Bob Giesberts / LDC1614

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Dependencies:   SHTx

Dependents:   Inductive_Sensor_3

Fork of LDC1101 by Bob Giesberts

LDC1000.cpp@5:98d4fd07734a, 2015-05-26 (annotated)

Committer:
hamid567
Date:
Tue May 26 14:34:05 2015 +0000
Revision:
5:98d4fd07734a
Parent:
4:62ebb87678f8
Child:
6:5b6ad98d6436
Set mode to standby before writing registers. Counter 1..0 not changing ?

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 5:98d4fd07734a 21 mode(LDC_MODE_STANDBY);
hamid567 5:98d4fd07734a 22 setFrequency(f_external);
hamid567 5:98d4fd07734a 23 wait(0.1);
hamid567 5:98d4fd07734a 24 setOutputPower(LDC_AMPLITUDE_4V);
hamid567 1:a88df80e7664 25 wait_us(10);
vsluiter 0:90873b4e8330 26 setResponseTime(LDC_RESPONSE_384);
hamid567 2:44b76f6f19d5 27 setWatchdog(5000);
hamid567 5:98d4fd07734a 28
hamid567 5:98d4fd07734a 29 // Write comando's like in EVM start log:
hamid567 5:98d4fd07734a 30 /* writeSPIregister(0x0B,0x00);
hamid567 5:98d4fd07734a 31 writeSPIregister(0x01,0x0E);
hamid567 5:98d4fd07734a 32 writeSPIregister(0x02,0x3C);
hamid567 5:98d4fd07734a 33 writeSPIregister(0x03,0x15);
hamid567 5:98d4fd07734a 34 writeSPIregister(0x04,0x17);
hamid567 5:98d4fd07734a 35 writeSPIregister(0x05,0x00);
hamid567 5:98d4fd07734a 36 writeSPIregister(0x06,0x50);
hamid567 5:98d4fd07734a 37 writeSPIregister(0x07,0x14);
hamid567 5:98d4fd07734a 38 writeSPIregister(0x08,0xC0);
hamid567 5:98d4fd07734a 39 writeSPIregister(0x09,0x12);
hamid567 5:98d4fd07734a 40 writeSPIregister(0x0A,0x04);
hamid567 5:98d4fd07734a 41 // writeSPIregister(0x0C,0x01);
hamid567 5:98d4fd07734a 42 writeSPIregister(0x0B,0x01);*/
hamid567 5:98d4fd07734a 43
hamid567 5:98d4fd07734a 44 mode(LDC_MODE_ACTIVE);
vsluiter 0:90873b4e8330 45 }
vsluiter 0:90873b4e8330 46
vsluiter 0:90873b4e8330 47 void LDC1000::setOutputPower(LDC_AMPLITUDE amplitude)
vsluiter 0:90873b4e8330 48 {
vsluiter 0:90873b4e8330 49 uint8_t buffer;
vsluiter 0:90873b4e8330 50 _amplitude = amplitude;
vsluiter 0:90873b4e8330 51 readSPI(&buffer, 0x04);
vsluiter 0:90873b4e8330 52 buffer &= 0xE7; //clear amplitude bits
vsluiter 0:90873b4e8330 53 buffer |= (amplitude<<3) & 0xE7;
vsluiter 0:90873b4e8330 54 writeSPI(&buffer,0x04);
vsluiter 0:90873b4e8330 55
vsluiter 0:90873b4e8330 56 }
vsluiter 0:90873b4e8330 57
hamid567 2:44b76f6f19d5 58 void LDC1000::setWatchdog(float frequency)
hamid567 2:44b76f6f19d5 59 {
hamid567 2:44b76f6f19d5 60 uint8_t buffer;
hamid567 2:44b76f6f19d5 61 buffer = 68.94*log(frequency/2500);
hamid567 2:44b76f6f19d5 62 writeSPI(&buffer,0x03);
hamid567 1:a88df80e7664 63
hamid567 2:44b76f6f19d5 64 }
hamid567 1:a88df80e7664 65
vsluiter 0:90873b4e8330 66 void LDC1000::setResponseTime(LDC_RESPONSE responsetime)
vsluiter 0:90873b4e8330 67 {
vsluiter 0:90873b4e8330 68 uint8_t buffer;
vsluiter 0:90873b4e8330 69 _responsetime = responsetime;
vsluiter 0:90873b4e8330 70 readSPI(&buffer, 0x04);
vsluiter 0:90873b4e8330 71 buffer &= 0xF8; //clear responsetime bits
hamid567 5:98d4fd07734a 72 buffer |= responsetime & 0x07;
vsluiter 0:90873b4e8330 73 writeSPI(&buffer,0x04);
vsluiter 0:90873b4e8330 74 }
vsluiter 0:90873b4e8330 75
vsluiter 0:90873b4e8330 76 void LDC1000::setFrequency(float frequency)
vsluiter 0:90873b4e8330 77 {
vsluiter 0:90873b4e8330 78 _frequency = frequency;
vsluiter 0:90873b4e8330 79 _clock.period(1.0/frequency);
hamid567 4:62ebb87678f8 80 _clock.pulsewidth(0.5/frequency);
vsluiter 0:90873b4e8330 81 }
vsluiter 0:90873b4e8330 82
vsluiter 0:90873b4e8330 83 float LDC1000::getInductance()
vsluiter 0:90873b4e8330 84 {
vsluiter 0:90873b4e8330 85 uint16_t resp[] = {192, 384, 768, 1536, 3072, 6144};
vsluiter 0:90873b4e8330 86 _raw_l = readRawCounts();
vsluiter 0:90873b4e8330 87 _fsensor = (_frequency/(_raw_l*3.0))*resp[(uint8_t)(_responsetime)];
hamid567 2:44b76f6f19d5 88 return 1./(cap*pow(2*PI*_fsensor,2));
vsluiter 0:90873b4e8330 89 };
vsluiter 0:90873b4e8330 90
vsluiter 0:90873b4e8330 91 uint32_t LDC1000::readRawCounts(void)
vsluiter 0:90873b4e8330 92 {
vsluiter 0:90873b4e8330 93 union
vsluiter 0:90873b4e8330 94 {
vsluiter 0:90873b4e8330 95 uint8_t buf[4];
vsluiter 0:90873b4e8330 96 uint32_t value;
vsluiter 0:90873b4e8330 97 } val;
vsluiter 0:90873b4e8330 98 val.value = 0;
vsluiter 0:90873b4e8330 99 readSPI(val.buf,0x23,3);
vsluiter 0:90873b4e8330 100 return val.value;
vsluiter 0:90873b4e8330 101 }
vsluiter 0:90873b4e8330 102
hamid567 5:98d4fd07734a 103
hamid567 5:98d4fd07734a 104
vsluiter 0:90873b4e8330 105 void LDC1000::readSPI(uint8_t *data, uint8_t address, uint8_t num_bytes)
vsluiter 0:90873b4e8330 106 {
vsluiter 0:90873b4e8330 107 _cs_pin.write(0);
vsluiter 0:90873b4e8330 108 _spiport.write(address | 0x80); //read flag
vsluiter 0:90873b4e8330 109 for(int i=0; i < num_bytes ; i++)
vsluiter 0:90873b4e8330 110 {
hamid567 1:a88df80e7664 111 data[i] = _spiport.write(0xFF);
vsluiter 0:90873b4e8330 112 }
vsluiter 0:90873b4e8330 113 _cs_pin.write(1);
vsluiter 0:90873b4e8330 114 }
vsluiter 0:90873b4e8330 115
vsluiter 0:90873b4e8330 116 void LDC1000::writeSPI(uint8_t *data, uint8_t address, uint8_t num_bytes)
vsluiter 0:90873b4e8330 117 {
vsluiter 0:90873b4e8330 118 _cs_pin.write(0);
vsluiter 0:90873b4e8330 119 _spiport.write(address);
vsluiter 0:90873b4e8330 120 for(int i=0; i < num_bytes ; i++)
vsluiter 0:90873b4e8330 121 {
hamid567 1:a88df80e7664 122 _spiport.write(data[i]);
vsluiter 0:90873b4e8330 123 }
vsluiter 0:90873b4e8330 124 _cs_pin.write(1);
vsluiter 0:90873b4e8330 125 }