I have flashed the Optiboot bootloader to an ATTiny85 using the Arduino IDE. Through this IDE I can also upload sketches. Everything works as expected (besides the “tuning of the bootloader”).
Now that I have the bootloader working I wanted to switch to Platformio (via VSCode). However, flashing doesn’t work.
[env:attiny85] platform = atmelavr board = attiny85 board_build.f_cpu = 1000000L ;8MHz framework = arduino upload_protocol = stk500v1 ; each flag in a new line upload_flags = -P$UPLOAD_PORT -b$UPLOAD_SPEED board_bootloader.file = ./bootloader/optiboot_attiny85_8000000L.hex board_bootloader.lfuse = 0xE2 board_bootloader.hfuse = 0xD5 board_bootloader.efuse = 0xFE board_bootloader.lock_bits = 0xFF board_bootloader.unlock_bits = 0xFF board_fuses.lfuse = 0xE2 board_fuses.hfuse = 0xD5 board_fuses.efuse = 0xFE ; edit these lines upload_port = COM3 upload_speed = 19200
Now Pio doesn’t seem to be able to connect to the chip:
avrdude -PCOM3 -b19200 -v -p attiny85 -C path\to\avrdude.conf -c stk500v1 -b 19200 -e -D -U flash:w:.pio\build\attiny85\firmware.hex:i avrdude: Version 6.3, compiled on Sep 12 2016 at 17:24:16 Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/ Copyright (c) 2007-2014 Joerg Wunsch System wide configuration file is "path\to\tool-avrdude\avrdude.conf" Using Port : COM3 Using Programmer : stk500v1 Overriding Baud Rate : 19200 avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x03
FYI: Arduino IDE’s avrdude’s command is
C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avrdude -CPATH\TO\avrdude.conf -v -pattiny85 -carduino -PCOM3 -b19200 -D -Uflash:w:PATH\TO\attiny85.ino.hex:i
Anyone has an idea?