Hard fault during interrupt request

RE: Hard fault during interrupt request

jeg223 — Mon, 08 Aug 2022 14:49:49 GMT

The RAM_START for the app is 0x20000000, but needs to match the bootloader RAM_START=0x20000008. After this change the interrupts in the app work as expected.

RE: Hard fault during interrupt request

jeg223 — Mon, 01 Aug 2022 15:36:42 GMT

The bootloader is not calling that, but I am not using a SoftDevice. When I add it to the nrf_bootloader_app_start function, the device seems hang for a bit then reset.

RE: Hard fault during interrupt request

Susheel Nuguru — Thu, 21 Jul 2022 11:51:53 GMT

Have you called this in your bootloader? Something like below

uint32_t nrf_dfu_mbr_init_sd(void)
{
    uint32_t ret_val;

    sd_mbr_command_t command =
    {
        .command = SD_MBR_COMMAND_INIT_SD
    };

    ret_val = sd_mbr_command(&command);

    return ret_val;
}

For more details, please look at this older thread.

RE: Hard fault during interrupt request

jeg223 — Wed, 20 Jul 2022 20:50:31 GMT

Here is the SCB->ICSR register after the NVIC_SetPendingIRQ call, but before the interrupt fires:

Here it is after the hard fault:

Other things that changed in the bootloader are the startup files to use the 52810 versions. I also modified nrf_bootloader_dfu_timers.c to use RTC0. RTC1 is being used by app_timer and there is no RTC2 on the 810.

The app works when the flash start is 0x0000 instead of 0x1000. If I set flash start to 0x1000 and load the mbr hex without the bootloader, it faults.

RE: Hard fault during interrupt request

Susheel Nuguru — Wed, 20 Jul 2022 18:16:44 GMT

seems like you are in an interrupt context already when you are trying to trigger another interrupt. Can you check the interrupt number and priority from the SCB->ICSR register?

What other changes have you made apart from the memory linker file changes?

RE: Hard fault during interrupt request

jeg223 — Wed, 20 Jul 2022 13:06:34 GMT

It looks like it is an IBUSERR. The fault happens when the interrupt fires. If I step past the NVIC_SetPendingIRQ(SWI_IRQn); in app_timer.c, there is no fault until I run again. Also, if I try to trigger other interrupts, I get the fault.

RE: Hard fault during interrupt request

Susheel Nuguru — Wed, 20 Jul 2022 12:29:15 GMT

What kind of hardfault do you get? nothing seems obviously wrong in your flash memory layout atleast.