From 2acfa12f0d3f47810bdfda83b6eef12a63e71703 Mon Sep 17 00:00:00 2001
From: gitknilch <gitknilch@cwde.de>
Date: Tue, 29 Mar 2011 14:35:10 +0200
Subject: [PATCH] move fixcrc to patcheeprom, add patching of node id (pretty
 ugly)

---
 firmware/tools/.gitignore                  |  2 +-
 firmware/tools/Makefile                    |  4 +++-
 firmware/tools/{fixcrc.c => patcheeprom.c} | 26 ++++++++++++++++++++--
 3 files changed, 28 insertions(+), 4 deletions(-)
 rename firmware/tools/{fixcrc.c => patcheeprom.c} (57%)

diff --git a/firmware/tools/.gitignore b/firmware/tools/.gitignore
index 188dff2..7d6ddd9 100644
--- a/firmware/tools/.gitignore
+++ b/firmware/tools/.gitignore
@@ -1 +1 @@
-fixcrc
+patcheeprom
diff --git a/firmware/tools/Makefile b/firmware/tools/Makefile
index fd23463..a2a632f 100644
--- a/firmware/tools/Makefile
+++ b/firmware/tools/Makefile
@@ -1,2 +1,4 @@
-all: fixcrc
+CFLAGS ?= -Wall -O3
+
+all: patcheeprom
 
diff --git a/firmware/tools/fixcrc.c b/firmware/tools/patcheeprom.c
similarity index 57%
rename from firmware/tools/fixcrc.c
rename to firmware/tools/patcheeprom.c
index 3d7fefb..98e5eff 100644
--- a/firmware/tools/fixcrc.c
+++ b/firmware/tools/patcheeprom.c
@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <stdlib.h>
 #include <inttypes.h>
 
 /* EEPROM data size, not including checksum */
@@ -23,11 +24,31 @@ uint16_t crc16_update(uint16_t crc, uint8_t a)
     return crc;
 }
 
+/* oh, this is soooo ugly... :-( */
 int main(int argc, char ** argv)
 {
-    int i, c;
+    int i, c, id;
     uint16_t checksum = 0;
-    for (i = 0; i < EEP_DATA_SIZE; i++) {
+
+    if ((argc < 2) || ((id = atoi(argv[1])) > 15) || (id <= 0))
+    {
+        fputs("usage: patcheeprom id < eeprom-template > eeprom-binary\n\n", stderr);
+        return 127;
+    }
+    /* print out magic byte and add it to checksum */
+    putchar(0x23);
+    checksum = crc16_update(checksum, 0x23);
+
+    /* print out id and add it to checksum */
+    putchar(id);
+    checksum = crc16_update(checksum, id);
+
+    /* ignore first two bytes of input */
+    getchar();
+    getchar();
+
+    /* now copy template and adapt checksum */
+    for (i = 2; i < EEP_DATA_SIZE; i++) {
 
         if ((c = getchar()) == EOF) {
             return 1;
@@ -39,6 +60,7 @@ int main(int argc, char ** argv)
             return 2;
         }
     }
+    /* print out checksum, and we're done */
     putchar(checksum & 0xff);
     putchar(checksum >> 8);
 
-- 
2.39.2