OTA DFU Bootloader SDK9.0.0

[martial]

Hi all,

I am trying to put the NRF51822 XXAA chip into DFU mode (the board used is a custom one and not the one in DK/EK).

SoftDevice V8.0.0 Bootloader Source from SDK9.0.0

I was able to build the bootloader successfully using GCC but when both the SD(loaded 1st) and Bootloader.hex(downloaded 2nd) are downloaded I am unable to see the peripheral advertising as DFUTarg. I tried to debug with a breakpoint on the main function but the breakpoint was not hit. So I guess the problem to be either on the startup file or on the linker file.

Attached below is the bootloader source code that I have made use.

Bootloader.zip

Kindly help me in fixing the issue so that I am able to proceed with OTA DFU of App firmware

Thanks

[Nguyen Hoan Hoang]

Many thing you need to check first. Which chip revision is on your custom board? Rev 1 won't work. Does your board have the 32KHz crystal? If not you need to change the softdevice init to use RC oscillator instead. in order to breakpoint, you need to flash the dfu with nrfgo or other means that sets the UCIR properly. After that you can break. Without the UCIR set properly, softdevice won't jump to DFU, though you cannot break in debug. Try to break in startup reset function first to see until when it crashes. Also make sure your ld script set the ram setting correctly for your chip. the DK uses 32KB ram.

[martial]

• I use a Rev 3 chip
• Board has a 32KHz crystal
• I have used nrfgo and what to flash? where can I find the bootloader hex files that can be flashed so that UICR is set properly
• How to modify the ld script? The RAM size is 16KB

[Nguyen Hoan Hoang]

you need to use either nrfgo or nrfprog to flash softdevice + dfu first, then go back to eclipse and start debug. to change ram size. It's ins the file dfu_gcc_nrf51.ld

[Hung Bui]

@martial: In your makefile, you use this linker script:

nrf51822_xxaa_s110: LINKER_SCRIPT=gcc_s110_nrf51822_xxaa.ld

This is wrong, please use dfu_gcc_nrf51.ld. Without the correct linker script, the setting in UICR area is not set and the MBR will not be able to find your bootloader start address. If you change to:

nrf51822_xxaa_s110: LINKER_SCRIPT=dfu_gcc_nrf51.ld

It should work.

[syntroniks]

I wish I was more dedicated, I just replaced xAA silicon with the xxAC chips on my boards. I was getting issues with crc computation and did not investigate further.