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78 lines
2.1 KiB
78 lines
2.1 KiB
10 years ago
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#pragma once
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/**
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Utils for driving a WS2812 (WS2812B) RGB LED strips.
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It's implemented as macros to avoid overhead when passing values, and to
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enable driving multiple strips at once. There is over 1us of free time between
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the colors, which can be used for some processing or color computation.
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To avoid bloating your code, try to reduce the nuýmber of invocations -
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compute color and then send it.
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*/
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#include <avr/io.h>
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#include "pins.h"
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#include "nsdelay.h"
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#include "colors.h"
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/* Driver code for WS2812B */
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// --- timing constraints (NS) ---
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#ifndef WS_T_1H
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# define WS_T_1H 700
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#endif
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#ifndef WS_T_1L
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# define WS_T_1L 150
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#endif
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#ifndef WS_T_0H
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# define WS_T_0H 150
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#endif
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#ifndef WS_T_0L
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# define WS_T_0L 700
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#endif
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#ifndef WS_T_LATCH
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# define WS_T_LATCH 7000
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#endif
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/** Wait long enough for the colors to show */
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#define ws_show() do { delay_ns_c(WS_T_LATCH, 0); } while(0)
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/** Send one byte to the RGB strip */
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#define ws_send_byte(io, bb) do { \
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for (volatile int8_t __wsba_i = 7; __wsba_i >= 0; --__wsba_i) { \
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if ((bb) & (1 << __wsba_i)) { \
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pin_high(io_pack(io)); delay_ns_c(WS_T_1H, -2); \
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pin_low(io_pack(io)); delay_ns_c(WS_T_1L, -10); \
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} else { \
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pin_high(io_pack(io)); delay_ns_c(WS_T_0H, -2); \
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pin_low(io_pack(io)); delay_ns_c(WS_T_0L, -10); \
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} \
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} \
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} while(0)
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/** Send R,G,B color to the strip */
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#define ws_send_rgb(io, r, g, b) do { \
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ws_send_byte(io_pack(io), g); \
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ws_send_byte(io_pack(io), r); \
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ws_send_byte(io_pack(io), b); \
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} while(0)
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/** Send a RGB struct */
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#define ws_send_xrgb(io, xrgb) ws_send_rgb(io_pack(io), (xrgb).r, (xrgb).g, (xrgb).b)
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/** Send color hex */
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#define ws_send_rgb24(io, rgb) ws_send_rgb(io_pack(io), rgb24_r(rgb), rgb24_g(rgb), rgb24_b(rgb))
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#define ws_send_rgb15(io, rgb) ws_send_rgb(io_pack(io), rgb15_r(rgb), rgb15_g(rgb), rgb15_b(rgb))
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#define ws_send_rgb12(io, rgb) ws_send_rgb(io_pack(io), rgb12_r(rgb), rgb12_g(rgb), rgb12_b(rgb))
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#define ws_send_rgb6(io, rgb) ws_send_rgb(io_pack(io), rgb6_r(rgb), rgb6_g(rgb), rgb6_b(rgb))
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