Access bootloader on 32 pin BlueNRG-lp?

[RMcCa.3]

I noticed that an5471 says that the uart interface for flashing the bootloader is only available on PA8 and PA9, but those pins aren't present on the 32 pin version. Is there any other way to access the bootloader on this device?​

[Peter BENSCH]

Welcome, @RMcCa.3​, to the community!

As you can find in the datasheet, the UART is also available on the QFN32, namely PA8 = pin 8 and PA9 = pin 7.

Does it answer your question?

Regards

/Peter

[RMcCa.3]

Thank you, I must have mixed up PA and PB when I was reading it before.​ Does it matter that uart isn't listed on those pins in the datasheet? It has usart instead for af0 for both pins.

[Peter BENSCH]

No, it does not matter because UART is only a partial function of an USART and thus an alternative designation.

When the bootloader is activated, it configures the two pins PA8 and PA9 to use them as UART.

Good luck!

Regards

/Peter