Rod Coleman / AD5258

Interface to Analog devices AD5258 digital I2C potentiometer

AD5258.cpp@2:8a71db02417b, 2013-11-12 (annotated)

Committer:
RodColeman
Date:
Tue Nov 12 12:57:07 2013 +0000
Revision:
2:8a71db02417b
Parent:
1:64570234d7b5
Child:
3:f5b60d166896
v4.29: first release with RF Detect I2C trimmer (manual only)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
RodColeman 0:8920c7d857d8 1 #include "AD5258.h"
RodColeman 0:8920c7d857d8 2 #include "mbed.h"
RodColeman 0:8920c7d857d8 3
RodColeman 0:8920c7d857d8 4 AD5258::AD5258(PinName sda, PinName scl, int address)
RodColeman 0:8920c7d857d8 5 : _i2c(sda, scl) {
RodColeman 0:8920c7d857d8 6 _address = address;
RodColeman 0:8920c7d857d8 7 }
RodColeman 0:8920c7d857d8 8
RodColeman 1:64570234d7b5 9
RodColeman 1:64570234d7b5 10 // RDAC ACCESS: values of 0 to 0x3F for full pot range.
RodColeman 1:64570234d7b5 11
RodColeman 0:8920c7d857d8 12 int AD5258::read() {
RodColeman 0:8920c7d857d8 13 char foo[1];
RodColeman 1:64570234d7b5 14 foo[0] = 00; // command to read RDAC
RodColeman 1:64570234d7b5 15 _i2c.write(_address, foo, 1);
RodColeman 0:8920c7d857d8 16 _i2c.read(_address, foo, 1);
RodColeman 0:8920c7d857d8 17 return foo[0];
RodColeman 0:8920c7d857d8 18 }
RodColeman 0:8920c7d857d8 19
RodColeman 0:8920c7d857d8 20 void AD5258::write(int data) {
RodColeman 0:8920c7d857d8 21 char foo[2];
RodColeman 0:8920c7d857d8 22 foo[0] = 00;
RodColeman 0:8920c7d857d8 23 foo[1] = data;
RodColeman 0:8920c7d857d8 24 _i2c.write(_address, foo, 2);
RodColeman 0:8920c7d857d8 25 }
RodColeman 1:64570234d7b5 26
RodColeman 1:64570234d7b5 27 // EEPROM ACCESS
RodColeman 1:64570234d7b5 28
RodColeman 1:64570234d7b5 29 int AD5258::readEE() {
RodColeman 1:64570234d7b5 30 char foo[1];
RodColeman 1:64570234d7b5 31 foo[0] = 0x20; // command to read RDAC
RodColeman 1:64570234d7b5 32 _i2c.write(_address, foo, 1);
RodColeman 1:64570234d7b5 33 _i2c.read(_address, foo, 1);
RodColeman 1:64570234d7b5 34 return foo[0];
RodColeman 1:64570234d7b5 35 }
RodColeman 1:64570234d7b5 36
RodColeman 1:64570234d7b5 37 void AD5258::writeEE(int data) {
RodColeman 1:64570234d7b5 38 char foo[2];
RodColeman 1:64570234d7b5 39 foo[0] = 0x20;
RodColeman 1:64570234d7b5 40 foo[1] = data;
RodColeman 1:64570234d7b5 41 _i2c.write(_address, foo, 2);
RodColeman 1:64570234d7b5 42 }
RodColeman 1:64570234d7b5 43
RodColeman 1:64570234d7b5 44 // Store RDAC value to EEPROM, for nonvol retention:
RodColeman 1:64570234d7b5 45 void AD5258::store(void) {
RodColeman 1:64570234d7b5 46 char foo[1];
RodColeman 1:64570234d7b5 47 foo[0] = 0xC0; // command to store RDAC to EE
RodColeman 1:64570234d7b5 48 _i2c.write(_address, foo, 1);
RodColeman 1:64570234d7b5 49 }
RodColeman 1:64570234d7b5 50
RodColeman 1:64570234d7b5 51 // restore RDAC value from EEPROM
RodColeman 1:64570234d7b5 52 void AD5258::restore(void) {
RodColeman 1:64570234d7b5 53 char foo[2];
RodColeman 1:64570234d7b5 54 foo[0] = 0xA0; // command to store RDAC to EE
RodColeman 1:64570234d7b5 55 foo[1] = 0x80; // NOP to restore low power mode
RodColeman 1:64570234d7b5 56 _i2c.write(_address, foo, 1);
RodColeman 2:8a71db02417b 57 }
RodColeman 2:8a71db02417b 58
RodColeman 2:8a71db02417b 59 // software write protect
RodColeman 2:8a71db02417b 60 void AD5258::writeProtect(bool enable) {
RodColeman 2:8a71db02417b 61 char foo[2];
RodColeman 2:8a71db02417b 62 foo[0] = 0x40; // command to store RDAC to EE
RodColeman 2:8a71db02417b 63 if (enable) {
RodColeman 2:8a71db02417b 64 foo[1] = 0x01; // SET WP
RodColeman 2:8a71db02417b 65 }
RodColeman 2:8a71db02417b 66 else {
RodColeman 2:8a71db02417b 67 foo[1] = 0x010; // RESET WP (enable writes)
RodColeman 2:8a71db02417b 68 }
RodColeman 2:8a71db02417b 69 _i2c.write(_address, foo, 2);
RodColeman 1:64570234d7b5 70 }