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How a STD ID CAN message passing the EXT ID filter on STM32F0?

Murat Sevil
Associate II

‎2021-09-20 1:18 AM

Hi everyone,

I have a question about STM32F042 CAN filtering mechanism. I'm working on a CAN line which includes a lot of messages with extended ID. I have used a filter 0xFFFFFFFF for 0x18FEF100 ID. Normally everything was fine. But I saw a message with 0x000 Standard ID on the line. The message is passing through my filter. How is it pass?

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