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Ayke van Laethem
b67351babe
Previously, the machine.UART0 object had two meanings:
- it was the first UART on the chip
- it was the default output for println
These two meanings conflict, and resulted in workarounds like:
- Defining UART0 to refer to the USB-CDC interface (atsamd21,
atsamd51, nrf52840), even though that clearly isn't an UART.
- Defining NRF_UART0 to avoid a conflict with UART0 (which was
redefined as a USB-CDC interface).
- Defining aliases like UART0 = UART1, which refer to the same
hardware peripheral (stm32).
This commit changes this to use a new machine.Serial object for the
default serial port. It might refer to the first or second UART
depending on the board, or even to the USB-CDC interface. Also, UART0
now really refers to the first UART on the chip, no longer to a USB-CDC
interface.
The changes in the runtime package are all just search+replace. The
changes in the machine package are a mixture of search+replace and
manual modifications.
This commit does not affect binary size, in fact it doesn't affect the
resulting binary at all.
47 lines
702 B
Go
47 lines
702 B
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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// Serial is the USB device
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var Serial = USB
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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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