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neopixel: Add comments on timing

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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
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11
src/neopixel.c
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@ -1,6 +1,6 @@
// 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.
@ -74,8 +74,11 @@ neopixel_delay(neopixel_time_t start, neopixel_time_t ticks)
#endif
// Minimum amount of time for a '1 bit' to be reliably detected
#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)
@ -147,14 +150,14 @@ send_data(struct neopixel_s *n)
gpio_out_toggle_noirq(pin);
irq_enable();
neopixel_delay(neopixel_get_time(), PULSE_SHORT_TICKS);
neopixel_delay(neopixel_get_time(), EDGE_MIN_TICKS);
} else {
// Short pulse
neopixel_delay(last_start, BIT_MIN_TICKS);
irq_disable();
neopixel_time_t start = neopixel_get_time();
gpio_out_toggle_noirq(pin);
neopixel_delay(start, PULSE_SHORT_TICKS);
neopixel_delay(start, EDGE_MIN_TICKS);
gpio_out_toggle_noirq(pin);
irq_enable();