UART Interrupt fault

RE: UART Interrupt fault

billywalton — Mon, 06 Apr 2020 11:49:40 GMT

Yep, that was it, perfect, thanks for that

RE: UART Interrupt fault

Jørgen Holmefjord — Mon, 06 Apr 2020 11:26:04 GMT

Hi,

It seems that you have forgotten to replace the startup and system files from nRF52832 to nRF52833.

Under 'None' directory in the project browser, replace ses_startup_nrf52.s with ses_startup_nrf52833.s, and system_nrf52.c with system_nrf52833.c.

I verified that the interrupt handler is called after doing these changes in your project.

Best regards,
Jørgen

RE: UART Interrupt fault

billywalton — Mon, 06 Apr 2020 11:07:03 GMT

In addition, the call stack shows nothing, no optimisations are enabled

<info> app: Callpoint Startup..
<warning> UARTE: Function: nrfx_uarte_init, error code: NRF_SUCCESS.
<info> UARTE: Transfer rx_len: 4.
<info> UARTE: Function: nrfx_uarte_rx, error code: NRF_SUCCESS.
<error> hardfault: HARD FAULT at 0x00000000
<error> hardfault: R0: 0x000000E0 R1: 0x00000000 R2: 0x0EB6072E R3: 0xCAFEBABE
<error> hardfault: R12: 0x20004AFA LR: 0xFFFFFFF9 PSR: 0x00000038
<error> hardfault: Cause: The processor has attempted to execute an instruction that makes illegal use of the EPSR.

RE: UART Interrupt fault

billywalton — Mon, 06 Apr 2020 10:17:59 GMT

Thanks,

After including the hard fault handler I get

<error> hardfault: HARD FAULT at 0x00000000
<error> hardfault: R0: 0x000000E0 R1: 0x00000000 R2: 0x0EB6072E R3: 0xCAFEBABE
<error> hardfault: R12: 0x20004AFA LR: 0xFFFFFFF9 PSR: 0x00000038
<error> hardfault: Cause: The processor has attempted to execute an instruction that makes illegal use of the EPSR.

Is this something I have done wrong?

RE: UART Interrupt fault

Dmitry — Mon, 06 Apr 2020 09:43:12 GMT

Hi,

I don't see any problems in your code. You can look at call stack window to see where hard fault is coming from (make sure to compile project with disabled optimization). Even better way is to include SDK hardfault handling library (components\libraries\hardfault) into your project.

RE: UART Interrupt fault

billywalton — Sat, 04 Apr 2020 09:51:13 GMT

I am still very stuck with this problem, I have removed everything from my project and reduced it to the absolute minimum and still get the same problem - as soon as a single byte is received, I get a hardfault when the interrupt should be generated.

I have attached the project in the hope someone could point out what is not correct.

The pare is a nrf52833, so the pca directory name is not correct, but everything has been changed from a configuration point of view and the firmware is running on a 52833DK.

It looks to be an interrupt vector issue but I can't see where I can change it

Thanks for any help

devzone.nordicsemi.com/.../CP900.zip