circuitpython/nrf5/timer.c

/*
 * This file is part of the Micro Python project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2016 Glenn Ruben Bakke
 *
 * 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 <stdio.h>
#include <string.h>

#include "py/nlr.h"
#include "py/runtime.h"
#include "py/mphal.h"
#include "timer.h"
#include "hal_timer.h"

#if MICROPY_PY_MACHINE_TIMER

typedef struct _machine_timer_obj_t {
    mp_obj_base_t base;
    Timer_HandleTypeDef *timer;
} machine_timer_obj_t;

Timer_HandleTypeDef TimerHandle0 = {.instance = NULL, .id = 0};
Timer_HandleTypeDef TimerHandle1 = {.instance = NULL, .id = 1};
Timer_HandleTypeDef TimerHandle2 = {.instance = NULL, .id = 2};

STATIC const machine_timer_obj_t machine_timer_obj[] = {
    {{&machine_timer_type}, &TimerHandle0},
    {{&machine_timer_type}, &TimerHandle1},
    {{&machine_timer_type}, &TimerHandle2},
};

void timer_init0(void) {
    // reset the Timer handles
    memset(&TimerHandle0, 0, sizeof(Timer_HandleTypeDef));
    TimerHandle0.instance = TIMER0;
    memset(&TimerHandle1, 0, sizeof(Timer_HandleTypeDef));
    TimerHandle0.instance = TIMER1;
    memset(&TimerHandle2, 0, sizeof(Timer_HandleTypeDef));
    TimerHandle0.instance = TIMER2;
}

STATIC int timer_find(mp_obj_t id) {
    // given an integer id
    int timer_id = mp_obj_get_int(id);
    if (timer_id >= 0 && timer_id <= MP_ARRAY_SIZE(machine_timer_obj)
        && machine_timer_obj[timer_id].timer != NULL) {
        return timer_id;
    }
    nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
        "Timer(%d) does not exist", timer_id));
}

STATIC void timer_print(const mp_print_t *print, mp_obj_t o, mp_print_kind_t kind) {
    machine_timer_obj_t *self = o;
    mp_printf(print, "Timer(%u)", self->timer->id);
}

/******************************************************************************/
/* MicroPython bindings for machine API                                       */

// for make_new
enum {
    ARG_NEW_id,
};

STATIC mp_obj_t machine_timer_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
    static const mp_arg_t allowed_args[] = {
        { MP_QSTR_id,       MP_ARG_OBJ, {.u_obj = MP_OBJ_NEW_SMALL_INT(-1)} },
    };

    // parse args
    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
    mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);

    if (args[ARG_NEW_id].u_obj == MP_OBJ_NEW_SMALL_INT(-1)) {
        // index -1 does not exist
        return mp_const_none;
        // TODO: raise exception
    }

    // get static peripheral object
    int timer_id = timer_find(args[ARG_NEW_id].u_obj);
    const machine_timer_obj_t *self = &machine_timer_obj[timer_id];

    hal_timer_init(self->timer->instance, &self->timer->init);

    return MP_OBJ_FROM_PTR(self);
}

const mp_obj_type_t machine_timer_type = {
    { &mp_type_type },
    .name = MP_QSTR_Timer,
    .print = timer_print,
    .make_new = machine_timer_make_new,
#if 0
    .locals_dict = (mp_obj_t)&machine_timer_locals_dict
#endif
};

#endif // MICROPY_PY_MACHINE_TIMER