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

Author: quentinmit

src/machine/board_p1am-100.go

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+// +build p1am_100
+
+// This contains the pin mappings for the ProductivityOpen P1AM-100 board.
+//
+// For more information, see: https://facts-engineering.github.io/
+//
+package machine
+
+// used to reset into bootloader
+const RESET_MAGIC_VALUE = 0x07738135
+
+// Note: On the P1AM-100, pins D8, D9, D10, A3, and A4 are used for
+// communication with the base controller.
+
+// GPIO Pins
+const (
+	D0 Pin = PA22 // PWM available
+	D1 Pin = PA23 // PWM available
+	D2 Pin = PA10 // PWM available
+	D3 Pin = PA11 // PWM available
+	D4 Pin = PB10 // PWM available
+	D5 Pin = PB11 // PWM available
+	D6 Pin = PA20 // PWM available
+	D7 Pin = PA21 // PWM available
+
+	D8  Pin = PA16 // PWM available
+	D9  Pin = PA17
+	D10 Pin = PA19 // PWM available
+	D11 Pin = PA08
+	D12 Pin = PA09
+	D13 Pin = PB23
+	D14 Pin = PB22
+
+	// Remaining pins are shared with analog pins
+	D15 Pin = PA02
+
+	D16 Pin = PB02
+	D17 Pin = PB03
+	D18 Pin = PA04 // PWM available
+	D19 Pin = PA05 // PWM available
+	D20 Pin = PA06
+	D21 Pin = PA07
+)
+
+// Analog pins
+const (
+	A0 Pin = PA02 // ADC/AIN[0]
+	A1 Pin = PB02 // ADC/AIN[10]
+	A2 Pin = PB03 // ADC/AIN[11]
+	A3 Pin = PA04 // ADC/AIN[4]
+	A4 Pin = PA05 // ADC/AIN[5]
+	A5 Pin = PA06 // ADC/AIN[6]
+	A6 Pin = PA07 // ADC/AIN[7]
+)
+
+const (
+	SWITCH      Pin = PA28
+	LED         Pin = PB08
+	ADC_BATTERY Pin = PB09 // ADC/AIN[3]
+)
+
+// P1AM Base Controller
+const (
+	BASE_SLAVE_SELECT_PIN Pin = A3
+	BASE_SLAVE_ACK_PIN    Pin = A4
+	BASE_ENABLE_PIN       Pin = PB09
+)
+
+// UART0 aka USBCDC pins
+const (
+	USBCDC_DM_PIN          Pin = PA24
+	USBCDC_DP_PIN          Pin = PA25
+	USBCDC_HOST_ENABLE_PIN Pin = PA18
+)
+
+// UART1 pins
+const (
+	UART_RX_PIN Pin = PB23 // RX: SERCOM5/PAD[3]
+	UART_TX_PIN Pin = PB22 // TX: SERCOM5/PAD[2]
+)
+
+// I2C pins
+const (
+	SDA_PIN Pin = PA08 // SDA:  SERCOM0/PAD[0]
+	SCL_PIN Pin = PA09 // SCL:  SERCOM0/PAD[1]
+)
+
+// SPI pins
+const (
+	SPI0_SCK_PIN  Pin = D9  // SCK: SERCOM1/PAD[1]
+	SPI0_MOSI_PIN Pin = D8  // MOSI: SERCOM1/PAD[0]
+	SPI0_MISO_PIN Pin = D10 // MISO: SERCOM1/PAD[3]
+)
+
+// SD card pins
+const (
+	SDCARD_MISO_PIN Pin = PA15 // MISO: SERCOM2/PAD[3]
+	SDCARD_MOSI_PIN Pin = PA12 // MOSI: SERCOM2/PAD[0]
+	SDCARD_SCK_PIN  Pin = PA13 // SCK: SERCOM2/PAD[1]
+	SDCARD_SS_PIN   Pin = PA14 // SS: as GPIO
+	SDCARD_CD_PIN   Pin = PA27
+)
+
+// I2S pins
+const (
+	I2S_SCK_PIN Pin = D2
+	I2S_SD_PIN  Pin = A6
+	I2S_WS_PIN      = D3
+)
+
+// USB CDC identifiers
+const (
+	usb_STRING_PRODUCT      = "P1AM-100"
+	usb_STRING_MANUFACTURER = "Facts Engineering"
+)
+
+var (
+	usb_VID uint16 = 0x1354
+	usb_PID uint16 = 0x4000
+)

src/machine/board_p1am-100_baremetal.go

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+// +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
+)

targets/p1am-100.json

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+{
+    "inherits": ["atsamd21g18a"],
+    "build-tags": ["sam", "atsamd21g18a", "p1am_100"],
+    "flash-command": "bossac -d -i -e -w -v -R --port={port} --offset=0x2000 {bin}",
+    "flash-1200-bps-reset": "true"
+}