crashing after adding a driver to dts

RE: crashing after adding a driver to dts

ziv123 — Thu, 22 Sep 2022 10:32:02 GMT

ok the problem for the seconde issue is that in the driver init function i forgot to bind the bus

spi_dev = device_get_binding(..bus_name)

that, with the unused mosi set to 0xFF in dts, solved the issu

best regards

Ziv

RE: crashing after adding a driver to dts

Kenneth — Tue, 20 Sep 2022 14:06:03 GMT

Hello,

I am not entirely sure which driver you are trying to add to your project (existing or new one), maybe you can share your project and explain what driver you are trying to add that you have problem with?

In general you can find that there are multiple tests and samples using drivers in zephyr, these show how you can implement a particular peripheral to your project:
https://github.com/nrfconnect/sdk-zephyr/tree/main/tests/drivers
https://github.com/nrfconnect/sdk-zephyr/tree/main/samples/drivers

Have in mind that if you are calling device_get_binding() in your project then it's already initializing the spi driver (if used) and you need to use the spi zephyr api or sensor api, so that may be the reason why calling nrfx_spim_init() return EBUSY.

If you want to use the nrfx_spi driver api directly, then you need to look at the below sample that show how to use nrfx_gpiote directly (similar approach can be done for nrfx_spi), have in mind that in this case you also need to add handling of the interrupt by using IRQ_CONNECT():
https://github.com/nrfconnect/sdk-zephyr/tree/main/samples/boards/nrf/nrfx

Kenneth

RE: crashing after adding a driver to dts

ziv123 — Tue, 20 Sep 2022 08:53:16 GMT

ok the fix for the above issue is to set the unconnected MOSI to the value of NRFX_SPIM_PIN_NOT_USED , which is 0xFF

so it passes the driver init, however,

when i try to init the spi 'nrfx_spim_init(..)'return -EBUSY and if i try to uninit first with 'nrfx_spim_uninit(..)' then i get the following crash:

[00003039] <err> os: ***** BUS FAULT *****
[00003040] <err> os:   Imprecise data bus error
[00003040] <err> os: r0/a1:  0x00020000  r1/a2:  0x0000000a  r2/a3:  0xe000e100
[00003041] <err> os: r3/a4:  0x0000005b r12/ip:  0x50000000 r14/lr:  0x0002db0f
[00003041] <err> os:  xpsr:  0x01000000
[00003041] <err> os: s[ 0]:  0x00000000  s[ 1]:  0x00000000  s[ 2]:  0x00000000  s[ 3]:  0x00000000
[00003042] <err> os: s[ 4]:  0x00000000  s[ 5]:  0x00000000  s[ 6]:  0x00000000  s[ 7]:  0x00000000
[00003042] <err> os: s[ 8]:  0x00000000  s[ 9]:  0x00000000  s[10]:  0x00000000  s[11]:  0x00000000
[00003043] <err> os: s[12]:  0x00000000  s[13]:  0x00000000  s[14]:  0x00000000  s[15]:  0x00000000
[00003043] <err> os: fpscr:  0x00000600
[00003043] <err> os: Faulting instruction address (r15/pc): 0x0002db18
[00003043] <err> os: >>> ZEPHYR FATAL ERROR 0: CPU exception on CPU 0
[00003044] <err> os: Current thread: 0x20004bf0 (unknown)
[00023698] <err> fatal_error: Resetting system
*** Booting Zephyr OS build v2.6.99-ncs1-1  ***

any ideas ?

hope to read from you soon

best regards

Ziv