96e863f0f3
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.
43 строки
656 Б
Go
43 строки
656 Б
Go
// +build nrf52840_mdk
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package machine
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const HasLowFrequencyCrystal = true
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// LEDs on the nrf52840-mdk (nRF52840 dev board)
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const (
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LED Pin = LED_GREEN
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LED_GREEN Pin = 22
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LED_RED Pin = 23
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LED_BLUE Pin = 24
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)
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// UART pins
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const (
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UART_TX_PIN Pin = 20
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UART_RX_PIN Pin = 19
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)
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// I2C pins (unused)
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const (
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SDA_PIN = NoPin
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SCL_PIN = NoPin
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)
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// SPI pins (unused)
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const (
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SPI0_SCK_PIN = NoPin
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SPI0_SDO_PIN = NoPin
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SPI0_SDI_PIN = NoPin
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)
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// USB CDC identifiers
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const (
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usb_STRING_PRODUCT = "Makerdiary nRF52840 MDK"
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usb_STRING_MANUFACTURER = "Nordic Semiconductor ASA"
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)
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var (
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usb_VID uint16 = 0x1915
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usb_PID uint16 = 0xCAFE
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)
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