fix cpm value

Signed-off-by: Markus Blaschke <mblaschke82@gmail.com>
webdevops · Aug 17, 2021 · cc4aedb · cc4aedb
1 parent e176a89
commit cc4aedb
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/serial.go b/serial.go
@@ -115,7 +115,7 @@ func (d *GqGmcDevice) GetCpm() (cpm *float64) {
 	}
 
 	if buf, err := d.read(2); err == nil {
-		if len(buf) == 1 {
+		if len(buf) == 2 {
 			val := float64(binary.BigEndian.Uint16(buf))
 			cpm = &val
 		}