Lukasz Uszko / MAX9611

library for MAX9611 /9612 Current-Sense Amplifiers

max9611.cpp@8:1e392bc95666, 2015-01-28 (annotated)

Committer:
igbt6
Date:
Wed Jan 28 17:53:26 2015 +0000
Revision:
8:1e392bc95666
Parent:
7:012f5b39405e 
quick code clean up

Who changed what in which revision?

UserRevisionLine numberNew contents of line
igbt6 5:6fec24c37e2a 1 #include "max9611.h"
igbt6 2:d12dffd027a8 2
igbt6 2:d12dffd027a8 3
igbt6 1:131a836c6b79 4
igbt6 1:131a836c6b79 5
igbt6 6:32b5eb1df932 6 MAX9611::MAX9611(PinName sda, PinName scl, int i2cFrequencyHz, int address):mI2c(sda,scl), mI2cAddr(address)
igbt6 5:6fec24c37e2a 7 {
igbt6 6:32b5eb1df932 8 mI2c.frequency(i2cFrequencyHz);
igbt6 7:012f5b39405e 9 if(!initMax9611()); //while(1){ //TODO handle error}
igbt6 7:012f5b39405e 10 mTemperature=0;
igbt6 7:012f5b39405e 11 mCsaCurrentValueOffset=0x0a; //NOTE! set this parameter on your own, it depends on your used sensor
igbt6 1:131a836c6b79 12 }
igbt6 1:131a836c6b79 13
igbt6 1:131a836c6b79 14
igbt6 1:131a836c6b79 15
igbt6 5:6fec24c37e2a 16 //write data to the sensor
igbt6 5:6fec24c37e2a 17 bool MAX9611::write(uint8_t regAddress, uint8_t* data,int dataLength)
igbt6 5:6fec24c37e2a 18 {
igbt6 5:6fec24c37e2a 19 uint8_t tempBuf[dataLength+1];
igbt6 5:6fec24c37e2a 20 tempBuf[0]=regAddress;
igbt6 6:32b5eb1df932 21 memcpy(&(tempBuf[1]),data,dataLength);
igbt6 6:32b5eb1df932 22 return mI2c.write(mI2cAddr,(char*)tempBuf,dataLength+1)==0;
igbt6 6:32b5eb1df932 23
igbt6 5:6fec24c37e2a 24 }
igbt6 5:6fec24c37e2a 25
igbt6 3:41839eb9229f 26 //read data from the sensor
igbt6 5:6fec24c37e2a 27 bool MAX9611::read(uint8_t regAddress, uint8_t *data,int dataLength)
igbt6 5:6fec24c37e2a 28 {
igbt6 6:32b5eb1df932 29 mI2c.write(mI2cAddr,(char*)&regAddress,1,true);
igbt6 6:32b5eb1df932 30 return (mI2c.read(mI2cAddr,(char*)data,dataLength)==0);
igbt6 2:d12dffd027a8 31 }
igbt6 2:d12dffd027a8 32
igbt6 7:012f5b39405e 33 //configuration of MAX9611
igbt6 7:012f5b39405e 34 bool MAX9611::initMax9611(eCtrlReg1MUX mux,
igbt6 7:012f5b39405e 35 eCtrlReg1SHDN shdn,
igbt6 7:012f5b39405e 36 eCtrlReg1LR lr,
igbt6 7:012f5b39405e 37 eCtrlReg1MODE mode,
igbt6 7:012f5b39405e 38 eCtrlReg2DTIM watchdogDelay,
igbt6 7:012f5b39405e 39 eCtrlReg2RTIM watchdogRetryDelay)
igbt6 5:6fec24c37e2a 40 {
igbt6 5:6fec24c37e2a 41 uint8_t retVal=0;
igbt6 5:6fec24c37e2a 42 uint8_t controlReg1=0;
igbt6 5:6fec24c37e2a 43 uint8_t controlReg2=0;
igbt6 5:6fec24c37e2a 44 controlReg1=(mode<<5|lr<<4|shdn<<3|mux);
igbt6 5:6fec24c37e2a 45 controlReg2=(watchdogDelay<<3|watchdogRetryDelay<<2);
igbt6 5:6fec24c37e2a 46 retVal+= write(CONTROL_REGISTER_1_ADRR,&controlReg1,1);
igbt6 5:6fec24c37e2a 47 retVal+= write(CONTROL_REGISTER_2_ADRR,&controlReg2,1);
igbt6 5:6fec24c37e2a 48 if(retVal!=2) return false;
igbt6 8:1e392bc95666 49 mMuxReg= mux;
igbt6 5:6fec24c37e2a 50 return true;
igbt6 2:d12dffd027a8 51 }
igbt6 2:d12dffd027a8 52
igbt6 2:d12dffd027a8 53
igbt6 5:6fec24c37e2a 54 bool MAX9611::readTemp(void)
igbt6 7:012f5b39405e 55 {
igbt6 7:012f5b39405e 56 uint8_t rawData[2];
igbt6 7:012f5b39405e 57 uint16_t rawTemp=0;
igbt6 7:012f5b39405e 58 if(!read(TEMP_DATA_BYTE_MSB_ADRR, rawData,2)) return false;
igbt6 7:012f5b39405e 59 rawTemp= get9BitData(rawData[0],rawData[1]);
igbt6 7:012f5b39405e 60 //mRawInt =rawTemp;
igbt6 7:012f5b39405e 61 if ( rawTemp & 0x100) {
igbt6 7:012f5b39405e 62 mTemperature = (float) (rawTemp- 256)*0.48;
igbt6 7:012f5b39405e 63 } else {
igbt6 7:012f5b39405e 64 mTemperature = (float)(rawTemp) *0.48;
igbt6 7:012f5b39405e 65 }
igbt6 7:012f5b39405e 66
igbt6 6:32b5eb1df932 67 return true;
igbt6 6:32b5eb1df932 68 }
igbt6 6:32b5eb1df932 69
igbt6 6:32b5eb1df932 70
igbt6 6:32b5eb1df932 71 bool MAX9611::readCSAOutputValue(void)
igbt6 6:32b5eb1df932 72 {
igbt6 6:32b5eb1df932 73 uint8_t rawData[2];
igbt6 7:012f5b39405e 74 uint16_t rawCSAVal=0;
igbt6 6:32b5eb1df932 75 if(!read(CSA_DATA_BYTE_MSB_ADRR, rawData,2)) return false;
igbt6 6:32b5eb1df932 76 rawCSAVal= get12BitData(rawData[0],rawData[1]);
igbt6 8:1e392bc95666 77 //mRawInt = rawCSAVal; //debug
igbt6 7:012f5b39405e 78 if(rawCSAVal<=mCsaCurrentValueOffset)
igbt6 7:012f5b39405e 79 mCurrentSenseAmplifierOutput=0;
igbt6 8:1e392bc95666 80 else mCurrentSenseAmplifierOutput= (float)(rawCSAVal)*(getCSACurrentCoeffmA()); // to get result in [mA]
igbt6 7:012f5b39405e 81
igbt6 5:6fec24c37e2a 82 return true;
igbt6 5:6fec24c37e2a 83 }
igbt6 2:d12dffd027a8 84
igbt6 7:012f5b39405e 85 // useful debug methods
igbt6 7:012f5b39405e 86
igbt6 7:012f5b39405e 87 uint16_t MAX9611::readRawControl(void)
igbt6 7:012f5b39405e 88 {
igbt6 7:012f5b39405e 89 uint8_t rawData[2];
igbt6 7:012f5b39405e 90 uint16_t rawCtrl=0;
igbt6 7:012f5b39405e 91 read(CONTROL_REGISTER_1_ADRR, rawData,2) ;
igbt6 7:012f5b39405e 92 rawCtrl= (rawData[0]<<8)|rawData[1];
igbt6 7:012f5b39405e 93 return rawCtrl;
igbt6 7:012f5b39405e 94 }
igbt6 7:012f5b39405e 95
igbt6 2:d12dffd027a8 96
igbt6 7:012f5b39405e 97 uint16_t MAX9611::readRawRsValue(void)
igbt6 7:012f5b39405e 98 {
igbt6 7:012f5b39405e 99 uint8_t rawData[2];
igbt6 7:012f5b39405e 100 uint16_t rawRsVal=0;
igbt6 7:012f5b39405e 101 read(RS_DATA_BYTE_MSB_ADRR, rawData,2) ;
igbt6 7:012f5b39405e 102 rawRsVal= get12BitData(rawData[0],rawData[1]);
igbt6 7:012f5b39405e 103 return rawRsVal;
igbt6 6:32b5eb1df932 104 }
igbt6 6:32b5eb1df932 105
igbt6 6:32b5eb1df932 106
igbt6 7:012f5b39405e 107 uint16_t MAX9611::readRawCSAOutValue(void)
igbt6 7:012f5b39405e 108 {
igbt6 7:012f5b39405e 109 uint8_t rawData[2];
igbt6 7:012f5b39405e 110 uint16_t rawCSAOut=0;
igbt6 7:012f5b39405e 111 read(CSA_DATA_BYTE_MSB_ADRR, rawData,2) ;
igbt6 7:012f5b39405e 112 rawCSAOut= get12BitData(rawData[0],rawData[1]);
igbt6 7:012f5b39405e 113 return rawCSAOut;
igbt6 6:32b5eb1df932 114 }
igbt6 6:32b5eb1df932 115
igbt6 6:32b5eb1df932 116
igbt6 7:012f5b39405e 117 uint16_t MAX9611::readRawOutValue(void)
igbt6 7:012f5b39405e 118 {
igbt6 7:012f5b39405e 119 uint8_t rawData[2];
igbt6 7:012f5b39405e 120 uint16_t rawOut=0;
igbt6 7:012f5b39405e 121 read(OUT_DATA_BYTE_MSB_ADRR, rawData,2) ;
igbt6 7:012f5b39405e 122 rawOut= get12BitData(rawData[0],rawData[1]);
igbt6 7:012f5b39405e 123 return rawOut;
igbt6 6:32b5eb1df932 124 }