andreil/klipper
1
0
Fork 0
mirror of https://github.com/andreili/klipper.git synced 2025-08-24 03:44:06 +02:00
Code Issues Packages Projects Releases Wiki Activity

neopixel: Add comments on timing

Browse Source 
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2025-04-17 13:06:22 -04:00
parent 4e7fcc2704
commit 413ff19ea8
1 changed files with 7 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
src/neopixel.c
View File

@ -1,6 +1,6 @@
// Support for bit-banging commands to WS2812 type "neopixel" LEDs // Support for bit-banging commands to WS2812 type "neopixel" LEDs
// //
// Copyright (C) 2019 Kevin O'Connor <kevin@koconnor.net> // Copyright (C) 2019-2025 Kevin O'Connor <kevin@koconnor.net>
// //
// This file may be distributed under the terms of the GNU GPLv3 license. // This file may be distributed under the terms of the GNU GPLv3 license.
@ -74,8 +74,11 @@ neopixel_delay(neopixel_time_t start, neopixel_time_t ticks)
#endif #endif
// Minimum amount of time for a '1 bit' to be reliably detected
#define PULSE_LONG_TICKS nsecs_to_ticks(650) #define PULSE_LONG_TICKS nsecs_to_ticks(650)
#define PULSE_SHORT_TICKS nsecs_to_ticks(200) // Minimum amount of time for any level change to be reliably detected
#define EDGE_MIN_TICKS nsecs_to_ticks(200)
// Minimum average time needed to transmit each bit (two level changes)
#define BIT_MIN_TICKS nsecs_to_ticks(1250) #define BIT_MIN_TICKS nsecs_to_ticks(1250)
@ -147,14 +150,14 @@ send_data(struct neopixel_s *n)
gpio_out_toggle_noirq(pin); gpio_out_toggle_noirq(pin);
irq_enable(); irq_enable();
neopixel_delay(neopixel_get_time(), PULSE_SHORT_TICKS); neopixel_delay(neopixel_get_time(), EDGE_MIN_TICKS);
} else { } else {
// Short pulse // Short pulse
neopixel_delay(last_start, BIT_MIN_TICKS); neopixel_delay(last_start, BIT_MIN_TICKS);
irq_disable(); irq_disable();
neopixel_time_t start = neopixel_get_time(); neopixel_time_t start = neopixel_get_time();
gpio_out_toggle_noirq(pin); gpio_out_toggle_noirq(pin);
neopixel_delay(start, PULSE_SHORT_TICKS); neopixel_delay(start, EDGE_MIN_TICKS);
gpio_out_toggle_noirq(pin); gpio_out_toggle_noirq(pin);
irq_enable(); irq_enable();