You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
65 lines
2.4 KiB
65 lines
2.4 KiB
/*
|
|
* This file is part of the MicroPython project, http://micropython.org/
|
|
*
|
|
* The MIT License (MIT)
|
|
*
|
|
* Copyright (c) 2016 Damien P. George
|
|
*
|
|
* 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/runtime.h"
|
|
#include "py/mperrno.h"
|
|
#include "extmod/modmachine.h"
|
|
|
|
#if MICROPY_PY_MACHINE_PULSE
|
|
|
|
MP_WEAK mp_uint_t machine_time_pulse_us(mp_hal_pin_obj_t pin, int pulse_level, mp_uint_t timeout_us) {
|
|
mp_uint_t start = mp_hal_ticks_us();
|
|
while (mp_hal_pin_read(pin) != pulse_level) {
|
|
if ((mp_uint_t)(mp_hal_ticks_us() - start) >= timeout_us) {
|
|
return (mp_uint_t)-2;
|
|
}
|
|
}
|
|
start = mp_hal_ticks_us();
|
|
while (mp_hal_pin_read(pin) == pulse_level) {
|
|
if ((mp_uint_t)(mp_hal_ticks_us() - start) >= timeout_us) {
|
|
return (mp_uint_t)-1;
|
|
}
|
|
}
|
|
return mp_hal_ticks_us() - start;
|
|
}
|
|
|
|
static mp_obj_t machine_time_pulse_us_(size_t n_args, const mp_obj_t *args) {
|
|
mp_hal_pin_obj_t pin = mp_hal_get_pin_obj(args[0]);
|
|
int level = 0;
|
|
if (mp_obj_is_true(args[1])) {
|
|
level = 1;
|
|
}
|
|
mp_uint_t timeout_us = 1000000;
|
|
if (n_args > 2) {
|
|
timeout_us = mp_obj_get_int(args[2]);
|
|
}
|
|
mp_uint_t us = machine_time_pulse_us(pin, level, timeout_us);
|
|
// May return -1 or -2 in case of timeout
|
|
return mp_obj_new_int(us);
|
|
}
|
|
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_time_pulse_us_obj, 2, 3, machine_time_pulse_us_);
|
|
|
|
#endif
|
|
|