63 lines
2.0 KiB
C
63 lines
2.0 KiB
C
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/*
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www.electropepper.org
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Beerright 2017.
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*/
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#include "main.h"
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#define diceDelay 100 // LED speed change while shuffling
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#define toggleDelay 300 // LED speed when stoped
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#define none 0
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int main(int argc, char **argv)
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{
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GIMSK |= _BV(PCIE); // Enable pin change interrupt
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PCMSK |= _BV(PB4); // Enable PORTB4 for pin change interrupt
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sei(); // Enable global interrupts
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DDRB &= ~_BV(PB4); // Set PORTB4 to input
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set_sleep_mode(SLEEP_MODE_PWR_DOWN); // Set sleep mode for Power-down(see datasheet)
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uint8_t randSeed = eeprom_read_byte ((uint8_t*)1); // Reads eeprom byte 1, value
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// into variable randSeed
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++randSeed; // Increments it
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eeprom_write_byte ((uint8_t*)1, randSeed); // Writes value back into
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// eeprom byte 1
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srand (randSeed); // Creates seed for random number
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// generator from randSeed value
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while (1) {
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for (stand_cycle = 0; stand_cycle < 40; stand_cycle++){ // Repeats 40 times next 4 lines
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what_led(cur_led); // Turn ON LED number inside variable cur_led
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_delay_ms(toggleDelay); // Wait
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what_led(none); // Truen off all LED's
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_delay_ms(toggleDelay); // Wait
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}
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sleep_mode(); // Go into sleep mode to save power, will came back alive
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// after interrupt is generated
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}
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}
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ISR(PCINT0_vect) // Interrupt routine on pin change
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{
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for (uint8_t i = 0; i < 25; i++){ // Repeats 25 times next 3 lines
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cur_led = ((rand() % 7) + 1); // Creates random integer from 0 to 6 into cur_led
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what_led(cur_led); // Turn ON LED number inside variable cur_led
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_delay_ms(diceDelay); // Wait
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}
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stand_cycle = 0; // Resets the standby blinking times
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}
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void what_led(uint8_t led)
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{
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int8_t ledN = led_table[led]; // Reads led_table given number(led) into ledN
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DDRB = ledN & 0x0F; // Copy first ledN nibble into DDRB
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ledN = (ledN & 0xF0) >> 4; // Move second nibble into first nibble
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PORTB = ledN & 0x0F; // Copy first ledN nibble into PORTB
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}
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