31 lines
1.0 KiB
C
31 lines
1.0 KiB
C
/* Cylon Eyes */
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// ------- Preamble -------- //
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#include <avr/io.h> /* Defines pins, ports, etc */
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#include <util/delay.h> /* Functions to waste time */
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#define DELAYTIME 45 /* milliseconds */
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#define LED_PORT PORTB
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#define LED_PIN PINB
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#define LED_DDR DDRB
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int main(void) {
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// -------- Inits --------- //
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uint16_t x = 0x1234;
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uint8_t y;
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LED_DDR = 0xff; /* Data Direction Register B:
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all set up for output */
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// ------ Event loop ------ //
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while (1) {
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x = 2053 * x + 13849; /* "random" number generator */
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y = (x >> 8) & 0b00000111; /* pick three bits from high byte */
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LED_PORT ^= (1 << y); /* toggle one bit */
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_delay_ms(100);
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} /* End event loop */
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return 0;
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}
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