ds3231: basic support for DS3231 RTC device

examples/ds3231/main.go

@@ -0,0 +1,45 @@
+// Connects to an MAG3110 I2C magnetometer.
+package main
+
+import (
+	"machine"
+	"time"
+
+	"fmt"
+
+	"github.com/tinygo-org/drivers/ds3231"
+)
+
+func main() {
+	machine.I2C0.Configure(machine.I2CConfig{})
+
+	rtc := ds3231.New(machine.I2C0)
+	rtc.Configure()
+
+	valid := rtc.IsTimeValid()
+	if !valid {
+		date := time.Date(2019, 12, 05, 20, 34, 12, 0, time.UTC)
+		rtc.SetTime(date)
+	}
+
+	running := rtc.IsRunning()
+	if !running {
+		err := rtc.SetRunning(true)
+		if err != nil {
+			fmt.Println("Error configuring RTC")
+		}
+	}
+
+	for {
+		dt, err := rtc.ReadTime()
+		if err != nil {
+			fmt.Println("Error reading date:", err)
+		} else {
+			fmt.Printf("Date: %d/%s/%02d %02d:%02d:%02d \r\n", dt.Year(), dt.Month(), dt.Day(), dt.Hour(), dt.Minute(), dt.Second())
+		}
+		temp, _ := rtc.ReadTemperature()
+		fmt.Printf("Temperature: %.2f ºC \r\n", float32(temp)/1000)
+
+		time.Sleep(time.Second * 1)
+	}
+}