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The library bootloaders will now correctly start the user application after a watchdog-based application start, even if the /HWB line is held low externally during the reset phase.

This commit is contained in:
Dean Camera 2012-04-29 17:15:06 +00:00
parent cc959c945b
commit 04740d680e
8 changed files with 92 additions and 2 deletions
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24
Bootloaders/CDC/BootloaderCDC.c
View File

@ -56,6 +56,27 @@ static uint32_t CurrAddress;
*/
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.
*/
uint32_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;
((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
@ -80,6 +101,9 @@ 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);

5
Bootloaders/CDC/BootloaderCDC.h
View File

@ -67,6 +67,9 @@
/** Eight character bootloader firmware identifier reported to the host when requested */
#define SOFTWARE_IDENTIFIER "LUFACDC"
/** Magic bootloader key to unlock forced application start mode. */
#define MAGIC_BOOT_KEY 0xDC42CACA
/* Type Defines: */
/** Type define for a non-returning pointer to the start of the loaded application in flash memory. */
typedef void (*AppPtr_t)(void) ATTR_NO_RETURN;
@ -75,6 +78,8 @@
static void CDC_Task(void);
static void SetupHardware(void);
void Application_Jump_Check(void) ATTR_INIT_SECTION(3);
void EVENT_USB_Device_ConfigurationChanged(void);
#if defined(INCLUDE_FROM_BOOTLOADERCDC_C) || defined(__DOXYGEN__)

24
Bootloaders/DFU/BootloaderDFU.c
View File

@ -92,6 +92,27 @@ 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.
*/
uint32_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;
AppStartPtr();
}
}
/** 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
@ -695,6 +716,9 @@ 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);
}

5
Bootloaders/DFU/BootloaderDFU.h
View File

@ -66,6 +66,9 @@
/** Minor bootloader version number. */
#define BOOTLOADER_VERSION_REV 0
/** Magic bootloader key to unlock forced application start mode. */
#define MAGIC_BOOT_KEY 0xDC42CACA
/** Complete bootloader version number expressed as a packed byte, constructed from the
* two individual bootloader version macros.
@ -206,6 +209,8 @@
static void ProcessWriteCommand(void);
static void ProcessReadCommand(void);
#endif
void Application_Jump_Check(void) ATTR_INIT_SECTION(3);
#endif

25
Bootloaders/HID/BootloaderHID.c
View File

@ -41,6 +41,28 @@
*/
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.
*/
uint32_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;
((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 +80,9 @@ 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);

5
Bootloaders/HID/BootloaderHID.h
View File

@ -52,9 +52,14 @@
/** Bootloader special address to start the user application */
#define COMMAND_STARTAPPLICATION 0xFFFF
/** Magic bootloader key to unlock forced application start mode. */
#define MAGIC_BOOT_KEY 0xDC42CACA
/* Function Prototypes: */
static void SetupHardware(void);
void Application_Jump_Check(void) ATTR_INIT_SECTION(3);
void EVENT_USB_Device_ConfigurationChanged(void);
void EVENT_USB_Device_UnhandledControlRequest(void);

2
LUFA.pnproj
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File diff suppressed because one or more lines are too long

4
LUFA/DoxygenPages/ChangeLog.txt
View File

@ -35,11 +35,13 @@
* - Pipes are now configured via instances of a new struct USB_Pipe_Table_t in all host mode class drivers, rather than a list of pipe parameters
* - Added support for various assert and debugging macros for the UC3 devices
* - Changed MIDI event structure MIDI_EventPacket_t to use a single field for the combined virtual cable index and command ID, to prevent bitfield packing issues
* on some architectures (thanks to Darren Gibbs).
* on some architectures (thanks to Darren Gibbs)
* - Library Applications:
* - Raised the guard bits in the AVRISP-MKII clone project when in PDI and TPI to 32, to prevent communication errors on low quality connections to a target
* - Added additional bootloader API data to expose the bootloader start address and class to the DFU and CDC class bootloaders
* - Reverted AVRISP-MKII clone project watchdog based command timeout patch in favour of a hardware timer, to allow for use in devices with WDTRST fuse programmed
* - The library bootloaders will now correctly start the user application after a watchdog-based application start, even if the /HWB line is held low externally
* during the reset phase
*
* <b>Fixed:</b>
* - Core: