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Added doc for ws2812b_phy

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Markus Koch 2016-11-05 15:10:25 +01:00
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README.MD
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@ -13,7 +13,45 @@ For directories containing VHDL source files, the directory name denotes the VHD
### ws2812b_phy
Low level driver for the WorldSemi WS2812B RGB LEDs. Handles bit timing and command separation.
*Documentation coming soon*
<pre>
+ +
| |
| |
+-----------+ +----------------------v----v------+
| +----> pixData_red[7:0] clk rst |
| | | |
| +----> pixData_green[7:0] |
| | | | +----+
| User +----> pixData_blue[7:0] so +---->LEDs|
| Logic | | | +----+
| | | |
| +----> pixData_valid |
| | | |
| <----+ pixData_next |
+-----------+ +----------------------------------+
_ _ _ _ _ _ _ _ _ _ _ _ _ _
clk _/ \_/ \_/ \_/ \_/ \_/ \_ / / \_/ \_/ \_/ \_ / / \_/ \_/ \_/ \_
_______ _______ / / _______ / /
data ---------<_______X_______ | | _______>------- | | ----------------
_______________ \ \ _______ \ \
valid _________/ \ \ \_______ \ \ ________________
___ | | ___ | | ___
next _____________/ \_______ / / ___/ \_______ / / ____/ \_______
/ / / /
1 2 3 4 5 6
1: User applies first LED's data and asserts pixData_valid.
2: PHY acknowledges that it latched the data and starts supplying the
information to the LED string.
3: User logic sees the pixData_next strobe and prepares the next data.
4: Next data is latched. Steps 3 and 4 are to be repeated until each LED in
the string has been given a value.
5: User logic sees the pixData_next strobe. As all LEDs have already been
given a value, pixData_valid is deasserted to signal the end of a string.
6: The completion of the reset time is signalled using another
pixData_next strobe.
</pre>
For an example, see Rainbow.
@ -40,4 +78,4 @@ Make sure the `F_CLK` is set to the actual frequency present on the hardware for
## License
This work is released under the Mozilla Public License (MPL) Version 2. It may be interpreted in the same way the Open Hardware Description License (OHDL) by Julius Baxter does. Read more about it here: http://juliusbaxter.net/ohdl/ohdl.txt
Authors: Markus Koch <markus@notsyncing.net>
Authors: Markus Koch <markus@notsyncing.net>