Nordic nRF54L

The nRF54L series from Nordic Semiconductor is based on an ARM Cortex-M33 application core. NuttX supports nRF54L15 and nRF54LM20A/B as standalone secure images, with a 128 MHz CPU clock and SysTick scheduling.

Peripheral Support

The following list indicates peripherals supported in NuttX:

Peripheral	Support	Notes
GPIO	Yes
GPIOTE	No
GRTC	No
PWM	No
QDEC	No
RADIO	No
RRAMC	No
SAADC	No
SPIM	No
TIMER	No
TWIM	No
UARTE	Yes	No hardware flow control
USBHS	No
WDT	No

GPIO

Pins can be configured and operated using nrf54l_gpio_* functions.

UARTE

UART0 through UART4 correspond to UARTE20, UARTE21, UARTE22, UARTE30 and UARTE00. nRF54LM20 also provides UART5 and UART6 using UARTE23 and UARTE24. Each enabled UART requires BOARD_UARTn_TX_PIN and BOARD_UARTn_RX_PIN definitions. Any enabled UART can be selected as the serial console. UART4 requires the dedicated UARTE00 TXD and RXD pins listed in the chip’s pin assignment table.

CONFIG_SERIAL_TERMIOS enables runtime baud rate, data bits, parity and stop bit configuration. A format change returns -EBUSY while a byte is being transmitted or DMA error recovery is in progress.

Power Management

With SysTick selected, the CPU remains awake so its clock keeps running. CONFIG_PM initializes the NuttX power management framework. System OFF is not supported.