How to test we compile a M5Stack ?
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 On a source file, we have to test if we compile an M5Stack or ESP32LoRa or a ESP8266. Is there a specific variable to test like : 
 #ifdef ESP8266I know that we can test ESP32 but it's not enought to define the difference berween a ESP32 and a M5Stack... 
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 Hi, will these work for you ? They are specifically used in code for the M5Stack. #include <M5Stack.h> 
 M5.begin();
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 try: #ifdef ARDUINO_M5Stack-Core-ESP32as is declared in arduino boards: 
 https://github.com/espressif/arduino-esp32/blob/master/boards.txt#L1169
 but this is temporary solution because hyphens are not valid for arduino.We waiting for some changes... 
 "issue" is added: https://github.com/m5stack/M5Stack/issues/41

