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devices/mcp9808/mcp9808_test.go

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// Copyright 2018 The Periph Authors. All rights reserved.
// Use of this source code is governed under the Apache License, Version 2.0
// that can be found in the LICENSE file.
package mcp9808
import (
"encoding/binary"
"reflect"
"testing"
"time"
"periph.io/x/conn/i2c"
"periph.io/x/conn/i2c/i2ctest"
"periph.io/x/conn/mmr"
"periph.io/x/conn/physic"
)
func TestNew(t *testing.T) {
tests := []struct {
name string
opts Opts
tx []i2ctest.IO
want error
}{
{
name: "defaults",
opts: DefaultOpts,
tx: []i2ctest.IO{
{Addr: 0x18, W: []byte{resolutionConfig, 0x03}, R: []byte{}},
{Addr: 0x18, W: []byte{configuration, 0x00, 0x00}, R: []byte{}},
},
want: nil,
},
{
name: "bad address",
opts: Opts{Addr: 0x40},
want: errAddressOutOfRange,
},
{
name: "io error",
opts: Opts{Addr: 0x18},
want: errWritingResolution,
},
{
name: "enabled error",
opts: DefaultOpts,
tx: []i2ctest.IO{
{Addr: 0x18, W: []byte{resolutionConfig, 0x03}, R: []byte{}},
},
want: errWritingConfiguration,
},
}
for _, tt := range tests {
bus := i2ctest.Playback{
Ops: tt.tx,
DontPanic: true,
}
_, err := New(&bus, &tt.opts)
if err != tt.want {
t.Errorf("New(%s) expected %v but got %v ", tt.name, tt.want, err)
}
}
}
func TestSense(t *testing.T) {
tests := []struct {
name string
want physic.Temperature
tx []i2ctest.IO
enabled bool
err error
}{
{
name: "0C",
tx: []i2ctest.IO{
{Addr: 0x18, W: []byte{temperature}, R: []byte{0x00, 0x00}},
},
enabled: true,
want: physic.ZeroCelsius,
err: nil,
},
{
name: "10C",
tx: []i2ctest.IO{
{Addr: 0x18, W: []byte{temperature}, R: []byte{0x00, 0xa0}},
},
enabled: true,
want: physic.ZeroCelsius + 10*physic.Kelvin,
err: nil,
},
{
name: "-10C",
tx: []i2ctest.IO{
// 0x1f60 is -10°C in two's complement. See page 24-25 of the datasheet.
{Addr: 0x18, W: []byte{temperature}, R: []byte{0x1f, 0x60}},
},
enabled: true,
want: physic.ZeroCelsius - 10*physic.Kelvin,
err: nil,
},
{
name: "io error",
tx: []i2ctest.IO{},
enabled: true,
err: errReadTemperature,
},
{
name: "enable error",
enabled: false,
want: physic.ZeroCelsius + 10*physic.Kelvin,
err: errWritingConfiguration,
},
}
for _, tt := range tests {
bus := i2ctest.Playback{
Ops: tt.tx,
DontPanic: true,
}
mcp9808 := &Dev{
m: mmr.Dev8{
Conn: &i2c.Dev{Bus: &bus, Addr: 0x18},
Order: binary.BigEndian},
enabled: tt.enabled,
}
e := &physic.Env{}
err := mcp9808.Sense(e)
if err == nil && tt.want != e.Temperature {
t.Errorf("%s Sense() expected %v but got %v ", tt.name, tt.want, e.Temperature)
}
if err != tt.err {
t.Errorf("%s Sense() expected %v but got %v ", tt.name, tt.err, err)
}
}
}
func TestSenseContinuous(t *testing.T) {
tests := []struct {
name string
want physic.Temperature
res resolution
interval time.Duration
tx []i2ctest.IO
enabled bool
Halt bool
err error
}{
{
name: "errTooShortInterval Max",
res: Maximum,
interval: 249 * time.Millisecond,
err: errTooShortInterval,
},
{
name: "errTooShortInterval High",
res: High,
interval: 129 * time.Millisecond,
err: errTooShortInterval,
},
{
name: "errTooShortInterval Med",
res: Medium,
interval: 64 * time.Millisecond,
err: errTooShortInterval,
},
{
name: "errTooShortInterval Low",
res: Low,
interval: 29 * time.Millisecond,
err: errTooShortInterval,
},
{
name: "Halt",
tx: []i2ctest.IO{
{Addr: 0x18, W: []byte{temperature}, R: []byte{0x00, 0xa0}},
{Addr: 0x18, W: []byte{configuration, 0x01, 0x00}, R: nil},
},
want: physic.ZeroCelsius + 10*physic.Celsius,
res: Low,
interval: 30 * time.Millisecond,
enabled: true,
Halt: true,
err: nil,
},
}
for _, tt := range tests {
bus := i2ctest.Playback{
Ops: tt.tx,
DontPanic: true,
}
mcp9808 := &Dev{
m: mmr.Dev8{
Conn: &i2c.Dev{Bus: &bus, Addr: 0x18},
Order: binary.BigEndian,
},
res: tt.res,
enabled: tt.enabled,
stop: make(chan struct{}, 1),
}
env, err := mcp9808.SenseContinuous(tt.interval)
if tt.Halt {
e := <-env
err := mcp9808.Halt()
if err != tt.err {
t.Errorf("SenseContinuous() %s wanted err: %v, but got: %v", tt.name, tt.err, err)
}
if err == nil && e.Temperature != tt.want {
t.Errorf("SenseContinuous() %s wanted %v, but got: %v", tt.name, tt.want, e.Temperature)
}
}
if err != tt.err {
t.Errorf("SenseContinuous() %s wanted err: %v, but got: %v", tt.name, tt.err, err)
}
mcp9808.Halt()
}
}
func TestPrecision(t *testing.T) {
tests := []struct {
name string
want physic.Temperature
res resolution
}{
{
name: "Maximum",
want: 62500 * physic.MicroKelvin,
res: Maximum,
},
{
name: "High",
want: 125 * physic.MilliKelvin,
res: High,
},
{
name: "Medium",
want: 250 * physic.MilliKelvin,
res: Medium,
},
{
name: "Low",
want: 500 * physic.MilliKelvin,
res: Low,
},
}
for _, tt := range tests {
d := &Dev{res: tt.res}
e := &physic.Env{}
d.Precision(e)
if e.Temperature != tt.want {
t.Errorf("Precision(%s) wanted %v but got %v", tt.name, tt.want, e.Temperature)
}
}
}
func TestSenseTemp(t *testing.T) {
tests := []struct {
name string
want physic.Temperature
tx []i2ctest.IO
err error
}{
{
name: "0C",
tx: []i2ctest.IO{
{Addr: 0x18, W: []byte{temperature}, R: []byte{0x00, 0x00}},
},
want: physic.ZeroCelsius,
err: nil,
},
{
name: "10C",
tx: []i2ctest.IO{
{Addr: 0x18, W: []byte{temperature}, R: []byte{0x00, 0xa0}},
},
want: physic.ZeroCelsius + 10*physic.Kelvin,
err: nil,
},
{
name: "-10C",
tx: []i2ctest.IO{
// 0x1f60 is -10°C in two's complement. See page 24-25 of the datasheet.
{Addr: 0x18, W: []byte{temperature}, R: []byte{0x1f, 0x60}},
},
want: physic.ZeroCelsius - 10*physic.Kelvin,
err: nil,
},
{
name: "io error",
tx: []i2ctest.IO{},
err: errReadTemperature,
},
}
for _, tt := range tests {
bus := i2ctest.Playback{
Ops: tt.tx,
DontPanic: true,
}
mcp9808 := &Dev{
m: mmr.Dev8{
Conn: &i2c.Dev{Bus: &bus, Addr: 0x18},
Order: binary.BigEndian},
enabled: true,
}
got, err := mcp9808.SenseTemp()
if tt.want != got {
t.Errorf("%s SenseTemp() expected %v but got %v ", tt.name, tt.want, got)
}
if err != tt.err {
t.Errorf("%s SenseTemp() expected %v but got %v ", tt.name, tt.err, err)
}
}
}
func TestSenseWithAlerts(t *testing.T) {
tests := []struct {
name string
critical physic.Temperature
upper physic.Temperature
lower physic.Temperature
temp physic.Temperature
alerts []Alert
tx []i2ctest.IO
err error
}{
{
name: "read no alert",
critical: physic.ZeroCelsius + 10*physic.Kelvin,
upper: physic.ZeroCelsius + 5*physic.Kelvin,
lower: physic.ZeroCelsius,
temp: physic.ZeroCelsius + 1*physic.Kelvin,
alerts: nil,
tx: []i2ctest.IO{
{Addr: 0x18, W: []byte{critAlert, 0x00, 0xa0}, R: nil},
{Addr: 0x18, W: []byte{upperAlert, 0x00, 0x50}, R: nil},
{Addr: 0x18, W: []byte{lowerAlert, 0x00, 0x00}, R: nil},
{Addr: 0x18, W: []byte{temperature}, R: []byte{0x00, 0x10}},
},
err: nil,
},
{
name: "get lower Alert",
critical: physic.ZeroCelsius + 10*physic.Kelvin,
upper: physic.ZeroCelsius + 5*physic.Kelvin,
lower: physic.ZeroCelsius,
temp: physic.ZeroCelsius - 1*physic.Kelvin,
alerts: []Alert{
{"lower", physic.ZeroCelsius},
},
tx: []i2ctest.IO{
{Addr: 0x18, W: []byte{critAlert, 0x00, 0xa0}, R: nil},
{Addr: 0x18, W: []byte{upperAlert, 0x00, 0x50}, R: nil},
{Addr: 0x18, W: []byte{lowerAlert, 0x00, 0x00}, R: nil},
// 0x3ff0 is -1°C in two's complement with the lower alert bit set (bit 13).
// See page 24-25 of the datasheet.
{Addr: 0x18, W: []byte{temperature}, R: []byte{0x3f, 0xf0}},
{Addr: 0x18, W: []byte{lowerAlert}, R: []byte{0x00, 0x00}},
},
err: nil,
},
{
name: "get upper Alert",
critical: physic.ZeroCelsius + 10*physic.Kelvin,
upper: physic.ZeroCelsius + 5*physic.Kelvin,
lower: physic.ZeroCelsius,
temp: physic.ZeroCelsius + 7*physic.Kelvin,
alerts: []Alert{
{"upper", physic.ZeroCelsius + 5*physic.Kelvin},
},
tx: []i2ctest.IO{
{Addr: 0x18, W: []byte{critAlert, 0x00, 0xa0}, R: nil},
{Addr: 0x18, W: []byte{upperAlert, 0x00, 0x50}, R: nil},
{Addr: 0x18, W: []byte{lowerAlert, 0x00, 0x00}, R: nil},
{Addr: 0x18, W: []byte{temperature}, R: []byte{0x40, 0x70}},
{Addr: 0x18, W: []byte{upperAlert}, R: []byte{0x00, 0x50}},
},
err: nil,
},
{
name: "get critical Alert",
critical: physic.ZeroCelsius + 10*physic.Kelvin,
upper: physic.ZeroCelsius + 5*physic.Kelvin,
lower: physic.ZeroCelsius,
temp: physic.ZeroCelsius + 15*physic.Kelvin,
alerts: []Alert{
{"critical", physic.ZeroCelsius + 10*physic.Kelvin},
{"upper", physic.ZeroCelsius + 5*physic.Kelvin},
},
tx: []i2ctest.IO{
{Addr: 0x18, W: []byte{critAlert, 0x00, 0xa0}, R: nil},
{Addr: 0x18, W: []byte{upperAlert, 0x00, 0x50}, R: nil},
{Addr: 0x18, W: []byte{lowerAlert, 0x00, 0x00}, R: nil},
{Addr: 0x18, W: []byte{temperature}, R: []byte{0xc0, 0xf0}},
{Addr: 0x18, W: []byte{critAlert}, R: []byte{0x00, 0xa0}},
{Addr: 0x18, W: []byte{upperAlert}, R: []byte{0x00, 0x50}},
},
err: nil,
},
{
name: "set critical error",
critical: physic.ZeroCelsius + 10*physic.Kelvin,
upper: physic.ZeroCelsius + 5*physic.Kelvin,
lower: physic.ZeroCelsius,
err: errWritingCritAlert,
},
{
name: "set upper error",
critical: physic.ZeroCelsius + 10*physic.Kelvin,
upper: physic.ZeroCelsius + 5*physic.Kelvin,
lower: physic.ZeroCelsius,
tx: []i2ctest.IO{
{Addr: 0x18, W: []byte{critAlert, 0x00, 0xa0}, R: nil},
},
err: errWritingUpperAlert,
},
{
name: "set lower error",
critical: physic.ZeroCelsius + 10*physic.Kelvin,
upper: physic.ZeroCelsius + 5*physic.Kelvin,
lower: physic.ZeroCelsius,
tx: []i2ctest.IO{
{Addr: 0x18, W: []byte{critAlert, 0x00, 0xa0}, R: nil},
{Addr: 0x18, W: []byte{upperAlert, 0x00, 0x50}, R: nil},
},
err: errWritingLowerAlert,
},
{
name: "invalid alert config",
critical: physic.ZeroCelsius + 1*physic.Kelvin,
upper: physic.ZeroCelsius + 5*physic.Kelvin,
lower: physic.ZeroCelsius,
tx: []i2ctest.IO{},
err: errAlertInvalid,
},
{
name: "temperature io error",
critical: physic.ZeroCelsius + 10*physic.Kelvin,
upper: physic.ZeroCelsius + 5*physic.Kelvin,
lower: physic.ZeroCelsius,
tx: []i2ctest.IO{
{Addr: 0x18, W: []byte{critAlert, 0x00, 0xa0}, R: nil},
{Addr: 0x18, W: []byte{upperAlert, 0x00, 0x50}, R: nil},
{Addr: 0x18, W: []byte{lowerAlert, 0x00, 0x00}, R: nil},
},
err: errReadTemperature,
},
{
name: "read critical io error",
critical: physic.ZeroCelsius + 10*physic.Kelvin,
upper: physic.ZeroCelsius + 5*physic.Kelvin,
lower: physic.ZeroCelsius,
temp: physic.ZeroCelsius + 15*physic.Kelvin,
tx: []i2ctest.IO{
{Addr: 0x18, W: []byte{critAlert, 0x00, 0xa0}, R: nil},
{Addr: 0x18, W: []byte{upperAlert, 0x00, 0x50}, R: nil},
{Addr: 0x18, W: []byte{lowerAlert, 0x00, 0x00}, R: nil},
{Addr: 0x18, W: []byte{temperature}, R: []byte{0xc0, 0xf0}},
},
err: errReadCriticalAlert,
},
{
name: "read upper io error",
critical: physic.ZeroCelsius + 10*physic.Kelvin,
upper: physic.ZeroCelsius + 5*physic.Kelvin,
lower: physic.ZeroCelsius,
temp: physic.ZeroCelsius + 15*physic.Kelvin,
tx: []i2ctest.IO{
{Addr: 0x18, W: []byte{critAlert, 0x00, 0xa0}, R: nil},
{Addr: 0x18, W: []byte{upperAlert, 0x00, 0x50}, R: nil},
{Addr: 0x18, W: []byte{lowerAlert, 0x00, 0x00}, R: nil},
{Addr: 0x18, W: []byte{temperature}, R: []byte{0xc0, 0xf0}},
{Addr: 0x18, W: []byte{critAlert}, R: []byte{0x00, 0xa0}},
},
err: errReadUpperAlert,
},
{
name: "read lower io error",
critical: physic.ZeroCelsius + 10*physic.Kelvin,
upper: physic.ZeroCelsius + 5*physic.Kelvin,
lower: physic.ZeroCelsius,
temp: physic.ZeroCelsius - 1*physic.Kelvin,
alerts: nil,
tx: []i2ctest.IO{
{Addr: 0x18, W: []byte{critAlert, 0x00, 0xa0}, R: nil},
{Addr: 0x18, W: []byte{upperAlert, 0x00, 0x50}, R: nil},
{Addr: 0x18, W: []byte{lowerAlert, 0x00, 0x00}, R: nil},
// 0x3ff0 is -1°C in two's complement with the lower alert bit set (bit 13).
// See page 24-25 of the datasheet.
{Addr: 0x18, W: []byte{temperature}, R: []byte{0x3f, 0xf0}},
},
err: errReadLowerAlert,
},
}
for _, tt := range tests {
bus := i2ctest.Playback{
Ops: tt.tx,
DontPanic: true,
}
mcp9808 := &Dev{
m: mmr.Dev8{
Conn: &i2c.Dev{Bus: &bus, Addr: 0x18},
Order: binary.BigEndian},
enabled: true,
}
temp, alerts, err := mcp9808.SenseWithAlerts(tt.lower, tt.upper, tt.critical)
if err != tt.err {
t.Errorf("SenseWithAlerts(%s) wanted err: %v but got: %v", tt.name, tt.err, err)
}
if temp != tt.temp {
t.Errorf("SenseWithAlerts(%s) wanted temp: %s but got: %s", tt.name, tt.temp, temp)
}
if !reflect.DeepEqual(alerts, tt.alerts) {
t.Errorf("SenseWithAlerts(%s) expected alerts %+v but got %+v ", tt.name, tt.alerts, alerts)
}
}
}
func TestDevHalt(t *testing.T) {
tests := []struct {
name string
tx []i2ctest.IO
enabled bool
want bool
err error
}{
{
name: "shutdown",
tx: []i2ctest.IO{
{Addr: 0x18, W: []byte{configuration, 0x01, 0x00}, R: nil},
},
enabled: true,
want: false,
err: nil,
},
{
name: "io error",
tx: []i2ctest.IO{
// {Addr: 0x18, W: []byte{configuration, 0x01, 0x00}, R: nil},
},
enabled: true,
want: true,
err: errWritingConfiguration,
},
}
for _, tt := range tests {
bus := i2ctest.Playback{
Ops: tt.tx,
DontPanic: true,
}
mcp9808 := &Dev{
m: mmr.Dev8{
Conn: &i2c.Dev{Bus: &bus, Addr: 0x18},
Order: binary.BigEndian},
enabled: tt.enabled,
}
if err := mcp9808.Halt(); err != tt.err {
t.Errorf("Halt(%s) wanted error: %v but got: %v", tt.name, tt.err, err)
}
if mcp9808.enabled != tt.want {
t.Errorf("Halt(%s) expected dev to be: %t but is: %t", tt.name, tt.want, mcp9808.enabled)
}
}
}
func TestDevString(t *testing.T) {
mcp9808 := &Dev{}
want := "MCP9808"
if want != mcp9808.String() {
t.Errorf("mpc9808.String() expected %s but got %s", want, mcp9808.String())
}
}
func TestDev_enable(t *testing.T) {
tests := []struct {
name string
tx []i2ctest.IO
enabled bool
want bool
err error
}{
{
name: "shutdown",
tx: []i2ctest.IO{
{Addr: 0x18, W: []byte{configuration, 0x00, 0x00}, R: nil},
},
enabled: false,
want: true,
err: nil,
},
{
name: "io error",
tx: []i2ctest.IO{
// {Addr: 0x18, W: []byte{configuration, 0x01, 0x00}, R: nil},
},
enabled: false,
want: false,
err: errWritingConfiguration,
},
}
for _, tt := range tests {
bus := i2ctest.Playback{
Ops: tt.tx,
DontPanic: true,
}
mcp9808 := &Dev{
m: mmr.Dev8{
Conn: &i2c.Dev{Bus: &bus, Addr: 0x18},
Order: binary.BigEndian},
enabled: tt.enabled,
}
if err := mcp9808.enable(); err != tt.err {
t.Errorf("enable(%s) wanted error: %v but got: %v", tt.name, tt.err, err)
}
if mcp9808.enabled != tt.want {
t.Errorf("enable(%s) expected dev to be: %t but is: %t", tt.name, tt.want, mcp9808.enabled)
}
}
}
func TestDev_setResolution(t *testing.T) {
succeeds := []struct {
name string
res resolution
tx []i2ctest.IO
err error
}{
{
name: "Low",
res: Low,
tx: []i2ctest.IO{
{Addr: 0x18, W: []byte{resolutionConfig, 0x00}, R: nil},
},
err: nil,
}, {
name: "Medium",
res: Medium,
tx: []i2ctest.IO{
{Addr: 0x18, W: []byte{resolutionConfig, 0x01}, R: nil},
},
err: nil,
}, {
name: "High",
res: High,
tx: []i2ctest.IO{
{Addr: 0x18, W: []byte{resolutionConfig, 0x02}, R: nil},
},
err: nil,
}, {
name: "Maximum",
res: Maximum,
tx: []i2ctest.IO{
{Addr: 0x18, W: []byte{resolutionConfig, 0x03}, R: nil},
},
err: nil,
},
}
fails := []struct {
name string
res resolution
tx []i2ctest.IO
err error
}{
{
name: "Low",
res: Low,
err: errWritingResolution,
}, {
name: "Medium",
res: Medium,
err: errWritingResolution,
}, {
name: "High",
res: High,
err: errWritingResolution,
}, {
name: "Maximum",
res: Maximum,
err: errWritingResolution,
}, {
name: "Unknown",
res: resolution(5),
err: errInvalidResolution,
},
}
for _, tt := range succeeds {
bus := i2ctest.Playback{
Ops: tt.tx,
DontPanic: true,
}
mcp9808 := &Dev{
m: mmr.Dev8{
Conn: &i2c.Dev{Bus: &bus, Addr: 0x18},
Order: binary.BigEndian},
}
if err := mcp9808.setResolution(tt.res); err != tt.err {
t.Errorf("setResolution(%s) expected %v but got %v", tt.name, tt.err, err)
}
}
for _, tt := range fails {
bus := i2ctest.Playback{
Ops: tt.tx,
DontPanic: true,
}
mcp9808 := &Dev{
m: mmr.Dev8{
Conn: &i2c.Dev{Bus: &bus, Addr: 0x18},
Order: binary.BigEndian},
}
if err := mcp9808.setResolution(tt.res); err != tt.err {
t.Errorf("setResolution(%s) expected %v but got %v", tt.name, tt.err, err)
}
}
}
func TestDev_setCriticalAlert(t *testing.T) {
tests := []struct {
name string
alert physic.Temperature
crit physic.Temperature
tx []i2ctest.IO
err error
}{
{
name: "0C",
alert: physic.ZeroCelsius,
tx: []i2ctest.IO{
{Addr: 0x18, W: []byte{critAlert, 0x00, 0x00}, R: nil},
},
err: nil,
},
{
name: "126C",
alert: physic.ZeroCelsius + 126*physic.Kelvin,
tx: []i2ctest.IO{},
err: errAlertOutOfRange,
},
{
name: "io error",
alert: physic.ZeroCelsius,
tx: []i2ctest.IO{},
err: errWritingCritAlert,
},
{
name: "nop",
alert: physic.ZeroCelsius,
crit: physic.ZeroCelsius,
tx: []i2ctest.IO{},
err: nil,
},
}
for _, tt := range tests {
bus := i2ctest.Playback{
Ops: tt.tx,
DontPanic: true,
}
mcp9808 := &Dev{
m: mmr.Dev8{
Conn: &i2c.Dev{Bus: &bus, Addr: 0x18},
Order: binary.BigEndian},
critical: tt.crit,
}
if err := mcp9808.setCriticalAlert(tt.alert); err != tt.err {
t.Errorf("setCriticalAlert(%s) expected %v but got %v", tt.name, tt.err, err)
}
}
}
func TestDev_setUpperAlert(t *testing.T) {
tests := []struct {
name string
alert physic.Temperature
tx []i2ctest.IO
upper physic.Temperature
err error
}{
{
name: "0C",
alert: physic.ZeroCelsius,
tx: []i2ctest.IO{
{Addr: 0x18, W: []byte{upperAlert, 0x00, 0x00}, R: nil},
},
err: nil,
},
{
name: "126C",
alert: physic.ZeroCelsius + 126*physic.Kelvin,
tx: []i2ctest.IO{},
err: errAlertOutOfRange,
},
{
name: "io error",
alert: physic.ZeroCelsius,
tx: []i2ctest.IO{},
err: errWritingUpperAlert,
},
{
name: "nop",
alert: physic.ZeroCelsius,
upper: physic.ZeroCelsius,
tx: []i2ctest.IO{},
err: nil,
},
}
for _, tt := range tests {
bus := i2ctest.Playback{
Ops: tt.tx,
DontPanic: true,
}
mcp9808 := &Dev{
m: mmr.Dev8{
Conn: &i2c.Dev{Bus: &bus, Addr: 0x18},
Order: binary.BigEndian},
upper: tt.upper,
}
if err := mcp9808.setUpperAlert(tt.alert); err != tt.err {
t.Errorf("setUpperAlert(%s) expected %v but got %v", tt.name, tt.err, err)
}
}
}
func TestDev_setLowerAlert(t *testing.T) {
tests := []struct {
name string
alert physic.Temperature
tx []i2ctest.IO
lower physic.Temperature
err error
}{
{
name: "0C",
alert: physic.ZeroCelsius,
tx: []i2ctest.IO{
{Addr: 0x18, W: []byte{lowerAlert, 0x00, 0x00}, R: nil},
},
err: nil,
},
{
name: "126C",
alert: physic.ZeroCelsius + 126*physic.Kelvin,
tx: []i2ctest.IO{},
err: errAlertOutOfRange,
},
{
name: "io error",
alert: physic.ZeroCelsius,
tx: []i2ctest.IO{},
err: errWritingLowerAlert,
},
{
name: "nop",
alert: physic.ZeroCelsius,
lower: physic.ZeroCelsius,
tx: []i2ctest.IO{},
err: nil,
},
}
for _, tt := range tests {
bus := i2ctest.Playback{
Ops: tt.tx,
DontPanic: true,
}
mcp9808 := &Dev{
m: mmr.Dev8{
Conn: &i2c.Dev{Bus: &bus, Addr: 0x18},
Order: binary.BigEndian},
lower: tt.lower,
}
if err := mcp9808.setLowerAlert(tt.alert); err != tt.err {
t.Errorf("setLowerAlert(%s) expected %v but got %v", tt.name, tt.err, err)
}
}
}
func Test_bitsToTemperature(t *testing.T) {
tests := []struct {
name string
bits uint16
want physic.Temperature
}{
{"0°C", 0x0000, physic.ZeroCelsius},
{"0.25°C", 0x0004, physic.ZeroCelsius + 250*physic.MilliKelvin},
{"0.9375°C", 0x000f, physic.ZeroCelsius + 937500*physic.MicroKelvin},
{"124.75°C", 0x07cc, physic.ZeroCelsius + 124750*physic.MilliKelvin},
// Negative values are in two's complement. See page 22 of the datasheet.
{"-0.25°C", 0x1ffc, physic.ZeroCelsius - 250*physic.MilliKelvin},
{"-39.75°C", 0x1d84, physic.ZeroCelsius - 39750*physic.MilliKelvin},
}
for _, tt := range tests {
if got := bitsToTemperature(tt.bits); got != tt.want {
t.Errorf("bitsToTemperature(%s) = %v, want %v", tt.name, got, tt.want)
}
}
}
func Test_alertTemperatureToBits(t *testing.T) {
succeeds := []struct {
name string
alert physic.Temperature
want uint16
}{
{"0°C", physic.ZeroCelsius, 0x0000},
{"0.25°C", physic.ZeroCelsius + 250*physic.MilliKelvin, 0x0004},
{"124.75°C", physic.ZeroCelsius + 124750*physic.MilliKelvin, 0x07cc},
// Negative values are in two's complement. See page 22 of the datasheet.
{"-0.25°C", physic.ZeroCelsius - 250*physic.MilliKelvin, 0x1ffc},
{"-39.75°C", physic.ZeroCelsius - 39750*physic.MilliKelvin, 0x1d84},
}
fails := []struct {
name string
alert physic.Temperature
want error
}{
{"126°C", physic.ZeroCelsius + 126*physic.Kelvin, errAlertOutOfRange},
{"-41°C", physic.ZeroCelsius - 41*physic.Kelvin, errAlertOutOfRange},
}
for _, tt := range succeeds {
got, err := alertTemperatureToBits(tt.alert)
if got != tt.want && err == nil {
t.Errorf("alertTemperatureToBits(%s) = %x, want %x", tt.name, got, tt.want)
}
if err != nil {
t.Errorf("alertTemperatureToBits(%s) got unexpected error: %v", tt.name, err)
}
}
for _, tt := range fails {
if _, err := alertTemperatureToBits(tt.alert); err == nil {
t.Errorf("alertTemperatureToBits(%s) expected error %v", tt.name, tt.want)
}
}
}
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