firmware/variants/heltec_wireless_paper/platformio.ini

; Using the original screen class
[env:heltec-wireless-paper]
extends = esp32s3_base
board = heltec_wifi_lora_32_V3
board_build.partitions = default_8MB.csv
build_flags = 
  ${esp32s3_base.build_flags} 
  -I variants/heltec_wireless_paper
  -D HELTEC_WIRELESS_PAPER 
  -D EINK_DISPLAY_MODEL=GxEPD2_213_FC1
  -D EINK_WIDTH=250
  -D EINK_HEIGHT=122
  -D USE_EINK
  -D USE_EINK_DYNAMICDISPLAY            ; Enable Dynamic EInk
  -D EINK_LIMIT_FASTREFRESH=10          ; How many consecutive fast-refreshes are permitted
  -D EINK_BACKGROUND_USES_FAST          ; (Optional) Use FAST refresh for both BACKGROUND and RESPONSIVE, until a limit is reached.
  -D EINK_HASQUIRK_GHOSTING             ; Display model is identified as "prone to ghosting"
lib_deps =
  ${esp32s3_base.lib_deps}
  https://github.com/meshtastic/GxEPD2#b202ebfec6a4821e098cf7a625ba0f6f2400292d
  lewisxhe/PCF8563_Library@^1.0.1
upload_speed = 115200

[env:heltec-wireless-paper-inkhud]
extends = esp32s3_base, inkhud
board = heltec_wifi_lora_32_V3
board_build.partitions = default_8MB.csv
build_src_filter =
  ${esp32_base.build_src_filter} 
  ${inkhud.build_src_filter}
build_flags =
  ${esp32s3_base.build_flags}
  ${inkhud.build_flags}
  -I variants/heltec_wireless_paper
  -D HELTEC_WIRELESS_PAPER
  -D MAX_THREADS=40 ; Required if used with WiFi
lib_deps =
  ${inkhud.lib_deps} ; InkHUD libs first, so we get GFXRoot instead of AdafruitGFX
  ${esp32s3_base.lib_deps}
upload_speed = 921600