Bob Giesberts / LDC1614

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Dependencies:   SHTx

Dependents:   Inductive_Sensor_3

Fork of LDC1101 by Bob Giesberts

LDC1000.cpp@11:0f53fbf73613, 2015-05-29 (annotated)

Committer:
hamid567
Date:
Fri May 29 13:45:48 2015 +0000
Revision:
11:0f53fbf73613
Parent:
10:4fa62f8092c4
Child:
12:312970050c8c
Working version with reduced code.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
vsluiter 0:90873b4e8330 1 /**
vsluiter 0:90873b4e8330 2 * @file LDC1000.h
vsluiter 0:90873b4e8330 3 * @brief this C++ file wcontains all required
vsluiter 0:90873b4e8330 4 * functions to interface with Texas
vsluiter 0:90873b4e8330 5 * Instruments' LDC1000.
vsluiter 0:90873b4e8330 6 *
vsluiter 0:90873b4e8330 7 * @author Victor Sluiter
vsluiter 0:90873b4e8330 8 *
vsluiter 0:90873b4e8330 9 * @date 2015-04-01
vsluiter 0:90873b4e8330 10 */
vsluiter 0:90873b4e8330 11
vsluiter 0:90873b4e8330 12 #include "LDC1000.h"
vsluiter 0:90873b4e8330 13
hamid567 4:62ebb87678f8 14 LDC1000::LDC1000(PinName mosi, PinName miso, PinName sck, PinName cs, float capacitor, float f_external, PinName clock_out) : _spiport(mosi,miso,sck,NC), _cs_pin(cs), _clock(clock_out,1)
vsluiter 0:90873b4e8330 15 {
vsluiter 0:90873b4e8330 16 cap = capacitor;
vsluiter 0:90873b4e8330 17 _spiport.format(8,3);
vsluiter 0:90873b4e8330 18 _spiport.frequency(1E6);
vsluiter 0:90873b4e8330 19 _cs_pin.write(1);
hamid567 1:a88df80e7664 20 wait_us(100);
hamid567 7:7f1522ad3df5 21 mode(LDC_MODE_STANDBY);
hamid567 5:98d4fd07734a 22 setFrequency(f_external);
hamid567 8:b5fb9681869c 23 wait(0.1);
hamid567 1:a88df80e7664 24 wait_us(10);
hamid567 8:b5fb9681869c 25
hamid567 8:b5fb9681869c 26 setWatchdog(5000);
hamid567 8:b5fb9681869c 27 setResponseTime(LDC_RESPONSE_6144);
hamid567 8:b5fb9681869c 28 setOutputPower(LDC_AMPLITUDE_4V);
hamid567 11:0f53fbf73613 29
hamid567 10:4fa62f8092c4 30 writeSPIregister(0x05,0x00); // clock config >> we get 0x00 if this line is disabled and the cable is reconnected
hamid567 11:0f53fbf73613 31 writeSPIregister(0x0C,0x01); // Register 0x0C enables a function that can improve L measurements while disabling RP measurements
hamid567 10:4fa62f8092c4 32
hamid567 5:98d4fd07734a 33 mode(LDC_MODE_ACTIVE);
vsluiter 0:90873b4e8330 34 }
vsluiter 0:90873b4e8330 35
vsluiter 0:90873b4e8330 36 void LDC1000::setOutputPower(LDC_AMPLITUDE amplitude)
vsluiter 0:90873b4e8330 37 {
vsluiter 0:90873b4e8330 38 uint8_t buffer;
vsluiter 0:90873b4e8330 39 _amplitude = amplitude;
vsluiter 0:90873b4e8330 40 readSPI(&buffer, 0x04);
vsluiter 0:90873b4e8330 41 buffer &= 0xE7; //clear amplitude bits
hamid567 8:b5fb9681869c 42 buffer |= (amplitude<<3) & 0x18;
vsluiter 0:90873b4e8330 43 writeSPI(&buffer,0x04);
vsluiter 0:90873b4e8330 44
vsluiter 0:90873b4e8330 45 }
vsluiter 0:90873b4e8330 46
hamid567 2:44b76f6f19d5 47 void LDC1000::setWatchdog(float frequency)
hamid567 2:44b76f6f19d5 48 {
hamid567 2:44b76f6f19d5 49 uint8_t buffer;
hamid567 2:44b76f6f19d5 50 buffer = 68.94*log(frequency/2500);
hamid567 2:44b76f6f19d5 51 writeSPI(&buffer,0x03);
hamid567 2:44b76f6f19d5 52 }
hamid567 1:a88df80e7664 53
vsluiter 0:90873b4e8330 54 void LDC1000::setResponseTime(LDC_RESPONSE responsetime)
vsluiter 0:90873b4e8330 55 {
vsluiter 0:90873b4e8330 56 uint8_t buffer;
vsluiter 0:90873b4e8330 57 _responsetime = responsetime;
vsluiter 0:90873b4e8330 58 readSPI(&buffer, 0x04);
vsluiter 0:90873b4e8330 59 buffer &= 0xF8; //clear responsetime bits
hamid567 5:98d4fd07734a 60 buffer |= responsetime & 0x07;
hamid567 8:b5fb9681869c 61 //writeSPIregister(0x04,buffer);
vsluiter 0:90873b4e8330 62 writeSPI(&buffer,0x04);
vsluiter 0:90873b4e8330 63 }
vsluiter 0:90873b4e8330 64
vsluiter 0:90873b4e8330 65 void LDC1000::setFrequency(float frequency)
vsluiter 0:90873b4e8330 66 {
vsluiter 0:90873b4e8330 67 _frequency = frequency;
vsluiter 0:90873b4e8330 68 _clock.period(1.0/frequency);
hamid567 4:62ebb87678f8 69 _clock.pulsewidth(0.5/frequency);
vsluiter 0:90873b4e8330 70 }
vsluiter 0:90873b4e8330 71
vsluiter 0:90873b4e8330 72 float LDC1000::getInductance()
vsluiter 0:90873b4e8330 73 {
hamid567 8:b5fb9681869c 74 uint16_t resp[] = {0,0,192, 384, 768, 1536, 3072, 6144};
vsluiter 0:90873b4e8330 75 _raw_l = readRawCounts();
vsluiter 0:90873b4e8330 76 _fsensor = (_frequency/(_raw_l*3.0))*resp[(uint8_t)(_responsetime)];
hamid567 2:44b76f6f19d5 77 return 1./(cap*pow(2*PI*_fsensor,2));
vsluiter 0:90873b4e8330 78 };
vsluiter 0:90873b4e8330 79
hamid567 8:b5fb9681869c 80
hamid567 9:6e2d808b113d 81 /* reads all 5 registers also after cable reconnect but het returns just one byte*/
hamid567 8:b5fb9681869c 82 uint32_t LDC1000::readRawCounts(void)
hamid567 8:b5fb9681869c 83 {
hamid567 8:b5fb9681869c 84 uint8_t val[5];
hamid567 8:b5fb9681869c 85 readSPI(val,0x21,5);
hamid567 9:6e2d808b113d 86 unsigned int combinedbytes = (val[4]<<16)| (val[3]<<8) | val[2]; // combine the 3 bytes from registers 23, 24 and 25
hamid567 9:6e2d808b113d 87 return combinedbytes;
hamid567 8:b5fb9681869c 88 }
hamid567 8:b5fb9681869c 89
vsluiter 0:90873b4e8330 90 void LDC1000::readSPI(uint8_t *data, uint8_t address, uint8_t num_bytes)
vsluiter 0:90873b4e8330 91 {
vsluiter 0:90873b4e8330 92 _cs_pin.write(0);
vsluiter 0:90873b4e8330 93 _spiport.write(address | 0x80); //read flag
vsluiter 0:90873b4e8330 94 for(int i=0; i < num_bytes ; i++)
vsluiter 0:90873b4e8330 95 {
hamid567 1:a88df80e7664 96 data[i] = _spiport.write(0xFF);
vsluiter 0:90873b4e8330 97 }
vsluiter 0:90873b4e8330 98 _cs_pin.write(1);
vsluiter 0:90873b4e8330 99 }
vsluiter 0:90873b4e8330 100
vsluiter 0:90873b4e8330 101 void LDC1000::writeSPI(uint8_t *data, uint8_t address, uint8_t num_bytes)
vsluiter 0:90873b4e8330 102 {
vsluiter 0:90873b4e8330 103 _cs_pin.write(0);
vsluiter 0:90873b4e8330 104 _spiport.write(address);
vsluiter 0:90873b4e8330 105 for(int i=0; i < num_bytes ; i++)
vsluiter 0:90873b4e8330 106 {
hamid567 1:a88df80e7664 107 _spiport.write(data[i]);
vsluiter 0:90873b4e8330 108 }
vsluiter 0:90873b4e8330 109 _cs_pin.write(1);
hamid567 8:b5fb9681869c 110 }
hamid567 8:b5fb9681869c 111
hamid567 11:0f53fbf73613 112
hamid567 11:0f53fbf73613 113 // EXTRA test: Get&print values of all variables to verify (to calculate the induction)
hamid567 11:0f53fbf73613 114 // The data will be printed on the screen using RealTerm: baud 9600.
hamid567 8:b5fb9681869c 115 // Begin ***********************************************************
hamid567 8:b5fb9681869c 116 float LDC1000::get_raw_l() {_raw_l = readRawCounts();
hamid567 8:b5fb9681869c 117 return _raw_l;};
hamid567 8:b5fb9681869c 118 float LDC1000::get_fsensor() {
hamid567 8:b5fb9681869c 119 uint16_t resp[] = {0, 0, 192, 384, 768, 1536, 3072, 6144};
hamid567 8:b5fb9681869c 120 _raw_l = readRawCounts();
hamid567 8:b5fb9681869c 121 _fsensor = (_frequency/(_raw_l*3.0))*resp[(uint8_t)(_responsetime)];
hamid567 8:b5fb9681869c 122 return _fsensor;};
hamid567 8:b5fb9681869c 123
hamid567 8:b5fb9681869c 124 float LDC1000::get_frequency() {return _frequency;};
hamid567 8:b5fb9681869c 125 float LDC1000::get_responsetime() {return _responsetime;};
hamid567 8:b5fb9681869c 126 float LDC1000::get_cap() {return cap;};
hamid567 8:b5fb9681869c 127 // END ***********************************************************
hamid567 8:b5fb9681869c 128