Fix I2C configuration for xiao-rp2040 and xiao-ble

Author: sago35

targets/sgkey/main.go

@@ -29,14 +29,22 @@ type RCS struct {
 	state    keyboard.State
 }
 
+var (
+	i2c    = machine.I2C0
+	sclPin machine.Pin
+	sdaPin machine.Pin
+)
+
 func run() error {
-	machine.I2C0.Configure(machine.I2CConfig{
+	i2c.Configure(machine.I2CConfig{
 		Frequency: machine.TWI_FREQ_400KHZ,
+		SCL:       sclPin,
+		SDA:       sdaPin,
 	})
 
 	ch := make(chan RCS, 16)
 
-	display := ssd1306.NewI2C(machine.I2C0)
+	display := ssd1306.NewI2C(i2c)
 	display.Configure(ssd1306.Config{
 		Address: 0x3C,
 		Width:   128,

targets/sgkey/xiao-ble.go

@@ -0,0 +1,12 @@
+//go:build xiao_ble
+
+package main
+
+import (
+	"machine"
+)
+
+func init() {
+	sclPin = machine.SCL0_PIN
+	sdaPin = machine.SDA0_PIN
+}

targets/sgkey/xiao-rp2040.go

@@ -0,0 +1,11 @@
+//go:build xiao_rp2040
+
+package main
+
+import (
+	"machine"
+)
+
+func init() {
+	i2c = machine.I2C1
+}