Fix the problem of unusable programming port for some Due boards

README.md

@@ -1,3 +1,7 @@
+This is a fork from the original repository for Arduino Due. This work solves the problem that some boards cannot be uploaded by the programming port.
+
+The main changes are located in firmwares/atmega16u2.
+
 # Arduino Core for SAM3X CPU
 
 This repository contains the source code and configuration files of the Arduino Core for Atmel's SAM3X processor (used on the [Arduino Due](https://www.arduino.cc/en/Main/ArduinoBoardDue) board).

firmwares/atmega16u2/Arduino-DUE-usbserial-prod-firmware-2020-07-19.hex

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firmwares/atmega16u2/arduino-usbserial/Arduino-usbserial.c

@@ -161,8 +161,8 @@ int main(void)
 			{
 				// SAM3X RESET/ERASE Sequence
 				// --------------------------
-				// Between 60 and 120: do erase
-				if (ResetTimer >= 60 && ResetTimer <= 120) {
+				// Between 60 and 120: do erase, 60 count = 250ms
+				if (ResetTimer >= 60 && ResetTimer <= 180) {
 					setErasePin(true);
 				} else {
 					setErasePin(false);
@@ -300,7 +300,7 @@ void EVENT_CDC_Device_ControLineStateChanged(USB_ClassInfo_CDC_Device_t* const C
 
 	if (Selected1200BPS) {
 		/* Start Erase / Reset procedure when receiving the magic "1200" baudrate */
-		ResetTimer = 120;
+		ResetTimer = 180;
 	} else if (!PreviousDTRState && CurrentDTRState) {
 		/* Reset on rising edge of DTR */
 		ResetTimer = 50;

firmwares/atmega16u2/arduino-usbserial/readme.txt

@@ -1,14 +1,8 @@
-To setup the project and upload the Arduino usbserial application firmware to an ATMEGA32U2 using the Arduino USB DFU bootloader:
-1. unpack the source into LUFA's Projects directory
-2. set ARDUINO_MODEL_PID in the makefile as appropriate
-3. do "make clean; make"
-4. put the 32U2 into USB DFU mode:
-4.a. assert and hold the 32U2's RESET line
-4.b. assert and hold the 32U2's HWB line
-4.c. release the 32U2's RESET line
-4.d. release the 32U2's HWB line
-5. confirm that the board enumerates as "ATmega32u2"
-6. do "make dfu" (OS X or Linux - dfu-programmer must be installed first) or "make flip" (Windows - Flip must be installed first)
-
-Check that the board enumerates as "Arduino Mega 2560".
+To setup the project and upload the Arduino usbserial application firmware to an ATMEGA16U2:
+1. unpack the source into LUFA's Projects directory (LUFA version 100807, http://www.fourwalledcubicle.com/LUFA.php)
+2. set ARDUINO_MODEL_PID in the makefile as appropriate, default is Arduino Due
+3. do "make clean; make" (the makefile is for winavr)
+4. do the connections as in https://www.arduino.cc/en/Hacking/Upgrading16U2Due
+5. upload Arduino-usbserial.hex by a proper method with a proper programmer (Arduino as ISP, USBASP, etc.)
+6. disconnect the programmer
 Test by uploading a new Arduino sketch from the Arduino IDE.