initial commit

.gitignore

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+.DS_Store
+.vscode
+
+coverage.out
+radiogagad

.travis.yml

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+language: go
+
+go:
+- 1.12.x

LICENSE

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+MIT License
+
+Copyright (c) 2019 VinyMeuh
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

Makefile

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+BINARY=radiogagad
+
+SHELL := $(shell which bash)
+ENV = /usr/bin/env
+
+.SHELLFLAGS = -c
+
+.ONESHELL: ;
+.NOTPARALLEL: ;
+.EXPORT_ALL_VARIABLES:
+
+.PHONY: all
+.DEFAULT_GOAL := help
+
+VERSION = `git describe --tags --always`
+BUILD   = `date +%FT%T%z`
+
+LDFLAGS = -ldflags "-w -s -X main.Version=${VERSION} -X main.Build=${BUILD}"
+
+
+build: ## Build for current host
+	go build ${LDFLAGS} -o ${BINARY}
+
+buildarm6: ## Build for Pi Zero
+	GOOS=linux GOARCH=arm GOARM=6 go build ${LDFLAGS} -o ${BINARY}
+
+buildarm7: ## Build for Pi 3
+	GOOS=linux GOARCH=arm GOARM=7 go build ${LDFLAGS} -o ${BINARY}
+
+clean: ## Delete binary
+	rm -f ${BINARY}
+
+coverage: ## Show test coverage
+	go tool cover -func=coverage.out
+	go tool cover -html=coverage.out
+
+help: ## Show Help
+	@grep -E '^[a-zA-Z0-9_-]+:.*?## .*$$' $(MAKEFILE_LIST) | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-20s\033[0m %s\n", $$1, $$2}'
+
+test: ## Run tests
+	go test -coverprofile=coverage.out ./...

README.md

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+# radiogagad - the daemon inside my RaspDAC
+
+[![Build Status](https://travis-ci.org/vinymeuh/radiogagad.svg?branch=master)](https://travis-ci.org/vinymeuh/radiogagad)
+[![Go Report Card](https://goreportcard.com/badge/github.com/vinymeuh/radiogagad)](https://goreportcard.com/report/github.com/vinymeuh/radiogagad)
+
+## Build and install
+
+First you need a [Go](https://golang.org/dl/) distribution. Then on the build host, targeting a Raspberry Pi 3
+
+```
+make buildarm7
+```
+
+Install by simply copy the binary under ```/usr/local/bin``` and setup the service for the service manager used by the distribution
+
+* For systemd: [radiogagad.service](https://github.com/vinymeuh/radiogagad/blob/master/radiogagad.service)
+
+## Configuration
+
+Some points are configurables using environment variables
+
+| Variable | Usage | Defaults |
+| -------- | ----- | -------- |
+| RGGD_MPD_SERVER | mpd server and port to connect to | localhost:6600 |
+| RGGD_STARTUP_PLAYLISTS | comma separated list of playlists to be tried to load and play at start-up |  |
+
+## Inspirations, links and references
+
+### RaspDAC pinout
+
+![RaspDAC pinout](https://github.com/vinymeuh/radiogagad/blob/master/public/I-SABRE-V3_FR_1_1.jpg)
+
+### Power Button
+
+* [Example implementations from Audiophonics](https://github.com/audiophonics/Raspberry-pwr-management)
+
+### MPD
+
+* [MPD Protocol Specification](https://www.musicpd.org/doc/html/protocol.html)
+
+### Winstar OLED WEH001602A
+
+* [HD44780U Hitachi Datasheet](https://www.sparkfun.com/datasheets/LCD/HD44780.pdf)
+* [Winstar_GraphicOLED.py](https://github.com/dhrone/Raspdac-Display/blob/master/Winstar_GraphicOLED.py)
+* Wikipedia article for [Hitachi HD44780 LCD controller](https://en.wikipedia.org/wiki/Hitachi_HD44780_LCD_controller)
+* [Adafruit_CharacterOLED](https://github.com/ladyada/Adafruit_CharacterOLED)
+* [Interfacing 16x2 LCD with Raspberry Pi using GPIO & Python](http://www.rpiblog.com/2012/11/interfacing-16x2-lcd-with-raspberry-pi.html)

drivers/winstar/display.go

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+// Copyright 2019 VinyMeuh. All rights reserved.
+// Use of the source code is governed by a MIT-style license that can be found in the LICENSE file.
+
+// This file contains the public API of the driver
+//  - the singleton Display (!!no thread safe!!)
+//  - high level commands to control display and write text
+//
+// Pinout is hard coded for the I-Sabre V3 DAC from Audiophonics
+
+package winstar
+
+import (
+	"fmt"
+	"time"
+
+	"periph.io/x/periph/conn/gpio"
+	"periph.io/x/periph/conn/gpio/gpioreg"
+	"periph.io/x/periph/host"
+)
+
+const (
+	_RS  = "GPIO7"
+	_ES  = "GPIO8"
+	_DB4 = "GPIO25"
+	_DB5 = "GPIO24"
+	_DB6 = "GPIO23"
+	_DB7 = "GPIO27"
+)
+
+// LineNumber is used by WriteAt() to select the line where to write
+type LineNumber int
+
+const (
+	// Line1 to select first line of the display
+	Line1 LineNumber = iota
+	// Line2 to select second line of the display
+	Line2
+)
+
+var display *weh001602a
+
+// Display returns the initialized driver
+func Display() *weh001602a {
+	if display == nil {
+		host.Init()
+		display = &weh001602a{
+			rs: gpioreg.ByName(_RS),
+			es: gpioreg.ByName(_ES),
+			data: [4]gpio.PinIO{
+				gpioreg.ByName(_DB4),
+				gpioreg.ByName(_DB5),
+				gpioreg.ByName(_DB6),
+				gpioreg.ByName(_DB7),
+			},
+		}
+		display.initialize()
+	}
+	return display
+}
+
+/*********************/
+/** Display Control **/
+/*********************/
+
+// Clear display writes space code 20H into all DDRAM addresses.
+// It then sets DDRAM address 0 into the address counter,
+// and returns the display to its original status if it was shifted.
+func (w *weh001602a) Clear() {
+	w.sendCommand(instrClearDisplay)
+	time.Sleep(10 * time.Millisecond)
+}
+
+// DisplayOn turns the display on
+func (w *weh001602a) DisplayOn() {
+	w.instrDisplayControl = w.instrDisplayControl | displayOn
+	fmt.Printf("%-16s %08b (%08b)\n", "DisplayOn", w.instrDisplayControl, displayOn)
+	w.sendCommand(w.instrDisplayControl)
+}
+
+// DisplayOff turns the display off
+func (w *weh001602a) DisplayOff() {
+	w.instrDisplayControl = w.instrDisplayControl & displayOff
+	fmt.Printf("%-16s %08b (%08b)\n", "DisplayOff", w.instrDisplayControl, displayOff)
+	w.sendCommand(w.instrDisplayControl)
+}
+
+/********************/
+/** Cursor Control **/
+/********************/
+
+// Return home sets DDRAM address 0 into the address counter,
+// and returns the display to its original status if it was shifted.
+// The DDRAM contents do not change.
+func (w *weh001602a) Home() {
+	w.sendCommand(instrReturnHome)
+	//time.Sleep(10 * time.Millisecond)
+}
+
+/**********************/
+/** Write Characters **/
+/**********************/
+
+// Send string to LCD at current position of cursor
+func (w *weh001602a) Write(msg string) {
+	for _, char := range msg {
+		if char > 255 {
+			char = 32
+		}
+		w.sendData(uint8(char))
+	}
+}
+
+// Send string to LCD at start of one of the lines
+func (w *weh001602a) WriteAt(line LineNumber, msg string) {
+	switch line {
+	case Line1:
+		w.sendCommand(addrStartLine1)
+	case Line2:
+		w.sendCommand(addrStartLine2)
+	}
+	w.Write(msg)
+}

drivers/winstar/drivertest/.gitignore

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+drivertest

drivers/winstar/drivertest/README.md

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+# radiogagad - test program for the winstar oled driver
+
+Build
+
+```shell
+GOOS=linux GOARCH=arm GOARM=7 go build
+```

drivers/winstar/drivertest/main.go

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+// Copyright 2019 VinyMeuh. All rights reserved.
+// Use of the source code is governed by a MIT-style license that can be found in the LICENSE file.
+
+// Test program for the winstar oled driver
+// Build with: GOOS=linux GOARCH=arm GOARM=7 go build
+
+package main
+
+import (
+	"time"
+
+	"github.com/vinymeuh/radiogagad/drivers/winstar"
+)
+
+func main() {
+	lcd := winstar.Display()
+
+	lcd.Write("All we hear is radio ga ga")
+	lcd.WriteAt(winstar.Line2, "Radio goo goo")
+	time.Sleep(3 * time.Second)
+
+	lcd.DisplayOff()
+	time.Sleep(3 * time.Second)
+
+	lcd.Home()
+	lcd.Clear()
+	lcd.WriteAt(winstar.Line1, "Don't stop me now")
+	lcd.WriteAt(winstar.Line2, "Have a good time, good time")
+	lcd.DisplayOn()
+	time.Sleep(3 * time.Second)
+
+	lcd.DisplayOff()
+}