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60 lines
1.5 KiB
C++
60 lines
1.5 KiB
C++
#include "AM2320.h"
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#include <Wire.h>
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//
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// AM2321 Temperature & Humidity Sensor library for Arduino
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// Сделана Тимофеевым Е.Н. из AM2320-master
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unsigned int CRC16(uint8_t *ptr, uint8_t length)
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{
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unsigned int crc = 0xFFFF;
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uint8_t s = 0x00;
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while(length--) {
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crc ^= *ptr++;
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for(s = 0; s < 8; s++) {
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if((crc & 0x01) != 0) {
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crc >>= 1;
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crc ^= 0xA001;
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} else crc >>= 1;
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}
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}
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return crc;
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}
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AM2320::AM2320()
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{
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}
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int AM2320::Read()
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{
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uint8_t buf[8];
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for(int s = 0; s < 8; s++) buf[s] = 0x00;
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Wire.beginTransmission(AM2320_address);
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Wire.endTransmission();
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// запрос 4 байт (температуры и влажности)
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Wire.beginTransmission(AM2320_address);
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Wire.write(0x03);// запрос
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Wire.write(0x00); // с 0-го адреса
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Wire.write(0x04); // 4 байта
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if (Wire.endTransmission(true) != 0) return 1;
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delayMicroseconds(1600); //>1.5ms
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// считываем результаты запроса
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Wire.requestFrom(AM2320_address, 0x08);
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for (int i = 0; i < 0x08; i++) buf[i] = Wire.read();
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// CRC check
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unsigned int Rcrc = buf[7] << 8;
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Rcrc += buf[6];
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if (Rcrc == CRC16(buf, 6)) {
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unsigned int temperature = ((buf[4] & 0x7F) << 8) + buf[5];
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t = temperature / 10.0;
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t = ((buf[4] & 0x80) >> 7) == 1 ? t * (-1) : t;
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unsigned int humidity = (buf[2] << 8) + buf[3];
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h = humidity / 10.0;
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return 0;
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}
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return 2;
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}
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