From c9dc844d840957721607059808c040abc8d3cc01 Mon Sep 17 00:00:00 2001
From: Drew Bowering <db@d-b.ca>
Date: Sat, 30 Mar 2024 13:53:19 -0600
Subject: [PATCH] initial implementation - Single "inside" light, with inside
 brightness button. Cycles through the brightness settings, white light only.

---
 .vscode/settings.json |   8 ++
 main.go               | 179 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 187 insertions(+)
 create mode 100644 .vscode/settings.json
 create mode 100644 main.go

diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..1b4896c
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,8 @@
+{
+    "go.toolsEnvVars": {
+        "GOOS": "linux",
+        "GOARCH": "arm",
+        "GOROOT": "/home/drew/.cache/tinygo/goroot-9c236da82c2ce16303d51dc7635261f33d2c6bc8180628c7b6806ae789ca6c8b",
+        "GOFLAGS": "-tags=cortexm,baremetal,linux,arm,rp2040,rp,pico,tinygo,purego,math_big_pure_go,gc.conservative,scheduler.tasks,serial.usb"
+    }
+}
\ No newline at end of file
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..ca91bf9
--- /dev/null
+++ b/main.go
@@ -0,0 +1,179 @@
+package main
+
+import (
+	"machine"
+	"time"
+)
+
+type pwm interface {
+	Top() uint32
+	Set(uint8, uint32)
+	Channel(machine.Pin) (uint8, error)
+}
+
+type lighthardware struct {
+	rPin machine.Pin
+	gPin machine.Pin
+	bPin machine.Pin
+	rPwm pwm
+	gPwm pwm
+	bPwm pwm
+	rCh  uint8
+	gCh  uint8
+	bCh  uint8
+}
+
+func (lhw *lighthardware) InitPWM() error {
+	var err error
+
+	lhw.rCh, err = lhw.rPwm.Channel(lhw.rPin)
+	if err != nil {
+		return err
+	}
+
+	lhw.gCh, err = lhw.gPwm.Channel(lhw.gPin)
+	if err != nil {
+		return err
+	}
+
+	lhw.bCh, err = lhw.bPwm.Channel(lhw.bPin)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+const (
+	period         = uint64(1e9 / 500)
+	pressdelay     = time.Millisecond * 500
+	brightnesspeak = uint32(255)
+)
+
+func main() {
+	errs := make(chan error)
+
+	outsidepushed := make(chan bool)
+	insidepushed := make(chan bool)
+	partypushed := make(chan bool)
+
+	outsidebrightness := make(chan uint32, 2)
+	insidebrightness := make(chan uint32, 2)
+
+	outsidebutton := machine.GP22
+	insidebutton := machine.GP21
+	partybutton := machine.GP20
+
+	outsidebutton.Configure(machine.PinConfig{Mode: machine.PinInputPullup})
+	insidebutton.Configure(machine.PinConfig{Mode: machine.PinInputPullup})
+	partybutton.Configure(machine.PinConfig{Mode: machine.PinInputPullup})
+
+	outsidebutton.SetInterrupt(machine.PinFalling, func(p machine.Pin) {
+		select {
+		case outsidepushed <- true:
+		default:
+		}
+	})
+	insidebutton.SetInterrupt(machine.PinFalling, func(p machine.Pin) {
+		select {
+		case insidepushed <- true:
+		default:
+		}
+	})
+	partybutton.SetInterrupt(machine.PinFalling, func(p machine.Pin) {
+		select {
+		case partypushed <- true:
+		default:
+		}
+	})
+
+	pwm1 := machine.PWM5
+	pwm1.Configure(machine.PWMConfig{
+		Period: period,
+	})
+	pwm2 := machine.PWM6
+	pwm2.Configure(machine.PWMConfig{
+		Period: period,
+	})
+
+	insideLight := lighthardware{
+		rPin: machine.GP11,
+		gPin: machine.GP13,
+		bPin: machine.GP12,
+		rPwm: pwm1,
+		gPwm: pwm2,
+		bPwm: pwm2,
+	}
+	err := insideLight.InitPWM()
+
+	if err != nil {
+		errs <- err
+	} else {
+		go cycleBrightness(insidepushed, insidebrightness)
+		go cycleBrightness(outsidepushed, outsidebrightness)
+		go loop(&insideLight, nil, insidebrightness, outsidebrightness)
+	}
+
+	println((<-errs).Error())
+}
+
+func cycleBrightness(pushchan chan bool, brightnesschan chan uint32) {
+	brightnesschan <- 0
+	for {
+		<-pushchan
+		brightnesschan <- 255
+		time.Sleep(pressdelay)
+		<-pushchan
+		brightnesschan <- 120
+		time.Sleep(pressdelay)
+		<-pushchan
+		brightnesschan <- 30
+		time.Sleep(pressdelay)
+		<-pushchan
+		brightnesschan <- 0
+		time.Sleep(pressdelay)
+	}
+}
+
+func ledset(lpwm pwm, ledch uint8, brightness uint32) {
+	lpwm.Set(ledch, (lpwm.Top()/brightnesspeak)*brightness)
+}
+
+func loop(inside *lighthardware, outside *lighthardware, insidebrightness chan uint32, outsidebrightness chan uint32) {
+	var brightIn uint32
+	var brightOut uint32
+	inBrightChange := make(chan bool)
+	outBrightChange := make(chan bool)
+
+	go func() {
+		for {
+			brightIn = <-insidebrightness
+			select {
+			case inBrightChange <- true:
+			default:
+			}
+		}
+	}()
+	go func() {
+		for {
+			brightOut = <-outsidebrightness
+			select {
+			case outBrightChange <- true:
+			default:
+			}
+		}
+	}()
+
+	for {
+		select {
+		case <-inBrightChange:
+			ledset(inside.rPwm, inside.rCh, brightIn)
+			ledset(inside.gPwm, inside.gCh, brightIn)
+			ledset(inside.bPwm, inside.bCh, brightIn)
+		case <-outBrightChange:
+			ledset(outside.rPwm, outside.rCh, brightOut)
+			ledset(outside.gPwm, outside.gCh, brightOut)
+			ledset(outside.bPwm, outside.bCh, brightOut)
+		}
+	}
+}