/* * SPDX-License-Identifier: MIT * * Copyright (C) 2025 OpenMV, LLC. * * 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. * * CRC Python module for testing CRC implementations. */ #if MICROPY_PY_CRC #include "py/runtime.h" #include "py/obj.h" #include "omv_crc.h" // CRC16 function static mp_obj_t py_crc16(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kwargs) { static const mp_arg_t allowed_args[] = { { MP_QSTR_data, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} }, { MP_QSTR_value, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} }, }; mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)]; mp_arg_parse_all(n_args, pos_args, kwargs, MP_ARRAY_SIZE(allowed_args), allowed_args, args); mp_buffer_info_t bufinfo; mp_get_buffer_raise(args[0].u_obj, &bufinfo, MP_BUFFER_READ); uint16_t crc; if (args[1].u_obj == MP_OBJ_NULL) { crc = omv_crc16_start(bufinfo.buf, bufinfo.len); } else { uint16_t prev_crc = mp_obj_get_int_truncated(args[1].u_obj) & 0xFFFF; crc = omv_crc16_update(prev_crc, bufinfo.buf, bufinfo.len); } return mp_obj_new_int_from_uint(crc); } static MP_DEFINE_CONST_FUN_OBJ_KW(py_crc16_obj, 1, py_crc16); // CRC32 function static mp_obj_t py_crc32(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kwargs) { static const mp_arg_t allowed_args[] = { { MP_QSTR_data, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} }, { MP_QSTR_value, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} }, }; mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)]; mp_arg_parse_all(n_args, pos_args, kwargs, MP_ARRAY_SIZE(allowed_args), allowed_args, args); mp_buffer_info_t bufinfo; mp_get_buffer_raise(args[0].u_obj, &bufinfo, MP_BUFFER_READ); uint32_t crc; if (args[1].u_obj == MP_OBJ_NULL) { crc = omv_crc32_start(bufinfo.buf, bufinfo.len); } else { uint32_t prev_crc = mp_obj_get_int_truncated(args[1].u_obj); crc = omv_crc32_update(prev_crc, bufinfo.buf, bufinfo.len); } return mp_obj_new_int_from_uint(crc); } static MP_DEFINE_CONST_FUN_OBJ_KW(py_crc32_obj, 1, py_crc32); // Module globals table static const mp_rom_map_elem_t crc_module_globals_table[] = { { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_crc) }, { MP_ROM_QSTR(MP_QSTR_crc16), MP_ROM_PTR(&py_crc16_obj) }, { MP_ROM_QSTR(MP_QSTR_crc32), MP_ROM_PTR(&py_crc32_obj) }, }; static MP_DEFINE_CONST_DICT(crc_module_globals, crc_module_globals_table); // Define module object const mp_obj_module_t crc_user_cmodule = { .base = { &mp_type_module }, .globals = (mp_obj_dict_t *) &crc_module_globals, }; // Register the module to make it available in Python MP_REGISTER_MODULE(MP_QSTR_crc, crc_user_cmodule); #endif // MICROPY_PY_CRC