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00ba887043 | ||
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5
Makefile
5
Makefile
@ -174,6 +174,11 @@ MPY_CFLAGS += -DMICROPY_PY_IMU=1
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MPY_MKARGS += MICROPY_PY_IMU=1
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endif
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ifeq ($(MICROPY_PY_CRC), 1)
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MPY_CFLAGS += -DMICROPY_PY_CRC=1
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MPY_MKARGS += MICROPY_PY_CRC=1
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endif
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ifeq ($(MICROPY_PY_BTREE), 1)
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MPY_CFLAGS += -DMICROPY_PY_BTREE=1
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MPY_MKARGS += MICROPY_PY_BTREE=1
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@ -20,6 +20,7 @@ MICROPY_PY_TOF = 1
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MICROPY_PY_ULAB = 1
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MICROPY_PY_DISPLAY = 1
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MICROPY_PY_IMU = 1
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MICROPY_PY_CRC = 1
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MICROPY_PY_AUDIO = 1
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MICROPY_PY_ML = 1
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MICROPY_PY_ML_TFLM = 1
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@ -30,6 +30,7 @@ MICROPY_PY_CSI = 1
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MICROPY_PY_CSI_NG = 1
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MICROPY_PY_FIR = 1
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MICROPY_PY_IMU = 1
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MICROPY_PY_CRC = 1
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MICROPY_PY_ULAB = 1
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MICROPY_PY_DISPLAY = 1
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MICROPY_PY_TV = 1
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97
modules/py_crc.c
Normal file
97
modules/py_crc.c
Normal file
@ -0,0 +1,97 @@
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/*
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* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2025 OpenMV, LLC.
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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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* CRC Python module for testing CRC implementations.
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*/
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#if MICROPY_PY_CRC
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#include "py/runtime.h"
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#include "py/obj.h"
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#include "omv_crc.h"
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// CRC16 function
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static mp_obj_t py_crc16(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kwargs) {
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_data, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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{ MP_QSTR_value, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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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, kwargs, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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mp_buffer_info_t bufinfo;
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mp_get_buffer_raise(args[0].u_obj, &bufinfo, MP_BUFFER_READ);
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uint16_t crc;
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if (args[1].u_obj == MP_OBJ_NULL) {
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crc = omv_crc16_start(bufinfo.buf, bufinfo.len);
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} else {
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uint16_t prev_crc = mp_obj_get_int_truncated(args[1].u_obj) & 0xFFFF;
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crc = omv_crc16_update(prev_crc, bufinfo.buf, bufinfo.len);
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}
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return mp_obj_new_int_from_uint(crc);
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}
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static MP_DEFINE_CONST_FUN_OBJ_KW(py_crc16_obj, 1, py_crc16);
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// CRC32 function
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static mp_obj_t py_crc32(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kwargs) {
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_data, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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{ MP_QSTR_value, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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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, kwargs, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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mp_buffer_info_t bufinfo;
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mp_get_buffer_raise(args[0].u_obj, &bufinfo, MP_BUFFER_READ);
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uint32_t crc;
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if (args[1].u_obj == MP_OBJ_NULL) {
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crc = omv_crc32_start(bufinfo.buf, bufinfo.len);
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} else {
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uint32_t prev_crc = mp_obj_get_int_truncated(args[1].u_obj);
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crc = omv_crc32_update(prev_crc, bufinfo.buf, bufinfo.len);
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}
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return mp_obj_new_int_from_uint(crc);
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}
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static MP_DEFINE_CONST_FUN_OBJ_KW(py_crc32_obj, 1, py_crc32);
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// Module globals table
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static const mp_rom_map_elem_t crc_module_globals_table[] = {
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{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_crc) },
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{ MP_ROM_QSTR(MP_QSTR_crc16), MP_ROM_PTR(&py_crc16_obj) },
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{ MP_ROM_QSTR(MP_QSTR_crc32), MP_ROM_PTR(&py_crc32_obj) },
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};
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static MP_DEFINE_CONST_DICT(crc_module_globals, crc_module_globals_table);
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// Define module object
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const mp_obj_module_t crc_user_cmodule = {
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.base = { &mp_type_module },
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.globals = (mp_obj_dict_t *) &crc_module_globals,
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};
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// Register the module to make it available in Python
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MP_REGISTER_MODULE(MP_QSTR_crc, crc_user_cmodule);
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#endif // MICROPY_PY_CRC
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@ -25,46 +25,78 @@
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#include "global_map.h"
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#include "omv_crc.h"
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#define CRC0 ((CRC_Type *)CRC0_BASE)
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// There seems to be a mismatch between how the Alif HW CRC32 algorithm
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// works and the other HW CRCs and the software implementation.
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// Just leaving this here just in case it works on a different series.
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#if 0
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#define CRC0 ((CRC_Type *) CRC0_BASE)
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static bool crc_initialized = false;
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static bool crc32_initialized = false;
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static void crc_calculate(CRC_Type *crc, const void *buf, uint32_t len, uint32_t *value);
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void omv_crc_init(void) {
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crc_clear_config(CRC0);
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crc_enable_16bit(CRC0);
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crc_enable_custom_poly(CRC0);
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crc_set_custom_poly(CRC0, OMV_CRC_POLY);
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crc_set_seed(CRC0, OMV_CRC_INIT);
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crc_enable(CRC0);
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crc_initialized = true;
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static void omv_crc32_init(void) {
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CRC0->CRC_CONTROL = CRC_32C |
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CRC_CUSTOM_POLY |
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CRC_ALGO_32_BIT_SIZE;
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CRC0->CRC_SEED = OMV_CRC32_INIT;
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CRC0->CRC_POLY_CUSTOM = OMV_CRC32_POLY;
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crc32_initialized = true;
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}
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omv_crc_t omv_crc_start(const void *buf, size_t size) {
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if (!crc_initialized) {
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omv_crc_init();
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uint32_t omv_crc32_start(const void *buf, size_t len) {
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uint32_t result = OMV_CRC32_INIT;
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if (!crc32_initialized) {
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omv_crc32_init();
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}
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if (size == 0) {
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return OMV_CRC_INIT;
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if (len == 0) {
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return OMV_CRC32_INIT;
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}
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uint32_t result = 0;
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crc_calculate_16bit(CRC0, buf, size, &result);
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return (omv_crc_t)result;
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crc_calculate(CRC0, buf, len, &result);
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return result;
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}
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omv_crc_t omv_crc_update(omv_crc_t crc, const void *buf, size_t size) {
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if (!crc_initialized) {
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omv_crc_init();
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uint32_t omv_crc32_update(uint32_t crc, const void *buf, size_t len) {
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uint32_t result = crc;
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if (!crc32_initialized) {
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omv_crc32_init();
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}
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if (size == 0) {
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if (len == 0) {
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return crc;
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}
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// Set current CRC value and calculate incrementally
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crc_set_seed(CRC0, crc);
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uint32_t result = 0;
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crc_calculate_16bit(CRC0, buf, size, &result);
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return (omv_crc_t)result;
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crc_calculate(CRC0, buf, len, &result);
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return result;
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}
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static void crc_calculate(CRC_Type *crc, const void *buf, uint32_t len, uint32_t *value) {
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const uint8_t *data = (const uint8_t *) buf;
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if ((len % 4) == 0) {
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// Use hardware only if length is multiple of 4
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crc->CRC_SEED = *value;
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crc->CRC_CONTROL |= CRC_INIT_BIT;
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// Hardware path - process all data as 32-bit words
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const uint32_t *data32 = (const uint32_t *) data;
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for (uint32_t i = 0; i < len / 4; i++) {
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crc->CRC_DATA_IN_32_0 = data32[i];
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}
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*value = crc->CRC_OUT;
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} else {
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// Software path - use lookup table
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uint32_t result = *value;
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extern const uint32_t crc32_table[256];
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for (uint32_t i = 0; i < len; i++) {
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uint8_t index = (result >> 24) ^ data[i];
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result = (result << 8) ^ crc32_table[index];
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}
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*value = result;
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}
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}
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#endif
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