52 lines
1.9 KiB
C
52 lines
1.9 KiB
C
// Copyright (c) 2014 Adafruit Industries
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// Author: Tony DiCola
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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#ifndef COMMON_DHT_READ_H
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#define COMMON_DHT_READ_H
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#include <stdint.h>
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// Define errors and return values.
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#define DHT_ERROR_TIMEOUT -1
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#define DHT_ERROR_CHECKSUM -2
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#define DHT_ERROR_ARGUMENT -3
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#define DHT_ERROR_GPIO -4
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#define DHT_SUCCESS 0
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// Define sensor types.
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#define DHT11 11
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#define DHT22 22
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#define AM2302 22
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// Busy wait delay for most accurate timing, but high CPU usage.
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// Only use this for short periods of time (a few hundred milliseconds at most)!
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void busy_wait_milliseconds(uint32_t millis);
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// General delay that sleeps so CPU usage is low, but accuracy is potentially bad.
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void sleep_milliseconds(uint32_t millis);
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// Increase scheduling priority and algorithm to try to get 'real time' results.
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void set_max_priority(void);
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// Drop scheduling priority back to normal/default.
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void set_default_priority(void);
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#endif
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