Checking nrf21540-DK registers using SPI3

RE: Checking nrf21540-DK registers using SPI3

AMarch01 — Tue, 25 Feb 2025 16:35:12 GMT

Yup, added in a few items to point to the FEM on the nrf21540dk/nrf52840 target, enabled the power pin and it appears to work. The HW_REVISION doesn't match the pdf I have. I received 0x30 and expected a 0x03.

*** Booting nRF Connect SDK v2.7.0-5cb85570ca43 ***
*** Using Zephyr OS v3.6.99-100befc70c74 ***
[00:00:00.365,356] <inf> app: Hello World! nrf21540dk/nrf52840
[00:00:00.365,356] <inf> app: spi_is_ready_dt() returned 0x1
[00:00:01.365,661] <inf> app: spi_tranceive_dt() returned 0
[00:00:01.365,692] <inf> app: data returned 80 0c
[00:00:02.365,905] <inf> app: spi_tranceive_dt() returned 0
[00:00:02.365,936] <inf> app: data returned 80 30
[00:00:03.366,180] <inf> app: spi_tranceive_dt() returned 0
[00:00:03.366,210] <inf> app: data returned 80 02
[00:00:04.366,455] <inf> app: spi_tranceive_dt() returned 0
[00:00:04.366,485] <inf> app: data returned 80 1c

Just for clarity the code (enclosed) is reading registers 0x14,0x15,0x16, and 0x17 from the FEM.

devzone.nordicsemi.com/.../4527.main.c

RE: Checking nrf21540-DK registers using SPI3

AMarch01 — Tue, 25 Feb 2025 14:12:04 GMT

Great, thanks. I will look into this and report back to you ... asap.

RE: Checking nrf21540-DK registers using SPI3

Edvin — Tue, 25 Feb 2025 13:48:55 GMT

Hello,

This repository is a bit outdated.

I will attach an application that sets up basic SPIM functionality, so perhaps you can test this. Look at how it gets the devicetree from main.c.

There is no overlay for the nRF21540 DK, but you can copy the content from the nrf52840dk_nrf52840.overlay.

Note that if you want to set the nRF21540 in programming state, you need to set the PDN pin high. Please see:

https://docs.nordicsemi.com/bundle/ps_nrf21540/page/chapters/device_control/doc/operating_state.html

To be sure, you should also make sure that the TX_EN and RX_EN are low, so that it doesn't enter TX or RX mode.

devzone.nordicsemi.com/.../hello_5F00_world_5F00_spim.zip

Best regards,

Edvin

RE: Checking nrf21540-DK registers using SPI3

AMarch01 — Mon, 24 Feb 2025 18:50:02 GMT

The original code was from here
GitHub - too1/ncs-spi-master-slave-example

I removed the slave portion to attempt to read the FEM