Differences

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--- communication:protocol [2013/02/01 17:41] – [Communications Protocol] mbrejza
+++ communication:protocol [2015/04/03 09:49] (current) – removed eroneous , at the end of the example mfa298
@@ Line 3: / Line 3: @@
 This is the typical protocol used by UKHAS members to transmit GPS data balloon to ground on the unlicensed bands. Parsing is handled by [[http://habitat.habhub.org/|habitat]] which can be configured to almost practically any format you can come up with, provided the string starts with $$CALLSIGN, end with a newline ('\n'), and contains printable ASCII characters. Fields are comma delimited.
- <code> $$CALLSIGN,sentence_id,time,latitude,longitude,altitude,optional speed,optional bearing,optional internal temperature,*CHECKSUM\n </code>
+ <code> $$CALLSIGN,sentence_id,time,latitude,longitude,altitude,optional speed,optional bearing,optional internal temperature*CHECKSUM\n </code>
   * The individual fields can be of variable length, the minimum and maximum can be set in the payloads XML file.
@@ Line 77: / Line 77: @@
 **Useful code to calculate CRC16_CCITT checksum on the AVR**
+(Refer to [[http://www.nongnu.org/avr-libc/user-manual/group__util__crc.html#gaca726c22a1900f9bad52594c8846115f | this page]] for implementation on other microcontrollers)
 <code c>#include <stdio.h>
@@ Line 100: / Line 102: @@
 	return crc;
 }</code>
 ====== Getting Your Payload On the Tracker ======
 You will need to fill out a flight document so the server can parse your telemetry strings and update the map.\\
 Fill out the form here :[[http://habhub.org/genpayload/|Payload Document Generator]] the come and see us on [[ukhas:irc_channel|IRC]] to get it added.