nRF54L15DK, cannot port HAL SPI code that was working in nRF53

RE: nRF54L15DK, cannot port HAL SPI code that was working in nRF53

esmart-engineering — Sat, 08 Mar 2025 04:40:28 GMT

Thank you for everyone's help; I appreciate all your input. I was able to resolve the issue with my project, by fixing the following:

Increasing voltage on the I/O pins. It seems the default on nRF54 was too low for my SPI slave device.
Ensuring enough time between register writes to configure SPI slave device

RE: nRF54L15DK, cannot port HAL SPI code that was working in nRF53

Jennifer Gibbs — Wed, 05 Mar 2025 23:17:27 GMT

Hello,

You mentioned that you used Port 1 pins in your setup, which pin configurations have you tried? Have you tried setting the MOSI to High Drive? What I see is that in your read attempts the first byte 0x80 isn't set until AFTER the clock signal goes high so that's why it isn't getting decrypted correctly.

Jennifer Gibbs

RE: nRF54L15DK, cannot port HAL SPI code that was working in nRF53

esmart-engineering — Wed, 26 Feb 2025 05:14:51 GMT

Tested your sample but did not seem to work.

The SPI device does not have a register related to a device ID, so I included some reads/writes for a couple configuration-related registers. I have the raw logic analyzer file here. I used a Saleae Logic device, but even without one I think you can just download the software and view the file.

devzone.nordicsemi.com/.../spi_5F00_reg_5F00_0x10_5F00_0x13_5F00_read.sal

devzone.nordicsemi.com/.../spi_5F00_reg_5F00_0x10_5F00_0x13_5F00_write.sal

Here are the logic analyzer results from what I tried at the time this post was created (see my other post here for details on how it reads/writes):

I try writing to registers 0x10 thru 0x13
I expect to read back what I just wrote, but don't get anything. Reads in general just seem incorrect in multiple ways.
One of the reads was correct on MOSI (0x80 | 0x12 = 0x92), but MISO still reported 0x00 (see 2nd byte)
The other read did not properly detect the first '1' bit and had MOSI send 0x11 instead of 0x91

RE: nRF54L15DK, cannot port HAL SPI code that was working in nRF53

Sigurd Hellesvik — Tue, 25 Feb 2025 08:03:06 GMT

Good morning!

Here is a sample where I added updated the tfm_secure_peripehral sample for the nRF54L15.
devzone.nordicsemi.com/.../tfm_5F00_secure_5F00_peripheral_5F00_nrf54l15.zip

Can you try this way with your sensor?

If this does not work, can you upload the logic analyzer trace for both the "set Device ID" and "read Device ID"?

RE: nRF54L15DK, cannot port HAL SPI code that was working in nRF53

Sigurd Hellesvik — Fri, 21 Feb 2025 13:09:17 GMT

I am still working on making a sample to SPI in TF-M on the nRF54L15, but it is taking more time than expected.

RE: nRF54L15DK, cannot port HAL SPI code that was working in nRF53

esmart-engineering — Tue, 18 Feb 2025 18:14:51 GMT

The frequency is already supported. I added this and there was no compile/build errors. I added it like so: NRF_SPIM_FREQUENCY_STATIC_CHECK(NRF_SPIM22, 2000000);

RE: nRF54L15DK, cannot port HAL SPI code that was working in nRF53

Jennifer Gibbs — Tue, 18 Feb 2025 00:38:22 GMT

Hello,

Have you verified that the frequency you are trying to set is supported for the prescaler value chosen? See the following:

Thank you,

Jennifer Gibbs

RE: nRF54L15DK, cannot port HAL SPI code that was working in nRF53

esmart-engineering — Mon, 17 Feb 2025 08:31:22 GMT

Code pretty much worked out-of-the-box. This is confirmed in our nRF53 code, which did read/write correctly. It was only changed in the following ways:

all pins (CS, SCLK, MISO, MOSI) are used
interrupt mask ENDRX is enabled instead of ENDTX
NRF_SPIM4 was used instead of NRF_SPIM3 (changes to .yaml and .conf files were made accordingly)
nrf_spim_enable() and nrf_spim_disable() are called in functions to conserve power

nRF54 code is minimally changed from nRF53 code (but again, seems to read and/or write incorrectly). Only major changes were:

NRF_SPIM22 was being used
Pins I passed into spim_init() were all in Port 1
- I did try playing around with Port 2 pins (including cutting SB11-22 on the nRF54L15 DK) but it did not change the results.
nrf_spim_frequency_set() replaced w/ nrf_spim_prescaler_set(), since the former doesn't seem possible in nRF54 anymore
- Frequency is 2MHz, so now I call it with nrf_spim_prescaler_set(NRF_SPIM22, NRF_SPIM_PRESCALER_CALCULATE(NRF_SPIM22, 2000000));

Data read is wrong because when reading the SPI device's registers, it should return values I had written when initializing the peripheral (via SPI writes). But the values don't match what I wrote. Yet, logic analyzer also shows these same wrong values.

RE: nRF54L15DK, cannot port HAL SPI code that was working in nRF53

Sigurd Hellesvik — Mon, 17 Feb 2025 07:59:58 GMT

[quote user="esmart-engineering"] I don't expect nrfx to work especially since I need TFM[/quote]

Ah, right. Let us have a look at HAL then.

I see that there are SPIM code inside the secure partition sample. Do you mean to say that this code does not work out of the box?

Alternativley: How is your code different from what the sample does?

[quote user=""] but the data being read in is wrong[/quote]

Wrong how exactly?

RE: nRF54L15DK, cannot port HAL SPI code that was working in nRF53

esmart-engineering — Fri, 14 Feb 2025 17:22:58 GMT

If time permits, I can take a look. But that is using nrfx, and I'm looking for code using HAL directly. I don't expect nrfx to work especially since I need TFM (see Einar's Nov 1 post here). I'm also requesting code that works with nRF54L15, since examples like those were only tested with boards up thru nRF53.

RE: nRF54L15DK, cannot port HAL SPI code that was working in nRF53

Sigurd Hellesvik — Fri, 14 Feb 2025 14:48:05 GMT

Hi,

[quote user=""]Can you provide code for a simple working "HAL-SPI only" example that works on nRF54L15DK and NCS v2.9.0?

We would like to see if the issue is related to TF-M or not.

[/quote]

https://github.com/zephyrproject-rtos/hal_nordic/tree/master/nrfx/samples/src/nrfx_spim

[quote user=""]Can you provide code for a simple working "HAL-SPI + TFM-secure-partition" example that works on nRF54L15DK and NCS v2.9.0?[/quote]

Try the sample above first, and then we can get to this after.

[quote user=""]Are you aware of any other issues in the DK or NCS v2.9.0 that can cause issues with SPI? [/quote]

No, not really. I recommend testing the Zephyr SPI drivers for SPI in general to test this.
See for example The DevAcademy course on SPI for how to do this.

Regards,
Sigurd Hellesvik