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91946fc05e
This should really be more than one commit, but here it goes anyway: - added STM32F4 CDC UART support. For some reason, it seems to work only on the OTG_FS interface, the OTG_HS interface enumerates it, but doesn't seem to send/receive any data. - removed the "platform interface" functions for CDC UART. That was never really a platform interface, just a couple of functions reading and writing data from/to a CDC UART. Now each backend takes care of this as a special case in its platform_uart_xxx functions. - added buffering support for CDC UARTs - added uart.CDC to the uart module, so the CDC uart can be used directly from Lua. - stm32f4discovery now defaults to using the CDC, since it doesn't have a dedicated UART connector.