circuitpython/esp8266/modonewire.c

122 lines
4.5 KiB
C

/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2015 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 <stdio.h>
#include <stdint.h>
#include "py/obj.h"
#include "py/mphal.h"
#include "modmachine.h"
#include "esponewire.h"
STATIC mp_obj_t onewire_timings(mp_obj_t timings_in) {
mp_obj_t *items;
mp_obj_get_array_fixed_n(timings_in, 9, &items);
for (int i = 0; i < 9; ++i) {
esp_onewire_timings[i] = mp_obj_get_int(items[i]);
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(onewire_timings_obj, onewire_timings);
STATIC mp_obj_t onewire_reset(mp_obj_t pin_in) {
return mp_obj_new_bool(esp_onewire_reset(mp_obj_get_pin(pin_in)));
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(onewire_reset_obj, onewire_reset);
STATIC mp_obj_t onewire_readbit(mp_obj_t pin_in) {
return MP_OBJ_NEW_SMALL_INT(esp_onewire_readbit(mp_obj_get_pin(pin_in)));
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(onewire_readbit_obj, onewire_readbit);
STATIC mp_obj_t onewire_readbyte(mp_obj_t pin_in) {
uint pin = mp_obj_get_pin(pin_in);
uint8_t value = 0;
for (int i = 0; i < 8; ++i) {
value |= esp_onewire_readbit(pin) << i;
}
return MP_OBJ_NEW_SMALL_INT(value);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(onewire_readbyte_obj, onewire_readbyte);
STATIC mp_obj_t onewire_writebit(mp_obj_t pin_in, mp_obj_t value_in) {
esp_onewire_writebit(mp_obj_get_pin(pin_in), mp_obj_get_int(value_in));
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(onewire_writebit_obj, onewire_writebit);
STATIC mp_obj_t onewire_writebyte(mp_obj_t pin_in, mp_obj_t value_in) {
uint pin = mp_obj_get_pin(pin_in);
int value = mp_obj_get_int(value_in);
for (int i = 0; i < 8; ++i) {
esp_onewire_writebit(pin, value & 1);
value >>= 1;
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(onewire_writebyte_obj, onewire_writebyte);
STATIC mp_obj_t onewire_crc8(mp_obj_t data) {
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(data, &bufinfo, MP_BUFFER_READ);
uint8_t crc = 0;
for (size_t i = 0; i < bufinfo.len; ++i) {
uint8_t byte = ((uint8_t*)bufinfo.buf)[i];
for (int b = 0; b < 8; ++b) {
uint8_t fb_bit = (crc ^ byte) & 0x01;
if (fb_bit == 0x01) {
crc = crc ^ 0x18;
}
crc = (crc >> 1) & 0x7f;
if (fb_bit == 0x01) {
crc = crc | 0x80;
}
byte = byte >> 1;
}
}
return MP_OBJ_NEW_SMALL_INT(crc);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(onewire_crc8_obj, onewire_crc8);
STATIC const mp_map_elem_t onewire_module_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_onewire) },
{ MP_ROM_QSTR(MP_QSTR_timings), MP_ROM_PTR((mp_obj_t)&onewire_timings_obj) },
{ MP_ROM_QSTR(MP_QSTR_reset), MP_ROM_PTR((mp_obj_t)&onewire_reset_obj) },
{ MP_ROM_QSTR(MP_QSTR_readbit), MP_ROM_PTR((mp_obj_t)&onewire_readbit_obj) },
{ MP_ROM_QSTR(MP_QSTR_readbyte), MP_ROM_PTR((mp_obj_t)&onewire_readbyte_obj) },
{ MP_ROM_QSTR(MP_QSTR_writebit), MP_ROM_PTR((mp_obj_t)&onewire_writebit_obj) },
{ MP_ROM_QSTR(MP_QSTR_writebyte), MP_ROM_PTR((mp_obj_t)&onewire_writebyte_obj) },
{ MP_ROM_QSTR(MP_QSTR_crc8), MP_ROM_PTR((mp_obj_t)&onewire_crc8_obj) },
};
STATIC MP_DEFINE_CONST_DICT(onewire_module_globals, onewire_module_globals_table);
const mp_obj_module_t onewire_module = {
.base = { &mp_type_module },
.globals = (mp_obj_dict_t*)&onewire_module_globals,
};