Kevin Kent
/
XVHE_HID
IVSC Project
MCP4651.cpp
- Committer:
- kevinkent
- Date:
- 2012-11-14
- Revision:
- 1:82f2ef52759e
File content as of revision 1:82f2ef52759e:
/* mbed MCP4651 DigiPot Driver Library * * Copyright (c) 2012, Kevin Kent * * 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. */ #include "MCP4651.h" #include "mbed.h" /* Constructor, pin names for I2C and the I2C offset address of the device */ MCP4651::MCP4651(PinName sda, PinName scl, int addr) : _i2c(sda, scl) { _i2c.frequency(1000000); // Full I2C address = 0101b + A2:A1:A0:R/W _addr = MCP4651_BASE + (addr << 1); } /* Sets the value of the selected wiper */ int MCP4651::SetValue (int wiper, int value) { int reg; if (wiper == 0) {reg = MCP4651_VOL_WIPER0;} if (wiper == 1) {reg = MCP4651_VOL_WIPER1 << 4;} _write(reg, value); return(0); } // private functions for low level IO void MCP4651::_write(int reg, int data) { char args[2]; args[0] = reg; args[1] = data; _i2c.write(_addr, args,2); } int MCP4651::_read(int reg) { char args[2]; args[0] = reg; _i2c.write(_addr, args, 1); _i2c.read(_addr, args, 1); return(args[0]); }