pi@delta-pi:~/klipper $ sudo service klipper stop
pi@delta-pi:~/klipper $ make clean
pi@delta-pi:~/klipper $ make
  Build Kconfig config file
  Creating symbolic link out/board
  Compiling out/src/sched.o
  Compiling out/src/command.o
  Compiling out/src/basecmd.o
  Compiling out/src/debugcmds.o
  Compiling out/src/initial_pins.o
  Compiling out/src/gpiocmds.o
  Compiling out/src/stepper.o
  Compiling out/src/endstop.o
  Compiling out/src/adccmds.o
  Compiling out/src/spicmds.o
  Compiling out/src/thermocouple.o
  Compiling out/src/i2ccmds.o
  Compiling out/src/pwmcmds.o
  Compiling out/src/lcd_st7920.o
  Compiling out/src/lcd_hd44780.o
  Compiling out/src/buttons.o
  Compiling out/src/tmcuart.o
  Compiling out/src/spi_software.o
  Compiling out/src/avr/main.o
  Compiling out/src/avr/timer.o
  Compiling out/src/avr/gpio.o
  Compiling out/src/avr/adc.o
  Compiling out/src/avr/spi.o
  Compiling out/src/avr/i2c.o
  Compiling out/src/avr/hard_pwm.o
  Compiling out/src/avr/watchdog.o
  Compiling out/src/avr/serial.o
  Compiling out/src/generic/serial_irq.o
  Building out/compile_time_request.o
Version: v0.7.0-445-g2d86448-20190421_014607-delta-pi
  Linking out/klipper.elf
  Creating hex file out/klipper.elf.hex
pi@delta-pi:~/klipper $ ls -l /dev/serial/by-id/*
lrwxrwxrwx 1 root root 13 Apr 21 01:45 /dev/serial/by-id/usb-FTDI_FT232R_USB_UART_AC01SK7I-if00-port0 -> ../../ttyUSB0
pi@delta-pi:~/klipper $ ^C
pi@delta-pi:~/klipper $ make flash FLASH_DEVICE=/dev/serial/by-id/usb-FTDI_FT232R_USB_UART_AC01SK7I-if00-port0
  Flashing out/klipper.elf.hex to /dev/serial/by-id/usb-FTDI_FT232R_USB_UART_AC01SK7I-if00-port0 via avrdude
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
^Csrc/avr/Makefile:32: recipe for target 'flash' failed
make: *** [flash] Interrupt

pi@delta-pi:~/klipper $