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.
61 строка
1,1 КиБ
Go
61 строка
1,1 КиБ
Go
// +build hifive1b
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package machine
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const (
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D0 = P16
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D1 = P17
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D2 = P18
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D3 = P19 // Green LED/PWM (PWM1_PWM1)
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D4 = P20 // PWM (PWM1_PWM0)
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D5 = P21 // Blue LED/PWM (PWM1_PWM2)
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D6 = P22 // Red LED/PWM (PWM1_PWM3)
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D7 = P16
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D8 = NoPin // PWM?
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D9 = P01
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D10 = P02 // SPI1_CS0
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D11 = P03 // SPI1_DQ0
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D12 = P04 // SPI1_DQ1
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D13 = P05 // SPI1_SCK
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D14 = NoPin // not connected
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D15 = P09 // does not seem to work?
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D16 = P10 // PWM (PWM2_PWM0)
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D17 = P11 // PWM (PWM2_PWM1)
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D18 = P12 // SDA (I2C0_SDA)/PWM (PWM2_PWM2)
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D19 = P13 // SDL (I2C0_SCL)/PWM (PWM2_PWM3)
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)
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const (
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LED = LED1
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LED1 = LED_RED
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LED2 = LED_GREEN
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LED3 = LED_BLUE
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LED_RED = P22
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LED_GREEN = P19
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LED_BLUE = P21
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)
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var DefaultUART = UART0
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const (
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// TODO: figure out the pin numbers for these.
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UART_TX_PIN = D1
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UART_RX_PIN = D0
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)
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// SPI pins
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const (
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SPI0_SCK_PIN = NoPin
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SPI0_SDO_PIN = NoPin
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SPI0_SDI_PIN = NoPin
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SPI1_SCK_PIN = D13
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SPI1_SDO_PIN = D11
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SPI1_SDI_PIN = D12
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)
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// I2C pins
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const (
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I2C0_SDA_PIN = D18
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I2C0_SCL_PIN = D19
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)
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