Firmware for DMR transceivers using the NXP MK22 MCU, AT1846S RF chip and HR-C6000 DMR chipset.
Including the Radioddiy GD-77 and GD-77S, the TYT MD-760 and TYT MD-730, the Baofeng DM-1801, DM-1801A, DM-860, RD-5R and DM-5R Tier2.
The firmware is relatively stable and provides DMR and FM audio transmission and reception, as well as a DMR hotspot mode.
However it does not support some core functionality that the official firmware supports, including sending and receiving of text / SMS messages
The firmware source code does not contain a AMBE codec required for DMR operation.
This functionality is provided by the official firmware which is merged with the OpenGD77 by the firmware loader
See https://github.com/LibreDMR/OpenGD77_UserGuide
Originally conceived by Kai DG4KLU.
Further development by Roger VK3KYY, latterly assisted by Daniel F1RMB, Alex DL4LEX, Colin G4EML and others.
Current lead developer and source code gatekeeper is Roger VK3KYY
The firmware is copyright of the OpenGD77 developers. See individual source files for copyright information.
Copyright (c) 2015, Freescale Semiconductor, Inc.
Copyright 2016-2021 NXP
All rights reserved.
Copyright (C) 2020 Amazon.com, Inc. or its affiliates.
All Rights Reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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Thanks to those who have assisted the project including :
CT1HSN CT4TX DG3GSP DG4KLU DJ0HF DL4LEX EA3BIL EA3IGM EA5SW EB3AM EW1ADG F1CXG F1RMB G4ELM IK0NWG IU4LEG IZ2EIB JE4SMQ JG1UAA OH1E OK2HAD ON1HK ON7LDS OZ1MAX PU4RON SQ6SFO SQ7PTE TA5AYX VK3KYY VK4JWT VK7JS VK7ZCR VK7ZJA ZL1XE