134 lines
5.4 KiB
C
134 lines
5.4 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2016 Scott Shawcroft for Adafruit Industries
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "shared-bindings/neopixel_write/__init__.h"
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#include "py/obj.h"
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#include "py/mphal.h"
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#include "py/runtime.h"
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#include "shared-bindings/digitalio/DigitalInOut.h"
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#include "shared-bindings/util.h"
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#include "supervisor/shared/translate.h"
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// RGB LED timing information:
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// From the WS2811 datasheet: high speed mode
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// - T0H 0 code,high voltage time 0.25 us +-150ns
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// - T1H 1 code,high voltage time 0.6 us +-150ns
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// - T0L 0 code,low voltage time 1.0 us +-150ns
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// - T1L 1 code,low voltage time 0.65 us +-150ns
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// - RES low voltage time Above 50us
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// From the SK6812 datasheet:
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// - T0H 0 code, high level time 0.3us +-0.15us
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// - T1H 1 code, high level time 0.6us +-0.15us
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// - T0L 0 code, low level time 0.9us +-0.15us
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// - T1L 1 code, low level time 0.6us +-0.15us
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// - Trst Reset code，low level time 80us
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// From the WS2812 datasheet:
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// - T0H 0 code, high voltage time 0.35us +-150ns
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// - T1H 1 code, high voltage time 0.7us +-150ns
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// - T0L 0 code, low voltage time 0.8us +-150ns
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// - T1L 1 code, low voltage time 0.6us +-150ns
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// - RES low voltage time Above 50us
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// From the WS28212B datasheet:
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// - T0H 0 code, high voltage time 0.4us +-150ns
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// - T1H 1 code, high voltage time 0.8us +-150ns
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// - T0L 0 code, low voltage time 0.85us +-150ns
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// - T1L 1 code, low voltage time 0.45us +-150ns
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// - RES low voltage time Above 50us
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// The timings used in various ports do not always follow the guidelines above.
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// In general, a zero bit is about 300ns high, 900ns low.
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// A one bit is about 700ns high, 500ns low.
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// But the ports vary based on implementation considerations; the proof is in the testing.
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// https://adafru.it/5225 is more sensitive to timing and should be included in testing.
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STATIC void check_for_deinit(digitalio_digitalinout_obj_t *self) {
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if (common_hal_digitalio_digitalinout_deinited(self)) {
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raise_deinited_error();
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}
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}
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//| """Low-level neopixel implementation
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//|
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//| The `neopixel_write` module contains a helper method to write out bytes in
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//| the 800khz neopixel protocol.
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//|
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//| For example, to turn off a single neopixel (like the status pixel on Express
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//| boards.)
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//|
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//| .. code-block:: python
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//|
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//| import board
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//| import neopixel_write
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//| import digitalio
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//|
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//| pin = digitalio.DigitalInOut(board.NEOPIXEL)
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//| pin.direction = digitalio.Direction.OUTPUT
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//| pixel_off = bytearray([0, 0, 0])
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//| neopixel_write.neopixel_write(pin, pixel_off)"""
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//|
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//| def neopixel_write(digitalinout: digitalio.DigitalInOut, buf: ReadableBuffer) -> None:
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//| """Write buf out on the given DigitalInOut.
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//|
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//| :param ~digitalio.DigitalInOut digitalinout: the DigitalInOut to output with
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//| :param ~circuitpython_typing.ReadableBuffer buf: The bytes to clock out. No assumption is made about color order"""
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//| ...
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STATIC mp_obj_t neopixel_write_neopixel_write_(mp_obj_t digitalinout_obj, mp_obj_t buf) {
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if (!mp_obj_is_type(digitalinout_obj, &digitalio_digitalinout_type)) {
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mp_raise_TypeError_varg(translate("Expected a %q"), digitalio_digitalinout_type.name);
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}
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// Convert parameters into expected types.
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const digitalio_digitalinout_obj_t *digitalinout = MP_OBJ_TO_PTR(digitalinout_obj);
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// Check to see if the NeoPixel has been deinited before writing to it.
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check_for_deinit(digitalinout_obj);
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mp_buffer_info_t bufinfo;
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mp_get_buffer_raise(buf, &bufinfo, MP_BUFFER_READ);
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// Call platform's neopixel write function with provided buffer and options.
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common_hal_neopixel_write(digitalinout, (uint8_t *)bufinfo.buf, bufinfo.len);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_2(neopixel_write_neopixel_write_obj, neopixel_write_neopixel_write_);
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STATIC const mp_rom_map_elem_t neopixel_write_module_globals_table[] = {
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{ MP_OBJ_NEW_QSTR(MP_QSTR___name__), MP_OBJ_NEW_QSTR(MP_QSTR_neopixel_write) },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_neopixel_write), (mp_obj_t)&neopixel_write_neopixel_write_obj },
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};
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STATIC MP_DEFINE_CONST_DICT(neopixel_write_module_globals, neopixel_write_module_globals_table);
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const mp_obj_module_t neopixel_write_module = {
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.base = { &mp_type_module },
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.globals = (mp_obj_dict_t *)&neopixel_write_module_globals,
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};
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MP_REGISTER_MODULE(MP_QSTR_neopixel_write, neopixel_write_module, CIRCUITPY_NEOPIXEL_WRITE);
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