETTING FOR TOOLS *************************************
BOARD_InitPins:
- options: {callFromInitBoot: 'true', prefix: BOARD_, coreID: core0, enableClock: 'true'}
- pin_list:
  - {pin_num: F14, peripheral: GPIO1, signal: 'gpio_io, 09', pin_signal: GPIO_AD_B0_09, direction: OUTPUT, hysteresis_enable: Disable, pull_up_down_config: Pull_Down_100K_Ohm,
    pull_keeper_select: Keeper, pull_keeper_enable: Enable, open_drain: Disable, speed: MHZ_100, drive_strength: R0_6, slew_rate: Slow}
  - {pin_num: G13, peripheral: ARM, signal: arm_trace_swo, pin_signal: GPIO_AD_B0_10, slew_rate: Fast}
 * BE CAREFUL MODIFYING THIS COMMENT - IT IS YAML SETTINGS FOR TOOLS ***********
 */

/* FUNCTION ************************************************************************************************************
 *
 * Function Name : BOARD_InitPins
 * Description   : Configures pin routing and optionally pin electrical features.
 *
 * END ****************************************************************************************************************/
void BOARD_InitPins(void) {
  CLOCK_EnableClock(kCLOCK_Iomuxc);           /* iomuxc clock (iomuxc_clk_enable): 0x03U */

  /* GPIO configuration of USER_LED on GPIO_AD_B0_09 (pin F14) */
  gpio_pin_config_t USER_LED_config = {
      .direction = kGPIO_DigitalOutput,
      .outputLogic = 0U,
      .interruptMode = kGPIO_NoIntmode
  };
  /* Initialize GPIO functionality on GPIO_AD_B0_09 (pin F14) */
  GPIO_PinInit(GPIO1, 10U, &USER_LED_config);

  IOMUXC_SetPinMux(
	IOMUXC_GPIO_AD_B0_10_GPIO1_IO10,
//      IOMUXC_GPIO_AD_B0_09_GPIO1_IO09,        /* GPIO_AD_B0_09 is configured as GPIO1_IO09 */
      0U);                                    /* Software Input On Field: Input Path is determined by functionality */
  IOMUXC_SetPinMux(
      IOMUXC_GPIO_AD_B0_10_ARM_TRACE_SWO,     /* GPIO_AD_B0_10 is configured as ARM_TRACE_SWO */
      0U);                                    /* Software Input On Field: Input Path is determined by functionality */
  IOMUXC_GPR->GPR26 = ((IOMUXC_GPR->GPR26 &
    (~(IOMUXC_GPR_GPR26_GPIO_MUX1_GPIO_SEL_MASK))) /* Mask bits to zero which are setting */
      | IOMUXC_GPR_GPR26_GPIO_MUX1_GPIO_SEL(0x00U) /* GPIO1 and GPIO6 share same IO MUX function, GPIO_MUX1 selects one GPIO function: 0x00U */
    );
  IOMUXC_SetPinConfig(
        IOMUXC_GPIO_AD_B0_10_GPIO1_IO10,
//      IOMUXC_GPIO_AD_B0_09_GPIO1_IO09,        /* GPIO_AD_B0_09 PAD functional properties : */
      0x10B0U);                               /* Slew Rate Field: Slow Slew Rate
                                                 Drive Strength Field: R0/6
                                                 Speed Field: medium(100MHz)
                                                 Open Drain Enable Field: Open Drain Disabled
                                                 Pull / Keep Enable Field: Pull/Keeper Enabled
                                                 Pull / Keep Select Field: Keeper
                                                 Pull Up / Down Config. Field: 100K Ohm Pull Down
                                                 Hyst. Enable Field: Hysteresis Disabled */
  IOMUXC_SetPinConfig(
      IOMUXC_GPIO_AD_B0_10_ARM_TRACE_SWO,     /* GPIO_AD_B0_10 PAD functional properties : */
      0x90B1U);                               /* Slew Rate Field: Fast Slew Rate
                                                 Drive Strength Field: R0/6
                                                 Speed Field: medium(100MHz)
                                                 Open Drain Enable Field: Open Drain Disabled
                                                 Pull / Keep Enable Field: Pull/Keeper Enabled
                                                 Pull / Keep Select Field: Keeper
                                                 Pull Up / Down Config. Field: 100K Ohm Pull Up
                                                 Hyst. Enable Field: Hysteresis Disabled */
}

/***********************************************************************************************************************
 * EOF
 **********************************************************************************************************************/

Thanks,

Sakis

[spanou]

@mjbcswitzerland , thank you so much for taking the time to look at this. You are absolutely correct, the configuration of: 

IOMUXC_GPIO_AD_B0_10_ARM_TRACE_SWO, was effectively overriding the previous IOMUX setting, I spectacularly failed to see the connection between them. 

As an FYI, I was running ZephyrOS on the board, configuring all the Arduino D port pins as outputs, I was seeing the same issue there. So to narrow down the problem, I just hacked the led blinky example to remove all other dependencies. I suspect even in the Zephyr Config the same/similar issue is also in effect.  

Once again, thanks for looking into it. 

Regards,
Sakis

[mjbcswitzerland · Accepted solution]

Hi

Is it possible that

  IOMUXC_SetPinMux(
      IOMUXC_GPIO_AD_B0_10_ARM_TRACE_SWO,     /* GPIO_AD_B0_10 is configured as ARM_TRACE_SWO */
      0U);

 sets the pin to its ARM_TRACE_SWO (ALT 9) function rather than as GPIO (ALT 5)?
See https://www.utasker.com/iMX/iMXRT1060/iMX_RT_1060.xls

It also looks like you are configuring the same pin's characteristics twice.

Here's the equivalent setup in the uTasker project:

#define ARDUINO_D5   PIN_GPIO_AD_B0_10_GPIO1_IO10
void BOARD_InitPins(void)
{
    _CONFIG_DRIVE_PORT_OUTPUT_VALUE(1, (ARDUINO_D5), (0), (PORT_SRE_FAST | PORT_DSE_HIGH));
}

which is "hugely" less error prone than manually modifying the original config tool generated code!

Regards

Mark