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circuitpython/extmod/machine_signal.c

181 lines
6.1 KiB

/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2017 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 "py/mpconfig.h"
#if MICROPY_PY_MACHINE
#include <string.h>
#include "py/obj.h"
#include "py/runtime.h"
#include "extmod/virtpin.h"
#include "extmod/machine_signal.h"
// Signal class
typedef struct _machine_signal_t {
mp_obj_base_t base;
mp_obj_t pin;
bool invert;
} machine_signal_t;
STATIC mp_obj_t signal_make_new(const mp_obj_type_t *type, size_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
mp_obj_t pin = args[0];
bool invert = false;
#if defined(MICROPY_PY_MACHINE_PIN_MAKE_NEW)
mp_pin_p_t *pin_p = (mp_pin_t*)mp_proto_get(QSTR_pin_protocol, pin);
if (pin_p == NULL) {
// If first argument isn't a Pin-like object, we filter out "invert"
// from keyword arguments and pass them all to the exported Pin
// constructor to create one.
mp_obj_t *pin_args = mp_local_alloc((n_args + n_kw * 2) * sizeof(mp_obj_t));
memcpy(pin_args, args, n_args * sizeof(mp_obj_t));
const mp_obj_t *src = args + n_args;
mp_obj_t *dst = pin_args + n_args;
mp_obj_t *sig_value = NULL;
for (size_t cnt = n_kw; cnt; cnt--) {
if (*src == MP_OBJ_NEW_QSTR(MP_QSTR_invert)) {
invert = mp_obj_is_true(src[1]);
n_kw--;
} else {
*dst++ = *src;
*dst++ = src[1];
}
if (*src == MP_OBJ_NEW_QSTR(MP_QSTR_value)) {
// Value is pertained to Signal, so we should invert
// it for Pin if needed, and we should do it only when
// inversion status is guaranteedly known.
sig_value = dst - 1;
}
src += 2;
}
if (invert && sig_value != NULL) {
*sig_value = mp_obj_is_true(*sig_value) ? MP_OBJ_NEW_SMALL_INT(0) : MP_OBJ_NEW_SMALL_INT(1);
}
// Here we pass NULL as a type, hoping that mp_pin_make_new()
// will just ignore it as set a concrete type. If not, we'd need
// to expose port's "default" pin type too.
pin = MICROPY_PY_MACHINE_PIN_MAKE_NEW(NULL, n_args, n_kw, pin_args);
mp_local_free(pin_args);
}
else
#endif
// Otherwise there should be 1 or 2 args
{
if (n_args == 1) {
if (kw_args == NULL || kw_args->used == 0) {
} else if (kw_args->used == 1 && kw_args->table[0].key == MP_OBJ_NEW_QSTR(MP_QSTR_invert)) {
invert = mp_obj_is_true(kw_args->table[0].value);
} else {
goto error;
}
} else {
error:
mp_raise_TypeError(NULL);
}
}
machine_signal_t *o = m_new_obj(machine_signal_t);
o->base.type = type;
o->pin = pin;
o->invert = invert;
return MP_OBJ_FROM_PTR(o);
}
STATIC mp_uint_t signal_ioctl(mp_obj_t self_in, mp_uint_t request, uintptr_t arg, int *errcode) {
(void)errcode;
machine_signal_t *self = MP_OBJ_TO_PTR(self_in);
switch (request) {
case MP_PIN_READ: {
return mp_virtual_pin_read(self->pin) ^ self->invert;
}
case MP_PIN_WRITE: {
mp_virtual_pin_write(self->pin, arg ^ self->invert);
return 0;
}
}
return -1;
}
// fast method for getting/setting signal value
STATIC mp_obj_t signal_call(mp_obj_t self_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
mp_arg_check_num_kw_array(n_args, n_kw, 0, 1, false);
if (n_args == 0) {
// get pin
return MP_OBJ_NEW_SMALL_INT(mp_virtual_pin_read(self_in));
} else {
// set pin
mp_virtual_pin_write(self_in, mp_obj_is_true(args[0]));
return mp_const_none;
}
}
STATIC mp_obj_t signal_value(size_t n_args, const mp_obj_t *args) {
return signal_call(args[0], n_args - 1, 0, args + 1);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(signal_value_obj, 1, 2, signal_value);
STATIC mp_obj_t signal_on(mp_obj_t self_in) {
mp_virtual_pin_write(self_in, 1);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(signal_on_obj, signal_on);
STATIC mp_obj_t signal_off(mp_obj_t self_in) {
mp_virtual_pin_write(self_in, 0);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(signal_off_obj, signal_off);
STATIC const mp_rom_map_elem_t signal_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_value), MP_ROM_PTR(&signal_value_obj) },
{ MP_ROM_QSTR(MP_QSTR_on), MP_ROM_PTR(&signal_on_obj) },
{ MP_ROM_QSTR(MP_QSTR_off), MP_ROM_PTR(&signal_off_obj) },
};
STATIC MP_DEFINE_CONST_DICT(signal_locals_dict, signal_locals_dict_table);
STATIC const mp_pin_p_t signal_pin_p = {
MP_PROTO_IMPLEMENT(MP_QSTR_protocol_pin)
.ioctl = signal_ioctl,
};
const mp_obj_type_t machine_signal_type = {
{ &mp_type_type },
.name = MP_QSTR_Signal,
.make_new = signal_make_new,
.call = signal_call,
.protocol = &signal_pin_p,
.locals_dict = (void*)&signal_locals_dict,
};
#endif // MICROPY_PY_MACHINE