machine/qtpy: add board definition for Adafruit QTPy

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

Makefile

@@ -323,6 +323,8 @@ smoketest:
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=itsybitsy-nrf52840  examples/blinky1
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=qtpy  				examples/blinky1
+	@$(MD5SUM) test.hex
 	# test pwm
 	$(TINYGO) build -size short -o test.hex -target=itsybitsy-m0        examples/pwm
 	@$(MD5SUM) test.hex

src/machine/board_qtpy.go

@@ -0,0 +1,118 @@
+// +build sam,atsamd21,qtpy
+
+package machine
+
+import (
+	"device/sam"
+	"runtime/interrupt"
+)
+
+// used to reset into bootloader
+const RESET_MAGIC_VALUE = 0xf01669ef
+
+// GPIO Pins
+const (
+	D0  = PA02 // PWM available
+	D1  = PA03
+	D2  = PA04 // PWM available
+	D3  = PA05 // PWM available
+	D4  = PA16 // PWM available
+	D5  = PA17 // PWM available
+	D6  = PA06
+	D7  = PA07
+	D8  = PA11
+	D9  = PA09
+	D10 = PA10
+	D11 = PA18
+	D12 = PA15
+	D13 = PA27
+	D14 = PA23
+	D15 = PA19
+	D16 = PA22
+	D17 = PA08
+)
+
+// Analog pins
+const (
+	A0 = D1
+	A1 = D1
+	A2 = D2
+	A3 = D3
+	A4 = D4
+)
+
+const (
+	LED = D13
+)
+
+// UART0 aka USBCDC pins
+const (
+	USBCDC_DM_PIN = PA24
+	USBCDC_DP_PIN = PA25
+)
+
+// UART1 pins
+const (
+	UART_TX_PIN = D6
+	UART_RX_PIN = D7
+)
+
+// UART1 on the QT Py M0.
+var (
+	UART1 = UART{
+		Buffer: NewRingBuffer(),
+		Bus:    sam.SERCOM0_USART,
+		SERCOM: 0,
+	}
+)
+
+func init() {
+	UART1.Interrupt = interrupt.New(sam.IRQ_SERCOM0, UART1.handleInterrupt)
+}
+
+// SPI pins
+const (
+	SPI0_SCK_PIN = D8
+	SPI0_SDO_PIN = D10
+	SPI0_SDI_PIN = D9
+)
+
+// SPI on the QT Py M0.
+var (
+	SPI0 = SPI{
+		Bus:    sam.SERCOM0_SPI,
+		SERCOM: 0,
+	}
+)
+
+// I2C pins
+const (
+	SDA_PIN = D4 // SDA
+	SCL_PIN = D5 // SCL
+)
+
+// I2C on the QT Py M0.
+var (
+	I2C0 = I2C{
+		Bus:    sam.SERCOM2_I2CM,
+		SERCOM: 2,
+	}
+)
+
+// I2S pins
+const (
+	I2S_SCK_PIN = PA10
+	I2S_SD_PIN  = PA08
+	I2S_WS_PIN  = NoPin // TODO: figure out what this is on QT Py M0.
+)
+
+// USB CDC identifiers
+const (
+	usb_STRING_PRODUCT      = "Adafruit QTPy M0"
+	usb_STRING_MANUFACTURER = "Adafruit"
+)
+
+var (
+	usb_VID uint16 = 0x239A
+	usb_PID uint16 = 0x80CB
+)

targets/qtpy.json

@@ -0,0 +1,8 @@
+{
+    "inherits": ["atsamd21e18a"],
+    "build-tags": ["sam", "atsamd21e18a", "qtpy"],
+    "flash-1200-bps-reset": "true",
+    "flash-method": "msd",
+    "msd-volume-name": "QTPYBOOT",
+    "msd-firmware-name": "firmware.uf2"
+}