/*
LUFA Library
- Copyright (C) Dean Camera, 2012.
+ Copyright (C) Dean Camera, 2013.
dean [at] fourwalledcubicle [dot] com
www.lufa-lib.org
*/
/*
- Copyright 2011 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+ Copyright 2013 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
advertising or publicity pertaining to distribution of the
software without specific, written prior permission.
- The author disclaim all warranties with regard to this
+ The author disclaims all warranties with regard to this
software, including all implied warranties of merchantability
and fitness. In no event shall the author be liable for any
special, indirect or consequential damages or any damages
*/
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);
/* Enable global interrupts so that the USB stack can function */
- sei();
+ GlobalInterruptEnable();
/* Run the USB management task while the bootloader is supposed to be running */
while (RunBootloader || WaitForExit)
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);
MCUCR = 0;
case DFU_REQ_GETSTATUS:
Endpoint_ClearSETUP();
+ while (!(Endpoint_IsINReady()))
+ {
+ if (USB_DeviceState == DEVICE_STATE_Unattached)
+ return;
+ }
+
/* Write 8-bit status value */
Endpoint_Write_8(DFU_Status);
case DFU_REQ_GETSTATE:
Endpoint_ClearSETUP();
+ while (!(Endpoint_IsINReady()))
+ {
+ if (USB_DeviceState == DEVICE_STATE_Unattached)
+ return;
+ }
+
/* Write the current device state to the endpoint */
Endpoint_Write_8(DFU_State);
{
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)
{
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);
}
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();
static void ProcessReadCommand(void)
{
const uint8_t BootloaderInfo[3] = {BOOTLOADER_VERSION, BOOTLOADER_ID_BYTE1, BOOTLOADER_ID_BYTE2};
- const uint8_t SignatureInfo[3] = {AVR_SIGNATURE_1, AVR_SIGNATURE_2, AVR_SIGNATURE_3};
+ const uint8_t SignatureInfo[4] = {0x58, AVR_SIGNATURE_1, AVR_SIGNATURE_2, AVR_SIGNATURE_3};
uint8_t DataIndexToRead = SentCommand.Data[1];
- if (IS_ONEBYTE_COMMAND(SentCommand.Data, 0x00)) // Read bootloader info
- ResponseByte = BootloaderInfo[DataIndexToRead];
+ if (IS_ONEBYTE_COMMAND(SentCommand.Data, 0x00)) // Read bootloader info
+ {
+ ResponseByte = BootloaderInfo[DataIndexToRead];
+ }
else if (IS_ONEBYTE_COMMAND(SentCommand.Data, 0x01)) // Read signature byte
- ResponseByte = SignatureInfo[DataIndexToRead - 0x30];
+ {
+ if (DataIndexToRead < 0x60)
+ ResponseByte = SignatureInfo[DataIndexToRead - 0x30];
+ else
+ ResponseByte = SignatureInfo[DataIndexToRead - 0x60 + 3];
+ }
}
projects / pub / USBasp.git / blobdiff