Fix the problem of unusable programming port for some Due boards #123
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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.
Fix some mistakes and add some information to make it easier for future developments.
Update readme.txt
Update Arduino-usbserial.c
make the erase time longer to fix the unusable programming port for some board
Make the erase time longer to fix the unusable programming port for some Arduino Due boards.
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Fix the problem of unusable programming port for some Due boards by making the erase time longer.
https://forum.arduino.cc/t/cannot-upload-to-arduino-due-except-when-pressing-button-erase/517605
Add some readme information based on https://petervanhoyweghen.wordpress.com/2013/02/25/modifying-the-atmega16u2-firmware-on-the-due/
By adopting the proposed changes, the problem is generally solved. The problem will only occur when a heavy serial port usage is in the running program. It is reasonable and it can be overcome by pressing the erase button or clicking upload more times.