USB bootloader for NRF24LU1+ issue

[eugenePi]

Dear all,

I have an issue using USB bootloader for NRF24LU1+ device.

I've used a USB dongle and programmed USB bootloader to chip via SPI using external programmer.

The bootloader HEX file is taken from here: nRFgo SDK 2.3.0.10040\precompiled_hex\keil\boot24lu1p-f32.hex

After this the bootloader works OK and the chip can be flashed via USB using nRFGo Studio.

But when I try to use the bootloader from my own firmware, it's not working (not enumerates as USB device, etc.)

I use the following test code (compiled under Keil 5.11.2.0) to call the bootloader, but with no success:

void main()
{
#pragma asm
     LJMP 0x7800
#pragma endasm
}

What am I doing wrong?

Thanks in advance!

[eugenePi]

Hi Hung,

Thanks a lot for the project, it was really helpful. After comparing linker options and setting jump address to 0x3800 it finally works for me and flashes via nRFGo Studio ))

Best regards and good luck!