MMDVM Firmware - M17 Branch

MMDVMFirmware_M17_Branch

# Update host
sudo apt update
sudo apt upgrade
sudo reboot

# Install prerequisites
sudo apt install gcc-arm-none-eabi \
  binutils-arm-none-eabi \
  libusb-1.0-0 \
  libusb-1.0-0-dev \
  libusb-1.0-0-doc \
  libnewlib-arm-none-eabi \
  git \
  make \
  curl \
  python-pip \
  gcc-arm-none-eabi \
  libstdc++-arm-none-eabi-newlib \
  stm32flash
  
# Clone MMDVM Firmware - M17_AX25_FM Branch
git clone -b M17_AX25_FM https://github.com/g4klx/MMDVM.git
cd MMDVM

# Build Firmware
git submodule init
git submodule update
make -f Makefile dvm

# Flash MMDVM Firmware to STM32 DVM USB
  - put STM32 DVM USB into Bootloader mode by removing the USB cable, bridging JP1, then reattaching the USB cable
    - JP1 can be shorted by soldering header pins in and installing a jumper, or by using something like tweezers or a wire
    - PWR, ACT and DMR should be lit solid, NOT flashing!
      If the LEDs are NOT in this configuration, STOP!!  Re-do the short/power-on procedure described above until they are.

sudo stm32flash v -w bin/mmdvm_f4.hex -R /dev/ttyUSB0

  - Output should be similar to the following:
    
    stm32flash 0.5 
    
    http://stm32flash.sourceforge.net/ 
    
    Interface serial_posix: 57600 8E1 
    Version      : 0x31 
    Option 1     : 0x00 
    Option 2     : 0x00 
    Device ID    : 0x0421 (STM32F446xx) 
    - RAM        : 128KiB  (12288b reserved by bootloader) 
    - Flash      : 512KiB (size first sector: 1x16384) 
    - Option RAM : 16b 
    - System RAM : 30KiB  
    
    Write to memory 
    Erasing memory 
    Wrote and verified address 0x0800fec8 (100.00%) Done.
    
  - The flash process should take a few minutes or so. If not, then you may have flashed the wrong file and should
    start the flash over again.