Using a USBTinyISP to update the QRP Labs QCX transceiver's firmware.

• USBTinyISP with 6 pin cable.
• A built and working QCX tranceiver. Website: http://qrp-labs.com/qcx.html
• QCX Firmware https://www.qrp-labs.com/qcx/qcxfirmware.html.
• Connect a dummy load.

• Add the following line into file: /etc/udev/rules.d/99-USBtiny

  SUBSYSTEM=="usb", ATTR{idVendor}=="1781", ATTR{idProduct}=="0c9f", GROUP="plugdev", MODE="0660"

• Plug in the USBTinyISP (or reconnect).
• Test the connection without connecting to the QCX yet:

  avrdude -c usbtiny -p atmega328p
  
  
  avrdude: initialization failed, rc=-1
           Double check connections and try again, or use -F to override
           this check.
  
  
  avrdude done.  Thank you.

• Connect the transceiver using the pinout below:

  pinout USBTinyISP
  +------------+
  |  miso  vcc |
   ] sck   mosi|
  |  rst   gnd |
  +------------+
  
  pinout QCX
  (left board edge)
        | V -
        | V +
        |
    GND | o o RESET
   MOSI | o o SCK
     5V | o o MISO
  

• Test connection:

  sudo avrdude -p atmega328p -c usbtiny -p atmega328p
  
  avrdude: AVR device initialized and ready to accept instructions
  
  Reading | ################################################## | 100% 0.00s
  
  avrdude: Device signature = 0x1e950f (probably m328p)
  
  avrdude: safemode: Fuses OK (E:FC, H:D1, L:D7)
  
  avrdude done.  Thank you.

• Program latest firmware:

  sudo avrdude -p atmega328p -c usbtiny -U flash:w:T1.07.hex
  
  avrdude: AVR device initialized and ready to accept instructions
  
  Reading | ################################################## | 100% 0.00s
  
  avrdude: Device signature = 0x1e950f (probably m328p)
  avrdude: NOTE: "flash" memory has been specified, an erase cycle will be performed
           To disable this feature, specify the -D option.
  avrdude: erasing chip
  avrdude: reading input file "T1.07.hex"
  avrdude: input file T1.07.hex auto detected as Intel Hex
  avrdude: writing flash (32760 bytes):
  
  Writing | ################################################## | 100% 39.15s
  
  avrdude: 32760 bytes of flash written
  avrdude: verifying flash memory against T1.07.hex:
  avrdude: load data flash data from input file T1.07.hex:
  avrdude: input file T1.07.hex auto detected as Intel Hex
  avrdude: input file T1.07.hex contains 32760 bytes
  avrdude: reading on-chip flash data:
  
  Reading | ################################################## | 100% 29.58s
  
  avrdude: verifying ...
  avrdude: 32760 bytes of flash verified
  
  avrdude: safemode: Fuses OK (E:FC, H:D1, L:D7)
  
  avrdude done.  Thank you.