247 lines
8.2 KiB
C
247 lines
8.2 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2016 Glenn Ruben Bakke
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "py/nlr.h"
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#include "py/runtime.h"
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#include "timer.h"
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#include "nrfx_timer.h"
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#if MICROPY_PY_MACHINE_TIMER_NRF
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enum {
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TIMER_MODE_ONESHOT,
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TIMER_MODE_PERIODIC,
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};
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typedef struct _machine_timer_obj_t {
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mp_obj_base_t base;
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nrfx_timer_t p_instance;
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} machine_timer_obj_t;
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STATIC mp_obj_t machine_timer_callbacks[] = {
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NULL,
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NULL,
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NULL,
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#if defined(NRF52_SERIES)
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NULL,
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NULL,
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#endif
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};
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STATIC const machine_timer_obj_t machine_timer_obj[] = {
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{{&machine_timer_type}, NRFX_TIMER_INSTANCE(0)},
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#if MICROPY_PY_MACHINE_SOFT_PWM
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{ },
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#else
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{{&machine_timer_type}, NRFX_TIMER_INSTANCE(1)},
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#endif
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{{&machine_timer_type}, NRFX_TIMER_INSTANCE(2)},
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#if defined(NRF52_SERIES)
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{{&machine_timer_type}, NRFX_TIMER_INSTANCE(3)},
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{{&machine_timer_type}, NRFX_TIMER_INSTANCE(4)},
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#endif
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};
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void timer_init0(void) {
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for (int i = 0; i < MP_ARRAY_SIZE(machine_timer_obj); i++) {
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nrfx_timer_uninit(&machine_timer_obj[i].p_instance);
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}
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}
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STATIC int timer_find(mp_obj_t id) {
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// given an integer id
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int timer_id = mp_obj_get_int(id);
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if (timer_id >= 0 && timer_id < MP_ARRAY_SIZE(machine_timer_obj)) {
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return timer_id;
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}
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mp_raise_ValueError(MP_ERROR_TEXT("Timer doesn't exist"));
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}
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STATIC void timer_print(const mp_print_t *print, mp_obj_t o, mp_print_kind_t kind) {
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machine_timer_obj_t *self = o;
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mp_printf(print, "Timer(%u)", self->p_instance.instance_id);
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}
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STATIC void timer_event_handler(nrf_timer_event_t event_type, void *p_context) {
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machine_timer_obj_t *self = p_context;
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mp_obj_t callback = machine_timer_callbacks[self->p_instance.instance_id];
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if (callback != NULL) {
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mp_call_function_1(callback, self);
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}
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}
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/******************************************************************************/
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/* MicroPython bindings for machine API */
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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) {
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enum { ARG_id, ARG_period, ARG_mode, ARG_callback };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_id, MP_ARG_OBJ, {.u_obj = MP_OBJ_NEW_SMALL_INT(-1)} },
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{ MP_QSTR_period, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 1000000} }, // 1 second
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{ MP_QSTR_mode, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = TIMER_MODE_PERIODIC} },
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{ MP_QSTR_callback, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
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};
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// parse args
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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// get static peripheral object
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int timer_id = timer_find(args[ARG_id].u_obj);
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#if BLUETOOTH_SD
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if (timer_id == 0) {
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mp_raise_ValueError(MP_ERROR_TEXT("Timer reserved by Bluetooth LE stack"));
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}
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#endif
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#if MICROPY_PY_MACHINE_SOFT_PWM
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if (timer_id == 1) {
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mp_raise_ValueError(MP_ERROR_TEXT("Timer reserved by ticker driver"));
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}
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#endif
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machine_timer_obj_t *self = (machine_timer_obj_t*)&machine_timer_obj[timer_id];
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if (mp_obj_is_fun(args[ARG_callback].u_obj)) {
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machine_timer_callbacks[timer_id] = args[ARG_callback].u_obj;
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} else if (args[ARG_callback].u_obj == mp_const_none) {
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machine_timer_callbacks[timer_id] = NULL;
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} else {
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mp_raise_ValueError(MP_ERROR_TEXT("callback must be a function"));
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}
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// Timer peripheral usage:
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// Every timer instance has a number of capture/compare (CC) registers.
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// These can store either the value to compare against (to trigger an
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// interrupt or a shortcut) or store a value returned from a
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// capture/compare event.
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// We use channel 0 for comparing (to trigger the callback and clear
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// shortcut) and channel 1 for capturing the current time.
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const nrfx_timer_config_t config = {
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.frequency = NRF_TIMER_FREQ_1MHz,
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.mode = NRF_TIMER_MODE_TIMER,
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.bit_width = NRF_TIMER_BIT_WIDTH_24,
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#ifdef NRF51
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.interrupt_priority = 3,
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#else
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.interrupt_priority = 6,
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#endif
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.p_context = self,
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};
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// Initialize the drive.
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// When it is already initialized, this is a no-op.
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nrfx_timer_init(&self->p_instance, &config, timer_event_handler);
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// Configure channel 0.
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nrf_timer_short_mask_t short_mask = NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK |
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((args[ARG_mode].u_int == TIMER_MODE_ONESHOT) ? NRF_TIMER_SHORT_COMPARE0_STOP_MASK : 0);
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bool enable_interrupts = true;
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nrfx_timer_extended_compare(
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&self->p_instance,
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NRF_TIMER_CC_CHANNEL0,
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args[ARG_period].u_int,
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short_mask,
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enable_interrupts);
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return MP_OBJ_FROM_PTR(self);
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}
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/// \method period()
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/// Return counter value, which is currently in us.
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///
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STATIC mp_obj_t machine_timer_period(mp_obj_t self_in) {
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machine_timer_obj_t * self = MP_OBJ_TO_PTR(self_in);
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uint32_t period = nrfx_timer_capture(&self->p_instance, NRF_TIMER_CC_CHANNEL1);
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return MP_OBJ_NEW_SMALL_INT(period);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_timer_period_obj, machine_timer_period);
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/// \method start()
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/// Start the timer.
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///
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STATIC mp_obj_t machine_timer_start(mp_obj_t self_in) {
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machine_timer_obj_t * self = MP_OBJ_TO_PTR(self_in);
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nrfx_timer_enable(&self->p_instance);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_timer_start_obj, machine_timer_start);
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/// \method stop()
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/// Stop the timer.
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///
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STATIC mp_obj_t machine_timer_stop(mp_obj_t self_in) {
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machine_timer_obj_t * self = MP_OBJ_TO_PTR(self_in);
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nrfx_timer_disable(&self->p_instance);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_timer_stop_obj, machine_timer_stop);
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/// \method deinit()
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/// Free resources associated with the timer.
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///
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STATIC mp_obj_t machine_timer_deinit(mp_obj_t self_in) {
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machine_timer_obj_t * self = MP_OBJ_TO_PTR(self_in);
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nrfx_timer_uninit(&self->p_instance);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_timer_deinit_obj, machine_timer_deinit);
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STATIC const mp_rom_map_elem_t machine_timer_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR_time), MP_ROM_PTR(&machine_timer_period_obj) }, // alias
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{ MP_ROM_QSTR(MP_QSTR_period), MP_ROM_PTR(&machine_timer_period_obj) },
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{ MP_ROM_QSTR(MP_QSTR_start), MP_ROM_PTR(&machine_timer_start_obj) },
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{ MP_ROM_QSTR(MP_QSTR_stop), MP_ROM_PTR(&machine_timer_stop_obj) },
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{ MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&machine_timer_deinit_obj) },
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// constants
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{ MP_ROM_QSTR(MP_QSTR_ONESHOT), MP_ROM_INT(TIMER_MODE_ONESHOT) },
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{ MP_ROM_QSTR(MP_QSTR_PERIODIC), MP_ROM_INT(TIMER_MODE_PERIODIC) },
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};
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STATIC MP_DEFINE_CONST_DICT(machine_timer_locals_dict, machine_timer_locals_dict_table);
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MP_DEFINE_CONST_OBJ_TYPE(
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machine_timer_type,
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MP_QSTR_Timer,
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MP_TYPE_FLAG_NONE,
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make_new, machine_timer_make_new,
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print, timer_print,
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locals_dict, &machine_timer_locals_dict
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);
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#endif // MICROPY_PY_MACHINE_TIMER_NRF
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