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circuitpython/ports/nrf/modules/machine/timer.c

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/*
* This file is part of the MicroPython 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 "py/nlr.h"
#include "py/runtime.h"
#include "timer.h"
#include "nrfx_timer.h"
#if MICROPY_PY_MACHINE_TIMER
enum {
TIMER_MODE_ONESHOT,
TIMER_MODE_PERIODIC,
};
typedef struct _machine_timer_obj_t {
mp_obj_base_t base;
nrfx_timer_t p_instance;
} machine_timer_obj_t;
STATIC mp_obj_t machine_timer_callbacks[] = {
NULL,
NULL,
NULL,
#if defined(NRF52_SERIES)
NULL,
NULL,
#endif
};
STATIC const machine_timer_obj_t machine_timer_obj[] = {
{{&machine_timer_type}, NRFX_TIMER_INSTANCE(0)},
#if MICROPY_PY_MACHINE_SOFT_PWM
{ },
#else
{{&machine_timer_type}, NRFX_TIMER_INSTANCE(1)},
#endif
{{&machine_timer_type}, NRFX_TIMER_INSTANCE(2)},
#if defined(NRF52_SERIES)
{{&machine_timer_type}, NRFX_TIMER_INSTANCE(3)},
{{&machine_timer_type}, NRFX_TIMER_INSTANCE(4)},
#endif
};
void timer_init0(void) {
for (int i = 0; i < MP_ARRAY_SIZE(machine_timer_obj); i++) {
nrfx_timer_uninit(&machine_timer_obj[i].p_instance);
}
}
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)) {
return timer_id;
}
mp_raise_ValueError(MP_ERROR_TEXT("Timer doesn't exist"));
}
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_instance.instance_id);
}
STATIC void timer_event_handler(nrf_timer_event_t event_type, void *p_context) {
machine_timer_obj_t *self = p_context;
mp_obj_t callback = machine_timer_callbacks[self->p_instance.instance_id];
if (callback != NULL) {
mp_call_function_1(callback, self);
}
}
/******************************************************************************/
/* 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) {
enum { ARG_id, ARG_period, ARG_mode, ARG_callback };
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 = 1000000} }, // 1 second
{ MP_QSTR_mode, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = TIMER_MODE_PERIODIC} },
{ 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[ARG_id].u_obj);
#if BLUETOOTH_SD
if (timer_id == 0) {
mp_raise_ValueError(MP_ERROR_TEXT("Timer reserved by Bluetooth LE stack"));
}
#endif
#if MICROPY_PY_MACHINE_SOFT_PWM
if (timer_id == 1) {
mp_raise_ValueError(MP_ERROR_TEXT("Timer reserved by ticker driver"));
}
#endif
machine_timer_obj_t *self = (machine_timer_obj_t*)&machine_timer_obj[timer_id];
if (mp_obj_is_fun(args[ARG_callback].u_obj)) {
machine_timer_callbacks[timer_id] = args[ARG_callback].u_obj;
} else if (args[ARG_callback].u_obj == mp_const_none) {
machine_timer_callbacks[timer_id] = NULL;
} else {
mp_raise_ValueError(MP_ERROR_TEXT("callback must be a function"));
}
// Timer peripheral usage:
// Every timer instance has a numer of capture/compare (CC) registers.
// These can store either the value to compare against (to trigger an
// interrupt or a shortcut) or store a value returned from a
// capture/compare event.
// We use channel 0 for comparing (to trigger the callback and clear
// shortcut) and channel 1 for capturing the current time.
const nrfx_timer_config_t config = {
.frequency = NRF_TIMER_FREQ_1MHz,
.mode = NRF_TIMER_MODE_TIMER,
.bit_width = NRF_TIMER_BIT_WIDTH_24,
#ifdef NRF51
.interrupt_priority = 3,
#else
.interrupt_priority = 6,
#endif
.p_context = self,
};
// Initialize the drive.
// When it is already initialized, this is a no-op.
nrfx_timer_init(&self->p_instance, &config, timer_event_handler);
// Configure channel 0.
nrf_timer_short_mask_t short_mask = NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK |
((args[ARG_mode].u_int == TIMER_MODE_ONESHOT) ? NRF_TIMER_SHORT_COMPARE0_STOP_MASK : 0);
bool enable_interrupts = true;
nrfx_timer_extended_compare(
&self->p_instance,
NRF_TIMER_CC_CHANNEL0,
args[ARG_period].u_int,
short_mask,
enable_interrupts);
return MP_OBJ_FROM_PTR(self);
}
/// \method period()
/// Return counter value, which is currently in us.
///
STATIC mp_obj_t machine_timer_period(mp_obj_t self_in) {
machine_timer_obj_t * self = MP_OBJ_TO_PTR(self_in);
uint32_t period = nrfx_timer_capture(&self->p_instance, NRF_TIMER_CC_CHANNEL1);
return MP_OBJ_NEW_SMALL_INT(period);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_timer_period_obj, machine_timer_period);
/// \method start()
/// 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);
nrfx_timer_enable(&self->p_instance);
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);
nrfx_timer_disable(&self->p_instance);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_timer_stop_obj, machine_timer_stop);
/// \method deinit()
/// Free resources associated with the timer.
///
STATIC mp_obj_t machine_timer_deinit(mp_obj_t self_in) {
machine_timer_obj_t * self = MP_OBJ_TO_PTR(self_in);
nrfx_timer_uninit(&self->p_instance);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_timer_deinit_obj, machine_timer_deinit);
STATIC const mp_rom_map_elem_t machine_timer_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_time), MP_ROM_PTR(&machine_timer_period_obj) }, // alias
{ MP_ROM_QSTR(MP_QSTR_period), MP_ROM_PTR(&machine_timer_period_obj) },
{ 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) },
{ MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&machine_timer_deinit_obj) },
// constants
{ MP_ROM_QSTR(MP_QSTR_ONESHOT), MP_ROM_INT(TIMER_MODE_ONESHOT) },
{ MP_ROM_QSTR(MP_QSTR_PERIODIC), MP_ROM_INT(TIMER_MODE_PERIODIC) },
};
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
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