From 6df4535ed515a9cfb6875676a9aed72e122c28a4 Mon Sep 17 00:00:00 2001
From: stevenhowes <38082088+stevenhowes@users.noreply.github.com>
Date: Tue, 8 Mar 2022 20:17:16 +0000
Subject: [PATCH] Working code

---
 README.md |  8 +++++++-
 go.mod    |  3 +++
 main.go   | 44 ++++++++++++++++++++++++++++++++++++++++++++
 makefile  | 20 ++++++++++++++++++++
 4 files changed, 74 insertions(+), 1 deletion(-)
 create mode 100644 go.mod
 create mode 100644 main.go
 create mode 100644 makefile

diff --git a/README.md b/README.md
index 7f0dff9..ae0067d 100644
--- a/README.md
+++ b/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
\ No newline at end of file
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..d8dcc81
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module github.com/stevenhowes/TinyGo-Pico-PWM
+
+go 1.17
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..9c6c395
--- /dev/null
+++ b/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)
+	}
+}
diff --git a/makefile b/makefile
new file mode 100644
index 0000000..43f6a52
--- /dev/null
+++ b/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
+