nRF21540 is not compatible with nRF54L15

RE: nRF21540 is not compatible with nRF54L15

Ziyao Zhou — Mon, 14 Apr 2025 08:11:49 GMT

I have successdully enable nRF21540! Thank you!

RE: nRF21540 is not compatible with nRF54L15

Ziyao Zhou — Thu, 10 Apr 2025 15:33:06 GMT

I just try to use v3.0.0-preview2, after compile the RTT will be OK, there is no error now.

However, I can not receive the ADV and cannot setup connection through both a central device or the nrRF Toolbox in the phone.

Could you please help me check this, the code isdevzone.nordicsemi.com/.../peripheral_5F00_uart_5F00_preview.zip

Thank you so much!

RE: nRF21540 is not compatible with nRF54L15

Einar Thorsrud — Thu, 10 Apr 2025 10:57:08 GMT

Hi,

You can get it by following the instruction under Installing the nRF Connect SDK, particularily Get the nRF Connect SDK code. This explains both how ton install main and (preview) releases.

RE: nRF21540 is not compatible with nRF54L15

Ziyao Zhou — Thu, 10 Apr 2025 10:53:09 GMT

How could I get the 3.0 preview release? Is this correct?

RE: nRF21540 is not compatible with nRF54L15

Einar Thorsrud — Thu, 10 Apr 2025 10:46:22 GMT

Hi,

I am sorry, I was not clear. I was refering to the "main" branch (what was previosuly often called "master"), i.e. the bleading edge, and not a released version. That should not be used for an end product, but if you want to work with the nRF21540 on the nRF54L15 that is one possibility as it is not currently supported in any released version. Another possibility is to use the 3.0 preview reelease.

RE: nRF21540 is not compatible with nRF54L15

Ziyao Zhou — Thu, 10 Apr 2025 10:40:20 GMT

What does "main" means here, is it main.c? I am quite confused.

RE: nRF21540 is not compatible with nRF54L15

Einar Thorsrud — Thu, 10 Apr 2025 10:31:38 GMT

I see. That will not work, you can test with main (where it is supported and for which the doucmentation you linked to in the original post apply), or wait for the next release.

RE: nRF21540 is not compatible with nRF54L15

Ziyao Zhou — Thu, 10 Apr 2025 09:36:16 GMT

I am using NCS 2.91

RE: nRF21540 is not compatible with nRF54L15

Einar Thorsrud — Thu, 10 Apr 2025 09:20:59 GMT

Hi,

At first glance this looks good, but you need to use main as this supprort was added after the realease of SDK 2.9. Are you using main or a preview release? Which hash are you using?

RE: nRF21540 is not compatible with nRF54L15

Ziyao Zhou — Mon, 07 Apr 2025 14:31:02 GMT

Hi,

Yes I have check this , the error will be:

My comment on RSSI was wrong, as at that time I forget to add dppi ppib in overlay

I am using nRF21540 EK and nrf54L15 DK to test

Thank you!

the code is:

devzone.nordicsemi.com/.../2475.peripheral_5F00_uart.zip

RE: nRF21540 is not compatible with nRF54L15

Einar Thorsrud — Mon, 07 Apr 2025 14:15:20 GMT

Hi,

These configs look sensible assumign the pins etc are correct. Regarding the DPPIC and PPIB configurations you can copy the configuration from the documentation as you have.

Did you test this? Does it build and work runtime? If not, in what way does it fail?

Also, regarding your comment on change in RSSI, I take that to mean that you have tested with the nRF21540? Which HW are you testing that with? How are you testing and measuring?

RE: nRF21540 is not compatible with nRF54L15

Ziyao Zhou — Fri, 04 Apr 2025 15:08:23 GMT

Hi, sorry for the delay, I just find a time to test but I still cannot use the nRF21540,

My overlay is:

&dppic10 {
	status = "okay";
};

&ppib11 {
	status = "okay";
};

&ppib21 {
	status = "okay";
};

&dppic20 {
	status = "okay";
};

&ppib22 {
	status = "okay";
};

&ppib30 {
	status = "okay";
};

&dppic30 {
	status = "okay";
};


/ {
	nrf_radio_fem: name_of_fem_node {
	   compatible  = "nordic,nrf21540-fem";
	   tx-en-gpios = <&gpio1 11 GPIO_ACTIVE_HIGH>;
	   rx-en-gpios = <&gpio1 12 GPIO_ACTIVE_HIGH>;
	   pdn-gpios   = <&gpio1 2 GPIO_ACTIVE_HIGH>;
		mode-gpios   = <&gpio1 3 GPIO_ACTIVE_HIGH>;
		tx-en-settle-time-us = <12>;
		rx-en-settle-time-us = <12>;
 };
}; //54L15

I have checked the document and it says:"Enable appropriate instances of the DPPIC and PPIB peripherals in the devicetree file" I have no idea about this so I have raise another ticket here

My config is:

#
# Copyright (c) 2018 Nordic Semiconductor
#
# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
#

# Enable the UART driver
CONFIG_UART_ASYNC_API=y
CONFIG_NRFX_UARTE0=y
CONFIG_SERIAL=y

CONFIG_GPIO=y

# Make sure printk is printing to the UART console
CONFIG_CONSOLE=y
CONFIG_UART_CONSOLE=y

CONFIG_HEAP_MEM_POOL_SIZE=2048

CONFIG_BT=y
CONFIG_BT_PERIPHERAL=y
CONFIG_BT_DEVICE_NAME="ZDynamic test beacon"
CONFIG_BT_MAX_CONN=1
CONFIG_BT_MAX_PAIRED=1

# Enable the NUS service
CONFIG_BT_NUS=y

# Enable bonding
CONFIG_BT_SETTINGS=y
CONFIG_FLASH=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_FLASH_MAP=y

# Enable DK LED and Buttons library
CONFIG_DK_LIBRARY=y

# This example requires more stack
CONFIG_MAIN_STACK_SIZE=1152
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048

# Config logger
CONFIG_LOG=y
CONFIG_USE_SEGGER_RTT=y
CONFIG_LOG_BACKEND_RTT=y
CONFIG_LOG_BACKEND_UART=n
CONFIG_LOG_PRINTK=n

CONFIG_ASSERT=y


# #FEM EKEK
# CONFIG_MPSL_FEM=y
# CONFIG_MPSL=y
# # CONFIG_MPSL_FEM_NRF21540_GPIO=y
# # CONFIG_MPSL_FEM_NRF21540_GPIO_SPI=y EK用不上
# CONFIG_BT_CTLR_TX_PWR_DYNAMIC_CONTROL=y
# CONFIG_MPSL_FEM_NRF21540_TX_GAIN_DB=20
# CONFIG_MPSL_FEM_NRF21540_RX_GAIN_DB=13
# CONFIG_BT_CTLR_TX_PWR_ANTENNA=20


#
# Copyright (c) 2018 Nordic Semiconductor
#
# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
#

# Enable the UART driver
CONFIG_UART_ASYNC_API=y
CONFIG_NRFX_UARTE0=y
CONFIG_SERIAL=y

CONFIG_GPIO=y

# Make sure printk is printing to the UART console
CONFIG_CONSOLE=y
CONFIG_UART_CONSOLE=y

CONFIG_HEAP_MEM_POOL_SIZE=2048

CONFIG_BT=y
CONFIG_BT_PERIPHERAL=y
CONFIG_BT_DEVICE_NAME="ZDynamic test beacon"
CONFIG_BT_MAX_CONN=1
CONFIG_BT_MAX_PAIRED=1

# Enable the NUS service
CONFIG_BT_NUS=y

# Enable bonding
CONFIG_BT_SETTINGS=y
CONFIG_FLASH=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_FLASH_MAP=y

# Enable DK LED and Buttons library
CONFIG_DK_LIBRARY=y

# This example requires more stack
CONFIG_MAIN_STACK_SIZE=1152
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048

# Config logger
CONFIG_LOG=y
CONFIG_USE_SEGGER_RTT=y
CONFIG_LOG_BACKEND_RTT=y
CONFIG_LOG_BACKEND_UART=n
CONFIG_LOG_PRINTK=n

CONFIG_ASSERT=y


# #FEM EKEK
# CONFIG_MPSL_FEM=y
# CONFIG_MPSL=y
# # CONFIG_MPSL_FEM_NRF21540_GPIO=y
# # CONFIG_MPSL_FEM_NRF21540_GPIO_SPI=y EK用不上
# CONFIG_BT_CTLR_TX_PWR_DYNAMIC_CONTROL=y
# CONFIG_MPSL_FEM_NRF21540_TX_GAIN_DB=20
# CONFIG_MPSL_FEM_NRF21540_RX_GAIN_DB=13
# CONFIG_BT_CTLR_TX_PWR_ANTENNA=20


#FEM general
CONFIG_MPSL_FEM=y
CONFIG_MPSL=y
CONFIG_MPSL_FEM_NRF21540_GPIO=y
CONFIG_BT_CTLR_TX_PWR_DYNAMIC_CONTROL=y
CONFIG_MPSL_FEM_NRF21540_TX_GAIN_DB=20
CONFIG_MPSL_FEM_NRF21540_RX_GAIN_DB=13
CONFIG_MPSL_FEM_NRF21540_RUNTIME_PA_GAIN_CONTROL=y
CONFIG_BT_CTLR_TX_PWR_ANTENNA=20
CONFIG_NFCT_PINS_AS_GPIOS=y
# CONFIG_BT_CTLR_TX_PWR_PLUS_8=y

I have remove R21 R22 and short R33 R34. I have also added CONFIG_NFCT_PINS_AS_GPIOS =y

The real diagram is like this:

Could you help ne using nRF21540 on nRF54L15, thank you so much!

RE: nRF21540 is not compatible with nRF54L15

Einar Thorsrud — Mon, 31 Mar 2025 13:30:52 GMT

Can you elaborate on how you have connected it physically as well as the full configuration you are using?

RE: nRF21540 is not compatible with nRF54L15

Ziyao Zhou — Mon, 31 Mar 2025 12:40:05 GMT

There is no change on the RSSI when I connect as I shown

RE: nRF21540 is not compatible with nRF54L15

Einar Thorsrud — Mon, 31 Mar 2025 12:16:43 GMT

Hi,

The nRF54L15 and nRF21540 are compatible. Can you expalin in more detail how it is not working?