96e863f0f3
This can be very useful for some purposes:
* It makes it possible to disable the UART in cases where it is not
needed or needs to be disabled to conserve power.
* It makes it possible to disable the serial output to reduce code
size, which may be important for some chips. Sometimes, a few kB can
be saved this way.
* It makes it possible to override the default, for example you might
want to use an actual UART to debug the USB-CDC implementation.
It also lowers the dependency on having machine.Serial defined, which is
often not defined when targeting a chip. Eventually, we might want to
make it possible to write `-target=nrf52` or `-target=atmega328p` for
example to target the chip itself with no board specific assumptions.
The defaults don't change. I checked this by running `make smoketest`
before and after and comparing the results.
79 строки
1,3 КиБ
Go
79 строки
1,3 КиБ
Go
// +build itsybitsy_m4
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package machine
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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 = PA16 // UART0 RX/PWM available
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D1 = PA17 // UART0 TX/PWM available
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D2 = PA07
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D3 = PB22
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D4 = PA14 // PWM available
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D5 = PA15 // PWM available
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D6 = PB02 // dotStar clock
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D7 = PA18 // PWM available
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D8 = PB03 // dotStar data
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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 = PA23 // PWM available
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D13 = PA22 // 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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// 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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const (
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UART2_TX_PIN = A4
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UART2_RX_PIN = D2
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)
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// I2C pins
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const (
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SDA_PIN = PA12 // SDA: SERCOM2/PAD[0]
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SCL_PIN = PA13 // SCL: SERCOM2/PAD[1]
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)
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// SPI pins
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const (
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SPI0_SCK_PIN = PA01 // SCK: SERCOM1/PAD[1]
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SPI0_SDO_PIN = PA00 // SDO: SERCOM1/PAD[0]
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SPI0_SDI_PIN = PB23 // SDI: SERCOM1/PAD[3]
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)
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// USB CDC identifiers
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const (
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usb_STRING_PRODUCT = "Adafruit ItsyBitsy 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 = 0x802B
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)
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