tm1637: add support for tm1637 7-segment LED

examples/tm1637/main.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+	"machine"
+	"time"
+
+	"tinygo.org/x/drivers/tm1637"
+)
+
+func main() {
+
+	tm := tm1637.New(machine.D2, machine.D3, 7) // clk, dio, brightness
+	tm.Configure()
+
+	tm.ClearDisplay()
+
+	tm.DisplayText([]byte("Tiny"))
+	time.Sleep(time.Millisecond * 1000)
+
+	tm.ClearDisplay()
+
+	tm.DisplayChr(byte('G'), 1)
+	tm.DisplayDigit(0, 2) // looks like O
+	time.Sleep(time.Millisecond * 1000)
+
+	tm.DisplayClock(12, 59, true)
+
+	for i := uint8(0); i < 8; i++ {
+		tm.Brightness(i)
+		time.Sleep(time.Millisecond * 200)
+	}
+
+	i := int16(0)
+	for {
+		tm.DisplayNumber(i)
+		i++
+		time.Sleep(time.Millisecond * 50)
+	}
+
+}