Matthias Grob & Manuel Stalder / Mbed 2 deprecated DecaWave

This is the DW1000 driver and our self developed distance measurement application based on it. We do this as a semester thesis at ETH Zürich under the Automatic Control Laboratory in the Department of electrical engineering.

Dependencies:   mbed

DW1000/DW1000.cpp@11:c87d37db2c6f, 2014-11-23 (annotated)

Committer:
manumaet
Date:
Sun Nov 23 11:20:46 2014 +0000
Revision:
11:c87d37db2c6f
Parent:
10:d077bb12d259
Child:
12:985aa9843c3c
LDE fixed, receiver reset no more needed

Who changed what in which revision?

UserRevisionLine numberNew contents of line
manumaet 0:f50e671ffff7 1 #include "DW1000.h"
manumaet 0:f50e671ffff7 2
manumaet 8:7a9c61242e2f 3 DW1000::DW1000(PinName MOSI, PinName MISO, PinName SCLK, PinName CS, PinName IRQ) : spi(MOSI, MISO, SCLK), cs(CS), irq(IRQ) {
manumaet 0:f50e671ffff7 4 deselect(); // Chip must be deselected first
manumaet 0:f50e671ffff7 5 spi.format(8,0); // Setup the spi for standard 8 bit data and SPI-Mode 0 (GPIO5, GPIO6 open circuit or ground on DW1000)
manumaet 0:f50e671ffff7 6 spi.frequency(1000000); // with a 1MHz clock rate (worked up to 49MHz in our Test)
manumaet 7:e634eeafc4d2 7
manumaet 11:c87d37db2c6f 8 uint16_t ldeload[] = {0x0301, 0x8000, 0x0200};
manumaet 11:c87d37db2c6f 9 writeRegister(DW1000_PMSC, 0, (uint8_t*)&ldeload[0], 2); // initialise LDELOAD User Manual p22
manumaet 11:c87d37db2c6f 10 writeRegister(DW1000_OTP_IF, 0x06, (uint8_t*)&ldeload[1], 2);
manumaet 11:c87d37db2c6f 11 wait_us(150);
manumaet 11:c87d37db2c6f 12 writeRegister(DW1000_PMSC, 0, (uint8_t*)&ldeload[2], 2);
manumaet 11:c87d37db2c6f 13
manumaet 8:7a9c61242e2f 14 irq.rise(this, &DW1000::ISR); // attach Interrupt handler to rising edge
manumaet 8:7a9c61242e2f 15 resetRX();
manumaet 0:f50e671ffff7 16 }
manumaet 0:f50e671ffff7 17
manumaet 0:f50e671ffff7 18 uint32_t DW1000::getDeviceID() {
manumaet 0:f50e671ffff7 19 uint32_t result;
manumaet 0:f50e671ffff7 20 readRegister(DW1000_DEV_ID, 0, (uint8_t*)&result, 4);
manumaet 0:f50e671ffff7 21 return result;
manumaet 0:f50e671ffff7 22 }
manumaet 0:f50e671ffff7 23
manumaet 0:f50e671ffff7 24 uint64_t DW1000::getEUI() {
manumaet 0:f50e671ffff7 25 uint64_t result;
manumaet 0:f50e671ffff7 26 readRegister(DW1000_EUI, 0, (uint8_t*)&result, 8);
manumaet 0:f50e671ffff7 27 return result;
manumaet 0:f50e671ffff7 28 }
manumaet 0:f50e671ffff7 29
manumaet 0:f50e671ffff7 30 void DW1000::setEUI(uint64_t EUI) {
manumaet 0:f50e671ffff7 31 writeRegister(DW1000_EUI, 0, (uint8_t*)&EUI, 8);
manumaet 0:f50e671ffff7 32 }
manumaet 0:f50e671ffff7 33
manumaet 0:f50e671ffff7 34 float DW1000::getVoltage() {
manumaet 8:7a9c61242e2f 35 uint8_t buffer[7] = {0x80, 0x0A, 0x0F, 0x01, 0x00}; // algorithm form DW1000 User Manual p57
manumaet 0:f50e671ffff7 36 writeRegister(DW1000_RF_CONF, 0x11, buffer, 2);
manumaet 0:f50e671ffff7 37 writeRegister(DW1000_RF_CONF, 0x12, &buffer[2], 1);
manumaet 0:f50e671ffff7 38 writeRegister(DW1000_TX_CAL, 0x00, &buffer[3], 1);
manumaet 0:f50e671ffff7 39 writeRegister(DW1000_TX_CAL, 0x00, &buffer[4], 1);
manumaet 8:7a9c61242e2f 40 readRegister(DW1000_TX_CAL, 0x03, &buffer[5], 2); // get the 8-Bit readings for Voltage and Temperature
manumaet 0:f50e671ffff7 41 float Voltage = buffer[5] * 0.0057 + 2.3;
manumaet 8:7a9c61242e2f 42 float Temperature = buffer[6] * 1.13 - 113.0; // TODO: getTemperature was always ~35 degree with better formula/calibration see instance_common.c row 391
manumaet 0:f50e671ffff7 43 return Voltage;
manumaet 0:f50e671ffff7 44 }
manumaet 0:f50e671ffff7 45
manumaet 10:d077bb12d259 46 void DW1000::sendString(char* message) {
manumaet 10:d077bb12d259 47 sendFrame((uint8_t*)message, strlen(message)+1);
manumaet 10:d077bb12d259 48 }
manumaet 10:d077bb12d259 49
manumaet 10:d077bb12d259 50 char* DW1000::receiveString() {
manumaet 10:d077bb12d259 51 uint16_t framelength = 0; // get framelength
manumaet 10:d077bb12d259 52 readRegister(DW1000_RX_FINFO, 0, (uint8_t*)&framelength, 2);
manumaet 10:d077bb12d259 53 framelength = (framelength & 0x03FF) - 2; // take only the right bits and subtract the 2 CRC Bytes
manumaet 10:d077bb12d259 54 char* receive = new char[framelength]; // get data from buffer
manumaet 10:d077bb12d259 55 readRegister(DW1000_RX_BUFFER, 0, (uint8_t*)receive, framelength);
manumaet 10:d077bb12d259 56 return receive;
manumaet 10:d077bb12d259 57 }
manumaet 10:d077bb12d259 58
manumaet 11:c87d37db2c6f 59 void DW1000::sendFrame(uint8_t* message, uint16_t length) {
manumaet 10:d077bb12d259 60 writeRegister(DW1000_TX_BUFFER, 0, message, length); // fill buffer
manumaet 7:e634eeafc4d2 61
manumaet 11:c87d37db2c6f 62 uint8_t backup = readRegister8(DW1000_TX_FCTRL, 1);
manumaet 11:c87d37db2c6f 63 length += 2; // put length of frame including 2 CRC Bytes
manumaet 11:c87d37db2c6f 64 length = ((backup & 0xFC) << 8) | (length & 0x03FF);
manumaet 7:e634eeafc4d2 65
manumaet 11:c87d37db2c6f 66 writeRegister(DW1000_TX_FCTRL, 0, (uint8_t*)&length, 2); // TODO: make that bigger frames than 256 can be sent
manumaet 11:c87d37db2c6f 67
manumaet 11:c87d37db2c6f 68 writeRegister8(DW1000_SYS_CTRL, 0, 0x02); // trigger sending process by setting the TXSTRT bit
manumaet 8:7a9c61242e2f 69 }
manumaet 8:7a9c61242e2f 70
manumaet 8:7a9c61242e2f 71 void DW1000::receiveFrame() {
manumaet 8:7a9c61242e2f 72 writeRegister8(DW1000_SYS_CTRL, 1, 0x01); // start listening for preamble by setting the RXENAB bit
manumaet 7:e634eeafc4d2 73 }
manumaet 7:e634eeafc4d2 74
manumaet 7:e634eeafc4d2 75 void DW1000::ISR() {
manumaet 7:e634eeafc4d2 76 callbackRX();
manumaet 7:e634eeafc4d2 77 }
manumaet 7:e634eeafc4d2 78
manumaet 7:e634eeafc4d2 79 void DW1000::resetRX() {
manumaet 7:e634eeafc4d2 80 uint8_t resetrx = 0xE0; //set rx reset
manumaet 7:e634eeafc4d2 81 writeRegister(DW1000_PMSC, 3, &resetrx, 1);
manumaet 7:e634eeafc4d2 82 resetrx = 0xf0; //clear RX reset
manumaet 7:e634eeafc4d2 83 writeRegister(DW1000_PMSC, 3, &resetrx, 1);
manumaet 7:e634eeafc4d2 84 }
manumaet 0:f50e671ffff7 85
manumaet 0:f50e671ffff7 86 // SPI Interface ------------------------------------------------------------------------------------
manumaet 10:d077bb12d259 87 uint8_t DW1000::readRegister8(uint8_t reg, uint16_t subaddress) {
manumaet 10:d077bb12d259 88 uint8_t result;
manumaet 10:d077bb12d259 89 readRegister(reg, subaddress, &result, 1);
manumaet 10:d077bb12d259 90 return result;
manumaet 10:d077bb12d259 91 }
manumaet 10:d077bb12d259 92
manumaet 8:7a9c61242e2f 93 void DW1000::writeRegister8(uint8_t reg, uint16_t subaddress, uint8_t buffer) {
manumaet 8:7a9c61242e2f 94 writeRegister(reg, subaddress, &buffer, 1);
manumaet 8:7a9c61242e2f 95 }
manumaet 8:7a9c61242e2f 96
manumaet 8:7a9c61242e2f 97 void DW1000::readRegister(uint8_t reg, uint16_t subaddress, uint8_t *buffer, int length) {
manumaet 0:f50e671ffff7 98 setupTransaction(reg, subaddress, false);
manumaet 8:7a9c61242e2f 99 for(int i=0; i<length; i++) // get data
manumaet 0:f50e671ffff7 100 buffer[i] = spi.write(0x00);
manumaet 0:f50e671ffff7 101 deselect();
manumaet 0:f50e671ffff7 102 }
manumaet 0:f50e671ffff7 103
manumaet 8:7a9c61242e2f 104 void DW1000::writeRegister(uint8_t reg, uint16_t subaddress, uint8_t *buffer, int length) {
manumaet 0:f50e671ffff7 105 setupTransaction(reg, subaddress, true);
manumaet 8:7a9c61242e2f 106 for(int i=0; i<length; i++) // put data
manumaet 0:f50e671ffff7 107 spi.write(buffer[i]);
manumaet 0:f50e671ffff7 108 deselect();
manumaet 0:f50e671ffff7 109 }
manumaet 0:f50e671ffff7 110
manumaet 8:7a9c61242e2f 111 void DW1000::setupTransaction(uint8_t reg, uint16_t subaddress, bool write) {
manumaet 0:f50e671ffff7 112 reg |= (write * DW1000_WRITE_FLAG);
manumaet 0:f50e671ffff7 113 select();
manumaet 0:f50e671ffff7 114 if (subaddress > 0) { // there's a subadress, we need to set flag and send second header byte
manumaet 0:f50e671ffff7 115 spi.write(reg | DW1000_SUBADDRESS_FLAG);
manumaet 0:f50e671ffff7 116 if (subaddress > 127) { // sub address too long, we need to set flag and send third header byte
manumaet 0:f50e671ffff7 117 spi.write((uint8_t)(subaddress & 0x7F) | DW1000_2_SUBADDRESS_FLAG);
manumaet 0:f50e671ffff7 118 spi.write((uint8_t)(subaddress >> 7));
manumaet 0:f50e671ffff7 119 } else {
manumaet 0:f50e671ffff7 120 spi.write((uint8_t)subaddress);
manumaet 0:f50e671ffff7 121 }
manumaet 0:f50e671ffff7 122 } else {
manumaet 0:f50e671ffff7 123 spi.write(reg);
manumaet 0:f50e671ffff7 124 }
manumaet 0:f50e671ffff7 125 }
manumaet 0:f50e671ffff7 126
manumaet 0:f50e671ffff7 127 void DW1000::select() { cs = 0; } //Set CS low to start transmission
manumaet 0:f50e671ffff7 128 void DW1000::deselect() { cs = 1; } //Set CS high to stop transmission