X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/9f99c7fa03b57b604e622e3e839085006d689f26..0da99447d3e88e83f9977501bee56af5c7aa56c0:/Bootloaders/DFU/BootloaderDFU.c

diff --git a/Bootloaders/DFU/BootloaderDFU.c b/Bootloaders/DFU/BootloaderDFU.c
index f3b36db61..fcacf76cb 100644
--- a/Bootloaders/DFU/BootloaderDFU.c
+++ b/Bootloaders/DFU/BootloaderDFU.c
@@ -1,13 +1,13 @@
 /*
              LUFA Library
-     Copyright (C) Dean Camera, 2011.
+     Copyright (C) Dean Camera, 2012.
 
   dean [at] fourwalledcubicle [dot] com
            www.lufa-lib.org
 */
 
 /*
-  Copyright 2011  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+  Copyright 2012  Dean Camera (dean [at] fourwalledcubicle [dot] com)
 
   Permission to use, copy, modify, distribute, and sell this
   software and its documentation for any purpose is hereby granted
@@ -92,33 +92,65 @@ static uint16_t StartAddr = 0x0000;
  */
 static uint16_t EndAddr = 0x0000;
 
+/** Magic lock for forced application start. If the HWBE fuse is programmed and BOOTRST is unprogrammed, the bootloader
+ *  will start if the /HWB line of the AVR is held low and the system is reset. However, if the /HWB line is still held
+ *  low when the application attempts to start via a watchdog reset, the bootloader will re-start. If set to the value
+ *  \ref MAGIC_BOOT_KEY the special init function \ref Application_Jump_Check() will force the application to start.
+ */
+uint16_t MagicBootKey ATTR_NO_INIT;
 
-/** Main program entry point. This routine configures the hardware required by the bootloader, then continuously
- *  runs the bootloader processing routine until instructed to soft-exit, or hard-reset via the watchdog to start
- *  the loaded application code.
+
+/** Special startup routine to check if the bootloader was started via a watchdog reset, and if the magic application
+ *  start key has been loaded into \ref MagicBootKey. If the bootloader started via the watchdog and the key is valid,
+ *  this will force the user application to start via a software jump.
  */
-int main(void)
+void Application_Jump_Check(void)
 {
-	/* Configure hardware required by the bootloader */
-	SetupHardware();
+	bool JumpToApplication = false;
 
 	#if ((BOARD == BOARD_XPLAIN) || (BOARD == BOARD_XPLAIN_REV1))
-	/* Disable JTAG debugging */
-	MCUCR |= (1 << JTD);
-	MCUCR |= (1 << JTD);
+		/* Disable JTAG debugging */
+		JTAG_DISABLE();
 
-	/* Enable pull-up on the JTAG TCK pin so we can use it to select the mode */
-	PORTF |= (1 << 4);
-	Delay_MS(10);
+		/* Enable pull-up on the JTAG TCK pin so we can use it to select the mode */
+		PORTF |= (1 << 4);
+		Delay_MS(10);
 
-	/* If the TCK pin is not jumpered to ground, start the user application instead */
-	RunBootloader = (!(PINF & (1 << 4)));
+		/* If the TCK pin is not jumpered to ground, start the user application instead */
+		JumpToApplication |= ((PINF & (1 << 4)) != 0);
 
-	/* Re-enable JTAG debugging */
-	MCUCR &= ~(1 << JTD);
-	MCUCR &= ~(1 << JTD);
+		/* Re-enable JTAG debugging */
+		JTAG_ENABLE();
 	#endif
 
+	/* If the reset source was the bootloader and the key is correct, clear it and jump to the application */
+	if ((MCUSR & (1 << WDRF)) && (MagicBootKey == MAGIC_BOOT_KEY))
+	  JumpToApplication |= true;
+
+	/* If a request has been made to jump to the user application, honor it */
+	if (JumpToApplication)
+	{
+		/* Turn off the watchdog */
+		MCUSR &= ~(1<<WDRF);
+		wdt_disable(); 
+
+		/* Clear the boot key and jump to the user application */
+		MagicBootKey = 0;
+
+		// cppcheck-suppress constStatement
+		((void (*)(void))0x0000)();
+	}
+}
+
+/** Main program entry point. This routine configures the hardware required by the bootloader, then continuously
+ *  runs the bootloader processing routine until instructed to soft-exit, or hard-reset via the watchdog to start
+ *  the loaded application code.
+ */
+int main(void)
+{
+	/* Configure hardware required by the bootloader */
+	SetupHardware();
+
 	/* Turn on first LED on the board to indicate that the bootloader has started */
 	LEDs_SetAllLEDs(LEDS_LED1);
 
@@ -165,6 +197,10 @@ static void ResetHardware(void)
 	/* Shut down the USB and other board hardware drivers */
 	USB_Disable();
 	LEDs_Disable();
+	
+	/* Disable Bootloader active LED toggle timer */
+	TIMSK1 = 0;
+	TCCR1B = 0;
 
 	/* Relocate the interrupt vector table back to the application section */
 	MCUCR = (1 << IVCE);
@@ -641,7 +677,7 @@ static void ProcessMemReadCommand(void)
 	{
 		uint32_t CurrFlashAddress = 0;
 
-		while (CurrFlashAddress < BOOT_START_ADDR)
+		while (CurrFlashAddress < (uint32_t)BOOT_START_ADDR)
 		{
 			/* Check if the current byte is not blank */
 			#if (FLASHEND > 0xFFFF)
@@ -695,6 +731,9 @@ static void ProcessWriteCommand(void)
 		{
 			if (SentCommand.Data[1] == 0x00)                                   // Start via watchdog
 			{
+				/* Unlock the forced application start mode of the bootloader if it is restarted */
+				MagicBootKey = MAGIC_BOOT_KEY;
+
 				/* Start the watchdog to reset the AVR once the communications are finalized */
 				wdt_enable(WDTO_250MS);
 			}
@@ -710,7 +749,7 @@ static void ProcessWriteCommand(void)
 		uint32_t CurrFlashAddress = 0;
 
 		/* Clear the application section of flash */
-		while (CurrFlashAddress < BOOT_START_ADDR)
+		while (CurrFlashAddress < (uint32_t)BOOT_START_ADDR)
 		{
 			boot_page_erase(CurrFlashAddress);
 			boot_spm_busy_wait();