GPIO P1.02 on nRF54L15 doesn't work.

RE: GPIO P1.02 on nRF54L15 doesn't work.

Kazi Afroza Sultana — Thu, 11 Sep 2025 19:10:17 GMT

I am glad that you have solved the issue. 🙂

RE: GPIO P1.02 on nRF54L15 doesn't work.

shibuta — Thu, 11 Sep 2025 02:32:57 GMT

Hi.

I saw the problem with a custom board first, which no other peripheral assigned as P1.02.
Backing to my application, I missed the assignment of P1.02 as &led1 and &led0.
Fixing it, I confirmed the GPIO function with my application.

Thanks.

RE: GPIO P1.02 on nRF54L15 doesn't work.

Kazi Afroza Sultana — Tue, 09 Sep 2025 13:16:37 GMT

Hello,

Is this your custom board? Is any other peripheral assigned as the same pin as P1.02? Somewhere in the project is LED0 defined as other pin number?

If you want can share me the application file or at least the board file of your application?

RE: GPIO P1.02 on nRF54L15 doesn't work.

shibuta — Tue, 09 Sep 2025 02:11:11 GMT

Hi.

Your explanatiom seemes correct too.
But, I could confirm with minimum configuration project based on a blinky sample project.
I altered the blinky project to add

CONFIG_NFCT_PINS_AS_GPIOS=y

in prj.conf and

&led0 {
	gpios = <&gpio1 2 0>;
};

&uicr {
    nfct-pins-as-gpios;
};

in devicetree.overlay

But, I couldn't confirm with quoted one.

[quote userid="135839" url="~/f/nordic-q-a/124217/gpio-p1-02-on-nrf54l15-doesn-t-work/548012"]'ll put prj.conf in my application below.[/quote]

I'll put two hex file, the minimum(blinky based) and current application .

minimum

devzone.nordicsemi.com/.../6232.merged.hex

current app (prj.conf and overlay in first comment)

devzone.nordicsemi.com/.../2526.app.hex

Would you tell me anything to help
(For example, the output file of port assignment,
the comparison between minimum and app) ?

Best regards.

RE: GPIO P1.02 on nRF54L15 doesn't work.

Kazi Afroza Sultana — Mon, 08 Sep 2025 13:05:20 GMT

Hello,

Your approach seems correct. I think you need to rework on hardware also. On the board you are using, R21 and R22 should not be connected; and R33 and R34 must be shorted with 0 ohm resistors.

This will physically reassign the pins from NFC to GPIO.

source: NFC antenna interface

RE: GPIO P1.02 on nRF54L15 doesn't work.

shibuta — Mon, 08 Sep 2025 06:24:50 GMT

I'll put prj.conf in my application below.

#
# Copyright (c) 2024 Nordic Semiconductor
#
# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
#

# Step 1 - Enable nrfx drivers #
CONFIG_NRFX_GRTC=y
#CONFIG_NRFX_SAADC=y
#CONFIG_NRFX_GPPI=y
#CONFIG_NRFX_TIMER2=y
CONFIG_NRFX_TIMER22=y

CONFIG_GPIO=y
CONFIG_I2C=y


CONFIG_COMPILER_OPT="-DARM_TABLE_TWIDDLECOEF_F32_64 -DARM_TABLE_BITREVIDX_FLT_64 -DARM_TABLE_TWIDDLECOEF_F32_64 -DARM_TABLE_TWIDDLECOEF_RFFT_F32_128 -DARM_MATH_CM4"
CONFIG_CMSIS_DSP=y
CONFIG_DSP=y
CONFIG_CMSIS_DSP_FASTMATH=y
CONFIG_CMSIS_DSP_STATISTICS=y
CONFIG_CMSIS_DSP_MATRIX=y
#CONFIG_NEWLIB_LIBC=y
#CONFIG_CMSIS_DSP_BAYES=y
CONFIG_CMSIS_DSP_TRANSFORM=y
CONFIG_CMSIS_DSP_SUPPORT=y
CONFIG_CMSIS_DSP_COMPLEXMATH=y
CONFIG_CMSIS_DSP_CONTROLLER=y
CONFIG_DSP_BACKEND_CMSIS=y
CONFIG_FPU=y

CONFIG_LOG=y

#added in order to get the thread name printed in the assertion log.
CONFIG_THREAD_NAME=y
CONFIG_MAIN_STACK_SIZE=2048

CONFIG_ADC=y

# Step 2 - Enable Bluetooth #
CONFIG_BT=y
CONFIG_BT_DEVICE_NAME="sample"
CONFIG_BT_PERIPHERAL=y
CONFIG_BT_EXT_ADV=y
CONFIG_BT_BROADCASTER=y
CONFIG_BT_OBSERVER=y

# Step 3 - Enable Coded PHY for Bluetooth LE #
CONFIG_BT_USER_PHY_UPDATE=y
CONFIG_BT_CTLR_PHY_CODED=y

# Step 4 - Enable Bluetooth LE Extended Advertising #
CONFIG_BT_EXT_ADV=y
CONFIG_BT_CTLR_ADV_EXT=y
CONFIG_BT_EXT_ADV_MAX_ADV_SET=2
CONFIG_BT_CTLR_ADV_DATA_LEN_MAX=251

# STEP 2.2 - Enable FOTA over Bluetooth LE
CONFIG_NCS_SAMPLE_MCUMGR_BT_OTA_DFU=y
CONFIG_MCUBOOT_BOOTUTIL_LIB=y
CONFIG_MCUBOOT_GENERATE_CONFIRMED_IMAGE=y
CONFIG_MCUBOOT_EXTRA_IMGTOOL_ARGS="--confirm"

CONFIG_WATCHDOG=n
CONFIG_FLASH=n
CONFIG_PM=n
CONFIG_DYNAMIC_INTERRUPTS=n
CONFIG_IRQ_OFFLOAD=n
CONFIG_THREAD_STACK_INFO=n
CONFIG_THREAD_CUSTOM_DATA=n
CONFIG_BOOT_BANNER=n
CONFIG_BOOT_DELAY=0
#CONFIG_CONSOLE=n
#CONFIG_UART_CONSOLE=n
#CONFIG_STDOUT_CONSOLE=n
#CONFIG_PRINTK=n
CONFIG_EARLY_CONSOLE=n
CONFIG_SIZE_OPTIMIZATIONS=y

CONFIG_BT_HCI_CORE_LOG_LEVEL_OFF=y

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC_CALIBRATION=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_500PPM=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_XTAL=n
CONFIG_MPSL_HFCLK_LATENCY=1600

# Step 6 - disable NFC for out-of-band pairing #
CONFIG_NFCT_PINS_AS_GPIOS=y