App gets stuck when booted from bootloader (works fine without bootloader) - SDK15 - 0xCAFEBABE in registers

RE: App gets stuck when booted from bootloader (works fine without bootloader) - SDK15 - 0xCAFEBABE in registers

Andy — Thu, 09 May 2019 18:11:09 GMT

At least the setting about the use of bonding needs to be the same.

RE: App gets stuck when booted from bootloader (works fine without bootloader) - SDK15 - 0xCAFEBABE in registers

Anne van Rossum — Thu, 09 May 2019 16:50:36 GMT

I hope you don't mean that you have to have the same settings for the bootloader as the application?

RE: App gets stuck when booted from bootloader (works fine without bootloader) - SDK15 - 0xCAFEBABE in registers

EarthLord — Fri, 08 Jun 2018 16:36:34 GMT

Andy, I'm in the same situation. I don't use NRF_DFU_BLE_REQUIRES_BONDS at all in the app. What changes did you do exactly? Thanks.

RE: App gets stuck when booted from bootloader (works fine without bootloader) - SDK15 - 0xCAFEBABE in registers

Andy — Thu, 17 May 2018 15:08:51 GMT

Fixed it.

NRF_DFU_BLE_REQUIRES_BONDS was set to 1 in the application but to 0 in the bootloader. This was causing some required code not to be compiled and therefore it was hanging there.

RE: App gets stuck when booted from bootloader (works fine without bootloader) - SDK15 - 0xCAFEBABE in registers

Andy — Thu, 17 May 2018 14:54:50 GMT

I have narrowed it down to this piece of code:

	uint32_t err_code;
	ble_dfu_buttonless_init_t dfus_init = {
		.evt_handler = ble_dfu_evt_handler
	};

	// Initialize the async SVCI interface to bootloader.
	err_code = ble_dfu_buttonless_async_svci_init();
	APP_ERROR_CHECK(err_code);

	if (err_code == NRF_SUCCESS) {
		err_code = ble_dfu_buttonless_init(&dfus_init);
		APP_ERROR_CHECK(err_code);
	} else {
		debug_error("Bootloader not found");
	}

Somewhere there it gets stuck.

RE: App gets stuck when booted from bootloader (works fine without bootloader) - SDK15 - 0xCAFEBABE in registers

Nguyen Hoan Hoang — Thu, 17 May 2018 14:44:36 GMT

The PC address looks like it's in the DFU code.

RE: App gets stuck when booted from bootloader (works fine without bootloader) - SDK15 - 0xCAFEBABE in registers

Andy — Thu, 17 May 2018 14:29:32 GMT

I'm sorry, I don't understand what you mean. I flashed the softdevice and the bootloader as usual with nrfjprog and a JLink. Then I did a DFU with NRF Connect for iOS. I can see that the bootloader is indeed jumping to the app because I'm getting a little bit of RTT output from the app, then it stops and I don't see anything anymore.

What makes you think the bootloader never jumps to the app?

RE: App gets stuck when booted from bootloader (works fine without bootloader) - SDK15 - 0xCAFEBABE in registers

Nguyen Hoan Hoang — Thu, 17 May 2018 14:24:39 GMT

How did you flash the DFU and your firmware ? It looks like DFU never jump to your firmware.

To debug your firmware with DFU, first upload your firmware using DFU. Then you can refresh firmware for debugging with Eclipse. Important that the binary of your firmware must be the same in both cases.

RE: App gets stuck on softdevice initialization when booted from bootloader (works fine without bootloader) - SDK15

Andy — Thu, 17 May 2018 14:14:23 GMT

I'm no longer sure about where the program is getting stuck, but I looked at the registers by halting the processor after it gets stuck and they read this:

PC = 0007763E, CycleCnt = 3C7E5A37
R0 = 00000064, R1 = 0007763F, R2 = CAFEBABE, R3 = CAFEBABE
R4 = 00000204, R5 = 00000000, R6 = 20004158, R7 = 00000000
R8 = 00000003, R9 = 00000003, R10= 0004314A, R11= 2000FF94
R12= 00000000
SP(R13)= 2000FF58, MSP= 2000FF58, PSP= 00000000, R14(LR) = FFFFFFF9
XPSR = 21000019: APSR = nzCvq, EPSR = 01000000, IPSR = 019 (INTISR10)
CFBP = 00000000, CONTROL = 00, FAULTMASK = 00, BASEPRI = 00, PRIMASK = 00

How can I use that information to figure out what's going on?