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drivers/ws281x: improve timing for ESP32x #19422

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merged 1 commit into from
Mar 25, 2023
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drivers/ws281x: improve timing for ESP32x #19422

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11 changes: 8 additions & 3 deletions drivers/ws281x/esp32.c
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Original file line number Diff line number Diff line change
Expand Up @@ -70,18 +70,23 @@ void ws281x_write_buffer(ws281x_t *dev, const void *buf, size_t size)
on_wait = zero_on;
off_wait = zero_off;
}
data <<= 1;
while (cpu_hal_get_cycle_count() < current_wait) { }
/* end of LOW phase and start of HIGH phase */
start = cpu_hal_get_cycle_count();
gpio_set(dev->params.pin);
current_wait = start + on_wait;
while (cpu_hal_get_cycle_count() < current_wait) { }
gpio_clear(dev->params.pin);
/* end of HIGH phase and start of HIGH phase */
start = cpu_hal_get_cycle_count();
gpio_clear(dev->params.pin);
current_wait = start + off_wait;
while (cpu_hal_get_cycle_count() < current_wait) { }
data <<= 1;
}
pos++;
}
/* final LOW phase */
current_wait = cpu_hal_get_cycle_count();
/* end of final LOW phase */
}

int ws281x_init(ws281x_t *dev, const ws281x_params_t *params)
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