machine/microbit-v2: add initial support based on work done by @alankrantas thank you!

Signed-off-by: deadprogram <ron@hybridgroup.com>

src/machine/board_microbit-v2.go

@@ -0,0 +1,114 @@
+// +build microbit_v2
+
+package machine
+
+// The micro:bit does not have a 32kHz crystal on board.
+const HasLowFrequencyCrystal = false
+
+const (
+	LED  = P13
+	LED1 = LED
+)
+
+// Buttons on the micro:bit v2 (A and B)
+const (
+	BUTTON  Pin = BUTTONA
+	BUTTONA Pin = P5
+	BUTTONB Pin = P11
+)
+
+// UART pins
+const (
+	UART_TX_PIN Pin = P34
+	UART_RX_PIN Pin = P33
+)
+
+// ADC pins
+const (
+	ADC0 Pin = P0
+	ADC1 Pin = P1
+	ADC2 Pin = P2
+)
+
+// I2C0 (internal) pins
+const (
+	SDA_PIN  Pin = SDA0_PIN
+	SCL_PIN  Pin = SCL0_PIN
+	SDA0_PIN Pin = P30
+	SCL0_PIN Pin = P31
+)
+
+// I2C1 (external) pins
+const (
+	SDA1_PIN Pin = P20
+	SCL1_PIN Pin = P19
+)
+
+// SPI pins
+const (
+	SPI0_SCK_PIN Pin = P13
+	SPI0_SDO_PIN Pin = P15
+	SPI0_SDI_PIN Pin = P14
+)
+
+// GPIO/Analog pins
+const (
+	P0  Pin = 2
+	P1  Pin = 3
+	P2  Pin = 4
+	P3  Pin = 31
+	P4  Pin = 28
+	P5  Pin = 14
+	P6  Pin = 37
+	P7  Pin = 11
+	P8  Pin = 10
+	P9  Pin = 9
+	P10 Pin = 30
+	P11 Pin = 23
+	P12 Pin = 12
+	P13 Pin = 17
+	P14 Pin = 1
+	P15 Pin = 13
+	P16 Pin = 34
+	P19 Pin = 26
+	P20 Pin = 32
+	P21 Pin = 21
+	P22 Pin = 22
+	P23 Pin = 15
+	P24 Pin = 24
+	P25 Pin = 19
+	P26 Pin = 36
+	P27 Pin = 0
+	P28 Pin = 20
+	P29 Pin = 5
+	P30 Pin = 16
+	P31 Pin = 8
+	P32 Pin = 25
+	P33 Pin = 40
+	P34 Pin = 6
+)
+
+// LED matrix pins
+const (
+	LED_COL_1 Pin = P4
+	LED_COL_2 Pin = P7
+	LED_COL_3 Pin = P3
+	LED_COL_4 Pin = P6
+	LED_COL_5 Pin = P10
+	LED_ROW_1 Pin = P21
+	LED_ROW_2 Pin = P22
+	LED_ROW_3 Pin = P23
+	LED_ROW_4 Pin = P24
+	LED_ROW_5 Pin = P25
+)
+
+// USB CDC identifiers
+const (
+	usb_STRING_PRODUCT      = "BBC micro:bit V2"
+	usb_STRING_MANUFACTURER = "BBC"
+)
+
+var (
+	usb_VID uint16 = 0x0d28
+	usb_PID uint16 = 0x0204
+)