WS2801 LED strip
-------------------------------------------------------------------------------
-This is a capture of data output an LED universes of 50 RGB LEDS.
+This is a capture of data output to a LED universe of 50 RGB LEDs.
-Every universe at full capacity of has a frame size of 768 bytes and can clock
+Every universe at full capacity has a frame size of 768 bytes and can clock
out at roughly 100 frames per second.
Details:
- Koen Kooi's evil vendor tree: https://github.com/koenkooi/kernel
- - PRU WS2801 firmware: https://github.com/mranostay/ws28xx-lighting-pru
+ - PRU WS28xx firmware: https://github.com/mranostay/ws28xx-lighting-pru
- WS2801 datasheet: http://www.adafruit.com/datasheets/WS2801.pdf
-WS2812B protocol overview
--------------------------
+WS2801 protocol overview
+------------------------
-Each LED receives and the stores the first 24-bits of RGB ordered data then
+Each LED receives and then stores the first 24-bits of RGB ordered data then
passes any more out the Data Output pin to the next LED in the chain.
-There is no CS line but latching is done when CLK is held low for >500 uS
+There is no CS line but latching is done when CLK is held low for >500 uS.
-This functions as a "reverse" shift register and allows the strip length not to
-be defined in the protocol.
+This functions as a "reverse" shift register and allows the strip length not
+to be defined in the protocol.
Logic analyzer setup
--------------------
-The logic analzyer used was a Saleae Logic16 (at 5mhz)
+The logic analyzer used was a Saleae Logic16 (at 5MHz):
- Probe WS2812B LED strip
- -------------------------
+ Probe WS2801 LED strip
+ ----------------------------
1 (black) Universe #1
2 (brown) Clock
+
Data
----
sigrok-cli --driver saleae-logic16 --samples 10M --config samplerate=5mhz \
-p 0=UNI1,1=CLK -o ws2801_2ch_5mhz.sr
+
projects / sigrok-dumps.git / blobdiff