Update platformio.ini

Author: luc-github

platformio.ini

@@ -40,18 +40,22 @@ lib_ignore =
     ESPAsyncTCP
 
 [env:esp32-S2]
+;EXPERIMENTAL AND NOT WORKING FOR ME
+;it seems it cannot write settings to flash and so go dead loop.
+;No official support yet, check https://github.com/platformio/platform-espressif32/issues/619
+;I currently use arduino IDE to build the project and upload it to the S2 board
 platform = https://github.com/platformio/platform-espressif32.git#feature/arduino-upstream
 board = esp32-s2-saola-1
 framework = arduino
-platform_packages = framework-arduinoespressif32 @ https://github.com/espressif/arduino-esp32.git#idf-master
+platform_packages = framework-arduinoespressif32 @ https://github.com/espressif/arduino-esp32.git
 monitor_speed = 115200
 monitor_flags = --echo
 monitor_filters = send_on_enter, colorize, esp32_exception_decoder
 board_build.f_cpu = 240000000L
 board_build.mcu = esp32s2
 ; set frequency to 80MHz
 board_build.f_flash = 80000000L
-board_build.flash_mode = dio
+board_build.flash_mode = qio
 ; None
 build_flags =   -DCORE_DEBUG_LEVEL=0 -DARDUINO_USB_CDC_ON_BOOT=0 -DARDUINO_USB_MSC_ON_BOOT=0 -DARDUINO_USB_DFU_ON_BOOT=0
 board_build.partitions = min_spiffs.csv