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Copy feather-m4 to wioterminal
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‎src/machine/board_wioterminal.go‎

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// +build sam,atsamd51,feather_m4
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package machine
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import "device/sam"
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// used to reset into bootloader
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const RESET_MAGIC_VALUE = 0xf01669ef
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// GPIO Pins
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const (
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D0 = PB17 // UART0 RX/PWM available
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D1 = PB16 // UART0 TX/PWM available
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D4 = PA14 // PWM available
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D5 = PA16 // PWM available
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D6 = PA18 // PWM available
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D8 = PB03 // built-in neopixel
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D9 = PA19 // PWM available
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D10 = PA20 // can be used for PWM or UART1 TX
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D11 = PA21 // can be used for PWM or UART1 RX
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D12 = PA22 // PWM available
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D13 = PA23 // PWM available
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D21 = PA13 // PWM available
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D22 = PA12 // PWM available
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D23 = PB22 // PWM available
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D24 = PB23 // PWM available
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D25 = PA17 // PWM available
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)
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// Analog pins
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const (
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A0 = PA02 // ADC/AIN[0]
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A1 = PA05 // ADC/AIN[2]
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A2 = PB08 // ADC/AIN[3]
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A3 = PB09 // ADC/AIN[4]
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A4 = PA04 // ADC/AIN[5]
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A5 = PA06 // ADC/AIN[10]
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)
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const (
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LED = D13
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)
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// UART0 aka USBCDC pins
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const (
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USBCDC_DM_PIN = PA24
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USBCDC_DP_PIN = PA25
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)
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// UART1 pins
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const (
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UART_TX_PIN = D1
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UART_RX_PIN = D0
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)
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// UART2 pins
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const (
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UART2_TX_PIN = A4
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UART2_RX_PIN = A5
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)
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// I2C pins
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const (
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SDA_PIN = D22 // SDA: SERCOM2/PAD[0]
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SCL_PIN = D21 // SCL: SERCOM2/PAD[1]
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)
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// I2C on the Feather M4.
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var (
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I2C0 = I2C{
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Bus: sam.SERCOM2_I2CM,
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SERCOM: 2,
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}
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)
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// SPI pins
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const (
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SPI0_SCK_PIN = D25 // SCK: SERCOM1/PAD[1]
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SPI0_MOSI_PIN = D24 // MOSI: SERCOM1/PAD[3]
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SPI0_MISO_PIN = D23 // MISO: SERCOM1/PAD[2]
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)
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// SPI on the Feather M4.
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var (
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SPI0 = SPI{
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Bus: sam.SERCOM1_SPIM,
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SERCOM: 1,
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}
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)
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// USB CDC identifiers
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const (
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usb_STRING_PRODUCT = "Adafruit Feather M4"
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usb_STRING_MANUFACTURER = "Adafruit"
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)
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var (
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usb_VID uint16 = 0x239A
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usb_PID uint16 = 0x8022
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)

‎src/machine/machine_atsamd51p19.go‎

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// +build sam,atsamd51,atsamd51j19
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// Peripheral abstraction layer for the atsamd51.
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//
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// Datasheet:
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// http://ww1.microchip.com/downloads/en/DeviceDoc/60001507C.pdf
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//
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package machine
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import "device/sam"
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const HSRAM_SIZE = 0x00030000
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// InitPWM initializes the PWM interface.
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func InitPWM() {
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// turn on timer clocks used for PWM
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sam.MCLK.APBBMASK.SetBits(sam.MCLK_APBBMASK_TCC0_ | sam.MCLK_APBBMASK_TCC1_)
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sam.MCLK.APBCMASK.SetBits(sam.MCLK_APBCMASK_TCC2_)
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sam.MCLK.APBDMASK.SetBits(sam.MCLK_APBDMASK_TCC4_)
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//use clock generator 0
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sam.GCLK.PCHCTRL[25].Set((sam.GCLK_PCHCTRL_GEN_GCLK0 << sam.GCLK_PCHCTRL_GEN_Pos) |
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sam.GCLK_PCHCTRL_CHEN)
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sam.GCLK.PCHCTRL[29].Set((sam.GCLK_PCHCTRL_GEN_GCLK0 << sam.GCLK_PCHCTRL_GEN_Pos) |
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sam.GCLK_PCHCTRL_CHEN)
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sam.GCLK.PCHCTRL[38].Set((sam.GCLK_PCHCTRL_GEN_GCLK0 << sam.GCLK_PCHCTRL_GEN_Pos) |
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sam.GCLK_PCHCTRL_CHEN)
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}
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// getTimer returns the timer to be used for PWM on this pin
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func (pwm PWM) getTimer() *sam.TCC_Type {
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switch pwm.Pin {
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case PA16:
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return sam.TCC1
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case PA17:
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return sam.TCC1
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case PA14:
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return sam.TCC2
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case PA15:
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return sam.TCC2
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case PA18:
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return sam.TCC1
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case PA19:
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return sam.TCC1
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case PA20:
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return sam.TCC0
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case PA21:
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return sam.TCC0
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case PA23:
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return sam.TCC0
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case PA22:
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return sam.TCC0
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case PB31:
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return sam.TCC4
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default:
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return nil // not supported on this pin
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}
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}

‎src/runtime/runtime_atsamd51p19.go‎

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// +build sam,atsamd51,atsamd51j19
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package runtime
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import (
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"device/sam"
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)
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func initSERCOMClocks() {
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// Turn on clock to SERCOM0 for UART0
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sam.MCLK.APBAMASK.SetBits(sam.MCLK_APBAMASK_SERCOM0_)
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sam.GCLK.PCHCTRL[7].Set((sam.GCLK_PCHCTRL_GEN_GCLK1 << sam.GCLK_PCHCTRL_GEN_Pos) |
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sam.GCLK_PCHCTRL_CHEN)
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// sets the "slow" clock shared by all SERCOM
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sam.GCLK.PCHCTRL[3].Set((sam.GCLK_PCHCTRL_GEN_GCLK1 << sam.GCLK_PCHCTRL_GEN_Pos) |
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sam.GCLK_PCHCTRL_CHEN)
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// Turn on clock to SERCOM1
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sam.MCLK.APBAMASK.SetBits(sam.MCLK_APBAMASK_SERCOM1_)
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sam.GCLK.PCHCTRL[8].Set((sam.GCLK_PCHCTRL_GEN_GCLK1 << sam.GCLK_PCHCTRL_GEN_Pos) |
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sam.GCLK_PCHCTRL_CHEN)
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// Turn on clock to SERCOM2
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sam.MCLK.APBBMASK.SetBits(sam.MCLK_APBBMASK_SERCOM2_)
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sam.GCLK.PCHCTRL[23].Set((sam.GCLK_PCHCTRL_GEN_GCLK1 << sam.GCLK_PCHCTRL_GEN_Pos) |
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sam.GCLK_PCHCTRL_CHEN)
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// Turn on clock to SERCOM3
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sam.MCLK.APBBMASK.SetBits(sam.MCLK_APBBMASK_SERCOM3_)
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sam.GCLK.PCHCTRL[24].Set((sam.GCLK_PCHCTRL_GEN_GCLK1 << sam.GCLK_PCHCTRL_GEN_Pos) |
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sam.GCLK_PCHCTRL_CHEN)
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// Turn on clock to SERCOM4
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sam.MCLK.APBDMASK.SetBits(sam.MCLK_APBDMASK_SERCOM4_)
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sam.GCLK.PCHCTRL[34].Set((sam.GCLK_PCHCTRL_GEN_GCLK1 << sam.GCLK_PCHCTRL_GEN_Pos) |
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sam.GCLK_PCHCTRL_CHEN)
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// Turn on clock to SERCOM5
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sam.MCLK.APBDMASK.SetBits(sam.MCLK_APBDMASK_SERCOM5_)
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sam.GCLK.PCHCTRL[35].Set((sam.GCLK_PCHCTRL_GEN_GCLK1 << sam.GCLK_PCHCTRL_GEN_Pos) |
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sam.GCLK_PCHCTRL_CHEN)
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}

‎targets/atsamd51p19a.json‎

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{
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"inherits": ["cortex-m"],
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"llvm-target": "armv7em-none-eabi",
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"build-tags": ["atsamd51j19", "atsamd51", "sam"],
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"cflags": [
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"--target=armv7em-none-eabi",
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"-Qunused-arguments"
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],
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"linkerscript": "targets/atsamd51.ld",
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"extra-files": [
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"src/device/sam/atsamd51j19a.s"
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]
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}

‎targets/wioterminal.json‎

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{
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"inherits": ["atsamd51j19a"],
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"build-tags": ["sam", "atsamd51j19a", "feather_m4"],
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"flash-1200-bps-reset": "true",
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"flash-method": "msd",
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"msd-volume-name": "FEATHERBOOT",
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"msd-firmware-name": "firmware.uf2"
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}

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