X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/2c806f6ceee42db9094eb11f3f32524b98440726..0da99447d3e88e83f9977501bee56af5c7aa56c0:/Bootloaders/HID/BootloaderHID.c

diff --git a/Bootloaders/HID/BootloaderHID.c b/Bootloaders/HID/BootloaderHID.c
index 2359a82f5..c32dddc15 100644
--- a/Bootloaders/HID/BootloaderHID.c
+++ b/Bootloaders/HID/BootloaderHID.c
@@ -7,7 +7,7 @@
 */
 
 /*
-  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
@@ -41,6 +41,29 @@
  */
 static bool RunBootloader = true;
 
+/** 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;
+
+
+/** 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.
+ */
+void Application_Jump_Check(void)
+{
+	/* 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))
+	{
+		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.
  */
@@ -58,6 +81,9 @@ int main(void)
 	/* Disconnect from the host - USB interface will be reset later along with the AVR */
 	USB_Detach();
 
+	/* Unlock the forced application start mode of the bootloader if it is restarted */
+	MagicBootKey = MAGIC_BOOT_KEY;
+
 	/* Enable the watchdog and force a timeout to reset the AVR */
 	wdt_enable(WDTO_250MS);
 
@@ -85,9 +111,7 @@ static void SetupHardware(void)
 void EVENT_USB_Device_ConfigurationChanged(void)
 {
 	/* Setup HID Report Endpoint */
-	Endpoint_ConfigureEndpoint(HID_IN_EPNUM, EP_TYPE_INTERRUPT,
-		                       ENDPOINT_DIR_IN, HID_IN_EPSIZE,
-	                           ENDPOINT_BANK_SINGLE);
+	Endpoint_ConfigureEndpoint(HID_IN_EPADDR, EP_TYPE_INTERRUPT, HID_IN_EPSIZE, 1);
 }
 
 /** Event handler for the USB_ControlRequest event. This is used to catch and process control requests sent to