Add: 1251 5x7 font

pkg/mt12232a/mt12232a.go

@@ -10,6 +10,10 @@ import (
 	"github.com/stianeikeland/go-rpio/v4"
 )
 
+const (
+	waitReadyTimeout = time.Microsecond
+)
+
 type mt12232a struct {
 	logger *log.Logger
 
@@ -154,7 +158,7 @@ func (d *mt12232a) readByte(cd, cs rpio.State) (byte, error) {
 func (d *mt12232a) waitReady(cs rpio.State) error {
 	// d.pinCS.Write(cs) // Select cristals
 	// return d.dev.WaitReady()
-	time.Sleep(time.Microsecond)
+	time.Sleep(waitReadyTimeout)
 	return nil
 }