Update Arduino-usbserial.c #1
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Fix the unusable programming port by making the erase time longer (250ms->500ms). According to the datasheet, the recommended erase time is greater than 220ms. In most cases the original program should be OK. However, in my case, the uploading is almost 90% fail rate (Device not found at comx port...). But I can manually press the erase button before the uploading, and it works well. After the proposed changes, the programming port works as expected and I no longer necessary to hit the erase button.
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Fix the unusable programming port by making the erase time longer (250ms->500ms).
According to the datasheet, the recommended erase time is greater than 220ms. In most cases the original program should be OK. However, in my case, the uploading is almost 90% fail rate (Device not found at comx port...). But I can manually press the erase button before the uploading, and it works well. After the proposed changes, the programming port works as expected and I no longer necessary to hit the erase button.