fpga/ws2812b-vhdl
1
0
Fork 0
mirror of https://github.com/cclassic/ws2812b-vhdl synced 2024-11-21 08:55:04 +01:00
Code Issues Releases Wiki Activity

Added doc for ws2812b_phy

Browse Source
This commit is contained in:
Markus Koch 2016-11-05 15:10:25 +01:00
parent bb76c45367
commit 6e5249641d
1 changed files with 40 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
README.MD
View File

@ -13,7 +13,45 @@ For directories containing VHDL source files, the directory name denotes the VHD
### ws2812b_phy ### ws2812b_phy
Low level driver for the WorldSemi WS2812B RGB LEDs. Handles bit timing and command separation. 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. For an example, see Rainbow.