esp-ringbuf funtion placement is now controlled by its own configs:
CONFIG_RINGBUF_PLACE_FUNCTIONS_INTO_FLASH and CONFIG_RINGBUF_PLACE_ISR_FUNCTIONS_INTO_FLASH
Closes https://github.com/espressif/esp-idf/issues/9198
The legacy driver can't handle the breaking change between esp chips
very well.
And it's not elegant to extend new feature like DMA, ETM.
The new driver can return a opaque handle for each RMT channel.
An obvious transaction concept was also introduced.
TX and RX functionalities are splited out.
The legacy driver is still available, but new feature won't be added.
Enable RMT_SUPPRESS_DEPRECATE_WARN if you don't want to see the
deprecated warnings.
