From d6af1e40123aa0c877cc194c5fd75c9bd8d483c8 Mon Sep 17 00:00:00 2001
From: zhengqi-wang <75343331+zhengqi-wang@users.noreply.github.com>
Date: Mon, 19 Jul 2021 23:01:08 -0400
Subject: [PATCH 1/6] Update Arduino-usbserial.c
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.
---
firmwares/atmega16u2/arduino-usbserial/Arduino-usbserial.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/firmwares/atmega16u2/arduino-usbserial/Arduino-usbserial.c b/firmwares/atmega16u2/arduino-usbserial/Arduino-usbserial.c
index 715ff2b8..76aedf1c 100644
--- a/firmwares/atmega16u2/arduino-usbserial/Arduino-usbserial.c
+++ b/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;
From 759b7b780d67357da3e05be8b9f963f8f45d78ed Mon Sep 17 00:00:00 2001
From: zhengqi-wang <75343331+zhengqi-wang@users.noreply.github.com>
Date: Mon, 19 Jul 2021 23:19:34 -0400
Subject: [PATCH 2/6] Update readme.txt
Fix some mistakes and add some information to make it easier for future developments.
---
.../atmega16u2/arduino-usbserial/readme.txt | 20 +++++++------------
1 file changed, 7 insertions(+), 13 deletions(-)
diff --git a/firmwares/atmega16u2/arduino-usbserial/readme.txt b/firmwares/atmega16u2/arduino-usbserial/readme.txt
index ca9f0221..9a53f75d 100644
--- a/firmwares/atmega16u2/arduino-usbserial/readme.txt
+++ b/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.
From 288002f47fb941f1ba4949c7c3b95688805c958c Mon Sep 17 00:00:00 2001
From: zhengqi-wang <75343331+zhengqi-wang@users.noreply.github.com>
Date: Mon, 19 Jul 2021 23:28:02 -0400
Subject: [PATCH 3/6] fix the unusable programming port for some boards
make the erase time longer to fix the unusable programming port for some board
---
...DUE-usbserial-prod-firmware-2020-07-19.hex | 272 ++++++++++++++++++
1 file changed, 272 insertions(+)
create mode 100644 firmwares/atmega16u2/Arduino-DUE-usbserial-prod-firmware-2020-07-19.hex
diff --git a/firmwares/atmega16u2/Arduino-DUE-usbserial-prod-firmware-2020-07-19.hex b/firmwares/atmega16u2/Arduino-DUE-usbserial-prod-firmware-2020-07-19.hex
new file mode 100644
index 00000000..8576bb5c
--- /dev/null
+++ b/firmwares/atmega16u2/Arduino-DUE-usbserial-prod-firmware-2020-07-19.hex
@@ -0,0 +1,272 @@
+:10000000A7C00000C0C00000BEC00000BCC000000F
+:10001000BAC00000B8C00000B6C00000B4C0000004
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+:100030007DC40000A8C00000A6C00000A4C000004D
+:10004000A2C00000A0C000009EC000009CC0000034
+:100050009AC0000098C0000096C0000021C10000B6
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From 28d21e67e8122179b5cdb06f6a74e2e264026255 Mon Sep 17 00:00:00 2001
From: zhengqi-wang <75343331+zhengqi-wang@users.noreply.github.com>
Date: Mon, 19 Jul 2021 23:34:15 -0400
Subject: [PATCH 4/6] Delete Arduino-DUE-usbserial-prod-firmware-2020-07-19.hex
---
...DUE-usbserial-prod-firmware-2020-07-19.hex | 272 ------------------
1 file changed, 272 deletions(-)
delete mode 100644 firmwares/atmega16u2/Arduino-DUE-usbserial-prod-firmware-2020-07-19.hex
diff --git a/firmwares/atmega16u2/Arduino-DUE-usbserial-prod-firmware-2020-07-19.hex b/firmwares/atmega16u2/Arduino-DUE-usbserial-prod-firmware-2020-07-19.hex
deleted file mode 100644
index 8576bb5c..00000000
--- a/firmwares/atmega16u2/Arduino-DUE-usbserial-prod-firmware-2020-07-19.hex
+++ /dev/null
@@ -1,272 +0,0 @@
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From 2259dded0ee6e848a1f11b0cb644cd4ac54e301a Mon Sep 17 00:00:00 2001
From: zhengqi-wang <75343331+zhengqi-wang@users.noreply.github.com>
Date: Mon, 19 Jul 2021 23:39:15 -0400
Subject: [PATCH 5/6] Fix the unusable programming port for some boards
Make the erase time longer to fix the unusable programming port for some Arduino Due boards.
---
...DUE-usbserial-prod-firmware-2020-07-19.hex | 272 ++++++++++++++++++
1 file changed, 272 insertions(+)
create mode 100644 firmwares/atmega16u2/Arduino-DUE-usbserial-prod-firmware-2020-07-19.hex
diff --git a/firmwares/atmega16u2/Arduino-DUE-usbserial-prod-firmware-2020-07-19.hex b/firmwares/atmega16u2/Arduino-DUE-usbserial-prod-firmware-2020-07-19.hex
new file mode 100644
index 00000000..8576bb5c
--- /dev/null
+++ b/firmwares/atmega16u2/Arduino-DUE-usbserial-prod-firmware-2020-07-19.hex
@@ -0,0 +1,272 @@
+:10000000A7C00000C0C00000BEC00000BCC000000F
+:10001000BAC00000B8C00000B6C00000B4C0000004
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+:1000D000FF09040100020A000000070504024000B5
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From e8baa0b3989fe24b1ef7c20b7ae1bf569c6c0766 Mon Sep 17 00:00:00 2001
From: zhengqi-wang <75343331+zhengqi-wang@users.noreply.github.com>
Date: Fri, 6 Aug 2021 18:03:03 -0400
Subject: [PATCH 6/6] Update README.md
---
README.md | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/README.md b/README.md
index 2faab39e..ab18e1d8 100644
--- a/README.md
+++ b/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).