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WS2812_SCAN - Exercise a WS2812 LED with different timing parameters. For each set of timing parameters (j,k) the following is performed: - Wait 10µs to reset the WS2812 LED - Emit 48 pulses with the given timing Compiles with AVR-GCC for ATtiny85. LED is connected on PB1.
/*
* WS2812_SCAN.c
*
* Created: 10.01.2014 20:46:20
* Author: tim
*/
#include <avr/io.h>
int main(void)
{
CLKPR=_BV(CLKPCE); // CLKDIV=1
CLKPR=0;
DDRB|=_BV(PB1); // Enable 0C0B/PB1
PORTB&=~_BV(PB1); // Set GPIO to low for the reset phase
TCCR0A=0; // PWM output off
TCCR0B=_BV(WGM02)|_BV(CS00);
while(1) {
uint8_t i;
int j,k;
_delay_ms(1); // delay before start of sequence
for(k=4; k<64; k++) {
for (j=0; j<k ;j++) {
_delay_us(10); // Reset
{
OCR0A=k; // Total pulse length in clockcycles
OCR0B=j; // "On" time in clockcycles
TCNT0=0;
TCCR0A=_BV(COM0B1)|_BV(WGM01)|_BV(WGM00);
TIFR|=_BV(OCF0A);
for (i=0; i<48; i++) { // Emit 48 pulses
while (!(TIFR&_BV(OCF0A)));
TIFR|=_BV(OCF0A);
}
TCCR0A=0;
}
}
}
}
}
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