Mark Gottscho / SensorsLib

A compilation of some hardware sensors and their shared programming interfaces.

MAX17043.cpp@1:15396cab58d1, 2014-03-19 (annotated)

Committer:
mgottscho
Date:
Wed Mar 19 00:35:31 2014 +0000
Revision:
1:15396cab58d1
Parent:
0:8d34cc2ff388 
Updated for most recent UtilityLib.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mgottscho 0:8d34cc2ff388 1 /* MAX17043.cpp
mgottscho 0:8d34cc2ff388 2 * Tested with mbed board: FRDM-KL46Z
mgottscho 0:8d34cc2ff388 3 * Author: Mark Gottscho
mgottscho 0:8d34cc2ff388 4 * mgottscho@ucla.edu
mgottscho 0:8d34cc2ff388 5 */
mgottscho 0:8d34cc2ff388 6
mgottscho 0:8d34cc2ff388 7
mgottscho 0:8d34cc2ff388 8 #include "mbed.h"
mgottscho 0:8d34cc2ff388 9 #include "I2CSensor.h"
mgottscho 0:8d34cc2ff388 10 #include "PeriodicSensor.h"
mgottscho 0:8d34cc2ff388 11 #include "MAX17043.h"
mgottscho 0:8d34cc2ff388 12
mgottscho 0:8d34cc2ff388 13
mgottscho 0:8d34cc2ff388 14 MAX17043::MAX17043(PinName sda, PinName scl, int i2c_addr) :
mgottscho 0:8d34cc2ff388 15 I2CSensor(sda, scl, i2c_addr),
mgottscho 0:8d34cc2ff388 16 PeriodicSensor(0.5), //Default max sampling rate of 2 Hz, because the device internally samples every 500ms after initial POS report
mgottscho 0:8d34cc2ff388 17 __soc(0),
mgottscho 0:8d34cc2ff388 18 __vcell(0)
mgottscho 0:8d34cc2ff388 19 {
mgottscho 0:8d34cc2ff388 20 }
mgottscho 0:8d34cc2ff388 21
mgottscho 0:8d34cc2ff388 22 MAX17043::~MAX17043() { }
mgottscho 0:8d34cc2ff388 23
mgottscho 0:8d34cc2ff388 24 void MAX17043::selfInit() {
mgottscho 0:8d34cc2ff388 25 __i2c.frequency(400000);
mgottscho 0:8d34cc2ff388 26 reset();
mgottscho 0:8d34cc2ff388 27 }
mgottscho 0:8d34cc2ff388 28
mgottscho 0:8d34cc2ff388 29 void MAX17043::reset() {
mgottscho 0:8d34cc2ff388 30 __disable_irq();
mgottscho 0:8d34cc2ff388 31 uint16_t data = RST_CODE;
mgottscho 0:8d34cc2ff388 32 setRegister16b(COMMAND_MSB, data);
mgottscho 0:8d34cc2ff388 33 __enable_irq();
mgottscho 0:8d34cc2ff388 34 wait(0.130); //wait 130ms until first readings are valid (125ms est)
mgottscho 0:8d34cc2ff388 35 }
mgottscho 0:8d34cc2ff388 36
mgottscho 0:8d34cc2ff388 37 uint16_t MAX17043::getVersion() {
mgottscho 0:8d34cc2ff388 38 uint8_t data = getRegister(VERSION_MSB);
mgottscho 0:8d34cc2ff388 39 return (data << 8) | (getRegister(VERSION_LSB));
mgottscho 0:8d34cc2ff388 40 }
mgottscho 0:8d34cc2ff388 41
mgottscho 0:8d34cc2ff388 42 uint16_t MAX17043::getVCell(bool sampleNow) {
mgottscho 0:8d34cc2ff388 43 __disable_irq();
mgottscho 0:8d34cc2ff388 44
mgottscho 0:8d34cc2ff388 45 if (sampleNow) {
mgottscho 0:8d34cc2ff388 46 uint16_t data = getRegister16b(VCELL_MSB);
mgottscho 0:8d34cc2ff388 47 __vcell = data >> 4; //right shift by 4 to throw out the don't care bits
mgottscho 0:8d34cc2ff388 48 }
mgottscho 0:8d34cc2ff388 49 __dataReady = false;
mgottscho 0:8d34cc2ff388 50
mgottscho 0:8d34cc2ff388 51 __enable_irq();
mgottscho 0:8d34cc2ff388 52
mgottscho 0:8d34cc2ff388 53 return __vcell;
mgottscho 0:8d34cc2ff388 54 }
mgottscho 0:8d34cc2ff388 55
mgottscho 0:8d34cc2ff388 56 float MAX17043::getFloatVCell(bool sampleNow) {
mgottscho 0:8d34cc2ff388 57 return getVCell(sampleNow) * DIV_VCELL;
mgottscho 0:8d34cc2ff388 58 }
mgottscho 0:8d34cc2ff388 59
mgottscho 0:8d34cc2ff388 60 uint16_t MAX17043::getSOC(bool sampleNow) {
mgottscho 0:8d34cc2ff388 61 __disable_irq();
mgottscho 0:8d34cc2ff388 62
mgottscho 0:8d34cc2ff388 63 if (sampleNow) {
mgottscho 0:8d34cc2ff388 64 uint8_t data = getRegister(SOC_MSB);
mgottscho 0:8d34cc2ff388 65 __soc = (data << 8) | (getRegister(SOC_LSB));
mgottscho 0:8d34cc2ff388 66 }
mgottscho 0:8d34cc2ff388 67 __dataReady = false;
mgottscho 0:8d34cc2ff388 68
mgottscho 0:8d34cc2ff388 69 __enable_irq();
mgottscho 0:8d34cc2ff388 70
mgottscho 0:8d34cc2ff388 71 return __soc;
mgottscho 0:8d34cc2ff388 72 }
mgottscho 0:8d34cc2ff388 73
mgottscho 0:8d34cc2ff388 74 float MAX17043::getFloatSOC(bool sampleNow) {
mgottscho 0:8d34cc2ff388 75 return getSOC(sampleNow) * DIV_SOC;
mgottscho 0:8d34cc2ff388 76 }
mgottscho 0:8d34cc2ff388 77
mgottscho 0:8d34cc2ff388 78 void MAX17043::__sample_data_ISR() {
mgottscho 0:8d34cc2ff388 79 getSOC(true);
mgottscho 0:8d34cc2ff388 80 getVCell(true);
mgottscho 0:8d34cc2ff388 81 __dataReady = true;
mgottscho 0:8d34cc2ff388 82 }