Francesco Adamo / ADS7828

mbed library to interface a Texas Instruments' ADS7828, 12-bits, 8-channels, I2C interfaced ADC

Dependents:   ADS7828_demo

ADS7828.cpp@1:19b0f0ba4d12, 2014-12-30 (annotated)

Committer:
frada
Date:
Tue Dec 30 14:22:31 2014 +0000
Revision:
1:19b0f0ba4d12
Child:
2:2ff328d8e4dd
-

Who changed what in which revision?

UserRevisionLine numberNew contents of line
frada 1:19b0f0ba4d12 1 /***************************************************************************
frada 1:19b0f0ba4d12 2 ADS7828.CPP
frada 1:19b0f0ba4d12 3 Implementation file for library ADS7828
frada 1:19b0f0ba4d12 4 The ADS7828 is a 12-bits, 8-channels, I2C-interfaced from Texas Instruments
frada 1:19b0f0ba4d12 5
frada 1:19b0f0ba4d12 6 (c) 2014 - By Francesco Adamo, Italy
frada 1:19b0f0ba4d12 7 *****************************************************************************/
frada 1:19b0f0ba4d12 8
frada 1:19b0f0ba4d12 9 #include "mbed.h"
frada 1:19b0f0ba4d12 10 #include "ads7828.h"
frada 1:19b0f0ba4d12 11
frada 1:19b0f0ba4d12 12 ADS7828::ADS7828(PinName sda, PinName scl, int freq) : _i2c(sda, scl) {
frada 1:19b0f0ba4d12 13 _i2c.frequency(freq); /* I2C clock frequency = set to input value */
frada 1:19b0f0ba4d12 14 address = ADS7828_BASE_ADDRESS;
frada 1:19b0f0ba4d12 15 VFSR = 3.3F;
frada 1:19b0f0ba4d12 16 }
frada 1:19b0f0ba4d12 17
frada 1:19b0f0ba4d12 18 ADS7828::ADS7828(PinName sda, PinName scl) : _i2c(sda, scl) {
frada 1:19b0f0ba4d12 19 _i2c.frequency(100000); /* Default I2C clock frequency = 100 kHz, Normal Mode */
frada 1:19b0f0ba4d12 20 address = ADS7828_BASE_ADDRESS;
frada 1:19b0f0ba4d12 21 VFSR = 3.3F;
frada 1:19b0f0ba4d12 22 }
frada 1:19b0f0ba4d12 23
frada 1:19b0f0ba4d12 24 ADS7828::ADS7828(PinName sda, PinName scl, int freq, char subAddress) : _i2c(sda, scl) {
frada 1:19b0f0ba4d12 25 _i2c.frequency(freq); /* I2C clock frequency = set to input value */
frada 1:19b0f0ba4d12 26 address = ADS7828_BASE_ADDRESS | subAddress;
frada 1:19b0f0ba4d12 27 VFSR = 3.3F;
frada 1:19b0f0ba4d12 28 }
frada 1:19b0f0ba4d12 29
frada 1:19b0f0ba4d12 30
frada 1:19b0f0ba4d12 31 int ADS7828::readRawValue(char mode, char channel) {
frada 1:19b0f0ba4d12 32 char command, D[2], ack;
frada 1:19b0f0ba4d12 33
frada 1:19b0f0ba4d12 34 command = mode | channel;
frada 1:19b0f0ba4d12 35 ack = _i2c.write(address, &command, 1);
frada 1:19b0f0ba4d12 36 if (ack)
frada 1:19b0f0ba4d12 37 return -1;
frada 1:19b0f0ba4d12 38
frada 1:19b0f0ba4d12 39 ack = _i2c.read(address + 1, D, 2); // Read conversion result
frada 1:19b0f0ba4d12 40 if (ack)
frada 1:19b0f0ba4d12 41 return -1;
frada 1:19b0f0ba4d12 42 else
frada 1:19b0f0ba4d12 43 return D[0] << 8 | D[1];
frada 1:19b0f0ba4d12 44 }
frada 1:19b0f0ba4d12 45
frada 1:19b0f0ba4d12 46 double ADS7828::readAnalogValue(char mode, char channel) {
frada 1:19b0f0ba4d12 47 char command, D[2], ack;
frada 1:19b0f0ba4d12 48
frada 1:19b0f0ba4d12 49 command = mode | channel;
frada 1:19b0f0ba4d12 50 ack = _i2c.write(address, &command, 1);
frada 1:19b0f0ba4d12 51 if (ack)
frada 1:19b0f0ba4d12 52 return -1;
frada 1:19b0f0ba4d12 53
frada 1:19b0f0ba4d12 54 ack = _i2c.read(address + 1, D, 2); // Read conversion result
frada 1:19b0f0ba4d12 55 if (ack)
frada 1:19b0f0ba4d12 56 return -1;
frada 1:19b0f0ba4d12 57 else
frada 1:19b0f0ba4d12 58 return VFSR/4096*(D[0] << 8 | D[1]);
frada 1:19b0f0ba4d12 59 }