platformio example PSRAM

[env:esp-idf-esp-wrover-kit]
platform = espressif32
; CHANGE BELOW TO YOUR BOARD. Platform IO has a drop down list of boards
; you choose from when you create a new project.
; it uses that to build the initial ini file for you.
; you can then edit that file
board = esp-wrover-kit
; below would be Arduino for arduino. Again, platformIO gives you a menu
; to choose this when you create a new project
framework = espidf
upload_speed=921600
monitor_speed=115200
; on linux below would be like /dev/tty3 or something
; you don't usually need it because platformio detects
; it. sometimes that doesn't work though or you have
; more than one board plugged in.
; uncomment this and set it if you need to
;upload_port = COM5
; you don't need this but i use it to enable C++14
; which is the highest C++ std you can get under
; platformIO unless you're using linux
build_unflags=-std=gnu++11
; the first flag is for the C++14 std
; the other flags are to enable psram
build_flags=-std=gnu++14
            -DBOARD_HAS_PSRAM
            -mfix-esp32-psram-cache-issue