Reed Kimble / DacLtc2606

Simple wrapper object for LTC2606 1CH 16Bit DAC. Instantiate DacLtc2606 object instance passing reference to mbed.I2C object instance. Call write() method on DacLtc2606 instance passing 16Bit integer (0 [Off] to 32767/-32768 [Half-On] to -1 [Full-On]) to set DAC output.

DacLtc2606.cpp@2:d101ca4ae85e, 2012-09-14 (annotated)

Committer:
rkimble
Date:
Fri Sep 14 17:23:05 2012 +0000
Revision:
2:d101ca4ae85e
Parent:
1:5924632f3344 
Improved numeric type usage/refined code.

; Added local storage and retrieval of DAC output value.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rkimble 1:5924632f3344 1 /* Copyright (c) 2012 Reed Kimble, MIT License
rkimble 1:5924632f3344 2 *
rkimble 1:5924632f3344 3 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
rkimble 1:5924632f3344 4 * and associated documentation files (the "Software"), to deal in the Software without restriction,
rkimble 1:5924632f3344 5 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
rkimble 1:5924632f3344 6 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
rkimble 1:5924632f3344 7 * furnished to do so, subject to the following conditions:
rkimble 1:5924632f3344 8 *
rkimble 1:5924632f3344 9 * The above copyright notice and this permission notice shall be included in all copies or
rkimble 1:5924632f3344 10 * substantial portions of the Software.
rkimble 1:5924632f3344 11 *
rkimble 1:5924632f3344 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
rkimble 1:5924632f3344 13 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
rkimble 1:5924632f3344 14 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
rkimble 1:5924632f3344 15 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
rkimble 1:5924632f3344 16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
rkimble 1:5924632f3344 17 */
rkimble 1:5924632f3344 18
rkimble 1:5924632f3344 19 #include "DacLtc2606.h"
rkimble 1:5924632f3344 20 #include "mbed.h"
rkimble 1:5924632f3344 21
rkimble 1:5924632f3344 22 DacLtc2606::DacLtc2606(I2C i2c) : _i2c(i2c)
rkimble 1:5924632f3344 23 {
rkimble 2:d101ca4ae85e 24 _currentValue = 0;
rkimble 1:5924632f3344 25 }
rkimble 1:5924632f3344 26
rkimble 2:d101ca4ae85e 27 unsigned short DacLtc2606::getCurrentValue()
rkimble 2:d101ca4ae85e 28 {
rkimble 2:d101ca4ae85e 29 return _currentValue;
rkimble 2:d101ca4ae85e 30 }
rkimble 2:d101ca4ae85e 31
rkimble 2:d101ca4ae85e 32 bool DacLtc2606::write(unsigned short value)
rkimble 1:5924632f3344 33 {
rkimble 1:5924632f3344 34 int opR;
rkimble 1:5924632f3344 35 char args[3];
rkimble 1:5924632f3344 36 args[0] = _command;
rkimble 1:5924632f3344 37 args[1] = (value >> 8) & 0xFF;
rkimble 1:5924632f3344 38 args[2] = value & 0xFF;
rkimble 1:5924632f3344 39 opR = _i2c.write(_slave, args, 3, false);
rkimble 2:d101ca4ae85e 40 if(opR == 0) {_currentValue = value;}
rkimble 1:5924632f3344 41 return (opR == 0) ? true : false;
rkimble 1:5924632f3344 42 }
rkimble 1:5924632f3344 43
rkimble 1:5924632f3344 44 bool DacLtc2606::write(double percent)
rkimble 1:5924632f3344 45 {
rkimble 2:d101ca4ae85e 46 if(percent < 0.0) {percent = 0.0;}
rkimble 2:d101ca4ae85e 47 if(percent > 1.0) {percent = 1.0;}
rkimble 2:d101ca4ae85e 48 unsigned short value = 0;
rkimble 2:d101ca4ae85e 49 value = 65535 * percent;
rkimble 2:d101ca4ae85e 50 _currentValue = value;
rkimble 2:d101ca4ae85e 51 return write(value);
rkimble 0:896aaf4b80d0 52 }