HIH6130.cpp

00001 /* Copyright (c) 2010-2011 mbed.org, MIT License
00002 *
00003 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
00004 * and associated documentation files (the "Software"), to deal in the Software without
00005 * restriction, including without limitation the rights to use, copy, modify, merge, publish,
00006 * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
00007 * Software is furnished to do so, subject to the following conditions:
00008 *
00009 * The above copyright notice and this permission notice shall be included in all copies or
00010 * substantial portions of the Software.
00011 *
00012 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
00013 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00014 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
00015 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00016 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00017 */
00018 
00019 #include "HIH6130.h"
00020 
00021 HIH6130::HIH6130(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr<<1) {
00022     // activate the peripheral
00023 }
00024 
00025 HIH6130::~HIH6130() { }
00026 
00027 void HIH6130::measure(void)
00028 {
00029     m_i2c.start() ;
00030     m_i2c.write(m_addr) ;
00031     m_i2c.stop() ;
00032 }
00033 
00034 /**
00035  * start Command Mode
00036  *
00037  * @param none
00038  * @returns none
00039  *
00040  * @note this must be called within 3ms or 10ms 
00041  * @note after Power On
00042  */
00043 void HIH6130::start_CM(void)
00044 {
00045     uint8_t data[3] = { 0xA0, 0x00, 0x00 } ;
00046     m_i2c.write(m_addr, (char *)data, 3);
00047 }
00048 
00049 /**
00050  * Ends Command Mode and enter Normal Operation Mode
00051  *
00052  * @param none
00053  * @returns none
00054  *
00055  * @note only valid in Command Mode
00056  */
00057 void HIH6130::start_NOM(void)
00058 {
00059     uint8_t data[3] = { 0x80, 0x00, 0x00 } ;
00060     m_i2c.write(m_addr, (char *)data, 3);
00061 }
00062 
00063 uint16_t HIH6130::getValue(float *humidity, float *temperature)
00064 {
00065     uint16_t status = 0 ;
00066     uint8_t data[4] ;
00067     data[0] = 0x00 ;
00068     readRegs(0, data, 4) ;
00069 
00070     status = (data[0] >> 6) & 0x03 ;
00071     *humidity = (float)((data[0] & 0x3F) * 256 + data[1]) * 100.0 / (float)0x3FFF ;
00072     *temperature = (float)((data[2] * 64) + (data[3] >> 2)) * 165.0 / (float)0x3FFF - 40.0 ;
00073     return( status ) ;
00074 }
00075 
00076 void HIH6130::readRegs(int addr, uint8_t * data, int len) {
00077     char t[1] = {addr};
00078     m_i2c.write(m_addr, t, 1, true);
00079     m_i2c.read(m_addr, (char *)data, len);
00080 }
00081 
00082 void HIH6130::writeRegs(uint8_t * data, int len) {
00083     m_i2c.write(m_addr, (char *)data, len);
00084 }