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Adafruit_LIS3DH.cpp
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Adafruit_LIS3DH.cpp
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/*!
* @file Adafruit_LIS3DH.cpp
*
* @mainpage Adafruit LIS3DH breakout board
*
* @section intro_sec Introduction
*
* This is a library for the Adafruit LIS3DH Accel breakout board
*
* Designed specifically to work with the Adafruit LIS3DH Accel breakout board.
*
* Pick one up today in the adafruit shop!
* ------> https://www.adafruit.com/product/2809
*
* This sensor communicates over I2C or SPI (our library code supports both) so
* you can share it with a bunch of other sensors on the same I2C bus.
*
* Adafruit invests time and resources providing this open source code,
* please support Adafruit andopen-source hardware by purchasing products
* from Adafruit!
*
* @section author Author
*
* K. Townsend / Limor Fried (Adafruit Industries)
*
* @section license License
*
* BSD license, all text above must be included in any redistribution
*/
#include "Arduino.h"
#include <Adafruit_LIS3DH.h>
#include <Wire.h>
/*!
* @brief Instantiates a new LIS3DH class in I2C
* @param Wi
* optional wire object
*/
Adafruit_LIS3DH::Adafruit_LIS3DH(TwoWire *Wi)
: _cs(-1), _mosi(-1), _miso(-1), _sck(-1), _sensorID(-1) {
I2Cinterface = Wi;
}
/*!
* @brief Instantiates a new LIS3DH class using hardware SPI
* @param cspin
* number of CSPIN (Chip Select)
* @param *theSPI
* optional parameter contains spi object
* @param frequency
* frequency of the SPI interface
*/
Adafruit_LIS3DH::Adafruit_LIS3DH(int8_t cspin, SPIClass *theSPI,
uint32_t frequency) {
_cs = cspin;
_mosi = -1;
_miso = -1;
_sck = -1;
_sensorID = -1;
SPIinterface = theSPI;
_frequency = frequency;
}
/*!
* @brief Instantiates a new LIS3DH class using software SPI
* @param cspin
* number of CSPIN (Chip Select)
* @param mosipin
* number of pin used for MOSI (Master Out Slave In))
* @param misopin
* number of pin used for MISO (Master In Slave Out)
* @param sckpin
* number of pin used for CLK (clock pin)
* @param frequency
* frequency of the SPI interface
*/
Adafruit_LIS3DH::Adafruit_LIS3DH(int8_t cspin, int8_t mosipin, int8_t misopin,
int8_t sckpin, uint32_t frequency) {
_cs = cspin;
_mosi = mosipin;
_miso = misopin;
_sck = sckpin;
_sensorID = -1;
_frequency = frequency;
}
/*!
* @brief Setups the HW (reads coefficients values, etc.)
* @param i2caddr
* i2c address (optional, fallback to default)
* @param nWAI
* Who Am I register value - defaults to 0x33 (LIS3DH)
* @return true if successful
*/
bool Adafruit_LIS3DH::begin(uint8_t i2caddr, uint8_t nWAI) {
_i2caddr = i2caddr;
_wai = nWAI;
if (I2Cinterface) {
i2c_dev = new Adafruit_I2CDevice(_i2caddr, I2Cinterface);
if (!i2c_dev->begin()) {
return false;
}
} else if (_cs != -1) {
// SPIinterface->beginTransaction(SPISettings(500000, MSBFIRST, SPI_MODE0));
if (_sck == -1) {
spi_dev = new Adafruit_SPIDevice(_cs,
_frequency, // frequency
SPI_BITORDER_MSBFIRST, // bit order
SPI_MODE0, // data mode
SPIinterface);
} else {
spi_dev = new Adafruit_SPIDevice(_cs, _sck, _miso, _mosi,
_frequency, // frequency
SPI_BITORDER_MSBFIRST, // bit order
SPI_MODE0); // data mode
}
if (!spi_dev->begin()) {
return false;
}
}
/* Check connection */
if (getDeviceID() != _wai) {
/* No LIS3DH detected ... return false */
// Serial.println(deviceid, HEX);
return false;
}
Adafruit_BusIO_Register _ctrl1 = Adafruit_BusIO_Register(
i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, LIS3DH_REG_CTRL1, 1);
_ctrl1.write(0x07); // enable all axes, normal mode
// 400Hz rate
setDataRate(LIS3DH_DATARATE_400_HZ);
Adafruit_BusIO_Register _ctrl4 = Adafruit_BusIO_Register(
i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, LIS3DH_REG_CTRL4, 1);
_ctrl4.write(0x88); // High res & BDU enabled
enableDRDY(true, 1);
// Turn on orientation config
Adafruit_BusIO_Register _tmp_cfg = Adafruit_BusIO_Register(
i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, LIS3DH_REG_TEMPCFG, 1);
_tmp_cfg.write(0x80); // enable adcs
return true;
}
/*!
* @brief Get Device ID from LIS3DH_REG_WHOAMI
* @return WHO AM I value
*/
uint8_t Adafruit_LIS3DH::getDeviceID(void) {
Adafruit_BusIO_Register _chip_id = Adafruit_BusIO_Register(
i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, LIS3DH_REG_WHOAMI, 1);
return _chip_id.read();
}
/*!
* @brief Check to see if new data available
* @return true if there is new data available, false otherwise
*/
bool Adafruit_LIS3DH::haveNewData(void) {
Adafruit_BusIO_Register status_2 = Adafruit_BusIO_Register(
i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, LIS3DH_REG_STATUS2, 1);
Adafruit_BusIO_RegisterBits zyx_data_available =
Adafruit_BusIO_RegisterBits(&status_2, 1, 3);
return zyx_data_available.read();
}
/*!
* @brief Reads x y z values at once
*/
void Adafruit_LIS3DH::read(void) {
uint8_t register_address = LIS3DH_REG_OUT_X_L;
if (i2c_dev) {
register_address |= 0x80; // set [7] for auto-increment
} else {
register_address |= 0x40; // set [6] for auto-increment
register_address |= 0x80; // set [7] for read
}
Adafruit_BusIO_Register xl_data = Adafruit_BusIO_Register(
i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, register_address, 6);
uint8_t buffer[6];
xl_data.read(buffer, 6);
x = buffer[0];
x |= ((uint16_t)buffer[1]) << 8;
y = buffer[2];
y |= ((uint16_t)buffer[3]) << 8;
z = buffer[4];
z |= ((uint16_t)buffer[5]) << 8;
uint8_t range = getRange();
uint8_t mode = getPerformanceMode();
// this scaling process accounts for the shift due to actually being 10 bits
// (normal mode) as well as the lsb=> mg conversion and the mg=> g conversion
// final value is raw_lsb => 10-bit lsb -> milli-gs -> gs
// depending on the range, we'll always convert the value to 8/10/12 bits and
// g's so we'll divide by LIS3DH_LSB16_TO_KILO_LSB10 (16000), _LSB8 or _LSB12:
// then we can then multiply the resulting value by the lsb value to get the
// value in g's
uint8_t lsb_value = 1;
if (range == LIS3DH_RANGE_2_G)
lsb_value = 4;
if (range == LIS3DH_RANGE_4_G)
lsb_value = 8;
if (range == LIS3DH_RANGE_8_G)
lsb_value = 16;
if (range == LIS3DH_RANGE_16_G)
lsb_value = 48;
float convert_from_LSB16 = 64000.0;
if (mode == LIS3DH_MODE_HIGH_RESOLUTION) {
lsb_value = lsb_value / 4; // 1 at 2G, 2 at 4G, 4 at 8G, 12 at 16G
convert_from_LSB16 = LIS3DH_LSB16_TO_KILO_LSB12;
} else if (mode == LIS3DH_MODE_NORMAL) {
convert_from_LSB16 = LIS3DH_LSB16_TO_KILO_LSB10;
} else if (mode == LIS3DH_MODE_LOW_POWER) {
lsb_value = lsb_value * 4; // 16 at 2G, 32 at 4G, 64 at 8G, 192 at 16G
convert_from_LSB16 = LIS3DH_LSB16_TO_KILO_LSB8;
}
x_g = lsb_value * ((float)x / convert_from_LSB16);
y_g = lsb_value * ((float)y / convert_from_LSB16);
z_g = lsb_value * ((float)z / convert_from_LSB16);
}
/*!
* @brief Read the auxilary ADC
* @param adc
* adc index. possible values (1, 2, 3).
* @return auxilary ADC value
*/
int16_t Adafruit_LIS3DH::readADC(uint8_t adc) {
if ((adc < 1) || (adc > 3))
return 0;
adc--; // switch to 0 indexed
uint16_t value;
uint8_t reg = LIS3DH_REG_OUTADC1_L + (adc * 2);
if (i2c_dev) {
reg |= 0x80; // set [7] for auto-increment
} else {
reg |= 0x40; // set [6] for auto-increment
reg |= 0x80; // set [7] for read
}
uint8_t buffer[2];
Adafruit_BusIO_Register adc_data =
Adafruit_BusIO_Register(i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, reg, 2);
adc_data.read(buffer, 2);
value = buffer[0];
value |= ((uint16_t)buffer[1]) << 8;
return value;
}
/*!
* @brief Set INT to output for single or double click
* @param c
* 0 = turn off I1_CLICK
* 1 = turn on all axes & singletap
* 2 = turn on all axes & doubletap
* @param clickthresh
* CLICK threshold value
* @param timelimit
* sets time limit (default 10)
* @param timelatency
* sets time latency (default 20)
* @param timewindow
* sets time window (default 255)
*/
void Adafruit_LIS3DH::setClick(uint8_t c, uint8_t clickthresh,
uint8_t timelimit, uint8_t timelatency,
uint8_t timewindow) {
Adafruit_BusIO_Register ctrl3 = Adafruit_BusIO_Register(
i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, LIS3DH_REG_CTRL3, 1);
Adafruit_BusIO_RegisterBits i1_click =
Adafruit_BusIO_RegisterBits(&ctrl3, 1, 7);
Adafruit_BusIO_Register click_cfg = Adafruit_BusIO_Register(
i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, LIS3DH_REG_CLICKCFG, 1);
if (!c) {
// disable int
i1_click.write(0); // disable i1 click
click_cfg.write(0);
return;
}
// else...
i1_click.write(1); // enable i1 click
Adafruit_BusIO_Register ctrl5 = Adafruit_BusIO_Register(
i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, LIS3DH_REG_CTRL5, 1);
Adafruit_BusIO_RegisterBits int1_latch_bit =
Adafruit_BusIO_RegisterBits(&ctrl5, 1, 3);
int1_latch_bit.write(true);
if (c == 1)
click_cfg.write(0x15); // turn on all axes & singletap
if (c == 2)
click_cfg.write(0x2A); // turn on all axes & doubletap
Adafruit_BusIO_Register click_ths = Adafruit_BusIO_Register(
i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, LIS3DH_REG_CLICKTHS, 1);
click_ths.write(clickthresh); // arbitrary
Adafruit_BusIO_Register time_limit = Adafruit_BusIO_Register(
i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, LIS3DH_REG_TIMELIMIT, 1);
time_limit.write(timelimit); // arbitrary
Adafruit_BusIO_Register time_latency = Adafruit_BusIO_Register(
i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, LIS3DH_REG_TIMELATENCY, 1);
time_latency.write(timelatency); // arbitrary
Adafruit_BusIO_Register time_window = Adafruit_BusIO_Register(
i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, LIS3DH_REG_TIMEWINDOW, 1);
time_window.write(timewindow); // arbitrary
}
/*!
* @brief Get uint8_t for single or double click
* @return register LIS3DH_REG_CLICKSRC
*/
uint8_t Adafruit_LIS3DH::getClick(void) {
Adafruit_BusIO_Register click_reg = Adafruit_BusIO_Register(
i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, LIS3DH_REG_CLICKSRC, 1);
return click_reg.read();
}
/*!
* @brief Get uint8_t for INT1 source and clear interrupt
* @return register LIS3DH_REG_INT1SRC
*/
uint8_t Adafruit_LIS3DH::readAndClearInterrupt(void) {
Adafruit_BusIO_Register int_reg = Adafruit_BusIO_Register(
i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, LIS3DH_REG_INT1SRC, 1);
return int_reg.read();
}
/**
* @brief Enable or disable the Data Ready interupt
*
* @param enable_drdy true to enable the given Data Ready interrupt on INT1,
* false to disable it
* @param int_pin which DRDY interrupt to enable; 1 for DRDY1, 2 for DRDY2
* @return true: success false: failure
*/
bool Adafruit_LIS3DH::enableDRDY(bool enable_drdy, uint8_t int_pin) {
Adafruit_BusIO_Register _ctrl3 = Adafruit_BusIO_Register(
i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, LIS3DH_REG_CTRL3, 1);
Adafruit_BusIO_RegisterBits _drdy1_int_enable =
Adafruit_BusIO_RegisterBits(&_ctrl3, 1, 4);
Adafruit_BusIO_RegisterBits _drdy2_int_enable =
Adafruit_BusIO_RegisterBits(&_ctrl3, 1, 3);
if (int_pin == 1) {
return _drdy1_int_enable.write(enable_drdy);
} else if (int_pin == 2) {
return _drdy2_int_enable.write(enable_drdy);
} else {
return false;
}
}
/*!
* @brief Sets the performance mode for the LIS3DH.
*
* The turn-on time to transition to 12-bit mode (high resolution) is set at
* 7ms, or swtch to 10-bit mode (normal) or to 8-bit mode (low power) is 1ms
*
* @param mode
* mode - low power, normal, high resolution e.g. LIS3DH_MODE_LOW_POWER
*/
void Adafruit_LIS3DH::setPerformanceMode(lis3dh_mode_t mode) {
// low power bit is in CTRL1, 4th bit from right
Adafruit_BusIO_Register _ctrl1 = Adafruit_BusIO_Register(
i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, LIS3DH_REG_CTRL1, 1);
Adafruit_BusIO_RegisterBits ctrl1_mode_bits =
Adafruit_BusIO_RegisterBits(&_ctrl1, 1, 3);
// high res bit is in CTRL4, 4th bit from right
Adafruit_BusIO_Register _ctrl4 = Adafruit_BusIO_Register(
i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, LIS3DH_REG_CTRL4, 1);
Adafruit_BusIO_RegisterBits ctrl4_mode_bits =
Adafruit_BusIO_RegisterBits(&_ctrl4, 1, 3);
switch (mode) {
case LIS3DH_MODE_LOW_POWER:
// set HR bit low (CTRL4) and LP bit high (CTRL1)
ctrl4_mode_bits.write(0);
ctrl1_mode_bits.write(1);
delay(1); // turn-on transition time (worst case)
break;
case LIS3DH_MODE_NORMAL:
// set HR bit low (CTRL4) and LP bit low (CTRL1)
ctrl1_mode_bits.write(0);
ctrl4_mode_bits.write(0);
delay(1); // turn-on transition time (worst case)
break;
case LIS3DH_MODE_HIGH_RESOLUTION:
// set HR bit high (CTRL4) and LP bit low (CTRL1)
ctrl1_mode_bits.write(0);
ctrl4_mode_bits.write(1);
delay(7); // turn-on transition time (worst case)
break;
}
}
/*!
* @brief Gets the performance mode for the LIS3DH
* @return Returns performance mode value
*/
lis3dh_mode_t Adafruit_LIS3DH::getPerformanceMode(void) {
// low power bit is in CTRL1, 4th bit from right
Adafruit_BusIO_Register _ctrl1 = Adafruit_BusIO_Register(
i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, LIS3DH_REG_CTRL1, 1);
Adafruit_BusIO_RegisterBits ctrl1_mode_bits =
Adafruit_BusIO_RegisterBits(&_ctrl1, 1, 3);
// high res bit is in CTRL4, 4th bit from right
Adafruit_BusIO_Register _ctrl4 = Adafruit_BusIO_Register(
i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, LIS3DH_REG_CTRL4, 1);
Adafruit_BusIO_RegisterBits ctrl4_mode_bits =
Adafruit_BusIO_RegisterBits(&_ctrl4, 1, 3);
bool lp = ctrl1_mode_bits.read() == 1;
bool hr = ctrl4_mode_bits.read() == 1;
if (!lp && !hr) {
return LIS3DH_MODE_NORMAL;
} else if (lp && !hr) {
return LIS3DH_MODE_LOW_POWER;
}
return LIS3DH_MODE_HIGH_RESOLUTION;
}
/*!
* @brief Sets the g range for the accelerometer
* @param range
* range value
*/
void Adafruit_LIS3DH::setRange(lis3dh_range_t range) {
Adafruit_BusIO_Register _ctrl4 = Adafruit_BusIO_Register(
i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, LIS3DH_REG_CTRL4, 1);
Adafruit_BusIO_RegisterBits range_bits =
Adafruit_BusIO_RegisterBits(&_ctrl4, 2, 4);
range_bits.write(range);
delay(15); // delay to let new setting settle
}
/*!
* @brief Gets the g range for the accelerometer
* @return Returns g range value
*/
lis3dh_range_t Adafruit_LIS3DH::getRange(void) {
Adafruit_BusIO_Register _ctrl4 = Adafruit_BusIO_Register(
i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, LIS3DH_REG_CTRL4, 1);
Adafruit_BusIO_RegisterBits range_bits =
Adafruit_BusIO_RegisterBits(&_ctrl4, 2, 4);
return (lis3dh_range_t)range_bits.read();
}
/*!
* @brief Sets the data rate for the LIS3DH (controls power consumption)
* @param dataRate
* data rate value
*/
void Adafruit_LIS3DH::setDataRate(lis3dh_dataRate_t dataRate) {
Adafruit_BusIO_Register _ctrl1 = Adafruit_BusIO_Register(
i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, LIS3DH_REG_CTRL1, 1);
Adafruit_BusIO_RegisterBits data_rate_bits =
Adafruit_BusIO_RegisterBits(&_ctrl1, 4, 4);
data_rate_bits.write(dataRate);
}
/*!
* @brief Gets the data rate for the LIS3DH (controls power consumption)
* @return Returns Data Rate value
*/
lis3dh_dataRate_t Adafruit_LIS3DH::getDataRate(void) {
Adafruit_BusIO_Register _ctrl1 = Adafruit_BusIO_Register(
i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, LIS3DH_REG_CTRL1, 1);
Adafruit_BusIO_RegisterBits data_rate_bits =
Adafruit_BusIO_RegisterBits(&_ctrl1, 4, 4);
return (lis3dh_dataRate_t)data_rate_bits.read();
}
/*!
* @brief Gets the most recent sensor event
* @param *event
* sensor event that we want to read
* @return true if successful
*/
bool Adafruit_LIS3DH::getEvent(sensors_event_t *event) {
/* Clear the event */
memset(event, 0, sizeof(sensors_event_t));
event->version = sizeof(sensors_event_t);
event->sensor_id = _sensorID;
event->type = SENSOR_TYPE_ACCELEROMETER;
event->timestamp = 0;
read();
event->acceleration.x = x_g * SENSORS_GRAVITY_STANDARD;
event->acceleration.y = y_g * SENSORS_GRAVITY_STANDARD;
event->acceleration.z = z_g * SENSORS_GRAVITY_STANDARD;
return true;
}
/*!
* @brief Gets the sensor_t data
* @param *sensor
* sensor that we want to write data into
*/
void Adafruit_LIS3DH::getSensor(sensor_t *sensor) {
/* Clear the sensor_t object */
memset(sensor, 0, sizeof(sensor_t));
/* Insert the sensor name in the fixed length char array */
strncpy(sensor->name, "LIS3DH", sizeof(sensor->name) - 1);
sensor->name[sizeof(sensor->name) - 1] = 0;
sensor->version = 1;
sensor->sensor_id = _sensorID;
sensor->type = SENSOR_TYPE_ACCELEROMETER;
sensor->min_delay = 0;
sensor->max_value = 0;
sensor->min_value = 0;
sensor->resolution = 0;
}