Unable to flash Bluenrg345 via Uart bootloader

[rameshkvaw]

Hi, this is regarding the bluenrg345 device 

We have developed a custom board for reading and sharing data via bluenrg device

For flashing we use RF flasher utility tool and uart bootloader via usb to uart ic

We have flashed a couple of times using this method, but few of the boards (5/10) do not gets flashed

stating error as " Exit flashBoard: Exception ID1: auto baudrate functionality failed " on RF flasher tool

- we have tried couple of debugging and replaced few discrete components

- replaced bluenrg device as well 

- can we know what is leading to this issue?

- What is issue and how can we solve it ?

Although flashing using STLINK and RF flasher tool for the exact same board does works 

[Laurent LOUAZON]

Hello,

For entering bootloader have you respected below sequence:

- Set PA10 to high

- Perform a HW reset 

- release PA10

Then you should be able to access UART bootloader through dedicated UART PA8/PA10.

Regards

Laurent

[rameshkvaw]

Thanks for the Input ,

Yes I am following above mentioned procedure