71 lines
2.4 KiB
C
71 lines
2.4 KiB
C
/*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "quantum/color.h"
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/*
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* The WS2812 datasheets define T1H 900ns, T0H 350ns, T1L 350ns, T0L 900ns. Hence, by default, these
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* are chosen to be conservative and avoid problems rather than for maximum throughput; in the code,
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* this is done by default using a WS2812_TIMING parameter that accounts for the whole window (1250ns)
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* and defining T1H and T0H; T1L and T0L are obtained by subtracting their low counterparts from the window.
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*
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* However, there are certain "WS2812"-like LEDs, like the SK6812s, which work in a similar
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* communication topology but use different timings for the window and the T1L, T1H, T0L and T0H.
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* This means that, albeit the same driver being applicable, the timings must be adapted.
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*/
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#ifndef WS2812_TIMING
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# define WS2812_TIMING 1250
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#endif
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#ifndef WS2812_T1H
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# define WS2812_T1H 900 // Width of a 1 bit in ns
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#endif
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#ifndef WS2812_T1L
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# define WS2812_T1L (WS2812_TIMING - WS2812_T1H) // Width of a 1 bit in ns
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#endif
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#ifndef WS2812_T0H
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# define WS2812_T0H 350 // Width of a 0 bit in ns
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#endif
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#ifndef WS2812_T0L
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# define WS2812_T0L (WS2812_TIMING - WS2812_T0H) // Width of a 0 bit in ns
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#endif
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/*
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* Older WS2812s can handle a reset time (TRST) of 50us, but recent
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* component revisions require a minimum of 280us.
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*/
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#if !defined(WS2812_TRST_US)
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# define WS2812_TRST_US 280
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#endif
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/* User Interface
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*
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* Input:
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* ledarray: An array of GRB data describing the LED colors
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* number_of_leds: The number of LEDs to write
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*
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* The functions will perform the following actions:
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* - Set the data-out pin as output
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* - Send out the LED data
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* - Wait 50us to reset the LEDs
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*/
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void ws2812_setleds(LED_TYPE *ledarray, uint16_t number_of_leds);
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