worldsemi,ws2812-bflb-wo

Description

WS2812 and similar on BFLB GPIO FIFO / WO

Use the Bouffalolab GPIO FIFO / Wire Out to drive addressable RGB leds by producing
specifications-accurate pulse widths bits.

Properties

Properties not inherited from the base binding file.

Name

Type

Details

time-t0h

int

 
How long the output signal has to stay high to signify a 0 bit.
The default is the time for WS2812B (0.4us +/- 150ns).

Default value: 400

time-t1h

int

 
How long the output signal has to stay high to signify a 1 bit.
The default is the time for WS2812B (0.8us +/- 150ns).

Default value: 800

time-total

int

 
How long a bit, a pulse containing a high and a low part, should be.
The default is the time for WS2812B (1.25us +/- 600ns).

Default value: 1250

frequency

int

 
Frequency at which the bits are sent. This or time-total must be defined.

gpios

phandle-array

 
GPIO phandle and specifier for the pin connected to the
led-strip. Exactly one pin should be given.

This property is required.

reset-delay

int

 
Minimum delay to wait (in microseconds) to make sure that the strip has
latched the signal. If omitted, a default value of 8 microseconds is used.
This default is good for the WS2812 controllers. Note that despite the
WS2812 datasheet states that a 50 microseconds delay is required, it seems
6 microseconds is enough. The default is set to 8 microseconds just to be
safe.

Default value: 8

chain-length

int

 
The number of devices in the daisy-chain.

This property is required.

color-mapping

array

 
Channel to color mapping (or pixel order).

For example a GRB channel to color mapping would be

   color-mapping = <LED_COLOR_ID_GREEN
                    LED_COLOR_ID_RED
                    LED_COLOR_ID_BLUE>;

This property is required.