引用ls a20_midi.hex
とコピーペーストでターミナルに入力したところ、
ls: a20_midi.hex: No such file or directory
と出てしまい、
cd ~/Desktop/miniboard_20170928
引用avrdude -c usbasp -p t2313 -U lfuse:w:a20_midi.elf -U hfuse:w:a20_midi.elf -U efuse:w:a20_midi.elf -U flash:w:a20_midi.elf
と入力したところ、
avrdude: warning: cannot set sck period. please check for usbasp firmware update.
avrdude: error: program enable: target doesn't answer. 1
avrdude: initialization failed, rc=-1
Double check connections and try again, or use -F to override
this check.