mirror of
https://github.com/RobTillaart/Arduino.git
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312 lines
6.4 KiB
C++
312 lines
6.4 KiB
C++
//
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// FILE: hmc6352.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.03
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// PURPOSE: HMC6352 library for Arduino
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//
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// HISTORY:
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// 0.1.00 - 2011-04-07 initial version
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// 0.1.01 - 2011-04-09 quite a complete redo
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// 0.1.02 - 2011-04-12 added timing, fixed a bug
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// 0.1.03 - 2011-04-13 fixed small things; added getHeading()
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// 0.1.4 - 2017-09-13 minor refactor
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//
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// Released to the public domain
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//
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#include <hmc6352.h>
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#include <Wire.h>
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#if defined(ARDUINO) && ARDUINO >= 100
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#define WIRE_WRITE Wire.write
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#define WIRE_READ Wire.read
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#else
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#define WIRE_WRITE Wire.send
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#define WIRE_READ Wire.receive
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#endif
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/* ERROR CODES ALL FUNCTIONS
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//
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// * twi_writeTo codes (== endTransmission commands)
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// 0 .. OK
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// -1 .. length to long for buffer
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// -2 .. address send, NACK received
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// -3 .. data send, NACK received
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// -4 .. other twi error (lost bus arbitration, bus error, ..)
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//
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// * requestFrom
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// -10 .. not enough values returned
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//
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// * function calls
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// 0 .. OK
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// -20 .. error param1
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// -21 .. error param2
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// -22 .. error param3
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//
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*/
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hmc6352::hmc6352(uint8_t device)
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{
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Wire.begin();
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_device = constrain(device, 0x10, 0xF6);
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}
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int hmc6352::getHeading()
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{
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int rv = askHeading();
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if (rv != 0) return rv;
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return readHeading();
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}
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// Ask the device to make a new reading
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int hmc6352::askHeading()
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{
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int rv = cmd(HMC_GET_DATA);
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if (rv != 0) return -rv; // problem with handshake
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delay(6); // see datasheet, p8
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return rv;
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}
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// read the last value from the
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int hmc6352::readHeading()
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{
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int rv = Wire.requestFrom(_device, (uint8_t)2); // remove ambiguity
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if (rv != 2) return -10;
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rv = WIRE_READ() * 256; // MSB
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rv += WIRE_READ(); // LSB
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return rv;
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}
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// wake up from energy saving modus
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int hmc6352::wakeUp()
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{
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int rv = cmd(HMC_WAKE);
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delayMicroseconds(100);
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return rv;
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}
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// go into energy saving modus
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int hmc6352::sleep()
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{
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int rv = cmd(HMC_SLEEP);
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delayMicroseconds(10);
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return rv;
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}
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// values obtained from dump
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int hmc6352::factoryReset()
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{
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writeRAM(0x74, 0x50); // is needed !!
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writeCmd(HMC_WRITE_EEPROM, 0, 66);
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writeCmd(HMC_WRITE_EEPROM, 1, 0);
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writeCmd(HMC_WRITE_EEPROM, 2, 0);
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writeCmd(HMC_WRITE_EEPROM, 3, 0);
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writeCmd(HMC_WRITE_EEPROM, 4, 0);
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writeCmd(HMC_WRITE_EEPROM, 5, 1);
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writeCmd(HMC_WRITE_EEPROM, 6, 4);
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writeCmd(HMC_WRITE_EEPROM, 7, 6);
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writeCmd(HMC_WRITE_EEPROM, 8, 0x50);
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cmd(HMC_SAVE_OP_MODE);
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delayMicroseconds(125);
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return 0;
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}
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// HANDLE WITH CARE - RESTART NECESSARY
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// Returns Operational Mode Config Byte
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int hmc6352::setOperationalModus(hmcMode m, uint8_t freq, bool periodicReset)
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{
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byte omcb = 0; // Operational Mode Control Byte
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switch(freq)
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{
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case 1: break;
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case 5: omcb |= 0x20; break;
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case 10: omcb |= 0x40; break;
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case 20: omcb |= 0x60; break;
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default: return -21;
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}
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if (periodicReset) omcb |= 0x10;
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switch(m)
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{
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case STANDBY: break; // omcb |= 0x00;
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case QUERY: omcb |= 0x01; break;
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case CONT: omcb |= 0x02; break;
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default: return -20;
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}
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writeCmd(HMC_WRITE_RAM, 0x74, omcb);
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cmd(HMC_SAVE_OP_MODE);
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delayMicroseconds(125);
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return omcb;
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}
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// read the Operational Modus as byte from EEPROM
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// TODO: split into 3 items
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//
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int hmc6352::getOperationalModus()
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{
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// datasheet state that at startup the OM is copied from EEPROM
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// and that after writing to RAM a reboot is needed to enable new settings
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// my interpretation ==> EEPROM is leading
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return readCmd(HMC_READ_RAM, 0x74);
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//return readCmd(HMC_READ_EEPROM, 0x08);
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}
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// Switch between normal heading and raw modes
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// default = 0 ==> normal headings
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// Note: after a reboot the output modus will be 0 again.
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int hmc6352::setOutputModus(uint8_t om)
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{
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if (om > 4) return -20;
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return writeCmd(HMC_WRITE_RAM, 0x4E, om);
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}
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// Read the output modus from RAM
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int hmc6352::getOutputModus()
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{
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return readCmd(HMC_READ_RAM, 0x4E);
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}
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// NOT TESTED
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int hmc6352::callibrationOn()
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{
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int rv = cmd(HMC_CALLIBRATE_ON);
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delayMicroseconds(10);
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return rv;
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}
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// NOT TESTED
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int hmc6352::callibrationOff()
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{
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int rv = cmd(HMC_CALLIBRATE_OFF);
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delay(15);
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return rv;
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}
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// NOT TESTED
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int hmc6352::setI2CAddress(uint8_t address)
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{
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if (address < 0x10 || address > 0xF6 ) return -20;
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return writeCmd(HMC_WRITE_EEPROM, 0, address);
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}
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// returns current I2C address
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int hmc6352::getI2CAddress()
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{
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return readCmd(HMC_READ_EEPROM, 0);
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}
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// NOT TESTED
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// meaning time delay unknown
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// therefore removed from lib for now
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int hmc6352::setTimeDelay(uint8_t msec)
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{
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return writeCmd(HMC_WRITE_EEPROM, 5, msec);
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}
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int hmc6352::getTimeDelay()
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{
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return readCmd(HMC_READ_EEPROM, 5);
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}
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// NOT TESTED
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// meaning measurement summing unknown
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// therefore removed from lib for now
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int hmc6352::setMeasurementSumming(uint8_t ms)
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{
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if (ms > 16 ) ms = 16;
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return writeCmd(HMC_WRITE_EEPROM, 6, ms);
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}
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int hmc6352::getMeasurementSumming()
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{
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return readCmd(HMC_READ_EEPROM, 6);
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}
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// Makes only sense in setOperationalModus()
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// therefore removed from lib for now
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int hmc6352::saveOpMode()
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{
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int rv = cmd(HMC_SAVE_OP_MODE);
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delayMicroseconds(125);
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return rv;
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}
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// NOT TESTED
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// meaning UpdateOffsets unknown
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// therefore removed from lib for now
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int hmc6352::updateOffsets()
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{
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int rv = cmd(HMC_UPDATE_OFFSETS);
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delay(6);
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return rv;
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}
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// idem
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// use at own risk ...
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int hmc6352::writeEEPROM(uint8_t address, uint8_t data)
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{
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return writeCmd(HMC_WRITE_EEPROM, address, data);
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}
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// idem
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int hmc6352::readEEPROM(uint8_t address)
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{
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return readCmd(HMC_READ_EEPROM, address);
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}
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// idem
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// Most RAM locations have an unknown meaning
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// use at own risk ...
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int hmc6352::writeRAM(uint8_t address, uint8_t data)
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{
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return writeCmd(HMC_WRITE_RAM, address, data);
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}
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// idem
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int hmc6352::readRAM(uint8_t address)
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{
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return readCmd(HMC_READ_RAM, address);
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}
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/* PRIVATE FUNCTIONS
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mostly to remove redundancy in functions above
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*/
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int hmc6352::cmd(uint8_t c)
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{
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Wire.beginTransmission(_device);
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WIRE_WRITE(c);
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int rv = Wire.endTransmission();
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delay(10);
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return rv;
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}
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int hmc6352::readCmd(uint8_t c, uint8_t address)
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{
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Wire.beginTransmission(_device);
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WIRE_WRITE(c);
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WIRE_WRITE(address);
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int rv = Wire.endTransmission();
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if (rv != 0) return -rv;
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delayMicroseconds(70);
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rv = Wire.requestFrom(_device, (uint8_t)1);
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if (rv != 1) return -10;
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rv = WIRE_READ();
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return rv;
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}
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int hmc6352::writeCmd(uint8_t c, uint8_t address, uint8_t data)
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{
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Wire.beginTransmission(_device);
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WIRE_WRITE(c);
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WIRE_WRITE(address);
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WIRE_WRITE(data);
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int rv = Wire.endTransmission();
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delayMicroseconds(70);
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return rv;
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}
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