Add EEPROM image generator.

cmd/eig/main.go

@@ -0,0 +1,52 @@
+package main
+
+import (
+	"flag"
+	"os"
+
+	"git.sr.ht/~kisom/goutils/die"
+)
+
+// size of a kilobit in bytes
+const kilobit = 128
+const pageSize = 4096
+
+func main() {
+	size := flag.Int("s", 256*kilobit, "size of EEPROM image in kilobits")
+	fill := flag.Uint("f", 0, "byte to fill image with")
+	flag.Parse()
+
+	if *fill > 256 {
+		die.With("`fill` argument must be a byte value")
+	}
+
+	path := "eeprom.img"
+
+	if flag.NArg() > 0 {
+		path = flag.Arg(0)
+	}
+
+	fillByte := uint8(*fill)
+
+	buf := make([]byte, pageSize)
+	for i := 0; i < pageSize; i++ {
+		buf[i] = fillByte
+	}
+
+	pages := *size / pageSize
+	last := *size % pageSize
+
+	file, err := os.Create(path)
+	die.If(err)
+	defer file.Close()
+
+	for i := 0; i < pages; i++ {
+		_, err = file.Write(buf)
+		die.If(err)
+	}
+
+	if last != 0 {
+		_, err = file.Write(buf[:last])
+		die.If(err)
+	}
+}