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micropython/ports/esp32/machine_timer.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* Development of the code in this file was sponsored by Microbric Pty Ltd
*
* The MIT License (MIT)
*
* Copyright (c) 2013-2015 Damien P. George
* Copyright (c) 2016 Paul Sokolovsky
*
* 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 "py/obj.h"
#include "py/runtime.h"
#include "modmachine.h"
#include "mphalport.h"
#include "driver/timer.h"
#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(4, 1, 1)
#include "hal/timer_ll.h"
#define HAVE_TIMER_LL (1)
#endif
#define TIMER_INTR_SEL TIMER_INTR_LEVEL
#define TIMER_DIVIDER 8
// TIMER_BASE_CLK is normally 80MHz. TIMER_DIVIDER ought to divide this exactly
#define TIMER_SCALE (TIMER_BASE_CLK / TIMER_DIVIDER)
#define TIMER_FLAGS 0
typedef struct _machine_timer_obj_t {
mp_obj_base_t base;
mp_uint_t group;
mp_uint_t index;
mp_uint_t repeat;
// ESP32 timers are 64-bit
uint64_t period;
mp_obj_t callback;
intr_handle_t handle;
struct _machine_timer_obj_t *next;
} machine_timer_obj_t;
const mp_obj_type_t machine_timer_type;
STATIC void machine_timer_disable(machine_timer_obj_t *self);
void machine_timer_deinit_all(void) {
// Disable, deallocate and remove all timers from list
machine_timer_obj_t **t = &MP_STATE_PORT(machine_timer_obj_head);
while (*t != NULL) {
machine_timer_disable(*t);
machine_timer_obj_t *next = (*t)->next;
m_del_obj(machine_timer_obj_t, *t);
*t = next;
}
}
STATIC void machine_timer_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
machine_timer_obj_t *self = self_in;
timer_config_t config;
mp_printf(print, "Timer(%p; ", self);
timer_get_config(self->group, self->index, &config);
mp_printf(print, "alarm_en=%d, ", config.alarm_en);
mp_printf(print, "auto_reload=%d, ", config.auto_reload);
mp_printf(print, "counter_en=%d)", config.counter_en);
}
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 *args) {
mp_arg_check_num(n_args, n_kw, 1, 1, false);
mp_uint_t group = (mp_obj_get_int(args[0]) >> 1) & 1;
mp_uint_t index = mp_obj_get_int(args[0]) & 1;
// Check whether the timer is already initialized, if so return it
for (machine_timer_obj_t *t = MP_STATE_PORT(machine_timer_obj_head); t; t = t->next) {
if (t->group == group && t->index == index) {
return t;
}
}
machine_timer_obj_t *self = mp_obj_malloc(machine_timer_obj_t, &machine_timer_type);
self->group = group;
self->index = index;
// Add the timer to the linked-list of timers
self->next = MP_STATE_PORT(machine_timer_obj_head);
MP_STATE_PORT(machine_timer_obj_head) = self;
return self;
}
STATIC void machine_timer_disable(machine_timer_obj_t *self) {
if (self->handle) {
timer_pause(self->group, self->index);
esp_intr_free(self->handle);
self->handle = NULL;
}
// We let the disabled timer stay in the list, as it might be
// referenced elsewhere
}
STATIC void machine_timer_isr(void *self_in) {
machine_timer_obj_t *self = self_in;
timg_dev_t *device = self->group ? &(TIMERG1) : &(TIMERG0);
#if HAVE_TIMER_LL
#if CONFIG_IDF_TARGET_ESP32 && ESP_IDF_VERSION < ESP_IDF_VERSION_VAL(5, 0, 0)
device->hw_timer[self->index].update = 1;
#else
#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(4, 4, 0)
#if CONFIG_IDF_TARGET_ESP32S3
device->hw_timer[self->index].update.tn_update = 1;
#else
device->hw_timer[self->index].update.tx_update = 1;
#endif
#else
device->hw_timer[self->index].update.update = 1;
#endif
#endif
timer_ll_clear_intr_status(device, self->index);
#if ESP_IDF_VERSION < ESP_IDF_VERSION_VAL(5, 0, 0)
timer_ll_set_alarm_enable(device, self->index, self->repeat);
#else
timer_ll_set_alarm_value(device, self->index, self->repeat);
#endif
#else
device->hw_timer[self->index].update = 1;
if (self->index) {
device->int_clr_timers.t1 = 1;
} else {
device->int_clr_timers.t0 = 1;
}
device->hw_timer[self->index].config.alarm_en = self->repeat;
#endif
mp_sched_schedule(self->callback, self);
mp_hal_wake_main_task_from_isr();
}
STATIC void machine_timer_enable(machine_timer_obj_t *self) {
timer_config_t config;
config.alarm_en = TIMER_ALARM_EN;
config.auto_reload = self->repeat;
config.counter_dir = TIMER_COUNT_UP;
config.divider = TIMER_DIVIDER;
config.intr_type = TIMER_INTR_LEVEL;
config.counter_en = TIMER_PAUSE;
check_esp_err(timer_init(self->group, self->index, &config));
check_esp_err(timer_set_counter_value(self->group, self->index, 0x00000000));
check_esp_err(timer_set_alarm_value(self->group, self->index, self->period));
check_esp_err(timer_enable_intr(self->group, self->index));
check_esp_err(timer_isr_register(self->group, self->index, machine_timer_isr, (void *)self, TIMER_FLAGS, &self->handle));
check_esp_err(timer_start(self->group, self->index));
}
STATIC mp_obj_t machine_timer_init_helper(machine_timer_obj_t *self, mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
enum {
ARG_mode,
ARG_callback,
ARG_period,
ARG_tick_hz,
ARG_freq,
};
static const mp_arg_t allowed_args[] = {
{ 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} },
{ MP_QSTR_period, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0xffffffff} },
{ MP_QSTR_tick_hz, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 1000} },
#if MICROPY_PY_BUILTINS_FLOAT
{ MP_QSTR_freq, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
#else
{ MP_QSTR_freq, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0xffffffff} },
#endif
};
machine_timer_disable(self);
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
#if MICROPY_PY_BUILTINS_FLOAT
if (args[ARG_freq].u_obj != mp_const_none) {
self->period = (uint64_t)(TIMER_SCALE / mp_obj_get_float(args[ARG_freq].u_obj));
}
#else
if (args[ARG_freq].u_int != 0xffffffff) {
self->period = TIMER_SCALE / ((uint64_t)args[ARG_freq].u_int);
}
#endif
else {
self->period = (((uint64_t)args[ARG_period].u_int) * TIMER_SCALE) / args[ARG_tick_hz].u_int;
}
self->repeat = args[ARG_mode].u_int;
self->callback = args[ARG_callback].u_obj;
self->handle = NULL;
machine_timer_enable(self);
return mp_const_none;
}
STATIC mp_obj_t machine_timer_deinit(mp_obj_t self_in) {
machine_timer_disable(self_in);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_timer_deinit_obj, machine_timer_deinit);
STATIC mp_obj_t machine_timer_init(size_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
return machine_timer_init_helper(args[0], n_args - 1, args + 1, kw_args);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(machine_timer_init_obj, 1, machine_timer_init);
STATIC mp_obj_t machine_timer_value(mp_obj_t self_in) {
machine_timer_obj_t *self = self_in;
double result;
timer_get_counter_time_sec(self->group, self->index, &result);
return MP_OBJ_NEW_SMALL_INT((mp_uint_t)(result * 1000)); // value in ms
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_timer_value_obj, machine_timer_value);
STATIC const mp_rom_map_elem_t machine_timer_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR___del__), MP_ROM_PTR(&machine_timer_deinit_obj) },
{ MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&machine_timer_deinit_obj) },
{ MP_ROM_QSTR(MP_QSTR_init), MP_ROM_PTR(&machine_timer_init_obj) },
{ MP_ROM_QSTR(MP_QSTR_value), MP_ROM_PTR(&machine_timer_value_obj) },
{ MP_ROM_QSTR(MP_QSTR_ONE_SHOT), MP_ROM_INT(false) },
{ MP_ROM_QSTR(MP_QSTR_PERIODIC), MP_ROM_INT(true) },
};
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 = machine_timer_print,
.make_new = machine_timer_make_new,
.locals_dict = (mp_obj_t)&machine_timer_locals_dict,
};
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