kywwilson11 opened a new pull request, #15411:
URL: https://github.com/apache/nuttx/pull/15411
## Summary
This pull request adds the FDCAN character driver to the STM32H5
architecture. This driver is heavily based on the stm32 driver for the STM32G4.
The STM32G4 and STM32H5 have identical register sets for FDCAN.
There were some minor changes vs the STM32G4 implementation:
1. Changes for Queue Mode. fdcan_txempty needed modifications. See commit
log.
2. Automatic calculation of bit timing - Ported STM32H7 fdcan_bittiming
function to be used here. Automatic bit timing is an option and can be
overridden with Kconfig settings like the STM32G4 does.
3. STM32H5 has only 2 FDCAN devices vs 3 on the STM32G4.
## Impact
This should only impact the STM32H5 architecture.
## Testing
1. Tested both FDCAN1 and FDCAN2 by utilizing the can example nuttx
application.
5. Tested in standard CAN mode externally with PEAK PCAN device on both
FDCAN1 and FDCAN2.
a. Used Adafruit TJA1051T transceiver.
6. Tested CAN FD mode in loopback mode on both FDCAN1 and FDCAN2.
7. Tested CAN FD mode with bit-rate switching (BRS) in loopback mode on both
FDCAN1 and FDCAN2.
8. Tested FIFO mode and Queue mode.
9. Utilized logic scope in debug and to confirm BRS functionality.
Another pull request will follow this one with changes in the
boards/arm/stm32h5/nucleo-h563zi directory.
[devttyACM0_2025_01_02.12.38.53.326.txt](https://github.com/user-attachments/files/18293657/devttyACM0_2025_01_02.12.38.53.326.txt)
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