From 250c47a8e6dc1de1839f9717ec160ea7ec161105 Mon Sep 17 00:00:00 2001
From: Sam Anthony <sam@samanthony.xyz>
Date: Fri, 7 Nov 2025 16:10:37 -0500
Subject: cal: parse dbc file

---
 sw/cal/main.go | 95 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 sw/cal/main.go

(limited to 'sw/cal/main.go')

diff --git a/sw/cal/main.go b/sw/cal/main.go
new file mode 100644
index 0000000..98e021c
--- /dev/null
+++ b/sw/cal/main.go
@@ -0,0 +1,95 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+
+	"go.einride.tech/can/pkg/dbc"
+)
+
+const dev = "can0"
+
+type Signals struct {
+	tach, speed, an1, an2, an3, an4 *dbc.SignalDef
+}
+
+// Flags
+var (
+	// DBC file
+	dbcFilenameFlag = "dbc"
+	dbcFilename = flag.String(dbcFilenameFlag, "", "DBC file name")
+
+	// Signal names
+	tachSigFlag = "tachSig"
+	speedSigFlag = "speedSig"
+	an1SigFlag = "an1Sig"
+	an2SigFlag = "an2Sig"
+	an3SigFlag = "an3Sig"
+	an4SigFlag = "an4Sig"
+	tachSig = flag.String(tachSigFlag, "", "tachometer signal name")
+	speedSig = flag.String(speedSigFlag, "", "speedometer signal name")
+	an1Sig = flag.String(an1SigFlag, "", "analog channel 1 signal name")
+	an2Sig = flag.String(an2SigFlag, "", "analog channel 2 signal name")
+	an3Sig = flag.String(an3SigFlag, "", "analog channel 3 signal name")
+	an4Sig = flag.String(an4SigFlag, "", "analog channel 4 signal name")
+
+	// Calibration tables
+	// TODO
+)
+
+func main() {
+	// Parse command line args
+	flag.Parse()
+	if *dbcFilename == "" {
+		weprintf("Missing '%s' flag.\n", dbcFilenameFlag)
+		flag.Usage()
+		os.Exit(1)
+	}
+
+	// Parse DBC file
+	msgDefs, err := parseDbcFile(*dbcFilename)
+	if err != nil {
+		eprintf("Error parsing %s: %v\n", *dbcFilename, err)
+	}
+
+
+	for _, msg := range msgDefs {
+		for _, sig := range msg.Signals {
+			fmt.Println(sig)
+		}
+	}
+}
+
+func parseDbcFile(filename string) ([]*dbc.MessageDef, error) {
+	// Read file
+	buf, err := os.ReadFile(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	// Parse file
+	parser := dbc.NewParser(filename, buf)
+	if err := parser.Parse(); err != nil {
+		return nil, err
+	}
+
+	// Filter message definitions
+	defs := parser.Defs()
+	msgDefs := make([]*dbc.MessageDef, 0, len(defs))
+	for _, def := range defs {
+		if msg, ok := def.(*dbc.MessageDef); ok {
+			msgDefs = append(msgDefs, msg)
+		}
+	}
+	return msgDefs, nil
+}
+
+func eprintf(format string, a ...any) {
+	weprintf(format, a...)
+	os.Exit(1)
+}
+
+func weprintf(format string, a ...any) {
+	fmt.Fprintf(os.Stderr, format, a...)
+}
-- 
cgit v1.2.3