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port to atmega644 and reconfigure watchdog

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This commit is contained in:
David Voswinkel
2009-07-20 23:12:01 +02:00
parent 8bee3f786f
commit 9e1a9fffc5
3 changed files with 46 additions and 28 deletions
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53
avr/bootloader/bootloader.c
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@@ -64,8 +64,8 @@
(LED_DIR &=~ (1 << LED_PIN))); }
#define DLED_OFF {((LED_PORT &=~ (1 << LED_PIN)),\
(LED_DIR |= (1 << LED_PIN))); }
#define DLED_TGL {((LED_PORT ^= (1 << LED_PIN)),\
(LED_DIR |= (1 << LED_PIN)));}
#define DLED_TGL {((LED_PORT &=~ (1 << LED_PIN)),\
(LED_DIR ^= (1 << LED_PIN)));}
@@ -318,8 +318,8 @@ void leave_bootloader(void)
/* disconnect usb */
usbDeviceDisconnect();
for (uint8_t i = 0; i < 38; i++)
_delay_loop_2(0); /* 0 means 0x10000, 38*1/f*0x10000 =~ 498ms */
for (uint8_t i = 0; i < 50; i++)
_delay_ms(10); /* 0 means 0x10000, 38*1/f*0x10000 =~ 498ms */
/* enable watchdog to soft-reset the uC for clean startup of new application */
wdt_enable(WDTO_15MS);
@@ -334,36 +334,46 @@ int __attribute__ ((noreturn,OS_main)) main(void)
{
/* start bootloader */
/* init LED-Pin */
PORTB = 0;
#ifdef DEBUG_UART
/* init uart (115200 baud, at 20mhz) */
UBRR0L = 10;
UCSR0C = _BV(UCSZ00) | _BV(UCSZ01);
UCSR0B = _BV(TXEN0);
putc('b');
#endif
putc('a');
wdt_disable();
uint8_t reset = MCUSR;
reset=0;
uint16_t delay =0;
timeout = TIMEOUT;
/* if power-on reset, quit bootloader via watchdog reset */
if (reset & _BV(PORF)){
putc('p');
MCUSR = 0;
leave_bootloader();
}
/* if watchdog reset, disable watchdog and jump to app */
else if(reset & _BV(WDRF)){
MCUSR = 0;
//WDTCSR |= (1<<WDCE);
//WDTCSR &= ~((1<<WDIE) | (1<<WDE));
wdt_disable();
putc('r');
while(1);
jump_to_app();
}
while(1);
/* else: enter programming mode */
putc('u');
/* clear external reset flags */
MCUSR = 0;
@@ -372,40 +382,45 @@ int __attribute__ ((noreturn,OS_main)) main(void)
request_exit = 0;
/* move interrupts to boot section */
MCUCR = (1 << IVCE);
MCUCR = (1 << IVSEL);
/* enable interrupts */
sei();
cli();
/* initialize usb pins */
usbInit();
/* disconnect for ~500ms, so that the host re-enumerates this device */
putc('d');
usbDeviceDisconnect();
for (uint8_t i = 0; i < 38; i++)
_delay_loop_2(0); /* 0 means 0x10000, 38*1/f*0x10000 =~ 498ms */
for (uint8_t i = 0; i < 50; i++)
_delay_ms(10); /* 0 means 0x10000, 38*1/f*0x10000 =~ 498ms */
usbDeviceConnect();
uint16_t delay;
timeout = TIMEOUT;
putc('c');
/* enable interrupts */
sei();
while(1) {
//wdt_reset();
usbPoll();
delay++;
/* do some led blinking, so that it is visible that the bootloader is still running */
if (delay == 0) {
putc('p');
DLED_TGL;
if (timeout < 255)
timeout--;
}
if (request_exit || timeout == 0) {
_delay_loop_2(0);
putc('e');
_delay_ms(10);
leave_bootloader();
}
}
putc('l');
leave_bootloader();
}