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58d040ff2f
This patch adds a devicetree configuration example for the Everlight B1414 LED controller. An overlay for the nucleo_f070rb board is provided. It assumes that a B1414 LED controller is connected to the PA7 pin (SPI 1 MOSI). The WS2812 SPI driver is used. Signed-off-by: Simon Guinot <simon.guinot@seagate.com>
27 lines
638 B
C
27 lines
638 B
C
/*
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* Copyright (c) 2021 Seagate Technology LLC
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_SAMPLES_DRIVERS_LED_WS2812_F070RB_BINDINGS_H
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#define ZEPHYR_SAMPLES_DRIVERS_LED_WS2812_F070RB_BINDINGS_H
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/*
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* Everlight B1414 LED controller;
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*
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* Each bit of the control signal (waveform) is described with a 1.2 us pulse:
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* 0 bit: 300 ns high and 900 ns low.
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* 1 bit: 900 ns high and 300 ns low.
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*
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* At 6 MHz, one bit represents 166.666 ns.
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* 1200 ns -> 7.2 bits
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* 300 ns -> 1.8 bits
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* 900 ns -> 5.4 bits
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*/
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#define B1414_SPI_FREQ 6000000
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#define B1414_ZERO_FRAME 0x60
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#define B1414_ONE_FRAME 0x7C
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#endif
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