all: add a flag to the command line to select the serial implementation

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This can be very useful for some purposes:

  * It makes it possible to disable the UART in cases where it is not
    needed or needs to be disabled to conserve power.
  * It makes it possible to disable the serial output to reduce code
    size, which may be important for some chips. Sometimes, a few kB can
    be saved this way.
  * It makes it possible to override the default, for example you might
    want to use an actual UART to debug the USB-CDC implementation.

It also lowers the dependency on having machine.Serial defined, which is
often not defined when targeting a chip. Eventually, we might want to
make it possible to write `-target=nrf52` or `-target=atmega328p` for
example to target the chip itself with no board specific assumptions.

The defaults don't change. I checked this by running `make smoketest`
before and after and comparing the results.

This commit is contained in:

Ayke van Laethem

2021-06-01 13:27:58 +02:00

committed by

Ron Evans

parent 75298bb84b

commit 96e863f0f3

114 changed files with 185 additions and 104 deletions

									
										src/machine/board_clue_alpha.go
									
		-5
	
												View File
												
				@@ -104,11 +104,6 @@ const (

					UART_TX_PIN = D1

				)

				// Serial is the USB device

				var (

					Serial = USB

				)

				// I2C pins

				const (

					SDA_PIN = D20 // I2C0 external