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Ayke van Laethem
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.
87 lines
1.4 KiB
Go
87 lines
1.4 KiB
Go
// +build stm32f4disco
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package machine
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import (
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"device/stm32"
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"runtime/interrupt"
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)
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const (
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LED = LED_BUILTIN
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LED1 = LED_GREEN
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LED2 = LED_ORANGE
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LED3 = LED_RED
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LED4 = LED_BLUE
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LED_BUILTIN = LED_GREEN
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LED_GREEN = PD12
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LED_ORANGE = PD13
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LED_RED = PD14
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LED_BLUE = PD15
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)
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const (
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BUTTON = PA0
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)
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// UART pins
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const (
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UART_TX_PIN = PA2
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UART_RX_PIN = PA3
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)
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var (
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UART1 = &_UART1
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_UART1 = UART{
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Buffer: NewRingBuffer(),
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Bus: stm32.USART2,
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TxAltFuncSelector: AF7_USART1_2_3,
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RxAltFuncSelector: AF7_USART1_2_3,
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}
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DefaultUART = UART1
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)
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// set up RX IRQ handler. Follow similar pattern for other UARTx instances
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func init() {
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UART1.Interrupt = interrupt.New(stm32.IRQ_USART2, _UART1.handleInterrupt)
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}
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// SPI pins
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const (
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SPI1_SCK_PIN = PA5
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SPI1_SDI_PIN = PA6
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SPI1_SDO_PIN = PA7
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SPI0_SCK_PIN = SPI1_SCK_PIN
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SPI0_SDI_PIN = SPI1_SDI_PIN
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SPI0_SDO_PIN = SPI1_SDO_PIN
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)
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// MEMs accelerometer
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const (
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MEMS_ACCEL_CS = PE3
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MEMS_ACCEL_INT1 = PE0
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MEMS_ACCEL_INT2 = PE1
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)
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// Since the first interface is named SPI1, both SPI0 and SPI1 refer to SPI1.
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// TODO: implement SPI2 and SPI3.
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var (
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SPI0 = SPI{
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Bus: stm32.SPI1,
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AltFuncSelector: AF5_SPI1_SPI2,
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}
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SPI1 = &SPI0
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)
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const (
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I2C0_SCL_PIN = PB6
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I2C0_SDA_PIN = PB9
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)
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var (
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I2C0 = &I2C{
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Bus: stm32.I2C1,
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AltFuncSelector: AF4_I2C1_2_3,
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}
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)
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