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STM32F2/STM32F4: Unfortunate clash between CAN2 and HS-USB (ULPI)

Question asked by bil.til on Jan 29, 2012
Hi,
I just discovered, that unfortunately it is NOT possible, to use CAN2 together with USB-HS in the STM32F4 or STM32F2 device.

CAN2-RX is available only on pins PB5 or PB12. But if Hi-Speed USB is used (ULPI interface), these 2 pins are needed for ULPI_D5 and ULPI_D7 (which do not have a second choice).

This is quite a stupid clash - for a Hi-Speed USB device, it is really useful to have two CAN machines on board ... .

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