From: Keith Packard <keithp@keithp.com>
Date: Tue, 12 Nov 2013 05:48:21 +0000 (+0900)
Subject: Add ublox checksum generating program
X-Git-Tag: 1.2.9.4~12
X-Git-Url: https://git.gag.com/?p=fw%2Faltos;a=commitdiff_plain;h=9d2eb0b00a5a0faefce95bce949be7206b0aad37

Add ublox checksum generating program
---

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);
+}
+	
+