drashna/qmk_firmware
1
0
Fork 0
Code Activity Actions

Tidy up adjustable ws2812 timing (#15299)

Browse source
This commit is contained in:
Joel Challis 2021-11-25 19:35:06 +00:00 • committed by GitHub
parent 3d00620711
commit 5e9c29da0d
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
6 changed files with 55 additions and 58 deletions
Download patch file Download diff file Expand all files Collapse all files

11
platforms/avr/drivers/ws2812.c
View file

@ -52,20 +52,15 @@ void ws2812_setleds(LED_TYPE *ledarray, uint16_t number_of_leds) {
using the fast 800kHz clockless WS2811/2812 protocol.
*/
// Timing in ns
#define w_zeropulse 350
#define w_onepulse 900
#define w_totalperiod 1250
// Fixed cycles used by the inner loop
#define w_fixedlow 2
#define w_fixedhigh 4
#define w_fixedtotal 8
// Insert NOPs to match the timing, if possible
#define w_zerocycles (((F_CPU / 1000) * w_zeropulse) / 1000000)
#define w_onecycles (((F_CPU / 1000) * w_onepulse + 500000) / 1000000)
#define w_totalcycles (((F_CPU / 1000) * w_totalperiod + 500000) / 1000000)
#define w_zerocycles (((F_CPU / 1000) * WS2812_T0H) / 1000000)
#define w_onecycles (((F_CPU / 1000) * WS2812_T1H + 500000) / 1000000)
#define w_totalcycles (((F_CPU / 1000) * WS2812_TIMING + 500000) / 1000000)
// w1_nops - nops between rising edge and falling edge - low
#if w_zerocycles >= w_fixedlow