stm32: i2c implementation for F7, L5 and L4 MCUs

src/machine/board_nucleol552ze.go

@@ -41,6 +41,20 @@ var (
 	UART1 = &UART0
 )
 
+const (
+	I2C0_SCL_PIN = PB8
+	I2C0_SDA_PIN = PB9
+)
+
+var (
+	// I2C1 is documented, alias to I2C0 as well
+	I2C1 = &I2C{
+		Bus:             stm32.I2C1,
+		AltFuncSelector: 4,
+	}
+	I2C0 = I2C1
+)
+
 func init() {
 	UART0.Interrupt = interrupt.New(stm32.IRQ_LPUART1, UART0.handleInterrupt)
 }