stm32: add blues wireless swan

src/machine/board_swan.go

@@ -0,0 +1,63 @@
+//go:build swan
+// +build swan
+
+package machine
+
+import (
+	"device/stm32"
+	"runtime/interrupt"
+)
+
+const (
+	// LED on the SWAN
+	LED = PE2
+
+	// UART pins
+	//    PA9 and PA10 are connected to the SWAN Tx/Rx
+	UART_TX_PIN = PA9
+	UART_RX_PIN = PA10
+
+	// I2C pins
+	//    PB6 is SCL
+	//    PB7 is SDA
+	I2C0_SCL_PIN = PB6
+	I2C0_SDA_PIN = PB7
+
+	// SPI pins
+	SPI1_SCK_PIN = PD1
+	SPI1_SDI_PIN = PB14
+	SPI1_SDO_PIN = PB15
+	SPI0_SCK_PIN = SPI1_SCK_PIN
+	SPI0_SDI_PIN = SPI1_SDI_PIN
+	SPI0_SDO_PIN = SPI1_SDO_PIN
+)
+
+var (
+	// USART1 is connected to the TX/RX pins
+	UART1  = &_UART1
+	_UART1 = UART{
+		Buffer:            NewRingBuffer(),
+		Bus:               stm32.USART1,
+		TxAltFuncSelector: 7,
+		RxAltFuncSelector: 7,
+	}
+	DefaultUART = UART1
+
+	// I2C1 is documented, alias to I2C0 as well
+	I2C1 = &I2C{
+		Bus:             stm32.I2C1,
+		AltFuncSelector: 4,
+	}
+	I2C0 = I2C1
+
+	// SPI1 is documented, alias to SPI0 as well
+	SPI1 = &SPI{
+		Bus:             stm32.SPI2,
+		AltFuncSelector: 5,
+	}
+	SPI0 = SPI1
+)
+
+func init() {
+	UART1.Interrupt = interrupt.New(stm32.IRQ_USART1, _UART1.handleInterrupt)
+}