circuitpython/nrf/modules/machine/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;
    hal_timer_conf_t * p_config;
    mp_obj_t callback;
    mp_int_t period;
    mp_int_t mode;
} machine_timer_obj_t;

static hal_timer_conf_t timer_config0 = {.id = 0};
static hal_timer_conf_t timer_config1 = {.id = 1};
static hal_timer_conf_t timer_config2 = {.id = 2};

#if NRF52
static hal_timer_conf_t timer_config3 = {.id = 3};
static hal_timer_conf_t timer_config4 = {.id = 4};
#endif

STATIC machine_timer_obj_t machine_timer_obj[] = {
    {{&machine_timer_type}, &timer_config0},
    {{&machine_timer_type}, &timer_config1},
    {{&machine_timer_type}, &timer_config2},
#if NRF52
    {{&machine_timer_type}, &timer_config3},
    {{&machine_timer_type}, &timer_config4},
#endif
};

STATIC void hal_interrupt_handle(uint8_t id) {
    machine_timer_obj_t * self = &machine_timer_obj[id];

    mp_call_function_1(self->callback, self);

    if (self != NULL) {
        hal_timer_stop(id);
        if (self->mode == 1) {
            hal_timer_start(id);
        }
    }
}

void timer_init0(void) {
    hal_timer_callback_set(hal_interrupt_handle);
}

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].p_config != 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->p_config->id);
}

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

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)} },
        { MP_QSTR_period,   MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 1000} },
        { MP_QSTR_mode,     MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 1} },
        { MP_QSTR_callback, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
    };

    // 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);

    // get static peripheral object
    int timer_id = timer_find(args[0].u_obj);

#if BLUETOOTH_SD
    if (timer_id == 0) {
        nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
                  "Timer(%d) reserved by Bluetooth LE stack.", timer_id));
    }
#endif

#if MICROPY_PY_MACHINE_SOFT_PWM
    if (timer_id == 1) {
        nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
                  "Timer(%d) reserved by ticker driver.", timer_id));
    }
#endif

    machine_timer_obj_t *self = &machine_timer_obj[timer_id];

    self->p_config->period = args[1].u_int;

    self->mode = args[2].u_int;

    if (args[3].u_obj != mp_const_none) {
        self->callback = args[3].u_obj;
    }

#ifdef NRF51
    self->p_config->irq_priority = 3;
#else
    self->p_config->irq_priority = 6;
#endif

    hal_timer_init(self->p_config);

    return MP_OBJ_FROM_PTR(self);
}

/// \method start(period)
/// Start the timer.
///
STATIC mp_obj_t machine_timer_start(mp_obj_t self_in) {
    machine_timer_obj_t * self = MP_OBJ_TO_PTR(self_in);

    hal_timer_start(self->p_config->id);

    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_timer_start_obj, machine_timer_start);

/// \method stop()
/// Stop the timer.
///
STATIC mp_obj_t machine_timer_stop(mp_obj_t self_in) {
    machine_timer_obj_t * self = MP_OBJ_TO_PTR(self_in);

    hal_timer_stop(self->p_config->id);

    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_timer_stop_obj, machine_timer_stop);

STATIC const mp_rom_map_elem_t machine_timer_locals_dict_table[] = {
    { MP_ROM_QSTR(MP_QSTR_start), MP_ROM_PTR(&machine_timer_start_obj) },
    { MP_ROM_QSTR(MP_QSTR_stop),  MP_ROM_PTR(&machine_timer_stop_obj) },

    // constants
    { MP_ROM_QSTR(MP_QSTR_ONESHOT),  MP_ROM_INT(0) },
    { MP_ROM_QSTR(MP_QSTR_PERIODIC), MP_ROM_INT(1) },
};

STATIC MP_DEFINE_CONST_DICT(machine_timer_locals_dict, machine_timer_locals_dict_table);

const mp_obj_type_t machine_timer_type = {
    { &mp_type_type },
    .name = MP_QSTR_Timer,
    .print = timer_print,
    .make_new = machine_timer_make_new,
    .locals_dict = (mp_obj_dict_t*)&machine_timer_locals_dict
};

#endif // MICROPY_PY_MACHINE_TIMER