Kevin Kent / Mbed 2 deprecated XVHE_HID

IVSC Project

Dependencies:   USBDevice mbed

MCP4651.cpp@4:262764d24e4d, 2013-06-07 (annotated)

Committer:
kevinkent
Date:
Fri Jun 07 19:59:29 2013 +0000
Revision:
4:262764d24e4d
Parent:
1:82f2ef52759e 
Version 1.2

; Added MSG[0] = 0x06 tow write one pot chain with a single message

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kevinkent 1:82f2ef52759e 1 /* mbed MCP4651 DigiPot Driver Library
kevinkent 1:82f2ef52759e 2 *
kevinkent 1:82f2ef52759e 3 * Copyright (c) 2012, Kevin Kent
kevinkent 1:82f2ef52759e 4 *
kevinkent 1:82f2ef52759e 5 * Permission is hereby granted, free of charge, to any person obtaining a copy
kevinkent 1:82f2ef52759e 6 * of this software and associated documentation files (the "Software"), to deal
kevinkent 1:82f2ef52759e 7 * in the Software without restriction, including without limitation the rights
kevinkent 1:82f2ef52759e 8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
kevinkent 1:82f2ef52759e 9 * copies of the Software, and to permit persons to whom the Software is
kevinkent 1:82f2ef52759e 10 * furnished to do so, subject to the following conditions:
kevinkent 1:82f2ef52759e 11 *
kevinkent 1:82f2ef52759e 12 * The above copyright notice and this permission notice shall be included in
kevinkent 1:82f2ef52759e 13 * all copies or substantial portions of the Software.
kevinkent 1:82f2ef52759e 14 *
kevinkent 1:82f2ef52759e 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
kevinkent 1:82f2ef52759e 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
kevinkent 1:82f2ef52759e 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
kevinkent 1:82f2ef52759e 18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
kevinkent 1:82f2ef52759e 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
kevinkent 1:82f2ef52759e 20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
kevinkent 1:82f2ef52759e 21 * THE SOFTWARE.
kevinkent 1:82f2ef52759e 22 */
kevinkent 1:82f2ef52759e 23
kevinkent 1:82f2ef52759e 24
kevinkent 1:82f2ef52759e 25 #include "MCP4651.h"
kevinkent 1:82f2ef52759e 26 #include "mbed.h"
kevinkent 1:82f2ef52759e 27
kevinkent 1:82f2ef52759e 28 /*
kevinkent 1:82f2ef52759e 29 Constructor, pin names for I2C and the I2C offset address of the device
kevinkent 1:82f2ef52759e 30 */
kevinkent 1:82f2ef52759e 31 MCP4651::MCP4651(PinName sda, PinName scl, int addr)
kevinkent 1:82f2ef52759e 32 : _i2c(sda, scl) {
kevinkent 1:82f2ef52759e 33
kevinkent 1:82f2ef52759e 34 _i2c.frequency(1000000);
kevinkent 1:82f2ef52759e 35
kevinkent 1:82f2ef52759e 36 // Full I2C address = 0101b + A2:A1:A0:R/W
kevinkent 1:82f2ef52759e 37 _addr = MCP4651_BASE + (addr << 1);
kevinkent 1:82f2ef52759e 38
kevinkent 1:82f2ef52759e 39 }
kevinkent 1:82f2ef52759e 40
kevinkent 1:82f2ef52759e 41 /*
kevinkent 1:82f2ef52759e 42 Sets the value of the selected wiper
kevinkent 1:82f2ef52759e 43 */
kevinkent 1:82f2ef52759e 44
kevinkent 1:82f2ef52759e 45 int MCP4651::SetValue (int wiper, int value) {
kevinkent 1:82f2ef52759e 46 int reg;
kevinkent 1:82f2ef52759e 47 if (wiper == 0) {reg = MCP4651_VOL_WIPER0;}
kevinkent 1:82f2ef52759e 48 if (wiper == 1) {reg = MCP4651_VOL_WIPER1 << 4;}
kevinkent 1:82f2ef52759e 49
kevinkent 1:82f2ef52759e 50 _write(reg, value);
kevinkent 1:82f2ef52759e 51
kevinkent 1:82f2ef52759e 52 return(0);
kevinkent 1:82f2ef52759e 53 }
kevinkent 1:82f2ef52759e 54
kevinkent 1:82f2ef52759e 55
kevinkent 1:82f2ef52759e 56
kevinkent 1:82f2ef52759e 57
kevinkent 1:82f2ef52759e 58 // private functions for low level IO
kevinkent 1:82f2ef52759e 59
kevinkent 1:82f2ef52759e 60 void MCP4651::_write(int reg, int data) {
kevinkent 1:82f2ef52759e 61 char args[2];
kevinkent 1:82f2ef52759e 62 args[0] = reg;
kevinkent 1:82f2ef52759e 63 args[1] = data;
kevinkent 1:82f2ef52759e 64 _i2c.write(_addr, args,2);
kevinkent 1:82f2ef52759e 65 }
kevinkent 1:82f2ef52759e 66
kevinkent 1:82f2ef52759e 67 int MCP4651::_read(int reg) {
kevinkent 1:82f2ef52759e 68 char args[2];
kevinkent 1:82f2ef52759e 69 args[0] = reg;
kevinkent 1:82f2ef52759e 70 _i2c.write(_addr, args, 1);
kevinkent 1:82f2ef52759e 71 _i2c.read(_addr, args, 1);
kevinkent 1:82f2ef52759e 72 return(args[0]);
kevinkent 1:82f2ef52759e 73 }
kevinkent 1:82f2ef52759e 74
kevinkent 1:82f2ef52759e 75
kevinkent 1:82f2ef52759e 76
kevinkent 1:82f2ef52759e 77
kevinkent 1:82f2ef52759e 78