35 lines
1.0 KiB
C
35 lines
1.0 KiB
C
/**
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* This header files includes all function for the LEDs WS2812B.
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* It uses assambler for the PWM-Protocol and is designed for
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* a 20 MHz external oscillator.
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*/
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#ifndef WS2812B_ATMEGA
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#define WS2812B_ATMEGA
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#define F_CPU 20000000UL
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#include <util/delay.h>
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#include <avr/io.h>
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#include <stdint.h>
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#define DATAPIN PORTC
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// https://github.com/cpldcpu/light_ws2812/blob/master/light_ws2812_AVR/Light_WS2812/light_ws2812.c
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#define w_nop1 __asm__("nop \n\t")
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#define w_nop2 __asm__("rjmp .+0 \n\t")
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#define w_nop4 w_nop2; w_nop2
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// f=20MHz -> T=0,05 µs
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#define wait6 w_nop2; w_nop4 // == 0.3 µs ~ 0.4 µs (+- 150ns) == [0.25, 0.55] µs
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#define wait8 w_nop4; w_nop4 // == 0.4 µs ~ 0.45µs (+- 150ns) == [0.30, 0.60] µs
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#define wait14 wait8; wait6 // == 0.7 µs ~ 0.8 µs (+- 150ns) == [0.65, 0.95] µs
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#define wait15 wait14; w_nop1 // == 0.75 µs ~ 0.85µs (+- 150ns) == [0.70, 1.00] µs
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#define waitRES _delay_us(51) // > 50 µs
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void writeZero(void);
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void writeOne(void);
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void writeRGB(uint8_t r, uint8_t g, uint8_t b);
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#endif
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