diff options
Diffstat (limited to 'Bootloaders/HID/BootloaderHID.c')
| -rw-r--r-- | Bootloaders/HID/BootloaderHID.c | 30 |
1 files changed, 27 insertions, 3 deletions
diff --git a/Bootloaders/HID/BootloaderHID.c b/Bootloaders/HID/BootloaderHID.c index 928000f8b..acc351a30 100644 --- a/Bootloaders/HID/BootloaderHID.c +++ b/Bootloaders/HID/BootloaderHID.c @@ -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. + */ +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; + // 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 |