blob: aa64d5dd68b76ceb506bb0f7a425f32cd0c438ac [file] [log] [blame]
#
# Copyright (c) 2017 Linaro Limited
#
# SPDX-License-Identifier: Apache-2.0
#
# The following blog post is an excellent resource about pulse timing:
#
# https://wp.josh.com/2014/05/13/ws2812-neopixels-are-not-so-finicky-once-you-get-to-know-them/
menuconfig WS2812_STRIP
bool "Enable WS2812 (and compatible) LED strip driver"
depends on SPI
help
Enable LED strip driver for daisy chains of WS2812-ish
(or WS2812B, WS2813, SK6812, or compatible) devices.
These devices have a one-wire communications interface
which encodes bits using pulses. Short pulses indicate
zero bits, and long pulses indicate ones; refer to the
chip datasheets for precise specifications. To implement
this in a multitasking operating system, this driver
generates the pulses using a SPI peripheral.
if WS2812_STRIP
config WS2812_STRIP_MAX_PIXELS
int "Maximum number of pixels in a strip"
default 12
help
Set this to the maximum number of pixels you need
to control at once. There is an 8x memory penalty associated
with each increment of this value, so it's worth optimizing.
config WS2812_STRIP_ONE_FRAME
hex "SPI frame to shift out to signal a one bit"
default 0x7c if SOC_SERIES_STM32F4X
default 0x70 if SOC_FAMILY_NRF
help
When shifted out at the configured clock frequency,
this must generate a pulse whose width fits within the chipset
specifications for T1H, and whose interpulse timing meets low
times. It is recommended that the first and last bits in the
frame be zero; this "encourages" SPI IPs to leave MOSI low
between frames.
config WS2812_STRIP_ZERO_FRAME
hex "SPI frame to shift out to signal a zero bit"
default 0x60 if SOC_SERIES_STM32F4X
default 0x40 if SOC_FAMILY_NRF
help
When shifted out at the configured clock frequency,
this must generate a pulse whose width fits within the chipset
specifications for T0H, and whose interpulse timing meets low
times. It is recommended that the first and last bits in the
frame be zero; this "encourages" SPI IPs to leave MOSI low
between frames.
# By default, we use GRBW [sic] (and ignore W).
comment "The following options determine channel data order on the wire."
config WS2812_RED_ORDER
int "Order in which a red pixel should be shifted out"
default 1
range 0 3
help
If the red channel is shifted out first, specify 0.
If second, specify 1, and so on.
config WS2812_GRN_ORDER
int "Order in which a green pixel should be shifted out"
default 0
range 0 3
help
If the green channel is shifted out first, specify 0.
If second, specify 1, and so on.
config WS2812_BLU_ORDER
int "Order in which a blue pixel should be shifted out"
default 2
range 0 3
help
If the blue channel is shifted out first, specify 0.
If second, specify 1, and so on.
config WS2812_HAS_WHITE_CHANNEL
bool "Does the chip have a white channel on wire?"
default y
help
If the chipset has a white channel, say y. White channels
are not used by the driver, but must be declared if expected
by the chip.
config WS2812_WHT_ORDER
int "Order in which a white pixel should be shifted out"
default 3
range 0 3
depends on WS2812_HAS_WHITE_CHANNEL
help
If the blue channel is shifted out first, specify 0.
If second, specify 1, and so on.
endif # WS2812_STRIP