9cf7d73c6c
.. this version can only handle exactly 8 bits "across". The restriction may be relaxed in a future revision.
88 lines
3.8 KiB
C
88 lines
3.8 KiB
C
/*
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* This file is part of the Circuit Python project, https://github.com/adafruit/circuitpython
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2018 Roy Hooper
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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 "py/obj.h"
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#include "py/runtime.h"
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#include "shared-bindings/_bit_transpose/__init__.h"
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//| """A fast bit transposition function for parallel NeoPixel strips
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//|
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//| When driving multiple NeoPixel strips from a shift register, the bits
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//| must be re-ordered in a specific way. This module offers a low-level
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//| routine for performing the transformation."""
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//|
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//| def bit_transpose(input: _typing.ReadableBuffer, *, output: Optional[_typing.WritableBuffer]=None):
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//| """Convert a sequence of 8*N pixel values into a single stream of bytes suitable for sending via a parallel conversion method (PioPixl8)
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//|
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//| Returns the output buffer if specified (which must be big enough to hold the result), otherwise a freshly allocated buffer."""
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//| ...
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//|
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STATIC mp_obj_t bit_transpose(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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enum { ARG_input, ARG_output };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_input, MP_ARG_OBJ | MP_ARG_REQUIRED, {} },
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{ MP_QSTR_output, MP_ARG_OBJ | MP_ARG_KW_ONLY, { .u_obj = mp_const_none } },
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};
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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mp_buffer_info_t input_bufinfo;
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mp_buffer_info_t output_bufinfo;
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mp_get_buffer_raise(args[ARG_input].u_obj, &input_bufinfo, MP_BUFFER_READ);
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int n = input_bufinfo.len;
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if (n % 8 != 0) {
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mp_raise_ValueError(translate("Input buffer must be a multiple of 8 bytes"));
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}
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mp_obj_t output = args[ARG_output].u_obj;
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if (!output || output == mp_const_none) {
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output = mp_obj_new_bytearray_of_zeros(n);
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}
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mp_get_buffer_raise(output, &output_bufinfo, MP_BUFFER_WRITE);
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int m = output_bufinfo.len;
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if (m < n) {
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mp_raise_ValueError(translate("Output buffer must be at least as big as input buffer"));
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}
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common_hal_bit_transpose_bit_transpose(output_bufinfo.buf, input_bufinfo.buf, input_bufinfo.len);
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return output;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_KW(bit_transpose_bit_transpose_obj, 1, bit_transpose);
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STATIC const mp_rom_map_elem_t bit_transpose_module_globals_table[] = {
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{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR__bit_transpose) },
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{ MP_ROM_QSTR(MP_QSTR_bit_transpose), MP_ROM_PTR(&bit_transpose_bit_transpose_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(bit_transpose_module_globals, bit_transpose_module_globals_table);
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const mp_obj_module_t bit_transpose_module = {
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.base = { &mp_type_module },
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.globals = (mp_obj_dict_t*)&bit_transpose_module_globals,
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};
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