RS41HUP (Ham Use Project) - Project Horus Fork

Firmware for RS41 for HAM use.

IMPORTANT - I no longer maintain this repository. Please use RS41ng or RS41HUP_V2 instead. I will also no longer be assigning Horus Binary v1 Payload IDs, please use the Horus Binary v2 mode instead.

It is possible to recycle RS41-SGP sondes for amateur radio use without any electrical changes! You just have to build a new firmware (this one) and apply it via a cheap programmer, the "ST-Linkv2" (or alternatives). The modified sonde can now transmit on a user-defined frequency in the 70cm band, with Habhub-compatible RTTY and (better performing) 4FSK telemetry!

Released under GPL v2.

Check out Mikael's RS41ng repository for a much cleaner and well maintained RS41 firmware that supports the Horus 4FSK mode!

Original Repository: https://github.com/Qyon/STM32_RTTY, though this fork is based on DF8OE's version.

Modifications by Mark Jessop vk5qi@rfhead.net include:

Compatability with existing Project Horus RTTY Formats.
Removed APRS support - no 70cm APRS infrastructure in Australia, so not really useful to us.
Addition of the 4FSK 'Horus Binary' high performance telemetry mode
- A decoder for the 4FSK mode is available here: https://github.com/projecthorus/horusdemodlib
- Information on the 4FSK mode's performance is available here: https://www.rowetel.com/?p=5906

Compilation

Linux / OSX:

Grab the latest GNU ARM Embedded toolchain from here: https://developer.arm.com/open-source/gnu-toolchain/gnu-rm/downloads
Extract the tarball to somewhere useful. In my case I'm using ~/opt/
Within the RS41HUP directory:
- Edit CMakeLists.txt and set the correct path to the un-tar'd directory.
- cmake .
- make

Windows:

(Note, is likely broken - currently targeting Linux / OSX builds)

Use: https://www.wyzbee.com/download/Utilities/Software/CoIDE-1.7.8.exe

And: https://launchpad.net/gcc-arm-embedded/5.0/5-2016-q3-update/+download/gcc-arm-none-eabi-5_4-2016q3-20160926-win32.exe

Programming

Either:

Use the ST Micro ST-LINK utility (windows only it seems?), or
stlink under Linux/OSX (will need to be unlocked first), or
OpenOCD on Linux / RaspberryPi (see openocd_rs41.cfg file for usage) or
Use flash.sh with a Black Magic Probe. You will need to modify the path to the debugger's serial interface.

Refer to this file for programming header pinouts.

Configuration

Configuration settings are located in config.h. Modify as appropriate before compiling/programming.

#Changelog

14.12.2016 - Reverse engineeded connections, initial hard work, resulting in working RTTY by SQ7FJB
07.01.2017 - GPS now using proprietiary UBLOX protocol, more elastic code to set working frequency by SQ5RWU
23.01.2017 - Test APRS code, small fixes in GPS code by SQ5RWU
06.06.2017 - APRS code fix, some code cleanup
June 2017 - starting with Linux support, making configuration more flexible by DF8OE
March 2018 - Addition of 4FSK binary mode support by Mark VK5QI

#TODO

Temperature and moisture sensor support (temperature should be the easiest to get going first...)
Implementing protocol for using external devices on extension header
Configuration via extension header (serial connection) without need for reflashing firmware