int USBGetChar()
{
for(;;)
{
USBSetupInterrupt();
USBGeneralInterrupt();
// Read a char
if (HasData(CDC_RX))
{
u8 c = Recv8();
if (!ReadWriteAllowed())
ReleaseRX();
return c;
}
if (!--_timeout) {
Reboot(); // USB not connected, run firmware
}
_delay_us(100); // stretch out the bootloader period to about 5 seconds after enumeration
LEDPulse();
}
return -1;
}
/** Main program entry point. This routine configures the hardware required by the bootloader, then continuously
* runs the bootloader processing routine until it times out or is instructed to exit.
*/
int main(void)
{
/* Save the value of the boot key memory before it is overwritten */
uint16_t bootKeyPtrVal = *bootKeyPtr;
*bootKeyPtr = 0;
/* Check the reason for the reset so we can act accordingly */
uint8_t mcusr_state = MCUSR; // store the initial state of the Status register
MCUSR = 0; // clear all reset flags
/* Watchdog may be configured with a 15 ms period so must disable it before going any further */
wdt_disable();
#if DEVICE_PID == 0x606C // Only on the BlinkyTape
// Put the user button (B6) in input_pullup mode, so we can read the button state
DDRB &= ~(1<<DDB6);
PORTB |= (1<<DDB6);
#endif
if (mcusr_state & (1<<EXTRF)) {
// External reset - we should continue to self-programming mode.
#if DEVICE_PID == 0x606C // Only on the BlinkyTape
} else if (!(PINB & (1<<DDB6))) {
// User button held low- Jump into the bootloader, in case the application is borked.
#endif
} else if ((mcusr_state & (1<<PORF)) && (pgm_read_word(0) != 0xFFFF)) {
// After a power-on reset skip the bootloader and jump straight to sketch
// if one exists.
StartSketch();
} else if ((mcusr_state & (1<<WDRF)) && (bootKeyPtrVal != bootKey) && (pgm_read_word(0) != 0xFFFF)) {
// If it looks like an "accidental" watchdog reset then start the sketch.
StartSketch();
}
/* Setup hardware required for the bootloader */
SetupHardware();
/* Enable global interrupts so that the USB stack can function */
sei();
Timeout = 0;
while (RunBootloader)
{
CDC_Task();
USB_USBTask();
/* Time out and start the sketch if one is present */
if (Timeout > TIMEOUT_PERIOD)
RunBootloader = false;
LEDPulse();
}
/* Disconnect from the host - USB interface will be reset later along with the AVR */
USB_Detach();
/* Jump to beginning of application space to run the sketch - do not reset */
StartSketch();
}
/** Main program entry point. This routine configures the hardware required by the bootloader, then continuously
* runs the bootloader processing routine until it times out or is instructed to exit.
*/
int main(void)
{
/* Save the value of the boot key memory before it is overwritten */
uint16_t bootKeyPtrVal = *bootKeyPtr;
*bootKeyPtr = 0;
/* Check the reason for the reset so we can act accordingly */
uint8_t mcusr_state = MCUSR; // store the initial state of the Status register
MCUSR = 0; // clear all reset flags
/* Watchdog may be configured with a 15 ms period so must disable it before going any further */
wdt_disable();
// init HWB pin, wait a ms to allow caps to charge
HWB_SETUP();
_delay_ms(1);
if ((mcusr_state & (1<<EXTRF)) && HWB_STATUS() && (pgm_read_word(0) != 0xFFFF)) {
// External reset - start the sketch if there is one and HWB jumper is not installed (HWB pin is read high)
StartSketch();
} else if ((mcusr_state & (1<<PORF)) && (pgm_read_word(0) != 0xFFFF)) {
// After a power-on reset skip the bootloader and jump straight to sketch
// if one exists.
StartSketch();
} else if ((mcusr_state & (1<<WDRF)) && (bootKeyPtrVal != bootKey) && (pgm_read_word(0) != 0xFFFF)) {
// If it looks like an "accidental" watchdog reset then start the sketch.
StartSketch();
}
// so only start programmimg mode when reset came from autoreset = watchdog reset and bootkey matches
/* Setup hardware required for the bootloader */
SetupHardware();
/* Enable global interrupts so that the USB stack can function */
sei();
Timeout = 0;
while (RunBootloader)
{
CDC_Task();
USB_USBTask();
/* Time out and start the sketch if one is present */
if (Timeout > TIMEOUT_PERIOD)
RunBootloader = false;
LEDPulse();
}
/* Disconnect from the host - USB interface will be reset later along with the AVR */
USB_Detach();
/* Jump to beginning of application space to run the sketch - do not reset */
StartSketch();
}
/** Main program entry point. This routine configures the hardware required by the bootloader, then continuously
* runs the bootloader processing routine until it times out or is instructed to exit.
*/
int main(void)
{
/* Save the value of the boot key memory before it is overwritten */
uint16_t bootKeyPtrVal = *bootKeyPtr;
*bootKeyPtr = 0;
/* Check the reason for the reset so we can act accordingly */
uint8_t mcusr_state = MCUSR; // store the initial state of the Status register
MCUSR = 0; // clear all reset flags
/* Watchdog may be configured with a 15 ms period so must disable it before going any further */
wdt_disable();
/* Jump to bootloader only if correct key is present in eeprom */
if ((eeprom_read_word((uint16_t*)EEP_BOOTKEY_ADDR) != BOOTLOADER_BOOTKEY) && (eeprom_read_word((uint16_t*)EEP_BACKUP_BOOTKEY_ADDR) != BOOTLOADER_BOOTKEY))
{
StartSketch();
}
/* Setup hardware required for the bootloader */
SetupHardware();
/* Enable global interrupts so that the USB stack can function */
sei();
Timeout = 0;
while (RunBootloader)
{
CDC_Task();
USB_USBTask();
/* Time out and start the sketch if one is present */
if (Timeout > TIMEOUT_PERIOD)
RunBootloader = false;
LEDPulse();
}
/* Disconnect from the host - USB interface will be reset later along with the AVR */
USB_Detach();
/* Jump to beginning of application space to run the sketch - do not reset */
StartSketch();
}
/** Main program entry point. This routine configures the hardware required by the bootloader, then continuously
* runs the bootloader processing routine until it times out or is instructed to exit.
*/
int main(void)
{
/* Save the value of the boot key memory before it is overwritten */
uint16_t bootKeyPtrVal = *bootKeyPtr;
*bootKeyPtr = 0;
/* Check the reason for the reset so we can act accordingly */
uint8_t mcusr_state = MCUSR; // store the initial state of the Status register
MCUSR &= ~((1 << PORF) | (1 << EXTRF) | (1 << WDRF)); // clear reset flags that are used by the bootloader
/* Watchdog may be configured with a 15 ms period so must disable it before going any further */
wdt_disable();
if (pgm_read_word(0) != 0xFFFF)
{
// There is a sketch (otherwise, skip these checks and just run the bootloader).
if (mcusr_state & (1 << PORF))
{
// After power-on reset, clear BORF so sketch can tell it wasn't a brown-out reset,
// then start the sketch.
MCUSR &= ~(1 << BORF);
StartSketch();
}
else if (mcusr_state & (1 << EXTRF))
{
// External reset.
if (bootKeyPtrVal != bootKey)
{
// First reset button press. Set boot key for 750 ms so second reset button press
// can be detected, then start the sketch if there isn't another reset.
*bootKeyPtr = bootKey;
_delay_ms(750);
*bootKeyPtr = 0;
StartSketch();
}
else
{
// Second reset button press; boot key was already set. Fall through to bootloader.
}
}
else if ((mcusr_state & (1 << WDRF)) && (bootKeyPtrVal == bootKey))
{
// Watchdog reset triggered by sketch to start bootloader. Fall through.
}
else
{
// Reset happened for some other reason; start the sketch.
StartSketch();
}
}
// Clear remaining reset flags so the sketch doesn't see info about an old reset when it runs later.
MCUSR = 0;
/* Setup hardware required for the bootloader */
SetupHardware();
/* Enable global interrupts so that the USB stack can function */
sei();
Timeout = 0;
while (RunBootloader)
{
CDC_Task();
USB_USBTask();
/* Time out and start the sketch if one is present */
if (Timeout > TIMEOUT_PERIOD)
RunBootloader = false;
LEDPulse();
}
/* Disconnect from the host - USB interface will be reset later along with the AVR */
USB_Detach();
/* Jump to beginning of application space to run the sketch - do not reset */
StartSketch();
}
