From 48cd21d816d232fca473867441572f15af0e31f5 Mon Sep 17 00:00:00 2001
From: Pekka Vainio <pekka.vainio@iki.fi>
Date: Mon, 1 Nov 2021 14:15:34 +0200
Subject: [PATCH] Add automatic self calibration

---
 scd30.go      |  7 +++++++
 scd30_test.go | 26 +++++++++++---------------
 2 files changed, 18 insertions(+), 15 deletions(-)

diff --git a/scd30.go b/scd30.go
index e4ab0da..5ccb58e 100644
--- a/scd30.go
+++ b/scd30.go
@@ -139,6 +139,13 @@ func (dev SCD30) HasMeasurement() (bool, error) {
 	}
 }
 
+// SetAutomaticSelfCalibration, 1 on, 0 off
+func (dev SCD30) SetAutomaticSelfCalibration(value uint16) error {
+	mutex.Lock()
+	defer mutex.Unlock()
+	return dev.sendCommandArg(0x5306, value)
+}
+
 func (dev SCD30) readData(len int) ([]byte, error) {
 
 	data := make([]byte, len)
diff --git a/scd30_test.go b/scd30_test.go
index ec3d704..f366d78 100644
--- a/scd30_test.go
+++ b/scd30_test.go
@@ -1,9 +1,6 @@
 package scd30
 
 import (
-	"encoding/binary"
-	"fmt"
-	"math"
 	"testing"
 
 	"periph.io/x/conn/v3/i2c/i2ctest"
@@ -49,18 +46,17 @@ func TestSetTemperatureOffset(t *testing.T) {
 	assertNoError(t, err)
 }
 
-func printFloat(f float32) {
-	bits := math.Float32bits(f)
-	data := make([]byte, 4)
-	binary.BigEndian.PutUint32(data, bits)
-	var out []byte
-	crcdata := []byte{data[0], data[1]}
-	out = append(out, crcdata...)
-	out = append(out, crc(crcdata))
-	crcdata = []byte{data[2], data[3]}
-	out = append(out, crcdata...)
-	out = append(out, crc(crcdata))
-	fmt.Printf("f %f out %#v", f, out)
+func TestSetAutomaticSelfCalibration(t *testing.T) {
+
+	bus := &i2ctest.Playback{
+		Ops: []i2ctest.IO{
+			{Addr: addr, W: []byte{0x53, 0x06, 0x0, 0x0, 0x81}, R: nil},
+		},
+	}
+
+	scd30, _ := Open(bus)
+	err := scd30.SetAutomaticSelfCalibration(0)
+	assertNoError(t, err)
 }
 
 func TestHasMeasurement(t *testing.T) {