Cannot transfer more than 255 bytes via SPIM0 on nrf52840

RE: Cannot transfer more than 255 bytes via SPIM0 on nrf52840

jiri.husak — Tue, 09 Apr 2019 13:20:08 GMT

Hi Joergen,

thank you for your prompt answer. It would be also great if this is somehow propagated into the documentation. IMHO it would be much easier to classify this limitation as Errata and treat it properly than just mention it silently in the Instances table in OPS which is common to all engineering A,B and C.

Regards,

Jiri

RE: Cannot transfer more than 255 bytes via SPIM0 on nrf52840

Jørgen Holmefjord — Tue, 09 Apr 2019 11:03:11 GMT

The limitation is only present in Engineering A revision. I just verified that the register is 16 bits in Engineering B and C (v0.11.0 and v0.12.0 PDKs).

RE: Cannot transfer more than 255 bytes via SPIM0 on nrf52840

jiri.husak — Tue, 09 Apr 2019 10:31:39 GMT

Hello,

could you please advice which Engineering has this "limitation"? All types between engineering A-C? Because in other thread I can read that the engineering C is equal to revision 1. Please see answer here https://devzone.nordicsemi.com/f/nordic-q-a/38133/nrf52840-versions/147098#147098.

Thanks for clarification.

Regards,

Jiri

RE: Cannot transfer more than 255 bytes via SPIM0 on nrf52840

Jørgen Holmefjord — Thu, 21 Mar 2019 10:31:45 GMT

Not a bug, but a limitation/not implemented feature in the engineering revisions. Note that engineering revision chips are not final products and will have issues and missing features compared to the final product.

The limitation is documented in nRF52840 OPS v0.5.1.1 in the SPIM instances section:

RE: Cannot transfer more than 255 bytes via SPIM0 on nrf52840

Jiacheng Guo — Thu, 21 Mar 2019 10:12:51 GMT

I'm using v0.9.2

Serial number: 683055308

So it's supposed to be a bug in the early version of chips?

RE: Cannot transfer more than 255 bytes via SPIM0 on nrf52840

Jørgen Holmefjord — Thu, 21 Mar 2019 09:55:00 GMT

Hi,

Which revision of the chip are you using? This should work on rev 1 chips. I tested on nRF52840 PDK v0.9.0 vs nRF52840 DK v1.0.0:

$ nrfjprog --memwr 0x40003548 --val 256
Parsing parameters.
Writing.

$ nrfjprog --memrd 0x40003548
0x40003548: 00000000                              |....|

$ nrfjprog --memwr 0x40003548 --val 256
Parsing parameters.
Writing.

$ nrfjprog --memrd 0x40003548
0x40003548: 00000100                              |....|

Best regards,
Jørgen