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__init__.c
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// This file is part of the CircuitPython project: https://circuitpython.org
//
// SPDX-FileCopyrightText: Copyright (c) 2016 Scott Shawcroft for Adafruit Industries
//
// SPDX-License-Identifier: MIT
#include "shared-bindings/neopixel_write/__init__.h"
#include "py/obj.h"
#include "py/mphal.h"
#include "py/runtime.h"
#include "shared-bindings/digitalio/DigitalInOut.h"
#include "shared-bindings/util.h"
// RGB LED timing information:
// From the WS2811 datasheet: high speed mode
// - T0H 0 code,high voltage time 0.25 us +-150ns
// - T1H 1 code,high voltage time 0.6 us +-150ns
// - T0L 0 code,low voltage time 1.0 us +-150ns
// - T1L 1 code,low voltage time 0.65 us +-150ns
// - RES low voltage time Above 50us
// From the SK6812 datasheet:
// - T0H 0 code, high level time 0.3us +-0.15us
// - T1H 1 code, high level time 0.6us +-0.15us
// - T0L 0 code, low level time 0.9us +-0.15us
// - T1L 1 code, low level time 0.6us +-0.15us
// - Trst Reset code，low level time 80us
// From the WS2812 datasheet:
// - T0H 0 code, high voltage time 0.35us +-150ns
// - T1H 1 code, high voltage time 0.7us +-150ns
// - T0L 0 code, low voltage time 0.8us +-150ns
// - T1L 1 code, low voltage time 0.6us +-150ns
// - RES low voltage time Above 50us
// From the WS28212B datasheet:
// - T0H 0 code, high voltage time 0.4us +-150ns
// - T1H 1 code, high voltage time 0.8us +-150ns
// - T0L 0 code, low voltage time 0.85us +-150ns
// - T1L 1 code, low voltage time 0.45us +-150ns
// - RES low voltage time Above 50us
// The timings used in various ports do not always follow the guidelines above.
// In general, a zero bit is about 300ns high, 900ns low.
// A one bit is about 700ns high, 500ns low.
// But the ports vary based on implementation considerations; the proof is in the testing.
// https://adafru.it/5225 is more sensitive to timing and should be included in testing.
static void check_for_deinit(digitalio_digitalinout_obj_t *self) {
if (common_hal_digitalio_digitalinout_deinited(self)) {
raise_deinited_error();
}
}
//| """Low-level neopixel implementation
//|
//| The `neopixel_write` module contains a helper method to write out bytes in
//| the 800khz neopixel protocol.
//|
//| For example, to turn off a single neopixel (like the status pixel on Express
//| boards.)
//|
//| .. code-block:: python
//|
//| import board
//| import neopixel_write
//| import digitalio
//|
//| pin = digitalio.DigitalInOut(board.NEOPIXEL)
//| pin.direction = digitalio.Direction.OUTPUT
//| pixel_off = bytearray([0, 0, 0])
//| neopixel_write.neopixel_write(pin, pixel_off)
//|
//| .. note::
//|
//| This module is typically not used by user level code.
//|
//| For more information on actually using NeoPixels, refer to the `CircuitPython
//| Essentials Learn guide <https://learn.adafruit.com/circuitpython-essentials/circuitpython-neopixel>`_
//|
//| For a much more thorough guide about using NeoPixels, refer to the `Adafruit NeoPixel Überguide
//| <https://learn.adafruit.com/adafruit-neopixel-uberguide>`_.
//|
//| """
//|
//|
//| def neopixel_write(digitalinout: digitalio.DigitalInOut, buf: ReadableBuffer) -> None:
//| """Write buf out on the given DigitalInOut.
//|
//| :param ~digitalio.DigitalInOut digitalinout: the DigitalInOut to output with
//| :param ~circuitpython_typing.ReadableBuffer buf: The bytes to clock out. No assumption is made about color order
//| """
//| ...
//|
//|
static mp_obj_t neopixel_write_neopixel_write_(mp_obj_t digitalinout_obj, mp_obj_t buf) {
const digitalio_digitalinout_obj_t *digitalinout =
mp_arg_validate_type(digitalinout_obj, &digitalio_digitalinout_type, MP_QSTR_digitalinout);
// Check to see if the NeoPixel has been deinited before writing to it.
check_for_deinit(digitalinout_obj);
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(buf, &bufinfo, MP_BUFFER_READ);
// Call platform's neopixel write function with provided buffer and options.
common_hal_neopixel_write(digitalinout, (uint8_t *)bufinfo.buf, bufinfo.len);
return mp_const_none;
}
static MP_DEFINE_CONST_FUN_OBJ_2(neopixel_write_neopixel_write_obj, neopixel_write_neopixel_write_);
static const mp_rom_map_elem_t neopixel_write_module_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR___name__), MP_OBJ_NEW_QSTR(MP_QSTR_neopixel_write) },
{ MP_ROM_QSTR(MP_QSTR_neopixel_write), (mp_obj_t)&neopixel_write_neopixel_write_obj },
};
static MP_DEFINE_CONST_DICT(neopixel_write_module_globals, neopixel_write_module_globals_table);
const mp_obj_module_t neopixel_write_module = {
.base = { &mp_type_module },
.globals = (mp_obj_dict_t *)&neopixel_write_module_globals,
};
MP_REGISTER_MODULE(MP_QSTR_neopixel_write, neopixel_write_module);