STM32L431 CAN BOOTLOADER on PA11-12

[Sirk77]

I use alternatives CAN pins PA11&PA12, based on spec standard CAN pins to use CAN bootloader are PB8-9. Is it possible to use PA11-12 to enter CAN bootloader or NOT? so far it does not work.

[STTwo-32]

Hello @Sirk77 

For the CAN bootloader on the STM32L431, you have to use the PB8 and PB9 pins as indicated on the AN2606.

Best Regards.

STTwo-32 

[mƎALLEm]

Hello,

The CAN config is hardcoded in the bootloader and as per table Table 145. STM32L43xxx/44xxx configuration in system memory boot mode from AN2606 / Rev 63 page 332, the only GPIO resources available for STM32L431 chip are PB8 and PB9:

You may connect PA11 / PB8 and PA12 / PB9 in bootloader mode in your HW (while insuring PA12 pin is kept as input mode) then disconnect them after or using an external MUX.

[Sirk77]

thx for feedback