Kevin Kent / Mbed 2 deprecated XVHE_HID

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Dependencies:   USBDevice mbed

PCA9532.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 PCF9532 LED Driver Library
kevinkent 0:960d250e49b2 2 *
kevinkent 0:960d250e49b2 3 * Copyright (c) 2010, cstyles (http://mbed.org)
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 "PCA9532.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 addrss of the device
kevinkent 0:960d250e49b2 30 */
kevinkent 0:960d250e49b2 31 PCA9532::PCA9532(PinName scl, PinName sda, int addr)
kevinkent 0:960d250e49b2 32 : _i2c(scl, sda) {
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
kevinkent 0:960d250e49b2 42
kevinkent 0:960d250e49b2 43
kevinkent 0:960d250e49b2 44 /*
kevinkent 0:960d250e49b2 45 Set the period
kevinkent 0:960d250e49b2 46 */
kevinkent 0:960d250e49b2 47 int PCA9532::Period (int channel, float period) {
kevinkent 0:960d250e49b2 48
kevinkent 0:960d250e49b2 49 char reg = 0;
kevinkent 0:960d250e49b2 50
kevinkent 0:960d250e49b2 51 if (channel == 0) {
kevinkent 0:960d250e49b2 52 reg = PCA9532_REG_PSC0;
kevinkent 0:960d250e49b2 53 } else if (channel == 1) {
kevinkent 0:960d250e49b2 54 reg = PCA9532_REG_PSC1;
kevinkent 0:960d250e49b2 55 } else {
kevinkent 0:960d250e49b2 56 return (1);
kevinkent 0:960d250e49b2 57 }
kevinkent 0:960d250e49b2 58
kevinkent 0:960d250e49b2 59 if (period > 1.0) {
kevinkent 0:960d250e49b2 60 period = 255;
kevinkent 0:960d250e49b2 61 } else if ( period < 0.0 ) {
kevinkent 0:960d250e49b2 62 period = 0;
kevinkent 0:960d250e49b2 63 } else {
kevinkent 0:960d250e49b2 64 period = 256 * period;
kevinkent 0:960d250e49b2 65 }
kevinkent 0:960d250e49b2 66
kevinkent 0:960d250e49b2 67 _write(reg, period);
kevinkent 0:960d250e49b2 68 return(0);
kevinkent 0:960d250e49b2 69
kevinkent 0:960d250e49b2 70 }
kevinkent 0:960d250e49b2 71
kevinkent 0:960d250e49b2 72
kevinkent 0:960d250e49b2 73 /*
kevinkent 0:960d250e49b2 74 Set the duty cycle
kevinkent 0:960d250e49b2 75 */
kevinkent 0:960d250e49b2 76 int PCA9532::Duty (int channel, float d) {
kevinkent 0:960d250e49b2 77
kevinkent 0:960d250e49b2 78 char duty = 0;
kevinkent 0:960d250e49b2 79 char reg = 0;
kevinkent 0:960d250e49b2 80
kevinkent 0:960d250e49b2 81 if (channel == 0) {
kevinkent 0:960d250e49b2 82 reg = PCA9532_REG_PWM0;
kevinkent 0:960d250e49b2 83 } else if (channel == 1) {
kevinkent 0:960d250e49b2 84 reg = PCA9532_REG_PWM1;
kevinkent 0:960d250e49b2 85 } else {
kevinkent 0:960d250e49b2 86 return (1);
kevinkent 0:960d250e49b2 87 }
kevinkent 0:960d250e49b2 88
kevinkent 0:960d250e49b2 89 if (d > 1.0) {
kevinkent 0:960d250e49b2 90 duty = 255;
kevinkent 0:960d250e49b2 91 } else if ( d < 0.0 ) {
kevinkent 0:960d250e49b2 92 duty = 0;
kevinkent 0:960d250e49b2 93 } else {
kevinkent 0:960d250e49b2 94 duty = 256 * d;
kevinkent 0:960d250e49b2 95 }
kevinkent 0:960d250e49b2 96
kevinkent 0:960d250e49b2 97 _write(reg, duty);
kevinkent 0:960d250e49b2 98 return(0);
kevinkent 0:960d250e49b2 99
kevinkent 0:960d250e49b2 100 }
kevinkent 0:960d250e49b2 101
kevinkent 0:960d250e49b2 102 /*
kevinkent 0:960d250e49b2 103 Set each of the LEDs in this mask to the give mode
kevinkent 0:960d250e49b2 104 Loop through the mask calling SetLed on each match
kevinkent 0:960d250e49b2 105 alt_mode specifies the mode of the non-Matches of SetMode
kevinkent 0:960d250e49b2 106 */
kevinkent 0:960d250e49b2 107 int PCA9532::SetMode (int mask, int mode) {
kevinkent 0:960d250e49b2 108 if ( (mode < 0) || (mode > 3) ) {
kevinkent 0:960d250e49b2 109 return(1);
kevinkent 0:960d250e49b2 110 } else {
kevinkent 0:960d250e49b2 111 for (int i=0 ; i < 16 ; i++ ) {
kevinkent 0:960d250e49b2 112
kevinkent 0:960d250e49b2 113 // if this matches, set the LED to the mode
kevinkent 0:960d250e49b2 114 if (mask & (0x1 << i)) {
kevinkent 0:960d250e49b2 115 SetLed(i,mode);
kevinkent 0:960d250e49b2 116 }
kevinkent 0:960d250e49b2 117 }
kevinkent 0:960d250e49b2 118 }
kevinkent 0:960d250e49b2 119 return(0);
kevinkent 0:960d250e49b2 120 }
kevinkent 0:960d250e49b2 121
kevinkent 0:960d250e49b2 122
kevinkent 0:960d250e49b2 123
kevinkent 0:960d250e49b2 124 /*
kevinkent 0:960d250e49b2 125 led is in the range 0-15
kevinkent 0:960d250e49b2 126 mode is inthe range 0-3
kevinkent 0:960d250e49b2 127 */
kevinkent 0:960d250e49b2 128 int PCA9532::SetLed(int led, int mode) {
kevinkent 0:960d250e49b2 129
kevinkent 0:960d250e49b2 130 int reg = 0;
kevinkent 0:960d250e49b2 131 int offset = (led % 4);
kevinkent 0:960d250e49b2 132
kevinkent 0:960d250e49b2 133 printf("\nSetLed(%d,%d)\n", led, mode);
kevinkent 0:960d250e49b2 134
kevinkent 0:960d250e49b2 135 // makesure mode is within bounds
kevinkent 0:960d250e49b2 136 if ( (mode < 0) || (mode > 3) ) {
kevinkent 0:960d250e49b2 137 printf("Error : Invalid mode supplied\n");
kevinkent 0:960d250e49b2 138 return(1);
kevinkent 0:960d250e49b2 139 }
kevinkent 0:960d250e49b2 140
kevinkent 0:960d250e49b2 141 // determine which register this is,
kevinkent 0:960d250e49b2 142 if (led < 4) {
kevinkent 0:960d250e49b2 143 reg = PCA9532_REG_LS0;
kevinkent 0:960d250e49b2 144 } else if ( (led > 3) && (led < 8) ) {
kevinkent 0:960d250e49b2 145 reg = PCA9532_REG_LS1;
kevinkent 0:960d250e49b2 146 } else if ( (led > 7) && (led < 12) ) {
kevinkent 0:960d250e49b2 147 reg = PCA9532_REG_LS2;
kevinkent 0:960d250e49b2 148 } else if ( (led > 11) && (led < 16) ) {
kevinkent 0:960d250e49b2 149 reg = PCA9532_REG_LS3;
kevinkent 0:960d250e49b2 150 } else {
kevinkent 0:960d250e49b2 151 return(1);
kevinkent 0:960d250e49b2 152 }
kevinkent 0:960d250e49b2 153
kevinkent 0:960d250e49b2 154 // read the current status of the register
kevinkent 0:960d250e49b2 155 char regval = _read(reg);
kevinkent 0:960d250e49b2 156
kevinkent 0:960d250e49b2 157 // clear the two bit slice at the calculated offset
kevinkent 0:960d250e49b2 158 regval &= ~(0x3 << (2 * offset));
kevinkent 0:960d250e49b2 159
kevinkent 0:960d250e49b2 160 // now OR in the mode, shifted by 2*offset
kevinkent 0:960d250e49b2 161 regval |= (mode << (2 * offset));
kevinkent 0:960d250e49b2 162
kevinkent 0:960d250e49b2 163 // write the new value back
kevinkent 0:960d250e49b2 164 _write(reg, regval);
kevinkent 0:960d250e49b2 165
kevinkent 0:960d250e49b2 166 return(0);
kevinkent 0:960d250e49b2 167 }
kevinkent 0:960d250e49b2 168
kevinkent 0:960d250e49b2 169
kevinkent 0:960d250e49b2 170
kevinkent 0:960d250e49b2 171 // private functions for low level IO
kevinkent 0:960d250e49b2 172
kevinkent 0:960d250e49b2 173 void PCA9532::_write(int reg, int data) {
kevinkent 0:960d250e49b2 174 char args[2];
kevinkent 0:960d250e49b2 175 args[0] = reg;
kevinkent 0:960d250e49b2 176 args[1] = data;
kevinkent 0:960d250e49b2 177 _i2c.write(_addr, args,2);
kevinkent 0:960d250e49b2 178 }
kevinkent 0:960d250e49b2 179
kevinkent 0:960d250e49b2 180 int PCA9532::_read(int reg) {
kevinkent 0:960d250e49b2 181 char args[2];
kevinkent 0:960d250e49b2 182 args[0] = reg;
kevinkent 0:960d250e49b2 183 _i2c.write(_addr, args, 1);
kevinkent 0:960d250e49b2 184 _i2c.read(_addr, args, 1);
kevinkent 0:960d250e49b2 185 return(args[0]);
kevinkent 0:960d250e49b2 186 }
kevinkent 0:960d250e49b2 187
kevinkent 0:960d250e49b2 188
kevinkent 0:960d250e49b2 189
kevinkent 0:960d250e49b2 190
kevinkent 0:960d250e49b2 191