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Diffstat (limited to 'extmod/machine_signal.c')
| -rw-r--r-- | extmod/machine_signal.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/extmod/machine_signal.c b/extmod/machine_signal.c new file mode 100644 index 0000000000..d089312962 --- /dev/null +++ b/extmod/machine_signal.c @@ -0,0 +1,183 @@ +/* + * 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, size_t n_kw, const mp_obj_t *args) { + mp_obj_t pin = args[0]; + bool invert = false; + + #if defined(MICROPY_PY_MACHINE_PIN_MAKE_NEW) + mp_pin_p_t *pin_p = NULL; + + if (MP_OBJ_IS_OBJ(pin)) { + mp_obj_base_t *pin_base = (mp_obj_base_t*)MP_OBJ_TO_PTR(args[0]); + pin_p = (mp_pin_p_t*)pin_base->type->protocol; + } + + 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[n_args + n_kw * 2]; + 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); + } + else + #endif + // Otherwise there should be 1 or 2 args + { + if (n_args == 1) { + if (n_kw == 0) { + } else if (n_kw == 1 && args[1] == MP_OBJ_NEW_QSTR(MP_QSTR_invert)) { + invert = mp_obj_is_true(args[1]); + } 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(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 = { + .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 |