platformio.ini

; PlatformIO Project Configuration File
;
;   Build options: build flags, source filter
;   Upload options: custom upload port, speed and extra flags
;   Library options: dependencies, extra library storages
;   Advanced options: extra scripting
;
; Please visit documentation for the other options and examples
; https://docs.platformio.org/page/projectconf.html

[env:ATmega328P]
platform = atmelavr
board = ATmega328P
framework = arduino

board_build.f_cpu = 20000000L
build_unflags = -Os
build_flags = -O2

; for potential future use with serial debugging:
; lib_deps = https://github.com/nickgammon/SendOnlySoftwareSerial.git

upload_protocol = custom
upload_port = COM5              ; Windows
; upload_port = /dev/ttyACM0    ; Linux
; upload_port = /dev/cu.usbmodem141101 ; MacOS (Changes with port used)
upload_speed = 19200
upload_flags =
    -C
    ; use "tool-avrdude-megaavr" for the atmelmegaavr platform
    $PROJECT_PACKAGES_DIR/tool-avrdude/avrdude.conf
    -p
    $BOARD_MCU
    -P
    $UPLOAD_PORT
    -b
    $UPLOAD_SPEED
    -c
    stk500v1    ; Arduino UNO as ISP (ATmega328pu)
upload_command = avrdude $UPLOAD_FLAGS -U flash:w:$SOURCE:i

; fuse bit settings
; ATmega328p 20MHz external
board_fuses.lfuse = 0xE0
board_fuses.hfuse = 0xD9
board_fuses.efuse = 0XFF