Add stm32g4 support for FDCAN peripheral. Normal / FDCAN operation
supported, bitrate switching and filtering supported via API.
Timestamping and transmit event buffer support in API are TBD.
Originally tracked as: https://github.com/libopencm3/libopencm3/pull/1317
Reviewed-by: Karl Palsson <karlp@tweak.net.au>
Worked in nuances for differences between versions of STM32H7 devices, such as
handling of ODEN, explicit SCUEN bit, and different VOS mappings. This has
been validated on the STM32H7A3 and STM32H743 MCUs.
Move the STM32F4 QuadSPI peripheral defines to the common folder as the
F4 and H7 variants of the IP share almost all the same bits. For those
bits that are separate put them into their own headers.
The usart_common_fifos uses a very nice style of docs in the headers, so
inline help works in some editors, without having to have the source of
the library available as well. However, it means that the group
definition with the name doesn't appear until later, and then the title
is ignored. Move the description to the header definition instead.
Old API required users to manually construct bit maps frm opaquely named
defines, with little help. It also was a pure OR operation, with no way
to ever clear bits.
Signed-off-by: Karl Palsson <karlp@tweak.net.au>
bad Karl, you can't just _start_ using pragma on common files, and
expect it to keep working. Just finish, convert them fully to pragma.
pros: no more weird @cond boilerplate mess and trailing #endifs. easier
to follow
cons: no warning for people who deliberately try and include things in
bad orders.
We need per device header includes to make the per target documentation
generation work properly. The dispatch headers are to dispatch to the
_target_ not directly to the final implementation, remember, the final
required headers for each may be multiple files, plus extra definitions!
STM32G4 uses v2 ADC but has EXTSEL and ALIGN fields modified, rather
than making a v3 ADC for these minor changes, the definitions have been
moved to the chip specific headers, so that the common code can work for
G4 onwards.
Allows for abstraction for code that's dependent on knowing the source clock
for a peripheral. Implemented a few core peripherals that tend to have clock
tree differences between platforms (USART, timers, I2C, SPI).
