Improvements for stm32wle targets :

- board/stm32: Add STM32 Nucleo WL55JC board
- stm32/stm32wl: Set 48Mhz HSE32/PLL as default Clock, SPI implementation

src/machine/board_nucleowl55jc.go

@@ -0,0 +1,72 @@
+//go:build nucleowl55jc
+// +build nucleowl55jc
+
+package machine
+
+import (
+	"device/stm32"
+	"runtime/interrupt"
+)
+
+const (
+	LED_BLUE  = PB15
+	LED_GREEN = PB9
+	LED_RED   = PB11
+	LED       = LED_RED
+
+	BTN1   = PA0
+	BTN2   = PA1
+	BTN3   = PC6
+	BUTTON = BTN1
+
+	// SubGhz (SPI3)
+	SPI0_NSS_PIN = PA4
+	SPI0_SCK_PIN = PA5
+	SPI0_SDO_PIN = PA6
+	SPI0_SDI_PIN = PA7
+
+	//MCU USART1
+	UART1_TX_PIN = PB6
+	UART1_RX_PIN = PB7
+
+	//MCU USART2
+	UART2_RX_PIN = PA3
+	UART2_TX_PIN = PA2
+
+	// DEFAULT USART
+	UART_RX_PIN = UART2_RX_PIN
+	UART_TX_PIN = UART2_TX_PIN
+)
+
+var (
+	// STM32 UART2 is connected to the embedded STLINKV3 Virtual Com Port
+	UART0  = &_UART0
+	_UART0 = UART{
+		Buffer:            NewRingBuffer(),
+		Bus:               stm32.USART2,
+		TxAltFuncSelector: 7,
+		RxAltFuncSelector: 7,
+	}
+
+	// UART1 is free
+	UART1  = &_UART1
+	_UART1 = UART{
+		Buffer:            NewRingBuffer(),
+		Bus:               stm32.USART1,
+		TxAltFuncSelector: 7,
+		RxAltFuncSelector: 7,
+	}
+
+	DefaultUART = UART0
+
+	// SPI
+	SPI3 = SPI{
+		Bus: stm32.SPI3,
+	}
+)
+
+func init() {
+	// Enable UARTs Interrupts
+	UART0.Interrupt = interrupt.New(stm32.IRQ_USART2, _UART0.handleInterrupt)
+	UART1.Interrupt = interrupt.New(stm32.IRQ_USART1, _UART1.handleInterrupt)
+}