When initialising the SJA1000 peripheral on some implementations
(SJA1000_FDTOL), "releasing" the buffer when the Rx buffer is empty
causes a buffer pointer misalignment.
On peripheral initialise, remove the flag to "release" the buffer.
This should be safe for all systems using the SJA1000 CAN controller
as a "reset" to the peripheral clears the Rx FIFO.
This driver is based on ESP32 TWAI CAN drivers currently available
in Nuttx, and captures the differences currently present across the
TWAI drivers for easy future adaption to remaining ESP32 platforms
with no loss of support/function. Also provides a generic SJA1000 CAN
driver solution that is CPU-architecture independent.
Changes:
- Low-level driver re-written to allow usage independent of CPU
architecture, and support both SJA1000 and TWAI CAN controllers.
- Platform-specific settings abstracted away to be provided by board
layer.
- Support for multiple instances of SJA1000 driver.
