From 2ef3182af5118bc170f5e42c458e2c2c16288e6c Mon Sep 17 00:00:00 2001
From: Kevin Wallace <kevin@pentabarf.net>
Date: Thu, 5 Mar 2026 20:18:45 -0800
Subject: beep when you press the button

Polls PIC32 ignition button state, tells the cVEND to beep.
---
 Makefile         |  8 ++++----
 autorun.sh       |  5 +++--
 cmd/beep/main.go | 42 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 49 insertions(+), 6 deletions(-)
 create mode 100644 cmd/beep/main.go

diff --git a/Makefile b/Makefile
index 1620c85..07e308d 100644
--- a/Makefile
+++ b/Makefile
@@ -5,8 +5,9 @@ export GOARM=7
 USB_ROOT=/Volumes/MP_SD
 
 GOSOURCES:=$(shell find . -name *.go)
+BINS:=bin/cvend-ipp bin/pic32-ipp bin/beep
 
-all: bin/cvend-ipp bin/pic32-ipp
+all: ${BINS}
 
 clean:
 	rm -r bin
@@ -15,8 +16,7 @@ bin/%: ${GOSOURCES}
 	mkdir -p bin
 	go build -o $@ ./cmd/$*
 
-usb: autorun.sh bin/cvend-ipp bin/pic32-ipp
+usb: autorun.sh ${BINS}
 	install autorun.sh ${USB_ROOT}/
 	install -d ${USB_ROOT}/bin/
-	install bin/cvend-ipp ${USB_ROOT}/bin/
-	install bin/pic32-ipp ${USB_ROOT}/bin/
+	install ${BINS} ${USB_ROOT}/bin/
diff --git a/autorun.sh b/autorun.sh
index c67c48f..4d6697c 100644
--- a/autorun.sh
+++ b/autorun.sh
@@ -1,4 +1,5 @@
 #!/bin/bash -x
 cd "$(dirname "$0")"
-systemd-run -p StandardOutput=tty -d bin/cvend-ipp
-systemd-run -p StandardOutput=tty -d bin/pic32-ipp
+#systemd-run -p StandardOutput=tty -d bin/cvend-ipp
+#systemd-run -p StandardOutput=tty -d bin/pic32-ipp
+systemd-run -p StandardOutput=tty -d bin/beep
diff --git a/cmd/beep/main.go b/cmd/beep/main.go
new file mode 100644
index 0000000..56263d5
--- /dev/null
+++ b/cmd/beep/main.go
@@ -0,0 +1,42 @@
+package main
+
+import (
+	"encoding/binary"
+	"time"
+
+	"pm3.dev/cvend"
+	"pm3.dev/pic32"
+)
+
+func must[V any](v V, err error) V {
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
+func main() {
+	cv := must(cvend.OpenIPP(nil))
+	defer cv.Close()
+	var lastIgnition bool
+	pic := must(pic32.OpenIPP(func(msgType byte, msgData []byte) {
+		if msgType == 0x03 && binary.BigEndian.Uint16(msgData[:2]) == 0x03fb {
+			ignition := msgData[2] != 0
+			if lastIgnition != ignition {
+				lastIgnition = ignition
+				if ignition {
+					if err := cv.SendIPP(0x22, []byte{0x06, 0x00, 0x01, 0x00}); err != nil {
+						panic(err)
+					}
+				}
+			}
+		}
+	}))
+	defer pic.Close()
+	for {
+		if err := pic.SendIPP(0x02, []byte{0x03, 0xfb}); err != nil {
+			panic(err)
+		}
+		time.Sleep(100 * time.Millisecond)
+	}
+}
-- 
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