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Diffstat (limited to 'stmhal/moduselect.c')
| -rw-r--r-- | stmhal/moduselect.c | 310 |
1 files changed, 310 insertions, 0 deletions
diff --git a/stmhal/moduselect.c b/stmhal/moduselect.c new file mode 100644 index 0000000000..d1bf522893 --- /dev/null +++ b/stmhal/moduselect.c @@ -0,0 +1,310 @@ +/* + * This file is part of the Micro Python project, http://micropython.org/ + * + * The MIT License (MIT) + * + * Copyright (c) 2014 Damien P. George + * + * 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 <stdint.h> +#include <stdio.h> +#include <errno.h> + +#include "stm32f4xx_hal.h" + +#include "mpconfig.h" +#include "misc.h" +#include "nlr.h" +#include "qstr.h" +#include "obj.h" +#include "objlist.h" +#include "pybioctl.h" + +/// \module select - Provides select function to wait for events on a stream +/// +/// This module provides the select function. + +typedef struct _poll_obj_t { + mp_obj_t obj; + mp_uint_t (*ioctl)(mp_obj_t obj, mp_uint_t request, int *errcode, ...); + mp_uint_t flags; + mp_uint_t flags_ret; +} poll_obj_t; + +STATIC void poll_map_add(mp_map_t *poll_map, const mp_obj_t *obj, mp_uint_t obj_len, mp_uint_t flags, bool or_flags) { + for (mp_uint_t i = 0; i < obj_len; i++) { + mp_map_elem_t *elem = mp_map_lookup(poll_map, mp_obj_id(obj[i]), MP_MAP_LOOKUP_ADD_IF_NOT_FOUND); + if (elem->value == NULL) { + // object not found; get its ioctl and add it to the poll list + mp_obj_type_t *type = mp_obj_get_type(obj[i]); + if (type->stream_p == NULL || type->stream_p->ioctl == NULL) { + nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError, "object with stream.ioctl required")); + } + poll_obj_t *poll_obj = m_new_obj(poll_obj_t); + poll_obj->obj = obj[i]; + poll_obj->ioctl = type->stream_p->ioctl; + poll_obj->flags = flags; + poll_obj->flags_ret = 0; + elem->value = poll_obj; + } else { + // object exists; update its flags + if (or_flags) { + ((poll_obj_t*)elem->value)->flags |= flags; + } else { + ((poll_obj_t*)elem->value)->flags = flags; + } + } + } +} + +// poll each object in the map +STATIC mp_uint_t poll_map_poll(mp_map_t *poll_map, mp_uint_t *rwx_num) { + mp_uint_t n_ready = 0; + for (mp_uint_t i = 0; i < poll_map->alloc; ++i) { + if (!MP_MAP_SLOT_IS_FILLED(poll_map, i)) { + continue; + } + + poll_obj_t *poll_obj = (poll_obj_t*)poll_map->table[i].value; + int errcode; + mp_int_t ret = poll_obj->ioctl(poll_obj->obj, MP_IOCTL_POLL, &errcode, poll_obj->flags); + poll_obj->flags_ret = ret; + + if (ret == -1) { + // error doing ioctl + nlr_raise(mp_obj_new_exception_arg1(&mp_type_OSError, MP_OBJ_NEW_SMALL_INT(errcode))); + } + + if (ret != 0) { + // object is ready + n_ready += 1; + if (rwx_num != NULL) { + if (ret & MP_IOCTL_POLL_RD) { + rwx_num[0] += 1; + } + if (ret & MP_IOCTL_POLL_WR) { + rwx_num[1] += 1; + } + if ((ret & ~(MP_IOCTL_POLL_RD | MP_IOCTL_POLL_WR)) != 0) { + rwx_num[2] += 1; + } + } + } + } + return n_ready; +} + +/// \function select(rlist, wlist, xlist[, timeout]) +STATIC mp_obj_t select_select(uint n_args, const mp_obj_t *args) { + // get array data from tuple/list arguments + mp_uint_t rwx_len[3]; + mp_obj_t *r_array, *w_array, *x_array; + mp_obj_get_array(args[0], &rwx_len[0], &r_array); + mp_obj_get_array(args[1], &rwx_len[1], &w_array); + mp_obj_get_array(args[2], &rwx_len[2], &x_array); + + // get timeout + mp_uint_t timeout = -1; + if (n_args == 4) { + if (args[3] != mp_const_none) { + #if MICROPY_PY_BUILTINS_FLOAT + float timeout_f = mp_obj_get_float(args[3]); + if (timeout_f >= 0) { + timeout = (mp_uint_t)(timeout_f * 1000); + } + #else + timeout = mp_obj_get_int(args[3]) * 1000; + #endif + } + } + + // merge separate lists and get the ioctl function for each object + mp_map_t poll_map; + mp_map_init(&poll_map, rwx_len[0] + rwx_len[1] + rwx_len[2]); + poll_map_add(&poll_map, r_array, rwx_len[0], MP_IOCTL_POLL_RD, true); + poll_map_add(&poll_map, w_array, rwx_len[1], MP_IOCTL_POLL_WR, true); + poll_map_add(&poll_map, x_array, rwx_len[2], MP_IOCTL_POLL_ERR | MP_IOCTL_POLL_HUP, true); + + mp_uint_t start_tick = HAL_GetTick(); + rwx_len[0] = rwx_len[1] = rwx_len[2] = 0; + for (;;) { + // poll the objects + mp_uint_t n_ready = poll_map_poll(&poll_map, rwx_len); + + if (n_ready > 0 || (timeout != -1 && HAL_GetTick() - start_tick >= timeout)) { + // one or more objects are ready, or we had a timeout + mp_obj_t list_array[3]; + list_array[0] = mp_obj_new_list(rwx_len[0], NULL); + list_array[1] = mp_obj_new_list(rwx_len[1], NULL); + list_array[2] = mp_obj_new_list(rwx_len[2], NULL); + rwx_len[0] = rwx_len[1] = rwx_len[2] = 0; + for (mp_uint_t i = 0; i < poll_map.alloc; ++i) { + if (!MP_MAP_SLOT_IS_FILLED(&poll_map, i)) { + continue; + } + poll_obj_t *poll_obj = (poll_obj_t*)poll_map.table[i].value; + if (poll_obj->flags_ret & MP_IOCTL_POLL_RD) { + ((mp_obj_list_t*)list_array[0])->items[rwx_len[0]++] = poll_obj->obj; + } + if (poll_obj->flags_ret & MP_IOCTL_POLL_WR) { + ((mp_obj_list_t*)list_array[1])->items[rwx_len[1]++] = poll_obj->obj; + } + if ((poll_obj->flags_ret & ~(MP_IOCTL_POLL_RD | MP_IOCTL_POLL_WR)) != 0) { + ((mp_obj_list_t*)list_array[2])->items[rwx_len[2]++] = poll_obj->obj; + } + } + mp_map_deinit(&poll_map); + return mp_obj_new_tuple(3, list_array); + } + __WFI(); + } +} +MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_select_select_obj, 3, 4, select_select); + +/// \class Poll - poll class + +typedef struct _mp_obj_poll_t { + mp_obj_base_t base; + mp_map_t poll_map; +} mp_obj_poll_t; + +/// \method register(obj[, eventmask]) +STATIC mp_obj_t poll_register(uint n_args, const mp_obj_t *args) { + mp_obj_poll_t *self = args[0]; + mp_uint_t flags; + if (n_args == 3) { + flags = mp_obj_get_int(args[2]); + } else { + flags = MP_IOCTL_POLL_RD | MP_IOCTL_POLL_WR; + } + poll_map_add(&self->poll_map, &args[1], 1, flags, false); + return mp_const_none; +} +MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(poll_register_obj, 2, 3, poll_register); + +/// \method unregister(obj) +STATIC mp_obj_t poll_unregister(mp_obj_t self_in, mp_obj_t obj_in) { + mp_obj_poll_t *self = self_in; + mp_map_lookup(&self->poll_map, mp_obj_id(obj_in), MP_MAP_LOOKUP_REMOVE_IF_FOUND); + // TODO raise KeyError if obj didn't exist in map + return mp_const_none; +} +MP_DEFINE_CONST_FUN_OBJ_2(poll_unregister_obj, poll_unregister); + +/// \method modify(obj, eventmask) +STATIC mp_obj_t poll_modify(mp_obj_t self_in, mp_obj_t obj_in, mp_obj_t eventmask_in) { + mp_obj_poll_t *self = self_in; + mp_map_elem_t *elem = mp_map_lookup(&self->poll_map, mp_obj_id(obj_in), MP_MAP_LOOKUP); + if (elem == NULL) { + nlr_raise(mp_obj_new_exception_arg1(&mp_type_OSError, MP_OBJ_NEW_SMALL_INT(ENOENT))); + } + ((poll_obj_t*)elem->value)->flags = mp_obj_get_int(eventmask_in); + return mp_const_none; +} +MP_DEFINE_CONST_FUN_OBJ_3(poll_modify_obj, poll_modify); + +/// \method poll([timeout]) +/// Timeout is in milliseconds. +STATIC mp_obj_t poll_poll(uint n_args, const mp_obj_t *args) { + mp_obj_poll_t *self = args[0]; + + // work out timeout (its given already in ms) + mp_uint_t timeout = -1; + if (n_args == 2) { + if (args[1] != mp_const_none) { + mp_int_t timeout_i = mp_obj_get_int(args[1]); + if (timeout_i >= 0) { + timeout = timeout_i; + } + } + } + + mp_uint_t start_tick = HAL_GetTick(); + for (;;) { + // poll the objects + mp_uint_t n_ready = poll_map_poll(&self->poll_map, NULL); + + if (n_ready > 0 || (timeout != -1 && HAL_GetTick() - start_tick >= timeout)) { + // one or more objects are ready, or we had a timeout + mp_obj_list_t *ret_list = mp_obj_new_list(n_ready, NULL); + mp_uint_t n_ready = 0; + for (mp_uint_t i = 0; i < self->poll_map.alloc; ++i) { + if (!MP_MAP_SLOT_IS_FILLED(&self->poll_map, i)) { + continue; + } + poll_obj_t *poll_obj = (poll_obj_t*)self->poll_map.table[i].value; + if (poll_obj->flags_ret != 0) { + mp_obj_t tuple[2] = {poll_obj->obj, MP_OBJ_NEW_SMALL_INT(poll_obj->flags_ret)}; + ret_list->items[n_ready++] = mp_obj_new_tuple(2, tuple); + } + } + return ret_list; + } + __WFI(); + } +} +MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(poll_poll_obj, 1, 2, poll_poll); + +STATIC const mp_map_elem_t poll_locals_dict_table[] = { + { MP_OBJ_NEW_QSTR(MP_QSTR_register), (mp_obj_t)&poll_register_obj }, + { MP_OBJ_NEW_QSTR(MP_QSTR_unregister), (mp_obj_t)&poll_unregister_obj }, + { MP_OBJ_NEW_QSTR(MP_QSTR_modify), (mp_obj_t)&poll_modify_obj }, + { MP_OBJ_NEW_QSTR(MP_QSTR_poll), (mp_obj_t)&poll_poll_obj }, +}; +STATIC MP_DEFINE_CONST_DICT(poll_locals_dict, poll_locals_dict_table); + +STATIC const mp_obj_type_t mp_type_poll = { + { &mp_type_type }, + .name = MP_QSTR_poll, + .locals_dict = (mp_obj_t)&poll_locals_dict, +}; + +/// \function poll() +STATIC mp_obj_t select_poll(void) { + mp_obj_poll_t *poll = m_new_obj(mp_obj_poll_t); + poll->base.type = &mp_type_poll; + mp_map_init(&poll->poll_map, 0); + return poll; +} +MP_DEFINE_CONST_FUN_OBJ_0(mp_select_poll_obj, select_poll); + +STATIC const mp_map_elem_t mp_module_select_globals_table[] = { + { MP_OBJ_NEW_QSTR(MP_QSTR___name__), MP_OBJ_NEW_QSTR(MP_QSTR_uselect) }, + { MP_OBJ_NEW_QSTR(MP_QSTR_select), (mp_obj_t)&mp_select_select_obj }, + { MP_OBJ_NEW_QSTR(MP_QSTR_poll), (mp_obj_t)&mp_select_poll_obj }, +}; + +STATIC const mp_obj_dict_t mp_module_select_globals = { + .base = {&mp_type_dict}, + .map = { + .all_keys_are_qstrs = 1, + .table_is_fixed_array = 1, + .used = MP_ARRAY_SIZE(mp_module_select_globals_table), + .alloc = MP_ARRAY_SIZE(mp_module_select_globals_table), + .table = (mp_map_elem_t*)mp_module_select_globals_table, + }, +}; + +const mp_obj_module_t mp_module_uselect = { + .base = { &mp_type_module }, + .name = MP_QSTR_uselect, + .globals = (mp_obj_dict_t*)&mp_module_select_globals, +}; 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