Bob Giesberts / LDC1614

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Dependencies:   SHTx

Dependents:   Inductive_Sensor_3

Fork of LDC1101 by Bob Giesberts

LDC1000.cpp@12:312970050c8c, 2015-06-01 (annotated)

Committer:
hamid567
Date:
Mon Jun 01 08:21:11 2015 +0000
Revision:
12:312970050c8c
Parent:
11:0f53fbf73613 
Working example

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
hamid567 2:44b76f6f19d5 46 void LDC1000::setWatchdog(float frequency)
hamid567 2:44b76f6f19d5 47 {
hamid567 2:44b76f6f19d5 48 uint8_t buffer;
hamid567 2:44b76f6f19d5 49 buffer = 68.94*log(frequency/2500);
hamid567 2:44b76f6f19d5 50 writeSPI(&buffer,0x03);
hamid567 2:44b76f6f19d5 51 }
hamid567 1:a88df80e7664 52
vsluiter 0:90873b4e8330 53 void LDC1000::setResponseTime(LDC_RESPONSE responsetime)
vsluiter 0:90873b4e8330 54 {
vsluiter 0:90873b4e8330 55 uint8_t buffer;
vsluiter 0:90873b4e8330 56 _responsetime = responsetime;
vsluiter 0:90873b4e8330 57 readSPI(&buffer, 0x04);
vsluiter 0:90873b4e8330 58 buffer &= 0xF8; //clear responsetime bits
hamid567 5:98d4fd07734a 59 buffer |= responsetime & 0x07;
hamid567 8:b5fb9681869c 60 //writeSPIregister(0x04,buffer);
vsluiter 0:90873b4e8330 61 writeSPI(&buffer,0x04);
vsluiter 0:90873b4e8330 62 }
vsluiter 0:90873b4e8330 63
vsluiter 0:90873b4e8330 64 void LDC1000::setFrequency(float frequency)
vsluiter 0:90873b4e8330 65 {
vsluiter 0:90873b4e8330 66 _frequency = frequency;
vsluiter 0:90873b4e8330 67 _clock.period(1.0/frequency);
hamid567 4:62ebb87678f8 68 _clock.pulsewidth(0.5/frequency);
vsluiter 0:90873b4e8330 69 }
vsluiter 0:90873b4e8330 70
vsluiter 0:90873b4e8330 71 float LDC1000::getInductance()
vsluiter 0:90873b4e8330 72 {
hamid567 8:b5fb9681869c 73 uint16_t resp[] = {0,0,192, 384, 768, 1536, 3072, 6144};
vsluiter 0:90873b4e8330 74 _raw_l = readRawCounts();
vsluiter 0:90873b4e8330 75 _fsensor = (_frequency/(_raw_l*3.0))*resp[(uint8_t)(_responsetime)];
hamid567 2:44b76f6f19d5 76 return 1./(cap*pow(2*PI*_fsensor,2));
vsluiter 0:90873b4e8330 77 };
vsluiter 0:90873b4e8330 78
hamid567 8:b5fb9681869c 79
hamid567 8:b5fb9681869c 80 uint32_t LDC1000::readRawCounts(void)
hamid567 8:b5fb9681869c 81 {
hamid567 8:b5fb9681869c 82 uint8_t val[5];
hamid567 8:b5fb9681869c 83 readSPI(val,0x21,5);
hamid567 12:312970050c8c 84 uint32_t combinedbytes = (val[4]<<16)| (val[3]<<8) | val[2]; // combine the content of the 3 bytes from registers 23, 24 and 25
hamid567 9:6e2d808b113d 85 return combinedbytes;
hamid567 8:b5fb9681869c 86 }
hamid567 8:b5fb9681869c 87
vsluiter 0:90873b4e8330 88 void LDC1000::readSPI(uint8_t *data, uint8_t address, uint8_t num_bytes)
vsluiter 0:90873b4e8330 89 {
vsluiter 0:90873b4e8330 90 _cs_pin.write(0);
vsluiter 0:90873b4e8330 91 _spiport.write(address | 0x80); //read flag
vsluiter 0:90873b4e8330 92 for(int i=0; i < num_bytes ; i++)
vsluiter 0:90873b4e8330 93 {
hamid567 1:a88df80e7664 94 data[i] = _spiport.write(0xFF);
vsluiter 0:90873b4e8330 95 }
vsluiter 0:90873b4e8330 96 _cs_pin.write(1);
vsluiter 0:90873b4e8330 97 }
vsluiter 0:90873b4e8330 98
vsluiter 0:90873b4e8330 99 void LDC1000::writeSPI(uint8_t *data, uint8_t address, uint8_t num_bytes)
vsluiter 0:90873b4e8330 100 {
vsluiter 0:90873b4e8330 101 _cs_pin.write(0);
vsluiter 0:90873b4e8330 102 _spiport.write(address);
vsluiter 0:90873b4e8330 103 for(int i=0; i < num_bytes ; i++)
vsluiter 0:90873b4e8330 104 {
hamid567 1:a88df80e7664 105 _spiport.write(data[i]);
vsluiter 0:90873b4e8330 106 }
vsluiter 0:90873b4e8330 107 _cs_pin.write(1);
hamid567 8:b5fb9681869c 108 }
hamid567 8:b5fb9681869c 109
hamid567 11:0f53fbf73613 110
hamid567 11:0f53fbf73613 111 // EXTRA test: Get&print values of all variables to verify (to calculate the induction)
hamid567 11:0f53fbf73613 112 // The data will be printed on the screen using RealTerm: baud 9600.
hamid567 8:b5fb9681869c 113 // Begin ***********************************************************
hamid567 8:b5fb9681869c 114 float LDC1000::get_raw_l() {_raw_l = readRawCounts();
hamid567 8:b5fb9681869c 115 return _raw_l;};
hamid567 8:b5fb9681869c 116 float LDC1000::get_fsensor() {
hamid567 8:b5fb9681869c 117 uint16_t resp[] = {0, 0, 192, 384, 768, 1536, 3072, 6144};
hamid567 8:b5fb9681869c 118 _raw_l = readRawCounts();
hamid567 8:b5fb9681869c 119 _fsensor = (_frequency/(_raw_l*3.0))*resp[(uint8_t)(_responsetime)];
hamid567 8:b5fb9681869c 120 return _fsensor;};
hamid567 8:b5fb9681869c 121
hamid567 8:b5fb9681869c 122 float LDC1000::get_frequency() {return _frequency;};
hamid567 8:b5fb9681869c 123 float LDC1000::get_responsetime() {return _responsetime;};
hamid567 8:b5fb9681869c 124 float LDC1000::get_cap() {return cap;};
hamid567 12:312970050c8c 125 // END ***********************************************************