Diff: MAX44009.cpp

Revision:

0:726b77a319d8

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MAX44009.cpp	Wed Aug 07 22:45:56 2013 +0000
@@ -0,0 +1,145 @@
+/*
+ * MAX44009 Ambient Light Sensor with ADC library
+ *
+ *
+ * Copyright (c) 2013 Davy Van Belle, MIT License
+ *
+ * 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.
+ */
+
+/** @file
+ * @brief MAX44009 I2C
+ */
+ 
+#include "mbed.h"
+#include "MAX44009.h"
+ 
+    /** init MAX44009 class
+     * @param *i2c pointer to I2C serial interface
+     * @param addr sensor I2C address
+     */
+    MAX44009::MAX44009 (I2C* i2c, char addr)
+    {
+        _i2c = i2c;
+        _addr = addr;
+    }
+
+    /** Set configuration register for the device
+     * @param config desired configuration register bits
+     * BIT 7 - CONT: 1 = continuous mode, 0 = single measurement
+     * BIT 6 - MANUAL: 1 = CDR, TIM[2:0] set by user, 0 = CDR, TIM[2:0] set by internal autorange
+     * BIT [5:4] - Not Used
+     * BIT 3 - CDR: 1 = Current divided by 8. (High-brightness), 0 = Current not divided.
+     * BIT [2:0] - TIM: Integration Time. See datasheet.
+     */
+     
+    void MAX44009::setConfig (char config)
+    {
+        char cmd[2];
+        cmd[0] = CONFIG;
+        cmd[1] = config;
+        _i2c->write(_addr,cmd,2);
+    }
+        
+    /** Get device INT_STATUS register
+     * BIT 0 : 0 = No interrupt event occurred, 1 = Ambient light intensity is outside the threshold range. 
+     */  
+    char MAX44009::getIntStatus()
+    {
+        char status;
+        char cmd = INT_STATUS;
+        _i2c->write(_addr,&cmd,1,true);
+        _i2c->read(_addr+1,&status,1);
+        return status;
+    }
+
+    /** Set device INT_ENABLE register
+     * @param Enable  BIT 0 : 0 = INT pin and INTS bit not effected if an interrupt event occurred, 1 = INT pin pulled low and INTS bit is set if interrupt occurred. /
+     */  
+    void MAX44009::setIntEnable(bool Enable)
+    {
+        char cmd[2];
+        cmd[0] = INT_ENABLE;
+        cmd[1] = 0x00 | Enable;
+        _i2c->write(_addr,cmd,2);
+    }
+
+    /** Get LUX reading from ADC
+     *
+     */
+    float MAX44009::getLUXReading()
+    {
+    char buff[2];
+    char cmd[2];
+    char expo,mant;
+    float lux;
+    
+    cmd[0] = LUX_HIGH_B;
+    cmd[1] = LUX_LOW_B;
+    
+    _i2c->write(_addr,&cmd[0],1,true);
+    _i2c->read(_addr+1,&buff[0],1,true);
+    _i2c->write(_addr,&cmd[1],1,true);
+    _i2c->read(_addr+1,&buff[1],1);
+    
+    expo = (buff[0] & 0xF0) >> 4;
+    mant = ((buff[0] & 0x0F) << 4) | (buff[1] & 0x0F) ;
+    
+    lux = pow((double)2,(double)expo) * mant * 0.045;
+    
+    return lux;
+    }
+    
+    /** Set upper threshold
+    * @param threshold set upper threshold value. Further info, see datasheet
+    */
+    void MAX44009::setUpperThres(char threshold)
+    {
+        char cmd[2];
+        cmd[0] = UP_THRESH_HIGH_B;
+        cmd[1] = threshold;
+        _i2c->write(_addr,cmd,2);
+    }
+    
+    /** Set lower threshold
+    * @param threshold set lower threshold value. Further info, see datasheet
+    */
+    void MAX44009::setLowerThres(char threshold)
+    {
+        char cmd[2];
+        cmd[0] = LOW_THRESH_HIGH_B;
+        cmd[1] = threshold;
+        _i2c->write(_addr,cmd,2);    
+    }
+    
+    /** Set Threshold time
+    * @param time set time to trigger interrupt if value is below or above threshold value. Further info, see datasheet
+    */
+    void MAX44009::setThresTimer(char time)
+    {
+        char cmd[2];
+        cmd[0] = THRESH_TIMER;
+        cmd[1] = time;
+        _i2c->write(_addr,cmd,2);       
+    }
+    
+    /*
+    float operator= (float d)
+    {
+        return this.getLUXReading();
+    }  
+    */
+    
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