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/*
* This file is part of the Circuit Python project, https://github.com/adafruit/circuitpython
*
* The MIT License (MIT)
*
* Copyright (c) 2018 Roy Hooper
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "py/obj.h"
#include "py/runtime.h"
#include "shared-bindings/_bit_transpose/__init__.h"
//| """A fast bit transposition function for parallel NeoPixel strips
//|
//| When driving multiple NeoPixel strips from a shift register, the bits
//| must be re-ordered in a specific way. This module offers a low-level
//| routine for performing the transformation."""
//|
//| def bit_transpose(input: _typing.ReadableBuffer, *, output: Optional[_typing.WritableBuffer]=None):
//| """Convert a sequence of 8*N pixel values into a single stream of bytes suitable for sending via a parallel conversion method (PioPixl8)
//|
//| Returns the output buffer if specified (which must be big enough to hold the result), otherwise a freshly allocated buffer."""
//| ...
//|
STATIC mp_obj_t bit_transpose(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
enum { ARG_input, ARG_output };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_input, MP_ARG_OBJ | MP_ARG_REQUIRED, {} },
{ MP_QSTR_output, MP_ARG_OBJ | MP_ARG_KW_ONLY, { .u_obj = mp_const_none } },
};
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
mp_buffer_info_t input_bufinfo;
mp_buffer_info_t output_bufinfo;
mp_get_buffer_raise(args[ARG_input].u_obj, &input_bufinfo, MP_BUFFER_READ);
int n = input_bufinfo.len;
if (n % 8 != 0) {
mp_raise_ValueError(translate("Input buffer must be a multiple of 8 bytes"));
}
mp_obj_t output = args[ARG_output].u_obj;
if (!output || output == mp_const_none) {
output = mp_obj_new_bytearray_of_zeros(n);
}
mp_get_buffer_raise(output, &output_bufinfo, MP_BUFFER_WRITE);
int m = output_bufinfo.len;
if (m < n) {
mp_raise_ValueError(translate("Output buffer must be at least as big as input buffer"));
}
common_hal_bit_transpose_bit_transpose(output_bufinfo.buf, input_bufinfo.buf, input_bufinfo.len);
return output;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(bit_transpose_bit_transpose_obj, 1, bit_transpose);
STATIC const mp_rom_map_elem_t bit_transpose_module_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR__bit_transpose) },
{ MP_ROM_QSTR(MP_QSTR_bit_transpose), MP_ROM_PTR(&bit_transpose_bit_transpose_obj) },
};
STATIC MP_DEFINE_CONST_DICT(bit_transpose_module_globals, bit_transpose_module_globals_table);
const mp_obj_module_t bit_transpose_module = {
.base = { &mp_type_module },
.globals = (mp_obj_dict_t*)&bit_transpose_module_globals,
};
|
