From 9d2eb0b00a5a0faefce95bce949be7206b0aad37 Mon Sep 17 00:00:00 2001
From: Keith Packard <keithp@keithp.com>
Date: Tue, 12 Nov 2013 14:48:21 +0900
Subject: [PATCH] Add ublox checksum generating program

---
 src/drivers/ublox-csum.5c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 src/drivers/ublox-csum.5c

diff --git a/src/drivers/ublox-csum.5c b/src/drivers/ublox-csum.5c
new file mode 100644
index 00000000..4e0c7c5a
--- /dev/null
+++ b/src/drivers/ublox-csum.5c
@@ -0,0 +1,23 @@
+#!/usr/bin/nickle
+string[] speeds = { "57600", "19200", "9600" };
+
+string make_set_nmea(string speed) {
+	return sprintf ("PUBX,41,1,3,1,%s,0", speed);
+}
+
+int csum(string x) {
+	int csum = 0;
+	for (int i = 0; i < String::length(x); i++)
+		csum ^= x[i];
+	return csum;
+}
+
+for (int i = 0; i < dim(speeds); i++) {
+	string s = make_set_nmea(speeds[i]);
+	int c = csum(s);
+	printf ("/* $%s* */\n", s);
+	printf ("#define SERIAL_SPEED_STRING   \"%s\"\n", speeds[i]);
+	printf ("#define SERIAL_SPEED_CHECKSUM \"%02x\"\n", c);
+}
+	
+	
-- 
2.30.2