NRF52832 won't reset chip after dfu

[h.wen]

won't reset chip after dfu

application:      \examples\ble_peripheral\ble_app_buttonless_dfu

bootloader:     \examples\dfu\secure_bootloader\pca10040_s132_ble_debug\arm5_no_packs

SOFTDEVICE:  S132

android  app:  nrf connect VESION 4.24.3

I have programmed  application and merged bootloader, application, soft device.

I can do dfu as many as I want,

but the problem is the MCU can not auto reset   whenever I finish dfu.

i have to    "disconnect " from the nrf connect app, then it reset

how to 

nrf log:  

00> <debug> app: Enter nrf_bootloader_fw_activate
00>
00> <info> app: No firmware to activate.
00>
00> <debug> app: App is valid
00>
00> <info> nrf_dfu_settings: Backing up settings page to address 0x7E000.
00>
00> <debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
00>
00> <debug> app: Running nrf_bootloader_app_start with address: 0x00001000
00>
00> <debug> app: Disabling interrupts. NVIC->ICER[0]: 0x0

[Vidar Berg]

Hello,

Does your bootloader have logging over UART enabled logging by any chance? That's can cause the bootloader to hang indefinitely for the reasons discussed in this post: https://devzone.nordicsemi.com/f/nordic-q-a/57536/freeze-in-nrf_bootloader_app_start-on-nrf_log_flush

Best regards,

Vidar

[h.wen]

bootloader does not enable UART OR logging,

Removing line contains NRF_LOG_FLUSH (nrf_bootloader_app_start.c:75) have no affect.

bootloader is base on the examples without any change:

1. nRF5_SDK_17.0.2_d674dde\examples\dfu\secure_bootloader\pca10040_s132_ble

2. nRF5_SDK_17.0.2_d674dde\examples\dfu\secure_bootloader\pca10040_s132_ble_debug

Another strange issue : no logs print out while in stage of bootloader  with  application In combination with freertos

application:      \examples\ble_peripheral\ble_app_buttonless_dfu +freertos

actually both  the application and dfu running well,but no logs print out while in stage of bootloader

[Vidar Berg]

Can you run "nrfjprog --readregs" when the device has gotten stuck in this state? I.e. after the "00> <debug> app: Disabling interrupts. NVIC->ICER[0]: 0x0" line is printed. The Program Counter (PC) should tell us exactly where it hangs.

[h.wen]

here is the cmd log:

C:\Users\Administrator>nrfjprog --readregs
R0: 0x00025278
R1: 0x20005548
R2: 0x00000000
R3: 0x00000001
R4: 0x200000B8
R5: 0x00000000
R6: 0xE000E000
R7: 0x0000002A
R8: 0x00000000
R9: 0x00000000
R10: 0x00000000
R11: 0x00000000
R12: 0x0000000C
SP: 0x20005548
LR: 0x00016299
PC: 0x00025278
xPSR: 0x61000000
MSP: 0x20005548
PSP: 0x00000000

no logs print out while in stage of bootloader  with  application In combination with freertos

application:      \examples\ble_peripheral\ble_app_buttonless_dfu +freertos

actually both  the application and dfu running well,but no logs print out while in stage of bootloader

here is the rtt log:

00> <info> app: Setting vector table to bootloader: 0x00071000
00>
00> <info> app: Setting vector table to main app: 0x00026000
00>
00> <info> app: DFU FreeRTOS example started.

00> <info> app: Device is preparing to enter bootloader mode.
00>
00> <info> app: Disconnected 1 links.
00>
00> <info> app: Device will enter bootloader mode.

[Vidar Berg]

Hello,

I not sure what Softdevice version you use, but based on the address range, it seems like the program is running inside the sd_app_evt_wait() idle loop. So it has not "crashed" at least.

Can you check if the device is advertising in DFU mode?

h.wen said:

actually both  the application and dfu running well,but no logs print out while in stage of bootloader

It can be tricky to get RTT logging working with both a bootloader and app running on the same device: https://devzone.nordicsemi.com/f/nordic-q-a/30310/easy-way-to-merge-bootloader-and-application-rtt-output. I would suggest to enable UART logging in the app if that's an option.