60 lines
1.2 KiB
C
60 lines
1.2 KiB
C
|
#include "bootloader.h"
|
||
|
|
#include "dev/watchdog.h"
|
||
|
|
#include <util/delay.h>
|
||
|
|
#include <avr/wdt.h>
|
||
|
|
#include "dev/usb/usb_drv.h"
|
||
|
|
|
||
|
|
volatile uint32_t Boot_Key ATTR_NO_INIT;
|
||
|
|
|
||
|
|
bool
|
||
|
|
bootloader_is_present(void) {
|
||
|
|
return pgm_read_word_far(BOOTLOADER_START_ADDRESS)!=0xFFFF;
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
Jump_To_Bootloader(void)
|
||
|
|
{
|
||
|
|
uint8_t i;
|
||
|
|
|
||
|
|
#ifdef UDCON
|
||
|
|
// If USB is used, detach from the bus
|
||
|
|
Usb_detach();
|
||
|
|
#endif
|
||
|
|
|
||
|
|
// Disable all interrupts
|
||
|
|
cli();
|
||
|
|
|
||
|
|
// Set the bootloader key to the magic value and force a reset
|
||
|
|
Boot_Key = MAGIC_BOOT_KEY;
|
||
|
|
|
||
|
|
// Wait two seconds for the USB detachment to register on the host
|
||
|
|
for (i = 0; i < 128; i++)
|
||
|
|
_delay_ms(16);
|
||
|
|
|
||
|
|
// Set the bootloader key to the magic value and force a reset
|
||
|
|
Boot_Key = MAGIC_BOOT_KEY;
|
||
|
|
|
||
|
|
watchdog_reboot();
|
||
|
|
}
|
||
|
|
|
||
|
|
extern void Bootloader_Jump_Check(void) ATTR_INIT_SECTION(3);
|
||
|
|
|
||
|
|
void
|
||
|
|
Bootloader_Jump_Check(void)
|
||
|
|
{
|
||
|
|
// If the reset source was the bootloader and the key is correct, clear it and jump to the bootloader
|
||
|
|
if(MCUSR & (1<<WDRF)) {
|
||
|
|
MCUSR = 0;
|
||
|
|
if(Boot_Key == MAGIC_BOOT_KEY) {
|
||
|
|
Boot_Key = 0;
|
||
|
|
wdt_disable();
|
||
|
|
|
||
|
|
((void (*)(void))BOOTLOADER_START_ADDRESS)();
|
||
|
|
} else {
|
||
|
|
Boot_Key++;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
Boot_Key = MAGIC_BOOT_KEY-4;
|
||
|
|
}
|
||
|
|
}
|