From 79481252081da0bdc4501cf039c060efcdf85c95 Mon Sep 17 00:00:00 2001
From: Zach Eveland <zeveland@blacklabel-development.com>
Date: Tue, 14 Feb 2012 12:17:30 -0500
Subject: [PATCH] Leonardo now checks whether bootloader should be run after a
 WDT event.

Before the sketch initiates an auto-reset for upload it pokes a magic word into a specific RAM address.  On starting the bootloader checks this address.  If it finds the magic word it knows the bootloader code should run. If not it jumps straight back to sketch.

Test in a sketch by adding to setup():
wdt_enable(WDTO_2S);

Sketch should upload, start, run for two seconds, WDT, and sketch should restart (not bootloader).

Had to cut out unused descriptor code to make the bootloader still fit in 4k.
---
 bootloaders/caterina_LUFA/Caterina.c    |   8 +
 bootloaders/caterina_LUFA/Caterina.h    |   2 +-
 bootloaders/caterina_LUFA/Caterina.hex  | 364 ++++++++++++------------
 bootloaders/caterina_LUFA/Descriptors.c |  12 +-
 cores/arduino/CDC.cpp                   |   3 +-
 5 files changed, 200 insertions(+), 189 deletions(-)

diff --git a/bootloaders/caterina_LUFA/Caterina.c b/bootloaders/caterina_LUFA/Caterina.c
index b6fbd9b..d4dbb7b 100755
--- a/bootloaders/caterina_LUFA/Caterina.c
+++ b/bootloaders/caterina_LUFA/Caterina.c
@@ -64,6 +64,9 @@ uint16_t RxLEDPulse = 0; // time remaining for Rx LED pulse
 /* Bootloader timeout timer */
 uint16_t Timeout = 0;
 
+uint16_t bootKey = 0x7777;
+volatile uint16_t *const bootKeyPtr = (volatile uint16_t *)0x0A00;
+
 void StartSketch(void)
 {
 	cli();
@@ -118,6 +121,11 @@ int main(void)
 	if (mcusr_state & (1<<PORF) && pgm_read_word(0) != 0xFFFF) {		
 		StartSketch();
 	}
+	uint16_t bootKeyPtrVal = *bootKeyPtr;
+	*bootKeyPtr = 0;
+	if ((mcusr_state & (1<<WDRF)) && (bootKeyPtrVal != bootKey) && (pgm_read_word(0) != 0xFFFF)) {	
+		StartSketch();
+	}
 	
 	/* Setup hardware required for the bootloader */
 	SetupHardware();
diff --git a/bootloaders/caterina_LUFA/Caterina.h b/bootloaders/caterina_LUFA/Caterina.h
index 7f37063..f8251d4 100755
--- a/bootloaders/caterina_LUFA/Caterina.h
+++ b/bootloaders/caterina_LUFA/Caterina.h
@@ -80,7 +80,7 @@
 
 	/* Function Prototypes: */
 		void StartSketch(void);
-		void LEDPulse();
+		void LEDPulse(void);
 	
 		void CDC_Task(void);
 		void SetupHardware(void);
diff --git a/bootloaders/caterina_LUFA/Caterina.hex b/bootloaders/caterina_LUFA/Caterina.hex
index 3657484..7e19013 100644
--- a/bootloaders/caterina_LUFA/Caterina.hex
+++ b/bootloaders/caterina_LUFA/Caterina.hex
@@ -1,6 +1,6 @@
 :1070000055C000006EC000006CC000006AC00000E7
 :1070100068C0000066C0000064C0000062C00000DC
-:1070200060C000005EC00000DCC400005AC0000068
+:1070200060C000005EC00000F8C400005AC000004C
 :1070300058C0000056C0000054C0000052C00000FC
 :1070400050C0000078C000004CC000004AC00000E2
 :1070500048C0000046C0000044C0000042C000001C
@@ -9,22 +9,22 @@
 :1070800030C000002EC000002CC000002AC000004C
 :1070900028C0000026C0000024C0000022C000005C
 :1070A00020C000001EC000001CC0000011241FBE34
-:1070B000CFEFDAE0DEBFCDBF11E0A0E0B1E0E6E067
-:1070C000FFE702C005900D92A03CB107D9F711E08F
-:1070D000A0ECB1E001C01D92A63DB107E1F78ED34F
-:1070E00010C78ECFF89410926F001092810010920A
+:1070B000CFEFDAE0DEBFCDBF11E0A0E0B1E0EEE35C
+:1070C000FFE702C005900D92A83AB107D9F711E089
+:1070D000A8EAB1E001C01D92AE3BB107E1F78ED343
+:1070E0002CC78ECFF89410926F00109281001092EE
 :1070F00085001092840081E085BF15BE47985D9A97
-:10710000289A0C94000008952091CA013091CB0177
-:107110002F5F3F4F3093CB012093CA01932F37FF4E
+:10710000289A0C94000008952091B2013091B301A7
+:107110002F5F3F4F3093B3012093B201932F37FF7E
 :1071200003C08EEF831B982F990F921710F4479886
 :107130000895479A08951F920F920FB60F92112447
 :107140002F938F939F93EF93FF931092850010924C
-:1071500084008091C0019091C101009741F0019796
-:107160009093C1018093C001892B09F45D9A8091AD
-:10717000C2019091C301009741F001979093C30120
-:107180008093C201892B09F4289AE0E0F0E0859110
-:1071900094918F5F9F4F49F08091C4019091C501F8
-:1071A00001969093C5018093C401FF91EF919F9147
+:1071500084008091A8019091A901009741F00197C6
+:107160009093A9018093A801892B09F45D9A8091DD
+:10717000AA019091AB01009741F001979093AB0168
+:107180008093AA01892B09F4289AE0E0F0E0859128
+:1071900094918F5F9F4F49F08091AC019091AD0128
+:1071A00001969093AD018093AC01FF91EF919F9177
 :1071B0008F912F910F900FBE0F901F90189584E024
 :1071C0008093E9000DC08091E8008B778093E80000
 :1071D00003C08EB3882351F08091E80082FFF9CF7D
@@ -32,12 +32,12 @@
 :1071F00083E08093E9008091E80085FD0DC08091D7
 :10720000E8008E778093E80003C08EB3882369F08E
 :107210008091E80080FFF9CF9093F1005D9884E6BB
-:1072200090E09093C1018093C00108954F925F92C6
+:1072200090E09093A9018093A80108954F925F92F6
 :107230006F927F928F929F92AF92BF92CF92DF9286
 :10724000EF92FF920F931F93CF93DF9384E080938D
 :10725000E9008091E80082FF56C2289884E690E019
-:107260009093C3018093C201AADF182F853419F4CB
-:107270001092090103C0843519F4A1DF8DE019C211
+:107260009093AB018093AA01AADF182F853419F4FB
+:1072700010920D0103C0843519F4A1DF8DE019C20D
 :107280008C34E1F38035D1F3843721F484E4AFDF2B
 :1072900080E00FC2813611F489E50BC28134B1F46C
 :1072A0008EDF182F8CDF90E0880F991FAA2797FD9B
@@ -57,54 +57,54 @@
 :107380005700849196C1813539F4E2E0F0E089E05C
 :107390008093570084918DC1823631F489E527DFCF
 :1073A00080E025DF80E885C1823419F0873609F056
-:1073B000E5C01092C5011092C40101DF082FFFDE65
+:1073B000E5C01092AD011092AC0101DF082FFFDE95
 :1073C000F82EFDDE682E8554823008F071C1902FB2
 :1073D00080E0CF2DD0E0C82BD92B10926F0017364C
 :1073E00009F04BC081E180935700E895DD24CC245F
-:1073F000C3943FC0E090C601F090C7010091C8015E
-:107400001091C901B6E46B16D9F4ED2DF0E0EE2928
+:1073F000C3943FC0E090AE01F090AF010091B001A6
+:107400001091B101B6E46B16D9F4ED2DF0E0EE2940
 :10741000FF29E4918E2FEBDEDD2081F082E090E009
-:10742000A0E0B0E0E80EF91E0A1F1B1FE092C601A3
-:10743000F092C7010093C8011093C901DC2418C061
-:10744000D801C701B695A7959795879544D5CFDE06
+:10742000A0E0B0E0E80EF91E0A1F1B1FE092AE01BB
+:10743000F092AF010093B0011093B101DC2418C0A9
+:10744000D801C701B695A7959795879560D5CFDEEA
 :1074500082E090E0A0E0B0E0E80EF91E0A1F1B1FDA
-:10746000E092C601F092C7010093C8011093C901D0
-:107470002197209709F0BECF7DC08090C6019090E3
-:10748000C701A090C801B090C90196E4691609F03F
+:10746000E092AE01F092AF010093B0011093B10130
+:107470002197209709F0BECF7DC08090AE019090FB
+:10748000AF01A090B001B090B10196E4691609F087
 :107490005DC083E0F40180935700E89507B600FCD7
 :1074A000FDCF54C0F6E46F1661F5772031F1E0901E
-:1074B000C601F090C7010091C8011091C9017FDE9B
+:1074B000AE01F090AF010091B0011091B1017FDEFB
 :1074C000D82ECC24852D90E08C299D29F7010C0124
 :1074D00040925700E895112482E090E0A0E0B0E0EF
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-:1075000023C0E090C601F090C7010091C80110911E
-:10751000C90116950795F794E79451DE682FC701C6
-:10752000E2D48091C6019091C701A091C801B091A9
-:10753000C9010296A11DB11D8093C6019093C70198
-:10754000A093C801B093C901219704C055247724A2
+:1074E000E80EF91E0A1F1B1FE092AE01F092AF01D9
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+:1075000023C0E090AE01F090AF010091B001109166
+:10751000B10116950795F794E79451DE682FC701DE
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 :1075500044244394209709F0A5CF96E4691641F49A
 :1075600085E0F40180935700E89507B600FCFDCF55
 :107570008DE03DDE82E080936F009CC0833471F427
-:107580000091C6011091C7011ADE90E021E0F801D8
+:107580000091AE011091AF011ADE90E021E0F80108
 :107590000C0120935700E895112470CE833619F51D
-:1075A000E090C601F090C7010091C8011091C90197
+:1075A000E090AE01F090AF010091B0011091B101F7
 :1075B00006DEF701E16090E021E00C012093570026
 :1075C000E895112482E090E0A0E0B0E0E80EF91E1A
-:1075D0000A1F1B1FE092C601F092C7010093C80169
-:1075E0001093C9014BCE8D3661F4E091C601F09144
-:1075F000C70185E080935700E89507B600FCFDCFF2
-:107600003DCE823551F4E091C601F091C70105915C
+:1075D0000A1F1B1FE092AE01F092AF010093B001B1
+:1075E0001093B1014BCE8D3661F4E091AE01F09174
+:1075F000AF0185E080935700E89507B600FCFDCF0A
+:107600003DCE823551F4E091AE01F091AF0105918C
 :107610001491812FECDD802F4CC0843421F5E09053
-:10762000C601F090C7010091C8011091C9011695DB
-:107630000795F794E794C3DD682FC70154D4809170
-:10764000C6019091C701A091C801B091C9010296ED
-:10765000A11DB11D8093C6019093C701A093C801DD
-:10766000B093C9010BCE843609F5E090C601F090C5
-:10767000C7010091C8011091C901D801C701B69591
-:10768000A7959795879527D4B2DD82E090E0A0E09A
-:10769000B0E0E80EF91E0A1F1B1FE092C601F0922F
-:1076A000C7010093C8011093C90104C08B3111F0C8
+:10762000AE01F090AF010091B0011091B10116953B
+:107630000795F794E794C3DD682FC70170D4809154
+:10764000AE019091AF01A091B001B091B10102964D
+:10765000A11DB11D8093AE019093AF01A093B00125
+:10766000B093B1010BCE843609F5E090AE01F090F5
+:10767000AF010091B0011091B101D801C701B695D9
+:10768000A7959795879543D4B2DD82E090E0A0E07E
+:10769000B0E0E80EF91E0A1F1B1FE092AE01F09247
+:1076A000AF010093B0011093B10104C08B3111F010
 :1076B0008FE39DDD83E08093E9009091E800809165
 :1076C000E8008E778093E80095FF04C010C08EB369
 :1076D0008823C9F08091E80080FFF9CF8091E8000D
@@ -112,144 +112,146 @@
 :1076F000E80080FFF9CF84E08093E9008091E80002
 :107700008B778093E800DF91CF911F910F91FF90CD
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 :10776000E8000895913279F48091E800877F809352
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diff --git a/bootloaders/caterina_LUFA/Descriptors.c b/bootloaders/caterina_LUFA/Descriptors.c
index b5b1aee..f1756e2 100755
--- a/bootloaders/caterina_LUFA/Descriptors.c
+++ b/bootloaders/caterina_LUFA/Descriptors.c
@@ -195,14 +195,14 @@ const USB_Descriptor_String_t ProductString =
 
 	.UnicodeString          = L"Arduino Leonardo"
 };
-
+/*
 const USB_Descriptor_String_t SerialNumString = 
 {
 	.Header					= {.Size = USB_STRING_LEN(12), .Type = DTYPE_String},
 	
 	.UnicodeString			= L"000000001452"
 };
-
+*/
 const USB_Descriptor_String_t ManufNameString = 
 {
 	.Header					= {.Size = USB_STRING_LEN(11), .Type = DTYPE_String},
@@ -246,10 +246,10 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 			{
 				Address = &ProductString;
 				Size    = ProductString.Header.Size;
-			} else if (DescriptorNumber == DeviceDescriptor.SerialNumStrIndex)
-			{
-				Address = &SerialNumString;
-				Size 	= SerialNumString.Header.Size;
+//			} else if (DescriptorNumber == DeviceDescriptor.SerialNumStrIndex)
+//			{
+//				Address = &SerialNumString;
+//				Size 	= SerialNumString.Header.Size;
 			} else if (DescriptorNumber == DeviceDescriptor.ManufacturerStrIndex)
 			{
 				Address = &ManufNameString;
diff --git a/cores/arduino/CDC.cpp b/cores/arduino/CDC.cpp
index deda5c0..0fa06bc 100644
--- a/cores/arduino/CDC.cpp
+++ b/cores/arduino/CDC.cpp
@@ -105,7 +105,8 @@ bool WEAK CDC_Setup(Setup& setup)
 			// open at 1200 bps, is closed.  this is the signal to start the watchdog
 			// with a relatively long period so it can finish housekeeping tasks
 			// like servicing endpoints before the sketch ends
-			if (0 != _usbLineInfo.lineState && 1200 == _usbLineInfo.dwDTERate) {	
+			if (0 != _usbLineInfo.lineState && 1200 == _usbLineInfo.dwDTERate) {
+				*(uint16_t *)0x0A00 = 0x7777;
 				wdt_enable(WDTO_2S);
 			}
 			return true;