STM32G474RET FDCAN Tx FIFO free level always be 0

eason_Yi · ‎2024-05-09

1. [Part Number] STM32G474RET
2. [Environment] CubeMx on custom board
3. [Schematics] NA
4. [Details]

The function "HAL_FDCAN_GetTxFifoFreeLevel" always return 0, Tx FIFO cant be cleaned, but my can bus is in error-active status, TEC is 0, REC is 0

5. [Expected behavior] The messages in Tx FIFO should be cleaned normally
6. [How to reproduce] Keep sending a CAN FD message every 140us by function "HAL_FDCAN_AddMessageToTxFifoQ"
7. [Occurrence] Maybe 1 time per hour, maybe not happen a whole day.
8. [Sanity checks] can bus is in error-active status, TEC is 0, REC is 0

SofLit · ‎2024-07-05

6. [How to reproduce] Keep sending a CAN FD message every 140us by function "HAL_FDCAN_AddMessageToTxFifoQ"

Every 140us? why? very short as timing. Could you please relax the timing and test for example with 100ms?

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