Chris Styles
/
EA_PCA9532_Example
Example of PCA9532 being used on the Embedded Artists Baseboard, this time fading up LEDs using PWM
PCA9532.cpp@0:0df46cf615c3, 2010-05-07 (annotated)
- Committer:
- chris
- Date:
- Fri May 07 12:41:06 2010 +0000
- Revision:
- 0:0df46cf615c3
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
chris | 0:0df46cf615c3 | 1 | /* mbed PCF9532 LED Driver Library |
chris | 0:0df46cf615c3 | 2 | * |
chris | 0:0df46cf615c3 | 3 | * Copyright (c) 2010, cstyles (http://mbed.org) |
chris | 0:0df46cf615c3 | 4 | * |
chris | 0:0df46cf615c3 | 5 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
chris | 0:0df46cf615c3 | 6 | * of this software and associated documentation files (the "Software"), to deal |
chris | 0:0df46cf615c3 | 7 | * in the Software without restriction, including without limitation the rights |
chris | 0:0df46cf615c3 | 8 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
chris | 0:0df46cf615c3 | 9 | * copies of the Software, and to permit persons to whom the Software is |
chris | 0:0df46cf615c3 | 10 | * furnished to do so, subject to the following conditions: |
chris | 0:0df46cf615c3 | 11 | * |
chris | 0:0df46cf615c3 | 12 | * The above copyright notice and this permission notice shall be included in |
chris | 0:0df46cf615c3 | 13 | * all copies or substantial portions of the Software. |
chris | 0:0df46cf615c3 | 14 | * |
chris | 0:0df46cf615c3 | 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
chris | 0:0df46cf615c3 | 16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
chris | 0:0df46cf615c3 | 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
chris | 0:0df46cf615c3 | 18 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
chris | 0:0df46cf615c3 | 19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
chris | 0:0df46cf615c3 | 20 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
chris | 0:0df46cf615c3 | 21 | * THE SOFTWARE. |
chris | 0:0df46cf615c3 | 22 | */ |
chris | 0:0df46cf615c3 | 23 | |
chris | 0:0df46cf615c3 | 24 | |
chris | 0:0df46cf615c3 | 25 | #include "PCA9532.h" |
chris | 0:0df46cf615c3 | 26 | #include "mbed.h" |
chris | 0:0df46cf615c3 | 27 | |
chris | 0:0df46cf615c3 | 28 | /* |
chris | 0:0df46cf615c3 | 29 | Constructor, pin names for I2C and the I2C addrss of the device |
chris | 0:0df46cf615c3 | 30 | */ |
chris | 0:0df46cf615c3 | 31 | PCA9532::PCA9532(PinName scl, PinName sda, int addr) |
chris | 0:0df46cf615c3 | 32 | : _i2c(scl, sda) { |
chris | 0:0df46cf615c3 | 33 | |
chris | 0:0df46cf615c3 | 34 | _i2c.frequency(1000000); |
chris | 0:0df46cf615c3 | 35 | |
chris | 0:0df46cf615c3 | 36 | _addr = addr; |
chris | 0:0df46cf615c3 | 37 | |
chris | 0:0df46cf615c3 | 38 | } |
chris | 0:0df46cf615c3 | 39 | |
chris | 0:0df46cf615c3 | 40 | |
chris | 0:0df46cf615c3 | 41 | |
chris | 0:0df46cf615c3 | 42 | |
chris | 0:0df46cf615c3 | 43 | |
chris | 0:0df46cf615c3 | 44 | /* |
chris | 0:0df46cf615c3 | 45 | Set the period |
chris | 0:0df46cf615c3 | 46 | */ |
chris | 0:0df46cf615c3 | 47 | int PCA9532::Period (int channel, float period) { |
chris | 0:0df46cf615c3 | 48 | |
chris | 0:0df46cf615c3 | 49 | char reg = 0; |
chris | 0:0df46cf615c3 | 50 | |
chris | 0:0df46cf615c3 | 51 | if (channel == 0) { |
chris | 0:0df46cf615c3 | 52 | reg = PCA9532_REG_PSC0; |
chris | 0:0df46cf615c3 | 53 | } else if (channel == 1) { |
chris | 0:0df46cf615c3 | 54 | reg = PCA9532_REG_PSC1; |
chris | 0:0df46cf615c3 | 55 | } else { |
chris | 0:0df46cf615c3 | 56 | return (1); |
chris | 0:0df46cf615c3 | 57 | } |
chris | 0:0df46cf615c3 | 58 | |
chris | 0:0df46cf615c3 | 59 | if (period > 1.0) { |
chris | 0:0df46cf615c3 | 60 | period = 255; |
chris | 0:0df46cf615c3 | 61 | } else if ( period < 0.0 ) { |
chris | 0:0df46cf615c3 | 62 | period = 0; |
chris | 0:0df46cf615c3 | 63 | } else { |
chris | 0:0df46cf615c3 | 64 | period = 256 * period; |
chris | 0:0df46cf615c3 | 65 | } |
chris | 0:0df46cf615c3 | 66 | |
chris | 0:0df46cf615c3 | 67 | _write(reg, period); |
chris | 0:0df46cf615c3 | 68 | return(0); |
chris | 0:0df46cf615c3 | 69 | |
chris | 0:0df46cf615c3 | 70 | } |
chris | 0:0df46cf615c3 | 71 | |
chris | 0:0df46cf615c3 | 72 | |
chris | 0:0df46cf615c3 | 73 | /* |
chris | 0:0df46cf615c3 | 74 | Set the duty cycle |
chris | 0:0df46cf615c3 | 75 | */ |
chris | 0:0df46cf615c3 | 76 | int PCA9532::Duty (int channel, float d) { |
chris | 0:0df46cf615c3 | 77 | |
chris | 0:0df46cf615c3 | 78 | char duty = 0; |
chris | 0:0df46cf615c3 | 79 | char reg = 0; |
chris | 0:0df46cf615c3 | 80 | |
chris | 0:0df46cf615c3 | 81 | if (channel == 0) { |
chris | 0:0df46cf615c3 | 82 | reg = PCA9532_REG_PWM0; |
chris | 0:0df46cf615c3 | 83 | } else if (channel == 1) { |
chris | 0:0df46cf615c3 | 84 | reg = PCA9532_REG_PWM1; |
chris | 0:0df46cf615c3 | 85 | } else { |
chris | 0:0df46cf615c3 | 86 | return (1); |
chris | 0:0df46cf615c3 | 87 | } |
chris | 0:0df46cf615c3 | 88 | |
chris | 0:0df46cf615c3 | 89 | if (d > 1.0) { |
chris | 0:0df46cf615c3 | 90 | duty = 255; |
chris | 0:0df46cf615c3 | 91 | } else if ( d < 0.0 ) { |
chris | 0:0df46cf615c3 | 92 | duty = 0; |
chris | 0:0df46cf615c3 | 93 | } else { |
chris | 0:0df46cf615c3 | 94 | duty = 256 * d; |
chris | 0:0df46cf615c3 | 95 | } |
chris | 0:0df46cf615c3 | 96 | |
chris | 0:0df46cf615c3 | 97 | _write(reg, duty); |
chris | 0:0df46cf615c3 | 98 | return(0); |
chris | 0:0df46cf615c3 | 99 | |
chris | 0:0df46cf615c3 | 100 | } |
chris | 0:0df46cf615c3 | 101 | |
chris | 0:0df46cf615c3 | 102 | /* |
chris | 0:0df46cf615c3 | 103 | Set each of the LEDs in this mask to the give mode |
chris | 0:0df46cf615c3 | 104 | Loop through the mask calling SetLed on each match |
chris | 0:0df46cf615c3 | 105 | alt_mode specifies the mode of the non-Matches of SetMode |
chris | 0:0df46cf615c3 | 106 | */ |
chris | 0:0df46cf615c3 | 107 | int PCA9532::SetMode (int mask, int mode) { |
chris | 0:0df46cf615c3 | 108 | if ( (mode < 0) || (mode > 3) ) { |
chris | 0:0df46cf615c3 | 109 | return(1); |
chris | 0:0df46cf615c3 | 110 | } else { |
chris | 0:0df46cf615c3 | 111 | for (int i=0 ; i < 16 ; i++ ) { |
chris | 0:0df46cf615c3 | 112 | |
chris | 0:0df46cf615c3 | 113 | // if this matches, set the LED to the mode |
chris | 0:0df46cf615c3 | 114 | if (mask & (0x1 << i)) { |
chris | 0:0df46cf615c3 | 115 | SetLed(i,mode); |
chris | 0:0df46cf615c3 | 116 | } |
chris | 0:0df46cf615c3 | 117 | } |
chris | 0:0df46cf615c3 | 118 | } |
chris | 0:0df46cf615c3 | 119 | return(0); |
chris | 0:0df46cf615c3 | 120 | } |
chris | 0:0df46cf615c3 | 121 | |
chris | 0:0df46cf615c3 | 122 | |
chris | 0:0df46cf615c3 | 123 | |
chris | 0:0df46cf615c3 | 124 | /* |
chris | 0:0df46cf615c3 | 125 | led is in the range 0-15 |
chris | 0:0df46cf615c3 | 126 | mode is inthe range 0-3 |
chris | 0:0df46cf615c3 | 127 | */ |
chris | 0:0df46cf615c3 | 128 | int PCA9532::SetLed(int led, int mode) { |
chris | 0:0df46cf615c3 | 129 | |
chris | 0:0df46cf615c3 | 130 | int reg = 0; |
chris | 0:0df46cf615c3 | 131 | int offset = (led % 4); |
chris | 0:0df46cf615c3 | 132 | |
chris | 0:0df46cf615c3 | 133 | printf("\nSetLed(%d,%d)\n", led, mode); |
chris | 0:0df46cf615c3 | 134 | |
chris | 0:0df46cf615c3 | 135 | // makesure mode is within bounds |
chris | 0:0df46cf615c3 | 136 | if ( (mode < 0) || (mode > 3) ) { |
chris | 0:0df46cf615c3 | 137 | printf("Error : Invalid mode supplied\n"); |
chris | 0:0df46cf615c3 | 138 | return(1); |
chris | 0:0df46cf615c3 | 139 | } |
chris | 0:0df46cf615c3 | 140 | |
chris | 0:0df46cf615c3 | 141 | // determine which register this is, |
chris | 0:0df46cf615c3 | 142 | if (led < 4) { |
chris | 0:0df46cf615c3 | 143 | reg = PCA9532_REG_LS0; |
chris | 0:0df46cf615c3 | 144 | } else if ( (led > 3) && (led < 8) ) { |
chris | 0:0df46cf615c3 | 145 | reg = PCA9532_REG_LS1; |
chris | 0:0df46cf615c3 | 146 | } else if ( (led > 7) && (led < 12) ) { |
chris | 0:0df46cf615c3 | 147 | reg = PCA9532_REG_LS2; |
chris | 0:0df46cf615c3 | 148 | } else if ( (led > 11) && (led < 16) ) { |
chris | 0:0df46cf615c3 | 149 | reg = PCA9532_REG_LS3; |
chris | 0:0df46cf615c3 | 150 | } else { |
chris | 0:0df46cf615c3 | 151 | return(1); |
chris | 0:0df46cf615c3 | 152 | } |
chris | 0:0df46cf615c3 | 153 | |
chris | 0:0df46cf615c3 | 154 | // read the current status of the register |
chris | 0:0df46cf615c3 | 155 | char regval = _read(reg); |
chris | 0:0df46cf615c3 | 156 | |
chris | 0:0df46cf615c3 | 157 | // clear the two bit slice at the calculated offset |
chris | 0:0df46cf615c3 | 158 | regval &= ~(0x3 << (2 * offset)); |
chris | 0:0df46cf615c3 | 159 | |
chris | 0:0df46cf615c3 | 160 | // now OR in the mode, shifted by 2*offset |
chris | 0:0df46cf615c3 | 161 | regval |= (mode << (2 * offset)); |
chris | 0:0df46cf615c3 | 162 | |
chris | 0:0df46cf615c3 | 163 | // write the new value back |
chris | 0:0df46cf615c3 | 164 | _write(reg, regval); |
chris | 0:0df46cf615c3 | 165 | |
chris | 0:0df46cf615c3 | 166 | return(0); |
chris | 0:0df46cf615c3 | 167 | } |
chris | 0:0df46cf615c3 | 168 | |
chris | 0:0df46cf615c3 | 169 | |
chris | 0:0df46cf615c3 | 170 | |
chris | 0:0df46cf615c3 | 171 | // private functions for low level IO |
chris | 0:0df46cf615c3 | 172 | |
chris | 0:0df46cf615c3 | 173 | void PCA9532::_write(int reg, int data) { |
chris | 0:0df46cf615c3 | 174 | char args[2]; |
chris | 0:0df46cf615c3 | 175 | args[0] = reg; |
chris | 0:0df46cf615c3 | 176 | args[1] = data; |
chris | 0:0df46cf615c3 | 177 | _i2c.write(_addr, args,2); |
chris | 0:0df46cf615c3 | 178 | } |
chris | 0:0df46cf615c3 | 179 | |
chris | 0:0df46cf615c3 | 180 | int PCA9532::_read(int reg) { |
chris | 0:0df46cf615c3 | 181 | char args[2]; |
chris | 0:0df46cf615c3 | 182 | args[0] = reg; |
chris | 0:0df46cf615c3 | 183 | _i2c.write(_addr, args, 1); |
chris | 0:0df46cf615c3 | 184 | _i2c.read(_addr, args, 1); |
chris | 0:0df46cf615c3 | 185 | return(args[0]); |
chris | 0:0df46cf615c3 | 186 | } |
chris | 0:0df46cf615c3 | 187 | |
chris | 0:0df46cf615c3 | 188 | |
chris | 0:0df46cf615c3 | 189 | |
chris | 0:0df46cf615c3 | 190 | |
chris | 0:0df46cf615c3 | 191 |