ports/unix: Add py_clock to standard variant for doc generation.

OpenMV's extmod/modtime.c unconditionally includes "py_clock.h" and
registers py_clock_type in the time module. Standalone ports (the unix
port used by tools/gen-cpydiff.py to produce the CPython-differences
docs) have no py_clock and fail to build. Ship the OpenMV clock module
in the unix standard variant so the port builds and genrst can be
generated in CI.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: kwagyeman

ports/unix/variants/standard/py_clock.c

@@ -0,0 +1,102 @@
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2013-2024 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.
+ *
+ * Clock Python module.
+ */
+#include "py/obj.h"
+#include "py/mphal.h"
+#include "py_clock.h"
+
+/* Clock Type */
+typedef struct _py_clock_obj_t {
+    mp_obj_base_t base;
+    uint32_t t_start;
+    uint32_t t_ticks;
+    uint32_t t_frame;
+} py_clock_obj_t;
+
+mp_obj_t py_clock_tick(mp_obj_t clock_obj) {
+    py_clock_obj_t *clock = (py_clock_obj_t *) clock_obj;
+    clock->t_start = mp_hal_ticks_ms();
+    return mp_const_none;
+}
+static MP_DEFINE_CONST_FUN_OBJ_1(py_clock_tick_obj,  py_clock_tick);
+
+mp_obj_t py_clock_fps(mp_obj_t clock_obj) {
+    py_clock_obj_t *clock = (py_clock_obj_t *) clock_obj;
+    clock->t_frame++;
+    clock->t_ticks += (mp_hal_ticks_ms() - clock->t_start);
+    float fps = 1000.0f / (clock->t_ticks / (float) clock->t_frame);
+    return mp_obj_new_float(fps);
+}
+static MP_DEFINE_CONST_FUN_OBJ_1(py_clock_fps_obj,   py_clock_fps);
+
+mp_obj_t py_clock_avg(mp_obj_t clock_obj) {
+    py_clock_obj_t *clock = (py_clock_obj_t *) clock_obj;
+    clock->t_frame++;
+    clock->t_ticks += (mp_hal_ticks_ms() - clock->t_start);
+    return mp_obj_new_float(clock->t_ticks / (float) clock->t_frame);
+}
+static MP_DEFINE_CONST_FUN_OBJ_1(py_clock_avg_obj,   py_clock_avg);
+
+mp_obj_t py_clock_reset(mp_obj_t clock_obj) {
+    py_clock_obj_t *clock = (py_clock_obj_t *) clock_obj;
+    clock->t_start = 0;
+    clock->t_ticks = 0;
+    clock->t_frame = 0;
+    return mp_const_none;
+}
+static MP_DEFINE_CONST_FUN_OBJ_1(py_clock_reset_obj, py_clock_reset);
+
+static void py_clock_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
+    py_clock_obj_t *self = self_in;
+    mp_printf(print, "t_start:%d t_ticks:%d t_frame:%d\n", self->t_start, self->t_ticks, self->t_frame);
+}
+
+mp_obj_t py_clock_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
+    py_clock_obj_t *clock = NULL;
+    clock = m_new_obj(py_clock_obj_t);
+    clock->base.type = &py_clock_type;
+    clock->t_start = 0;
+    clock->t_ticks = 0;
+    clock->t_frame = 0;
+    return MP_OBJ_FROM_PTR(clock);
+}
+
+static const mp_rom_map_elem_t py_clock_locals_dict_table[] = {
+    { MP_OBJ_NEW_QSTR(MP_QSTR_tick),   MP_ROM_PTR(&py_clock_tick_obj)},
+    { MP_OBJ_NEW_QSTR(MP_QSTR_fps),    MP_ROM_PTR(&py_clock_fps_obj)},
+    { MP_OBJ_NEW_QSTR(MP_QSTR_avg),    MP_ROM_PTR(&py_clock_avg_obj)},
+    { MP_OBJ_NEW_QSTR(MP_QSTR_reset),  MP_ROM_PTR(&py_clock_reset_obj)},
+    { NULL, NULL },
+};
+static MP_DEFINE_CONST_DICT(py_clock_locals_dict, py_clock_locals_dict_table);
+
+MP_DEFINE_CONST_OBJ_TYPE(
+    py_clock_type,
+    MP_QSTR_Clock,
+    MP_TYPE_FLAG_NONE,
+    print, py_clock_print,
+    make_new, py_clock_make_new,
+    locals_dict, &py_clock_locals_dict
+    );

ports/unix/variants/standard/py_clock.h

@@ -0,0 +1,29 @@
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2013-2024 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.
+ *
+ * Clock Python module.
+ */
+#ifndef __PY_CLOCK_H__
+#define __PY_CLOCK_H__
+extern const mp_obj_type_t py_clock_type;
+#endif // __PY_CLOCK_H__