Kevin Kent / Mbed 2 deprecated XVHE_HID

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Dependencies:   USBDevice mbed

MCP4661.cpp@0:960d250e49b2, 2012-05-17 (annotated)

Committer:
kevinkent
Date:
Thu May 17 23:11:08 2012 +0000
Revision:
0:960d250e49b2
got mcp working

;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kevinkent 0:960d250e49b2 1 /* mbed MCP4661 DigiPot Driver Library
kevinkent 0:960d250e49b2 2 *
kevinkent 0:960d250e49b2 3 * Copyright (c) 2012, Kevin Kent
kevinkent 0:960d250e49b2 4 *
kevinkent 0:960d250e49b2 5 * Permission is hereby granted, free of charge, to any person obtaining a copy
kevinkent 0:960d250e49b2 6 * of this software and associated documentation files (the "Software"), to deal
kevinkent 0:960d250e49b2 7 * in the Software without restriction, including without limitation the rights
kevinkent 0:960d250e49b2 8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
kevinkent 0:960d250e49b2 9 * copies of the Software, and to permit persons to whom the Software is
kevinkent 0:960d250e49b2 10 * furnished to do so, subject to the following conditions:
kevinkent 0:960d250e49b2 11 *
kevinkent 0:960d250e49b2 12 * The above copyright notice and this permission notice shall be included in
kevinkent 0:960d250e49b2 13 * all copies or substantial portions of the Software.
kevinkent 0:960d250e49b2 14 *
kevinkent 0:960d250e49b2 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
kevinkent 0:960d250e49b2 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
kevinkent 0:960d250e49b2 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
kevinkent 0:960d250e49b2 18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
kevinkent 0:960d250e49b2 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
kevinkent 0:960d250e49b2 20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
kevinkent 0:960d250e49b2 21 * THE SOFTWARE.
kevinkent 0:960d250e49b2 22 */
kevinkent 0:960d250e49b2 23
kevinkent 0:960d250e49b2 24
kevinkent 0:960d250e49b2 25 #include "MCP4661.h"
kevinkent 0:960d250e49b2 26 #include "mbed.h"
kevinkent 0:960d250e49b2 27
kevinkent 0:960d250e49b2 28 /*
kevinkent 0:960d250e49b2 29 Constructor, pin names for I2C and the I2C address of the device
kevinkent 0:960d250e49b2 30 */
kevinkent 0:960d250e49b2 31 MCP4661::MCP4661(PinName sda, PinName scl, int addr)
kevinkent 0:960d250e49b2 32 : _i2c(sda, scl) {
kevinkent 0:960d250e49b2 33
kevinkent 0:960d250e49b2 34 _i2c.frequency(1000000);
kevinkent 0:960d250e49b2 35
kevinkent 0:960d250e49b2 36 _addr = addr;
kevinkent 0:960d250e49b2 37
kevinkent 0:960d250e49b2 38 }
kevinkent 0:960d250e49b2 39
kevinkent 0:960d250e49b2 40
kevinkent 0:960d250e49b2 41 int MCP4661::SetValue (int wiper, int value) {
kevinkent 0:960d250e49b2 42 int reg;
kevinkent 0:960d250e49b2 43 if (wiper == 0) {reg = MCP4661_VOL_WIPER0;}
kevinkent 0:960d250e49b2 44 if (wiper == 1) {
kevinkent 0:960d250e49b2 45 reg = MCP4661_VOL_WIPER1;
kevinkent 0:960d250e49b2 46 reg = (reg << 4 );
kevinkent 0:960d250e49b2 47 }
kevinkent 0:960d250e49b2 48 reg |= MCP4661_WR;
kevinkent 0:960d250e49b2 49 _write(reg, value);
kevinkent 0:960d250e49b2 50 return(0);
kevinkent 0:960d250e49b2 51 }
kevinkent 0:960d250e49b2 52 int MCP4661::SetMode (int mask, int mode) {
kevinkent 0:960d250e49b2 53 if ( (mode < 0) || (mode > 3) ) {
kevinkent 0:960d250e49b2 54 return(1);
kevinkent 0:960d250e49b2 55 } else {
kevinkent 0:960d250e49b2 56 for (int i=0 ; i < 16 ; i++ ) {
kevinkent 0:960d250e49b2 57
kevinkent 0:960d250e49b2 58 // if this matches, set the LED to the mode
kevinkent 0:960d250e49b2 59 if (mask & (0x1 << i)) {
kevinkent 0:960d250e49b2 60 SetLed(i,mode);
kevinkent 0:960d250e49b2 61 }
kevinkent 0:960d250e49b2 62 }
kevinkent 0:960d250e49b2 63 }
kevinkent 0:960d250e49b2 64 return(0);
kevinkent 0:960d250e49b2 65 }
kevinkent 0:960d250e49b2 66
kevinkent 0:960d250e49b2 67
kevinkent 0:960d250e49b2 68
kevinkent 0:960d250e49b2 69 /*
kevinkent 0:960d250e49b2 70 led is in the range 0-15
kevinkent 0:960d250e49b2 71 mode is inthe range 0-3
kevinkent 0:960d250e49b2 72 */
kevinkent 0:960d250e49b2 73 int MCP4661::SetLed(int led, int mode) {
kevinkent 0:960d250e49b2 74
kevinkent 0:960d250e49b2 75 int reg = 0;
kevinkent 0:960d250e49b2 76 int offset = (led % 4);
kevinkent 0:960d250e49b2 77
kevinkent 0:960d250e49b2 78 printf("\nSetLed(%d,%d)\n", led, mode);
kevinkent 0:960d250e49b2 79
kevinkent 0:960d250e49b2 80 // makesure mode is within bounds
kevinkent 0:960d250e49b2 81 if ( (mode < 0) || (mode > 3) ) {
kevinkent 0:960d250e49b2 82 printf("Error : Invalid mode supplied\n");
kevinkent 0:960d250e49b2 83 return(1);
kevinkent 0:960d250e49b2 84 }
kevinkent 0:960d250e49b2 85
kevinkent 0:960d250e49b2 86 // determine which register this is,
kevinkent 0:960d250e49b2 87
kevinkent 0:960d250e49b2 88
kevinkent 0:960d250e49b2 89 // read the current status of the register
kevinkent 0:960d250e49b2 90 char regval = _read(reg);
kevinkent 0:960d250e49b2 91
kevinkent 0:960d250e49b2 92 // clear the two bit slice at the calculated offset
kevinkent 0:960d250e49b2 93 regval &= ~(0x3 << (2 * offset));
kevinkent 0:960d250e49b2 94
kevinkent 0:960d250e49b2 95 // now OR in the mode, shifted by 2*offset
kevinkent 0:960d250e49b2 96 regval |= (mode << (2 * offset));
kevinkent 0:960d250e49b2 97
kevinkent 0:960d250e49b2 98 // write the new value back
kevinkent 0:960d250e49b2 99 _write(reg, regval);
kevinkent 0:960d250e49b2 100
kevinkent 0:960d250e49b2 101 return(0);
kevinkent 0:960d250e49b2 102 }
kevinkent 0:960d250e49b2 103
kevinkent 0:960d250e49b2 104
kevinkent 0:960d250e49b2 105
kevinkent 0:960d250e49b2 106 // private functions for low level IO
kevinkent 0:960d250e49b2 107
kevinkent 0:960d250e49b2 108 void MCP4661::_write(int reg, int data) {
kevinkent 0:960d250e49b2 109 char args[2];
kevinkent 0:960d250e49b2 110 args[0] = reg;
kevinkent 0:960d250e49b2 111 args[1] = data;
kevinkent 0:960d250e49b2 112 _i2c.write(_addr, args,2);
kevinkent 0:960d250e49b2 113 }
kevinkent 0:960d250e49b2 114
kevinkent 0:960d250e49b2 115 int MCP4661::_read(int reg) {
kevinkent 0:960d250e49b2 116 char args[2];
kevinkent 0:960d250e49b2 117 args[0] = reg;
kevinkent 0:960d250e49b2 118 _i2c.write(_addr, args, 1);
kevinkent 0:960d250e49b2 119 _i2c.read(_addr, args, 1);
kevinkent 0:960d250e49b2 120 return(args[0]);
kevinkent 0:960d250e49b2 121 }
kevinkent 0:960d250e49b2 122
kevinkent 0:960d250e49b2 123
kevinkent 0:960d250e49b2 124
kevinkent 0:960d250e49b2 125
kevinkent 0:960d250e49b2 126