diff options
Diffstat (limited to 'drivers/dht/dht.c')
| -rw-r--r-- | drivers/dht/dht.c | 89 |
1 files changed, 0 insertions, 89 deletions
diff --git a/drivers/dht/dht.c b/drivers/dht/dht.c deleted file mode 100644 index 5d92ae39a..000000000 --- a/drivers/dht/dht.c +++ /dev/null @@ -1,89 +0,0 @@ -/* - * 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 <stdio.h> - -#include "py/runtime.h" -#include "py/mperrno.h" -#include "py/mphal.h" -#include "extmod/machine_pulse.h" -#include "drivers/dht/dht.h" - -STATIC mp_obj_t dht_readinto(mp_obj_t pin_in, mp_obj_t buf_in) { - mp_hal_pin_obj_t pin = mp_hal_get_pin_obj(pin_in); - mp_hal_pin_open_drain(pin); - - mp_buffer_info_t bufinfo; - mp_get_buffer_raise(buf_in, &bufinfo, MP_BUFFER_WRITE); - - if (bufinfo.len < 5) { - mp_raise_ValueError("buffer too small"); - } - - // issue start command - mp_hal_pin_od_high(pin); - mp_hal_delay_ms(250); - mp_hal_pin_od_low(pin); - mp_hal_delay_ms(18); - - mp_uint_t irq_state = mp_hal_quiet_timing_enter(); - - // release the line so the device can respond - mp_hal_pin_od_high(pin); - mp_hal_delay_us_fast(10); - - // wait for device to respond - mp_uint_t ticks = mp_hal_ticks_us(); - while (mp_hal_pin_read(pin) != 0) { - if ((mp_uint_t)(mp_hal_ticks_us() - ticks) > 100) { - goto timeout; - } - } - - // time pulse, should be 80us - ticks = machine_time_pulse_us(pin, 1, 150); - if ((mp_int_t)ticks < 0) { - goto timeout; - } - - // time 40 pulses for data (either 26us or 70us) - uint8_t *buf = bufinfo.buf; - for (int i = 0; i < 40; ++i) { - ticks = machine_time_pulse_us(pin, 1, 100); - if ((mp_int_t)ticks < 0) { - goto timeout; - } - buf[i / 8] = (buf[i / 8] << 1) | (ticks > 48); - } - - mp_hal_quiet_timing_exit(irq_state); - return mp_const_none; - -timeout: - mp_hal_quiet_timing_exit(irq_state); - mp_raise_OSError(MP_ETIMEDOUT); -} -MP_DEFINE_CONST_FUN_OBJ_2(dht_readinto_obj, dht_readinto); |
