Hi i am new to samd21 based microcontroller.. I have to program the board which is customized one. Its based on atsamd21g18a microcontroller.
I tried to program in Arduino IDE
In board select menu which one i would select that's my doubt.
I searched more in internet i didn't get proper answer. Hope you understand my problem
Thanks
they have all the same SAMD21G in the Arduino SAMD package, but the pinout of boards headers is different. the MCU has more pins then are broken out to PCB headers so pin accessible on one board can be used internally on other board.
so the most important here is the pin mapping in the variant configuration.
I'm using it successfully to program the Seeed Studio Xiao BLE Sence product, It uses the nrf52840
atSAMD21G18a , Platformio and Arduino 2.0 works perfect.
HTH
GL 
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