Working code

README.md

@@ -1,2 +1,8 @@
 # TinyGo-Pico-PWM
-A working example of PWM for the Pi Pico using TinyGo
+A working example of PWM for the Pi Pico using TinyGo.
+
+I was frustraded by various examples (includig the official docs) being wrong for the Pico so I decided to make my own. It flashes the onboard LED in a 'breathe' pattern.
+
+Makefile included, so you can 'make install', alternatively:
+
+tinygo flash -target=pico

go.mod

@@ -0,0 +1,3 @@
+module github.com/stevenhowes/TinyGo-Pico-PWM
+
+go 1.17

main.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"machine"
+	"time"
+)
+
+func main() {
+	// 500Hz
+	var period uint64 = 1e9 / 500
+
+	pin := machine.LED
+	pwm := machine.PWM4
+
+	pin.Configure(machine.PinConfig{Mode: machine.PinPWM})
+
+	err := pwm.Configure(machine.PWMConfig{Period: period})
+	if err != nil {
+		println(err.Error())
+	}
+	ch, err := pwm.Channel(pin)
+	if err != nil {
+		println(err.Error())
+	}
+
+	pwm.SetTop(uint32(255))
+
+	for {
+		// Fade in
+		for i := 0; i <= 255; i++ {
+			pwm.Set(ch, uint32(i))
+			time.Sleep(time.Millisecond * 10)
+		}
+
+		// Fade out
+		for i := 255; i >= 0; i-- {
+			pwm.Set(ch, uint32(i))
+			time.Sleep(time.Millisecond * 10)
+		}
+
+		// Wait one second
+		time.Sleep(time.Millisecond * 1000)
+	}
+}

makefile

@@ -0,0 +1,20 @@
+.DEFAULT_GOAL := install
+
+fmt:
+	go mod tidy
+	go fmt ./...
+.PHONY:fmt
+
+lint: fmt
+	golint ./...
+.PHONY:lint
+
+vet: fmt
+# Need to work this out for tinygo..
+#	go vet ./...
+.PHONY:vet
+
+install: vet
+	tinygo flash -target=pico
+.PHONY:install
+