Bootloader is Deleted When Programming to ATSAMD21G18 Controller

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berkay_91

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If there is no Crystal (32.768 kHz) for the Internal RTC Unit of the SAMD21G18 Processor in the Designed Board

C:\Users\Berkay\AppData\Local\Arduino15\packages\adafruit\hardware\samd\1.7.10

The line in the file "boards" in the file path
adafruit_feather_m0_express.build.extra_flags=-D__SAMD21G18A__ -DARDUINO_SAMD_FEATHER_M0 -DARDUINO_SAMD_FEATHER_M0 -DARDUINO_SAMD_ZERO -DARM_MATH_CM0PLUS {build.usb_flags}

should be changed as below
adafruit_feather_m0_express.build.extra_flags=-D__SAMD21G18A__ -DCRYSTALLESS -DARDUINO_SAMD_FEATHER_M0 -DARDUINO_SAMD_FEATHER_M0 -DARDUINO_SAMD_ZERO -DARM_MATH_CM0PLUS {build.usb_flags}
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solution

If there is no Crystal (32.768 kHz) for the Internal RTC Unit of the SAMD21G18 Processor in the Designed Board

C:\Users\Berkay\AppData\Local\Arduino15\packages\adafruit\hardware\samd\1.7.10

The line in the file "boards" in the file path
adafruit_feather_m0_express.build.extra_flags=-D__SAMD21G18A__ -DARDUINO_SAMD_FEATHER_M0 -DARDUINO_SAMD_FEATHER_M0 -DARDUINO_SAMD_ZERO -DARM_MATH_CM0PLUS {build.usb_flags}

should be changed as below
adafruit_feather_m0_express.build.extra_flags=-D__SAMD21G18A__ -DCRYSTALLESS -DARDUINO_SAMD_FEATHER_M0 -DARDUINO_SAMD_FEATHER_M0 -DARDUINO_SAMD_ZERO -DARM_MATH_CM0PLUS {build.usb_flags}
 
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