Rod Coleman / AD5258

Interface to Analog devices AD5258 digital I2C potentiometer

AD5258.cpp@3:f5b60d166896, 2013-11-12 (annotated)

Committer:
RodColeman
Date:
Tue Nov 12 13:51:04 2013 +0000
Revision:
3:f5b60d166896
Parent:
2:8a71db02417b 
add GPL

Who changed what in which revision?

UserRevisionLine numberNew contents of line
RodColeman 3:f5b60d166896 1 /* Copyright 2013 Rod Coleman
RodColeman 3:f5b60d166896 2
RodColeman 3:f5b60d166896 3 This program is free software: you can redistribute it and/or modify
RodColeman 3:f5b60d166896 4 it under the terms of the GNU General Public License as published by
RodColeman 3:f5b60d166896 5 the Free Software Foundation, either version 3 of the License, or
RodColeman 3:f5b60d166896 6 (at your option) any later version.
RodColeman 3:f5b60d166896 7
RodColeman 3:f5b60d166896 8 This program is distributed in the hope that it will be useful,
RodColeman 3:f5b60d166896 9 but WITHOUT ANY WARRANTY; without even the implied warranty of
RodColeman 3:f5b60d166896 10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
RodColeman 3:f5b60d166896 11 GNU General Public License for more details.
RodColeman 3:f5b60d166896 12
RodColeman 3:f5b60d166896 13 You should have received a copy of the GNU General Public License
RodColeman 3:f5b60d166896 14 along with this program. If not, see <http://www.gnu.org/licenses/>.
RodColeman 3:f5b60d166896 15 */
RodColeman 3:f5b60d166896 16
RodColeman 0:8920c7d857d8 17 #include "AD5258.h"
RodColeman 0:8920c7d857d8 18 #include "mbed.h"
RodColeman 0:8920c7d857d8 19
RodColeman 0:8920c7d857d8 20 AD5258::AD5258(PinName sda, PinName scl, int address)
RodColeman 0:8920c7d857d8 21 : _i2c(sda, scl) {
RodColeman 0:8920c7d857d8 22 _address = address;
RodColeman 0:8920c7d857d8 23 }
RodColeman 0:8920c7d857d8 24
RodColeman 1:64570234d7b5 25
RodColeman 1:64570234d7b5 26 // RDAC ACCESS: values of 0 to 0x3F for full pot range.
RodColeman 1:64570234d7b5 27
RodColeman 0:8920c7d857d8 28 int AD5258::read() {
RodColeman 0:8920c7d857d8 29 char foo[1];
RodColeman 1:64570234d7b5 30 foo[0] = 00; // command to read RDAC
RodColeman 1:64570234d7b5 31 _i2c.write(_address, foo, 1);
RodColeman 0:8920c7d857d8 32 _i2c.read(_address, foo, 1);
RodColeman 0:8920c7d857d8 33 return foo[0];
RodColeman 0:8920c7d857d8 34 }
RodColeman 0:8920c7d857d8 35
RodColeman 0:8920c7d857d8 36 void AD5258::write(int data) {
RodColeman 0:8920c7d857d8 37 char foo[2];
RodColeman 0:8920c7d857d8 38 foo[0] = 00;
RodColeman 0:8920c7d857d8 39 foo[1] = data;
RodColeman 0:8920c7d857d8 40 _i2c.write(_address, foo, 2);
RodColeman 0:8920c7d857d8 41 }
RodColeman 1:64570234d7b5 42
RodColeman 1:64570234d7b5 43 // EEPROM ACCESS
RodColeman 1:64570234d7b5 44
RodColeman 1:64570234d7b5 45 int AD5258::readEE() {
RodColeman 1:64570234d7b5 46 char foo[1];
RodColeman 1:64570234d7b5 47 foo[0] = 0x20; // command to read RDAC
RodColeman 1:64570234d7b5 48 _i2c.write(_address, foo, 1);
RodColeman 1:64570234d7b5 49 _i2c.read(_address, foo, 1);
RodColeman 1:64570234d7b5 50 return foo[0];
RodColeman 1:64570234d7b5 51 }
RodColeman 1:64570234d7b5 52
RodColeman 1:64570234d7b5 53 void AD5258::writeEE(int data) {
RodColeman 1:64570234d7b5 54 char foo[2];
RodColeman 1:64570234d7b5 55 foo[0] = 0x20;
RodColeman 1:64570234d7b5 56 foo[1] = data;
RodColeman 1:64570234d7b5 57 _i2c.write(_address, foo, 2);
RodColeman 1:64570234d7b5 58 }
RodColeman 1:64570234d7b5 59
RodColeman 1:64570234d7b5 60 // Store RDAC value to EEPROM, for nonvol retention:
RodColeman 1:64570234d7b5 61 void AD5258::store(void) {
RodColeman 1:64570234d7b5 62 char foo[1];
RodColeman 1:64570234d7b5 63 foo[0] = 0xC0; // command to store RDAC to EE
RodColeman 1:64570234d7b5 64 _i2c.write(_address, foo, 1);
RodColeman 1:64570234d7b5 65 }
RodColeman 1:64570234d7b5 66
RodColeman 1:64570234d7b5 67 // restore RDAC value from EEPROM
RodColeman 1:64570234d7b5 68 void AD5258::restore(void) {
RodColeman 1:64570234d7b5 69 char foo[2];
RodColeman 1:64570234d7b5 70 foo[0] = 0xA0; // command to store RDAC to EE
RodColeman 1:64570234d7b5 71 foo[1] = 0x80; // NOP to restore low power mode
RodColeman 1:64570234d7b5 72 _i2c.write(_address, foo, 1);
RodColeman 2:8a71db02417b 73 }
RodColeman 2:8a71db02417b 74
RodColeman 2:8a71db02417b 75 // software write protect
RodColeman 2:8a71db02417b 76 void AD5258::writeProtect(bool enable) {
RodColeman 2:8a71db02417b 77 char foo[2];
RodColeman 2:8a71db02417b 78 foo[0] = 0x40; // command to store RDAC to EE
RodColeman 2:8a71db02417b 79 if (enable) {
RodColeman 2:8a71db02417b 80 foo[1] = 0x01; // SET WP
RodColeman 2:8a71db02417b 81 }
RodColeman 2:8a71db02417b 82 else {
RodColeman 2:8a71db02417b 83 foo[1] = 0x010; // RESET WP (enable writes)
RodColeman 2:8a71db02417b 84 }
RodColeman 2:8a71db02417b 85 _i2c.write(_address, foo, 2);
RodColeman 1:64570234d7b5 86 }