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54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
/*
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* ultrasonic.h
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*
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* Copyright 2015 Edward V. Emelianov <eddy@sao.ru, edward.emelianoff@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#pragma once
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#ifndef __ULTRASONIC_H__
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#define __ULTRASONIC_H__
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#include <stdint.h>
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void tim2_init();
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int ultrasonic_get(uint32_t *L);
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void poll_ultrasonic();
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extern uint32_t last_us_val;
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// Sensor mode
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typedef enum{
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US_MODE_OFF // sensor is off
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,US_MODE_DONE // measurement done, ready for next
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,US_MODE_TRIG // sensor triggered
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,US_MODE_WAIT // wait for pulse
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,US_MODE_MEASUREMENT // measurement in process
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,US_MODE_READY // measurements done
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} usmode;
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// trigger time: after trigger event ends, timer will be configured for capture - 20us
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#define TRIG_T (200)
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// trigger length - 10us
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#define TRIG_L (10)
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// max length of measurement (to detect signal absence)
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#define MAX_MSRMNT_LEN (65535)
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// max difference of measured len for pass detection
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#define MAX_LEN_DIFF (300)
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// minimal length of signal in ms
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#define ULTRASONIC_TIMEOUT (10)
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#endif // __ULTRASONIC_H__
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