Add support for the P1AM-100 (similar to Arduino MKR)

src/machine/board_p1am-100_baremetal.go

@@ -0,0 +1,47 @@
+// +build sam,atsamd21,p1am_100
+
+package machine
+
+import (
+	"device/sam"
+	"runtime/interrupt"
+)
+
+// UART1 on the P1AM-100 connects to the normal TX/RX pins.
+var (
+	UART1 = UART{
+		Buffer: NewRingBuffer(),
+		Bus:    sam.SERCOM3_USART,
+		SERCOM: 5,
+	}
+)
+
+func init() {
+	UART1.Interrupt = interrupt.New(sam.IRQ_SERCOM5, UART1.handleInterrupt)
+}
+
+// I2C on the P1AM-100.
+var (
+	I2C0 = I2C{
+		Bus:    sam.SERCOM0_I2CM,
+		SERCOM: 0,
+	}
+)
+
+// SPI on the P1AM-100 is used for Base Controller.
+var (
+	SPI0 = SPI{
+		Bus:    sam.SERCOM1_SPI,
+		SERCOM: 1,
+	}
+	BASE_CONTROLLER_SPI = SPI0
+)
+
+// SPI1 is connected to the SD card slot on the P1AM-100
+var (
+	SPI1 = SPI{
+		Bus:    sam.SERCOM2_SPI,
+		SERCOM: 2,
+	}
+	SDCARD_SPI = SPI1
+)