MMDVM
MMDVM Blog @ http://mmdvm.blogspot.co.uk/
As quoted on github …
MMDVM Board
The MMDVM is intended to be an open-source Multi-Mode Digital Voice Modem,
which utilities the power of an ARM processor and a simple analogue interface
board. The Multi-Mode Digital Voice Modem is a combined hardware and software
development of a modem to handle all amateur digital voice modes. Initially
it will support D-Star and DMR, with System Fusion and P.25 coming later, as
well as a built-in FM repeater controller. For all modes other than DMR and
FM, the modem can be used in simplex or duplex mode, while for DMR and FM
full duplex must be used.
MMDVM Board (old version shown)
fitted to an Arduino Due
The MMDVM is aimed at the Arduino Due, Teensy 3.1/3.2 and mbed platforms, the
only requirement for the hardware is to be ARM Cortex-M3, M4, or M7 based,
and access to raw interrupts and ADC and ADC ports as well as digital
signalling ports.
For this reason the Raspberry Pi and similar single board computers are not
being targeted as access to the raw I/O is mediated by the operating system
kernel and does not provide the performance, nor does the hardware provide
the necessary direct access to the I/O pins on the ARM processor. However
such boards are very useful for hosting the interface of the modem to
external networks such as ircDDB in the case of D-Star.
[ 此帖被BG4TGO在2017-05-12 12:41重新编辑 ]
