sergiotarxz/nuttx
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

drivers/leds/ws2812: fix code style

Browse Source 
As reported by the CI checks.
This commit is contained in:
Diego Herranz 2020-12-07 09:29:43 +00:00 committed by Brennan Ashton
parent 441180b08c
commit 3edb3a47b2
1 changed files with 6 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/leds/ws2812.c
View File

@ -41,23 +41,22 @@
/* In order to meet the signaling timing requirements, the waveforms required
* to represent a 0/1 symbol are created by specific SPI bytes defined here.
*
*
* Only two target frequencies: 4 MHz and 8 MHz. However, given the tolerance
* allowed in the WS2812 timing specs, two ranges around those target
* frequencies can be used for better flexibility. Extreme frequencies rounded
* to the nearest multiple of 100 kHz which meets the specs. Try to avoid
* using the extreme frequencies.
*
* frequencies can be used for better flexibility. Extreme frequencies
* rounded to the nearest multiple of 100 kHz which meets the specs.
* Try to avoid using the extreme frequencies.
*
* If using an LED different to the WS2812 (e.g. WS2812B) check its timing
* specs, which may vary slightly, to decide which frequency is safe to use.
*
*
* WS2812 specs:
* T0H range: 200ns - 500ns
* T1H range: 550ns - 850ns
* Reset: low signal >50us
*/
#if CONFIG_WS2812_FREQUENCY >= 3600000 && CONFIG_WS2812_FREQUENCY <= 5000000
# define WS2812_ZERO_BYTE 0b01000000 /* 200ns at 5 MHz, 278ns at 3.6 MHz */
# define WS2812_ONE_BYTE 0b01110000 /* 600ns at 5 MHz, 833ns at 3.6 MHz */