A simple heart rate monitor
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package main
import (
"encoding/binary"
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"fmt"
"image"
"image/color"
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"io/ioutil"
"log"
"os"
"path"
"time"
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"git.wow.st/gmp/ble"
"gopkg.in/yaml.v2"
"gioui.org/app"
"gioui.org/io/system"
"gioui.org/layout"
"gioui.org/f32"
"gioui.org/op"
"gioui.org/op/clip"
"gioui.org/op/paint"
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"gioui.org/text"
"gioui.org/unit"
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"gioui.org/widget"
"gioui.org/widget/material"
"gioui.org/font/gofont"
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)
type (
D = layout.Dimensions
C = layout.Context
)
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type conf struct {
Autoconnect string
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}
var Config conf
var conffile string
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func main() {
conffile = path.Join(getConfDir(), "config.yml")
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if _, err := os.Stat(conffile); os.IsNotExist(err) {
fd, err := os.Create(conffile)
if err != nil {
log.Fatal("Cannot create configuration file: ", err)
}
fd.Close()
}
confbytes, err := ioutil.ReadFile(conffile)
if err != nil {
log.Fatal("Cannot read configuration file: ", err)
}
if err = yaml.UnmarshalStrict(confbytes, &Config); err != nil {
log.Fatal("Cannot parse configuration file: ", err)
}
go eventloop()
app.Main()
}
func saveConfig() {
confbytes, err := yaml.Marshal(&Config)
if err != nil {
log.Fatal("Cannot encode configuration: ", err)
}
err = ioutil.WriteFile(conffile, confbytes, 0700)
}
func hrDecode(x []byte) int {
if len(x) < 4 {
return 0
}
flags := x[0]
if flags&0x80 != 0 { // uint16 format
return int(binary.BigEndian.Uint16(x[1:3]))
} else {
return int(x[1])
}
}
type Stopwatch struct {
lasttime time.Time
elapsed time.Time
running bool
startstopBtn *widget.Clickable
resetBtn *widget.Clickable
h, m, s int
}
func NewStopwatch() Stopwatch {
return Stopwatch{
startstopBtn: &widget.Clickable{},
resetBtn: &widget.Clickable{},
}
}
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func eventloop() {
w := app.NewWindow(
app.Size(unit.Dp(350), unit.Dp(600)),
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app.Title("HRM"),
)
th := material.NewTheme(gofont.Collection())
th.TextSize = unit.Sp(fontSize)
var ops op.Ops
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sysinset := &layout.Inset{}
resetSysinset := func(x system.Insets) {
sysinset.Top = x.Top
sysinset.Bottom = x.Bottom
sysinset.Left = x.Left
sysinset.Right = x.Right
}
margin := layout.UniformInset(unit.Dp(10))
b := ble.NewBLE()
state := "starting"
var hr int
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var periph ble.Peripheral
var wide bool
periphs := make([]ble.Peripheral, 0)
btns := make([]*widget.Clickable, 0)
backBtn := &widget.Clickable{}
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var page, offpage, scanpage, connpage, hrpage func(gtx C) D
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f := &layout.Flex{Axis: layout.Vertical}
offpage = func(gtx C) D {
return f.Layout(gtx,
layout.Rigid(func(gtx C) D {
return material.Body1(th, "Heart Rate Monitor").Layout(gtx)
}),
layout.Rigid(func(gtx C) D {
return material.Body1(th, "Bluetooth is Powered Off").Layout(gtx)
}),
)
}
appname := func(gtx C) D {
return layout.Center.Layout(gtx, func(gtx C) D {
return material.Body1(th, "Heart Rate Monitor").Layout(gtx)
})
}
appstate := func(gtx C) D {
return layout.Center.Layout(gtx, func(gtx C) D {
return material.Body1(th, state).Layout(gtx)
})
}
periphname := func(gtx C) D {
return layout.Center.Layout(gtx, func(gtx C) D {
return material.Body1(th, periph.Name).Layout(gtx)
})
}
leftbar := func(gtx C) D {
f := &layout.Flex{Axis: layout.Vertical}
return f.Layout(gtx,
layout.Rigid(appname),
layout.Rigid(func(gtx C) D {
return material.Body1(th, "").Layout(gtx)
}),
layout.Rigid(appstate),
)
}
scanlist := func(gtx C) D {
lst := &layout.List{Axis: layout.Vertical}
return lst.Layout(gtx, len(periphs), func(gtx C, i int) D {
gtx.Constraints.Min.X = gtx.Constraints.Max.X
ret := layout.UniformInset(unit.Dp(2)).Layout(gtx, func(gtx C) D {
return material.Button(th, btns[i], periphs[i].Name).Layout(gtx)
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})
if btns[i].Clicked() {
b.StopScan()
periph = periphs[i]
b.Connect(periph)
state = "connecting"
page = connpage
w.Invalidate()
}
return ret
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})
}
scanpage = func(gtx C) D {
if wide {
f2 := &layout.Flex{Axis: layout.Horizontal}
return f2.Layout(gtx,
layout.Rigid(leftbar),
layout.Flexed(1, scanlist),
)
} else {
return f.Layout(gtx,
layout.Rigid(appname),
layout.Rigid(appstate),
layout.Rigid(scanlist),
)
}
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}
connpage = func(gtx C) D {
return f.Layout(gtx,
layout.Rigid(appname),
layout.Rigid(appstate),
layout.Rigid(periphname),
layout.Rigid(func(gtx C) D {
ret := material.Button(th, backBtn, "Cancel").Layout(gtx)
if backBtn.Clicked() {
ble.CancelConnection(periph)
periphs = periphs[:0]
Config.Autoconnect = ""
saveConfig()
b.Scan()
state = "scanning"
page = scanpage
}
return ret
}),
)
}
hrcircle := func(gtx C) (int, D) {
var w, h1 float32
ret := layout.Center.Layout(gtx, func(gtx C) D {
blue := color.NRGBA{0x3f, 0x51, 0xb5, 255}
white := color.NRGBA{255, 255, 255, 255}
w, h1 = float32(gtx.Constraints.Max.X), float32(gtx.Constraints.Max.Y)
if w < h1 {
h1 = w
}
s2 := h1 * 0.9
p2a := f32.Point{(h1-s2)/2, (h1-s2)/2}
circle := clip.Circle{
Center: f32.Point{X: h1/2, Y: h1/2},
Radius: h1 / 2}.Op(gtx.Ops)
paint.FillShape(gtx.Ops, blue, circle)
circle = clip.Circle{
Center: f32.Point{X: h1/2, Y: h1/2},
Radius: h1 * 0.9 / 2}.Op(gtx.Ops)
paint.FillShape(gtx.Ops, white, circle)
op.Offset(p2a).Add(gtx.Ops)
gtx.Constraints.Max.X = int(s2)
gtx.Constraints.Max.Y = int(s2)
gtx.Constraints.Min.X = int(s2)
gtx.Constraints.Min.Y = int(s2)
l := material.H1(th, fmt.Sprintf("%d", hr))
l.Alignment = text.Middle
layout.Center.Layout(gtx, func(gtx C) D {
return l.Layout(gtx)
})
var ret D
ret.Size = image.Point{int(h1), int(h1)}
return ret
})
return int(h1), ret
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}
sw := NewStopwatch()
stopwatch := func(gtx C) D {
startstoptxt := "start"
if sw.running {
sw.elapsed = sw.elapsed.Add(time.Since(sw.lasttime))
startstoptxt = "stop"
}
sw.lasttime = time.Now()
f := layout.Flex{Axis: layout.Vertical}
return f.Layout(gtx,
layout.Rigid(func(gtx C) D {
return layout.Center.Layout(gtx, func(gtx C) D {
gtx.Constraints.Max.X = 1e6
return material.H4(th, sw.elapsed.Format("15:04:05.00")).Layout(gtx)
})
}),
layout.Rigid(func(gtx C) D {
f2 := layout.Flex{Axis: layout.Horizontal}
gtx.Constraints.Min.Y = 100
ret := f2.Layout(gtx,
layout.Flexed(0.5, func(gtx C) D {
return layout.UniformInset(unit.Dp(2)).Layout(gtx, func(gtx C) D {
return material.Button(th, sw.startstopBtn, startstoptxt).Layout(gtx)
})
}),
layout.Flexed(0.5, func(gtx C) D {
return layout.UniformInset(unit.Dp(2)).Layout(gtx, func(gtx C) D {
return material.Button(th, sw.resetBtn, "reset").Layout(gtx)
})
}),
)
if sw.startstopBtn.Clicked() {
if sw.running {
sw.running = false
} else {
sw.running = true
}
}
if sw.resetBtn.Clicked() {
sw.elapsed = time.Time{}
sw.running = false
}
return ret
}),
)
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}
swidth := new(int)
hrpage = func(gtx C) D {
var ret, ret2 D
stopbtn := func(gtx C) D {
gtx.Constraints.Min.Y = 100
return layout.UniformInset(unit.Dp(2)).Layout(gtx, func(gtx C) D {
return material.Button(th, backBtn, "Disconnect").Layout(gtx)
})
}
if wide {
f2 := &layout.Flex{Axis: layout.Horizontal}
ret = f2.Layout(gtx,
layout.Flexed(0.4, func(gtx C) D {
f3 := &layout.Flex{Axis: layout.Vertical}
c1 := layout.Rigid(func(gtx C) D {
ret2 = appname(gtx)
*swidth = ret2.Size.X
return ret2
})
c2 := layout.Rigid(func(gtx C) D {
ret2 = periphname(gtx)
s2 := ret2.Size.X
if s2 > *swidth {
*swidth = s2
}
return ret2
})
var c3 layout.FlexChild
if gtx.Constraints.Max.X > 370 {
c3 = layout.Rigid(stopwatch)
} else {
c3 = layout.Rigid(func(gtx C) D {
return D{}
})
}
c4 := layout.Rigid(stopbtn)
return f3.Layout(gtx,
c1,
layout.Rigid(appstate),
c2,
layout.Flexed(1.0, func(gtx C) D {
return material.Body1(th, "").Layout(gtx)
}),
c3,
c4,
)
}),
layout.Flexed(0.6, func(gtx C) D {
_, ret := hrcircle(gtx)
return ret
}),
)
} else { // !wide
c1 := layout.Rigid(func(gtx C) D {
return layout.Center.Layout(gtx, func(gtx C) D {
gtx.Constraints.Min.X = *swidth
gtx.Constraints.Max.X = *swidth
return stopwatch(gtx)
})
})
//swheight := gtx.Dimensions.Size.Y
c2 := layout.Rigid(func(gtx C) D {
return layout.Center.Layout(gtx, func(gtx C) D {
gtx.Constraints.Min.X = *swidth
gtx.Constraints.Max.X = *swidth
return stopbtn(gtx)
})
})
if gtx.Constraints.Max.Y < 775 {
//gtx.Constraints.Max.Y += swheight
ret = f.Layout(gtx,
layout.Rigid(appname),
layout.Rigid(appstate),
layout.Rigid(periphname),
layout.Flexed(1.0, func(gtx C) D {
*swidth, ret2 = hrcircle(gtx)
return ret2
}),
c2,
)
} else {
ret = f.Layout(gtx,
layout.Rigid(appname),
layout.Rigid(appstate),
layout.Rigid(periphname),
layout.Flexed(1.0, func(gtx C) D {
*swidth, ret2 = hrcircle(gtx)
return ret2
}),
c1,
c2,
)
}
}
if backBtn.Clicked() {
ble.Disconnect(periph)
periphs = periphs[:0]
Config.Autoconnect = ""
saveConfig()
b.Scan()
state = "scanning"
page = scanpage
}
return ret
}
page = offpage
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t := time.NewTicker(time.Second/30)
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for {
select {
case <-t.C:
w.Invalidate()
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case e := <-b.Events():
log.Print("<-b.Events")
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switch e := e.(type) {
case ble.UpdateStateEvent:
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fmt.Printf("UpdateState: %s\n", e.State)
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state = e.State
if state != "powered on" {
periphs = periphs[:0]
page = offpage
} else {
if Config.Autoconnect != "" && b.Connect(ble.Peripheral{Identifier: Config.Autoconnect}) {
state = "connecting"
page = connpage
} else {
periphs = periphs[:0]
state = "scanning"
page = scanpage
b.Scan()
}
}
case ble.DiscoverPeripheralEvent:
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fmt.Printf("found %s (%s)\n", e.Peripheral.Name, e.Peripheral.Identifier)
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periphs = append(periphs, e.Peripheral)
btns = append(btns, &widget.Clickable{})
if e.Peripheral.Identifier == Config.Autoconnect && b.Connect(e.Peripheral) {
state = "connecting"
page = connpage
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}
case ble.ConnectEvent:
fmt.Printf("Connect event\n")
b.StopScan()
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state = "connected"
periph = e.Peripheral
Config.Autoconnect = periph.Identifier
saveConfig()
e.Peripheral.DiscoverServices()
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page = hrpage
case ble.ConnectTimeoutEvent:
fmt.Printf("Connect timeout\n")
state = "timeout"
periphs = periphs[:0]
page = scanpage
Config.Autoconnect = ""
saveConfig()
b.Scan()
case ble.DiscoverServiceEvent:
fmt.Printf("DiscoverService %s\n", e.Gatt.UUID)
//if e.Gatt.UUID == "180D" {
if e.Gatt.IsHRM() {
fmt.Printf("Found HRM Service\n")
e.Peripheral.DiscoverCharacteristics(e.Service)
}
case ble.DiscoverCharacteristicEvent:
fmt.Printf("DiscoverCharacteristic %s\n", e.Gatt.UUID)
//if e.Gatt.UUID == "2A37" {
if e.Gatt.IsHRV() {
fmt.Printf("Found heart rate value\n")
e.Peripheral.SetNotifyValue(e.Characteristic)
}
case ble.UpdateValueEvent:
hr = hrDecode(e.Data)
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}
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w.Invalidate() // refresh on any Bluetooth event
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case e := <-w.Events():
switch e := e.(type) {
case system.DestroyEvent:
os.Exit(0)
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case system.FrameEvent:
gtx := layout.NewContext(&ops, e)
if e.Size.X > e.Size.Y {
wide = true
} else {
wide = false
}
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resetSysinset(e.Insets)
sysinset.Layout(gtx, func(gtx C) D {
return margin.Layout(gtx, page)
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})
e.Frame(gtx.Ops)
default:
handleEvent(e, b)
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}
}
}
}