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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1144 | - | 1 | // Martin Thomas 4/2008 |
| 2 | |||
| 3 | #include <avr/io.h> |
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| 4 | #include <avr/interrupt.h> |
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| 5 | #include <avr/wdt.h> |
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| 6 | #include <util/delay.h> |
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| 7 | |||
| 8 | #define LED_PORT PORTB |
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| 9 | #define LED_DDR DDRB |
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| 10 | #define LED_BIT PB2 |
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| 11 | |||
| 12 | #define BT_PORT PORTC |
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| 13 | #define BT_DDR DDRC |
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| 14 | #define BT_PIN PINC |
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| 15 | #define BT_BIT PC7 |
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| 16 | |||
| 17 | static inline void my_wdt_off(void) |
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| 18 | { |
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| 19 | cli(); |
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| 20 | wdt_reset(); |
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| 21 | /* Clear WDRF in MCUSR */ |
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| 22 | MCUSR &= ~(1<<WDRF); |
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| 23 | /* Write logical one to WDCE and WDE */ |
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| 24 | /* Keep old prescaler setting to prevent unintentional time-out */ |
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| 25 | WDTCSR |= (1<<WDCE) | (1<<WDE); |
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| 26 | /* Turn off WDT */ |
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| 27 | WDTCSR = 0x00; |
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| 28 | } |
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| 29 | |||
| 30 | static void my_delay( void ) |
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| 31 | { |
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| 32 | int i; |
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| 33 | for ( i=0; i<500; i++ ) { |
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| 34 | _delay_ms(1); |
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| 35 | } |
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| 36 | } |
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| 37 | |||
| 38 | int main( void ) |
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| 39 | { |
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| 40 | my_wdt_off(); |
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| 41 | |||
| 42 | LED_PORT |= ( 1<<LED_BIT ); |
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| 43 | LED_DDR |= ( 1<<LED_BIT ); |
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| 44 | |||
| 45 | BT_DDR &= ~( 1<<BT_BIT ); |
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| 46 | BT_PORT |= ( 1<<BT_BIT ); |
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| 47 | |||
| 48 | while ( 1 ) { |
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| 49 | LED_PORT &= ~( 1<<LED_BIT ); |
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| 50 | my_delay(); |
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| 51 | LED_PORT |= ( 1<<LED_BIT ); |
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| 52 | my_delay(); |
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| 53 | |||
| 54 | if ( !( BT_PIN & ( 1<<BT_BIT ) ) ) { |
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| 55 | /* start bootloader */ |
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| 56 | wdt_enable( WDTO_250MS ); |
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| 57 | while (1) { ; } |
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| 58 | } |
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| 59 | } |
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| 60 | |||
| 61 | return 0; /* never reached */ |
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| 62 | } |