Calling sd_ble_gatts_hvx() from within Timer ISR causes HardFault

RE: Calling sd_ble_gatts_hvx() from within Timer ISR causes HardFault

anealca — Wed, 26 Oct 2022 04:03:28 GMT

Vidar Berg

Excellent...

Lowering the timer IRQ level to 5 solved the Hard Fault and now the code functions exactly as written...

thanks...

Problem Resolved.

RE: Calling sd_ble_gatts_hvx() from within Timer ISR causes HardFault

anealca — Wed, 26 Oct 2022 03:51:39 GMT

Vicar...

Thanks for this thought...

I'm using HIGH (2) for my SAADC so I can get a 1k Ain data collection rate...

I've set the timer level to HIGH (2) as well but at 250Hz I shouldn't need it that high...

I'll lower it and see if that solves the issue.

Adrian

RE: Calling sd_ble_gatts_hvx() from within Timer ISR causes HardFault

Vidar Berg — Tue, 25 Oct 2022 16:21:16 GMT

Hello,

What is the interrupt priority of the timer interrupt? The CPU will raise a hardfault exception if the program makes a SD API call from an interrupt priority that is higher than the SVC interrupt itself (i.e. interrupt with pri. below 4 - lower numerical value equals higher priority).

Best regards,

Vidar

Edit: here is some general information about how the SD APIs work if you are new to the softdevice architecture: https://infocenter.nordicsemi.com/topic/sds_s140/SDS/s1xx/overview/api_overview.html and some about interrupt priorities: https://infocenter.nordicsemi.com/topic/sds_s140/SDS/s1xx/processor_avail_interrupt_latency/exception_mgmt_sd.html

RE: Calling sd_ble_gatts_hvx() from within Timer ISR causes HardFault

anealca — Tue, 25 Oct 2022 16:12:18 GMT

Somehow I cut off the "ret_code_t" return code from the included code segment.