Library to communicate with LDC1614
Dependents: Inductive_Sensor_3
Fork of LDC1101 by
LDC1101.cpp@17:a5cf2b4bec13, 2015-12-12 (annotated)
- Committer:
- bobgiesberts
- Date:
- Sat Dec 12 11:26:23 2015 +0000
- Revision:
- 17:a5cf2b4bec13
- Parent:
- 16:07d0e43c2d12
- Child:
- 18:fc9bb81a631f
Including SD File system
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
bobgiesberts | 16:07d0e43c2d12 | 1 | /** |
bobgiesberts | 16:07d0e43c2d12 | 2 | * @file LDC1101.cpp |
bobgiesberts | 16:07d0e43c2d12 | 3 | * @brief this C++ file contains all required |
bobgiesberts | 16:07d0e43c2d12 | 4 | * functions to interface with Texas |
bobgiesberts | 16:07d0e43c2d12 | 5 | * Instruments' LDC1101. |
bobgiesberts | 16:07d0e43c2d12 | 6 | * |
bobgiesberts | 16:07d0e43c2d12 | 7 | * @author Victor Sluiter |
bobgiesberts | 16:07d0e43c2d12 | 8 | * |
bobgiesberts | 16:07d0e43c2d12 | 9 | * @date 2015-12-09 |
bobgiesberts | 16:07d0e43c2d12 | 10 | */ |
bobgiesberts | 16:07d0e43c2d12 | 11 | |
bobgiesberts | 16:07d0e43c2d12 | 12 | #include "LDC1101.h" |
bobgiesberts | 16:07d0e43c2d12 | 13 | |
bobgiesberts | 16:07d0e43c2d12 | 14 | |
bobgiesberts | 17:a5cf2b4bec13 | 15 | LDC1101::LDC1101(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) |
bobgiesberts | 16:07d0e43c2d12 | 16 | { |
bobgiesberts | 16:07d0e43c2d12 | 17 | |
bobgiesberts | 16:07d0e43c2d12 | 18 | cap = capacitor; |
bobgiesberts | 16:07d0e43c2d12 | 19 | _spiport.format(8,3); |
bobgiesberts | 16:07d0e43c2d12 | 20 | _spiport.frequency(1E6); |
bobgiesberts | 16:07d0e43c2d12 | 21 | setFrequency(f_external); |
bobgiesberts | 16:07d0e43c2d12 | 22 | |
bobgiesberts | 16:07d0e43c2d12 | 23 | // ---CSB must go low before accessing first address??? |
bobgiesberts | 16:07d0e43c2d12 | 24 | _cs_pin.write(1); |
bobgiesberts | 16:07d0e43c2d12 | 25 | wait_us(100); |
bobgiesberts | 16:07d0e43c2d12 | 26 | |
bobgiesberts | 16:07d0e43c2d12 | 27 | init(); |
bobgiesberts | 16:07d0e43c2d12 | 28 | } |
bobgiesberts | 16:07d0e43c2d12 | 29 | |
bobgiesberts | 16:07d0e43c2d12 | 30 | void LDC1101::init() |
bobgiesberts | 16:07d0e43c2d12 | 31 | { |
bobgiesberts | 16:07d0e43c2d12 | 32 | // configuration |
bobgiesberts | 16:07d0e43c2d12 | 33 | mode(LDC_MODE_STANDBY); // 0x01 naar 0x0B |
bobgiesberts | 16:07d0e43c2d12 | 34 | |
bobgiesberts | 16:07d0e43c2d12 | 35 | wait(0.1); |
bobgiesberts | 16:07d0e43c2d12 | 36 | wait_us(10); |
bobgiesberts | 16:07d0e43c2d12 | 37 | |
bobgiesberts | 16:07d0e43c2d12 | 38 | setResponseTime(LDC_RESPONSE_6144); |
bobgiesberts | 17:a5cf2b4bec13 | 39 | setDivider(DIVIDER_1); |
bobgiesberts | 16:07d0e43c2d12 | 40 | |
bobgiesberts | 16:07d0e43c2d12 | 41 | // L-Only Measurement |
bobgiesberts | 16:07d0e43c2d12 | 42 | writeSPIregister(0x05, 0x03); // ALT_CONFIG: clock config >> we get 0x00 if this line is disabled and the cable is reconnected |
bobgiesberts | 16:07d0e43c2d12 | 43 | writeSPIregister(0x0C, 0x01); // D_CONF: Register 0x0C enables a function that can improve L measurements while disabling RP measurements |
bobgiesberts | 16:07d0e43c2d12 | 44 | |
bobgiesberts | 16:07d0e43c2d12 | 45 | // High Resolution Reference Count |
bobgiesberts | 16:07d0e43c2d12 | 46 | // LHR_COUNT_LSB: 0xff naar 0x30 ??? |
bobgiesberts | 16:07d0e43c2d12 | 47 | // LHR_COUNT_MSB: 0xff naar 0x31 ??? |
bobgiesberts | 16:07d0e43c2d12 | 48 | |
bobgiesberts | 16:07d0e43c2d12 | 49 | // Start measuring |
bobgiesberts | 16:07d0e43c2d12 | 50 | mode(LDC_MODE_ACTIVE); // 0x00 naar 0x0B |
bobgiesberts | 16:07d0e43c2d12 | 51 | } |
bobgiesberts | 16:07d0e43c2d12 | 52 | |
bobgiesberts | 16:07d0e43c2d12 | 53 | void LDC1101::setResponseTime(LDC_RESPONSE responsetime) |
bobgiesberts | 16:07d0e43c2d12 | 54 | { |
bobgiesberts | 16:07d0e43c2d12 | 55 | _responsetime = responsetime; |
bobgiesberts | 16:07d0e43c2d12 | 56 | writeSPIregister(0x04, responsetime); |
bobgiesberts | 16:07d0e43c2d12 | 57 | } |
bobgiesberts | 16:07d0e43c2d12 | 58 | |
bobgiesberts | 17:a5cf2b4bec13 | 59 | void LDC1101::setDivider(DIVIDER div) |
bobgiesberts | 17:a5cf2b4bec13 | 60 | { |
bobgiesberts | 17:a5cf2b4bec13 | 61 | // _divider = (float) pow(2, div); |
bobgiesberts | 17:a5cf2b4bec13 | 62 | writeSPIregister(0x34, div); |
bobgiesberts | 17:a5cf2b4bec13 | 63 | } |
bobgiesberts | 17:a5cf2b4bec13 | 64 | |
bobgiesberts | 17:a5cf2b4bec13 | 65 | |
bobgiesberts | 16:07d0e43c2d12 | 66 | void LDC1101::setFrequency(float frequency) |
bobgiesberts | 16:07d0e43c2d12 | 67 | { |
bobgiesberts | 16:07d0e43c2d12 | 68 | _frequency = frequency; |
bobgiesberts | 17:a5cf2b4bec13 | 69 | //_clock.period(1.0/frequency); |
bobgiesberts | 17:a5cf2b4bec13 | 70 | //_clock.pulsewidth(0.5/frequency); |
bobgiesberts | 16:07d0e43c2d12 | 71 | } |
bobgiesberts | 16:07d0e43c2d12 | 72 | |
bobgiesberts | 16:07d0e43c2d12 | 73 | float LDC1101::getInductance() |
bobgiesberts | 16:07d0e43c2d12 | 74 | { |
bobgiesberts | 16:07d0e43c2d12 | 75 | uint16_t resp[] = {0,0,192, 384, 768, 1536, 3072, 6144}; |
bobgiesberts | 16:07d0e43c2d12 | 76 | _raw_l = readRawCounts(); |
bobgiesberts | 16:07d0e43c2d12 | 77 | |
bobgiesberts | 17:a5cf2b4bec13 | 78 | // f_CLKIN * RESP_TIME |
bobgiesberts | 17:a5cf2b4bec13 | 79 | // f_sensor = ------------------- |
bobgiesberts | 17:a5cf2b4bec13 | 80 | // 3 * L_DATA |
bobgiesberts | 17:a5cf2b4bec13 | 81 | _fsensor = 1 *(_frequency/(_raw_l*3.0))*resp[(uint8_t)(_responsetime)]; |
bobgiesberts | 17:a5cf2b4bec13 | 82 | |
bobgiesberts | 17:a5cf2b4bec13 | 83 | // 2^SENSORDIV * f_CLKIN(L_DATA + LHROFFSET*2^8) |
bobgiesberts | 17:a5cf2b4bec13 | 84 | // f_sensor = --------------------------------------------- |
bobgiesberts | 17:a5cf2b4bec13 | 85 | // 2^24 |
bobgiesberts | 16:07d0e43c2d12 | 86 | |
bobgiesberts | 16:07d0e43c2d12 | 87 | // 1 |
bobgiesberts | 16:07d0e43c2d12 | 88 | // --------------------- --> p. 31 |
bobgiesberts | 16:07d0e43c2d12 | 89 | // C * (2*PI*f_sensor)^2 |
bobgiesberts | 16:07d0e43c2d12 | 90 | return 1./(cap*pow(2*PI*_fsensor,2)); |
bobgiesberts | 16:07d0e43c2d12 | 91 | }; |
bobgiesberts | 16:07d0e43c2d12 | 92 | |
bobgiesberts | 16:07d0e43c2d12 | 93 | |
bobgiesberts | 16:07d0e43c2d12 | 94 | uint32_t LDC1101::readRawCounts(void) |
bobgiesberts | 16:07d0e43c2d12 | 95 | { |
bobgiesberts | 16:07d0e43c2d12 | 96 | uint8_t val[5]; |
bobgiesberts | 16:07d0e43c2d12 | 97 | |
bobgiesberts | 16:07d0e43c2d12 | 98 | // 0x38 + 0x39 + 0x3A |
bobgiesberts | 16:07d0e43c2d12 | 99 | readSPI(val, 0x38, 5); |
bobgiesberts | 16:07d0e43c2d12 | 100 | uint32_t combinedbytes = (val[4]<<16)| (val[3]<<8) | val[2]; // combine the content of the 3 bytes from registers 23, 24 and 25 |
bobgiesberts | 16:07d0e43c2d12 | 101 | return combinedbytes; |
bobgiesberts | 16:07d0e43c2d12 | 102 | } |
bobgiesberts | 16:07d0e43c2d12 | 103 | |
bobgiesberts | 16:07d0e43c2d12 | 104 | void LDC1101::readSPI(uint8_t *data, uint8_t address, uint8_t num_bytes) |
bobgiesberts | 16:07d0e43c2d12 | 105 | { |
bobgiesberts | 16:07d0e43c2d12 | 106 | // CSB down |
bobgiesberts | 16:07d0e43c2d12 | 107 | _cs_pin.write(0); |
bobgiesberts | 16:07d0e43c2d12 | 108 | |
bobgiesberts | 16:07d0e43c2d12 | 109 | // makes sure the address starts with 1... Why? |
bobgiesberts | 16:07d0e43c2d12 | 110 | _spiport.write(address | 0x80); //read flag |
bobgiesberts | 16:07d0e43c2d12 | 111 | for(int i=0; i < num_bytes ; i++) |
bobgiesberts | 16:07d0e43c2d12 | 112 | { |
bobgiesberts | 16:07d0e43c2d12 | 113 | data[i] = _spiport.write(0xFF); |
bobgiesberts | 16:07d0e43c2d12 | 114 | } |
bobgiesberts | 16:07d0e43c2d12 | 115 | // CSB up |
bobgiesberts | 16:07d0e43c2d12 | 116 | _cs_pin.write(1); |
bobgiesberts | 16:07d0e43c2d12 | 117 | } |
bobgiesberts | 16:07d0e43c2d12 | 118 | |
bobgiesberts | 16:07d0e43c2d12 | 119 | void LDC1101::writeSPI(uint8_t *data, uint8_t address, uint8_t num_bytes) |
bobgiesberts | 16:07d0e43c2d12 | 120 | { |
bobgiesberts | 16:07d0e43c2d12 | 121 | // CSB down |
bobgiesberts | 16:07d0e43c2d12 | 122 | _cs_pin.write(0); |
bobgiesberts | 16:07d0e43c2d12 | 123 | |
bobgiesberts | 16:07d0e43c2d12 | 124 | _spiport.write(address); |
bobgiesberts | 16:07d0e43c2d12 | 125 | for(int i=0; i < num_bytes ; i++) |
bobgiesberts | 16:07d0e43c2d12 | 126 | { |
bobgiesberts | 16:07d0e43c2d12 | 127 | _spiport.write(data[i]); |
bobgiesberts | 16:07d0e43c2d12 | 128 | } |
bobgiesberts | 16:07d0e43c2d12 | 129 | // CSB up |
bobgiesberts | 16:07d0e43c2d12 | 130 | _cs_pin.write(1); |
bobgiesberts | 16:07d0e43c2d12 | 131 | } |
bobgiesberts | 16:07d0e43c2d12 | 132 | |
bobgiesberts | 16:07d0e43c2d12 | 133 | |
bobgiesberts | 16:07d0e43c2d12 | 134 | // EXTRA test: Get&print values of all variables to verify (to calculate the induction) |
bobgiesberts | 16:07d0e43c2d12 | 135 | // The data will be printed on the screen using RealTerm: baud 9600. |
bobgiesberts | 16:07d0e43c2d12 | 136 | // Begin *********************************************************** |
bobgiesberts | 16:07d0e43c2d12 | 137 | float LDC1101::get_raw_l() {_raw_l = readRawCounts(); |
bobgiesberts | 16:07d0e43c2d12 | 138 | return _raw_l;}; |
bobgiesberts | 16:07d0e43c2d12 | 139 | float LDC1101::get_fsensor() { |
bobgiesberts | 16:07d0e43c2d12 | 140 | uint16_t resp[] = {0, 0, 192, 384, 768, 1536, 3072, 6144}; |
bobgiesberts | 16:07d0e43c2d12 | 141 | _raw_l = readRawCounts(); |
bobgiesberts | 16:07d0e43c2d12 | 142 | _fsensor = (_frequency/(_raw_l*3.0))*resp[(uint8_t)(_responsetime)]; |
bobgiesberts | 16:07d0e43c2d12 | 143 | return _fsensor;}; |
bobgiesberts | 16:07d0e43c2d12 | 144 | |
bobgiesberts | 16:07d0e43c2d12 | 145 | float LDC1101::get_frequency() {return _frequency;}; |
bobgiesberts | 16:07d0e43c2d12 | 146 | float LDC1101::get_responsetime() {return _responsetime;}; |
bobgiesberts | 16:07d0e43c2d12 | 147 | float LDC1101::get_cap() {return cap;}; |
bobgiesberts | 16:07d0e43c2d12 | 148 | // END *********************************************************** |