File content as of revision 0:a973ef498a1d:
/**
* @author Jose R. Padron
*
* @section LICENSE
*
* Copyright (c) 2010 ARM Limited
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* @section DESCRIPTION
*
* ADXL345, triple axis, digital interface, accelerometer.
*
* Datasheet:
*
* http://www.analog.com/static/imported-files/data_sheets/ADXL345.pdf
*/
/**
* Includes
*/
#include "ADXL345_I2C.h"
ADXL345_I2C::ADXL345_I2C(PinName sda,
PinName scl) : i2c_(sda,scl) {
//100KHz, as specified by the datasheet.
i2c_.frequency(100000);
wait_us(500);
}
char ADXL345_I2C::getDevId(void) {
return oneByteRead(ADXL345_DEVID_REG);
}
int ADXL345_I2C::getTapThreshold(void) {
return oneByteRead(ADXL345_THRESH_TAP_REG);
}
void ADXL345_I2C::setTapThreshold(int threshold) {
oneByteWrite(ADXL345_THRESH_TAP_REG, threshold);
}
int ADXL345_I2C::getOffset(int axis) {
int address = 0;
if (axis == ADXL345_X) {
address = ADXL345_OFSX_REG;
} else if (axis == ADXL345_Y) {
address = ADXL345_OFSY_REG;
} else if (axis == ADXL345_Z) {
address = ADXL345_OFSZ_REG;
}
return oneByteRead(address);
}
void ADXL345_I2C::setOffset(int axis, char offset) {
char address = 0;
if (axis == ADXL345_X) {
address = ADXL345_OFSX_REG;
} else if (axis == ADXL345_Y) {
address = ADXL345_OFSY_REG;
} else if (axis == ADXL345_Z) {
address = ADXL345_OFSZ_REG;
}
return oneByteWrite(address, offset);
}
int ADXL345_I2C::getTapDuration(void) {
return oneByteRead(ADXL345_DUR_REG)*625;
}
void ADXL345_I2C::setTapDuration(int duration_us) {
int tapDuration = duration_us / 625;
oneByteWrite(ADXL345_DUR_REG, tapDuration);
}
float ADXL345_I2C::getTapLatency(void) {
return oneByteRead(ADXL345_LATENT_REG)*1.25;
}
void ADXL345_I2C::setTapLatency(int latency_ms) {
int tapLatency = latency_ms / 1.25;
oneByteWrite(ADXL345_LATENT_REG, tapLatency);
}
float ADXL345_I2C::getWindowTime(void) {
return oneByteRead(ADXL345_WINDOW_REG)*1.25;
}
void ADXL345_I2C::setWindowTime(int window_ms) {
int windowTime = window_ms / 1.25;
oneByteWrite(ADXL345_WINDOW_REG, windowTime);
}
int ADXL345_I2C::getActivityThreshold(void) {
return oneByteRead(ADXL345_THRESH_ACT_REG);
}
void ADXL345_I2C::setActivityThreshold(int threshold) {
oneByteWrite(ADXL345_THRESH_ACT_REG, threshold);
}
int ADXL345_I2C::getInactivityThreshold(void) {
return oneByteRead(ADXL345_THRESH_INACT_REG);
}
void ADXL345_I2C::setInactivityThreshold(int threshold) {
return oneByteWrite(ADXL345_THRESH_INACT_REG, threshold);
}
int ADXL345_I2C::getTimeInactivity(void) {
return oneByteRead(ADXL345_TIME_INACT_REG);
}
void ADXL345_I2C::setTimeInactivity(int timeInactivity) {
oneByteWrite(ADXL345_TIME_INACT_REG, timeInactivity);
}
int ADXL345_I2C::getActivityInactivityControl(void) {
return oneByteRead(ADXL345_ACT_INACT_CTL_REG);
}
void ADXL345_I2C::setActivityInactivityControl(int settings) {
oneByteWrite(ADXL345_ACT_INACT_CTL_REG, settings);
}
int ADXL345_I2C::getFreefallThreshold(void) {
return oneByteRead(ADXL345_THRESH_FF_REG);
}
void ADXL345_I2C::setFreefallThreshold(int threshold) {
oneByteWrite(ADXL345_THRESH_FF_REG, threshold);
}
int ADXL345_I2C::getFreefallTime(void) {
return oneByteRead(ADXL345_TIME_FF_REG)*5;
}
void ADXL345_I2C::setFreefallTime(int freefallTime_ms) {
int freefallTime = freefallTime_ms / 5;
oneByteWrite(ADXL345_TIME_FF_REG, freefallTime);
}
int ADXL345_I2C::getTapAxisControl(void) {
return oneByteRead(ADXL345_TAP_AXES_REG);
}
void ADXL345_I2C::setTapAxisControl(int settings) {
oneByteWrite(ADXL345_TAP_AXES_REG, settings);
}
int ADXL345_I2C::getTapSource(void) {
return oneByteRead(ADXL345_ACT_TAP_STATUS_REG);
}
void ADXL345_I2C::setPowerMode(char mode) {
//Get the current register contents, so we don't clobber the rate value.
char registerContents = oneByteRead(ADXL345_BW_RATE_REG);
registerContents = (mode << 4) | registerContents;
oneByteWrite(ADXL345_BW_RATE_REG, registerContents);
}
int ADXL345_I2C::getPowerControl(void) {
return oneByteRead(ADXL345_POWER_CTL_REG);
}
void ADXL345_I2C::setPowerControl(int settings) {
oneByteWrite(ADXL345_POWER_CTL_REG, settings);
}
int ADXL345_I2C::getInterruptEnableControl(void) {
return oneByteRead(ADXL345_INT_ENABLE_REG);
}
void ADXL345_I2C::setInterruptEnableControl(int settings) {
oneByteWrite(ADXL345_INT_ENABLE_REG, settings);
}
int ADXL345_I2C::getInterruptMappingControl(void) {
return oneByteRead(ADXL345_INT_MAP_REG);
}
void ADXL345_I2C::setInterruptMappingControl(int settings) {
oneByteWrite(ADXL345_INT_MAP_REG, settings);
}
int ADXL345_I2C::getInterruptSource(void){
return oneByteRead(ADXL345_INT_SOURCE_REG);
}
int ADXL345_I2C::getDataFormatControl(void){
return oneByteRead(ADXL345_DATA_FORMAT_REG);
}
void ADXL345_I2C::setDataFormatControl(int settings){
oneByteWrite(ADXL345_DATA_FORMAT_REG, settings);
}
void ADXL345_I2C::setDataRate(int rate) {
//Get the current register contents, so we don't clobber the power bit.
char registerContents = oneByteRead(ADXL345_BW_RATE_REG);
registerContents &= 0x10;
registerContents |= rate;
oneByteWrite(ADXL345_BW_RATE_REG, registerContents);
}
int ADXL345_I2C::getAx(){
char buffer[2];
TwoByteRead(ADXL345_DATAX0_REG, buffer);
return ((int)buffer[1] << 8 | (int)buffer[0]);
}
int ADXL345_I2C::getAy(){
char buffer[2];
TwoByteRead(ADXL345_DATAY0_REG, buffer);
return ((int)buffer[1] << 8 | (int)buffer[0]);
}
int ADXL345_I2C::getAz(){
char buffer[2];
TwoByteRead(ADXL345_DATAZ0_REG, buffer);
return ((int)buffer[1] << 8 | (int)buffer[0]);
}
void ADXL345_I2C::getOutput(int* readings){
char buffer[2];
TwoByteRead(ADXL345_DATAX0_REG, buffer);
readings[0] = (int)buffer[1] << 8 | (int)buffer[0];
TwoByteRead(ADXL345_DATAY0_REG, buffer);
readings[1] = (int)buffer[1] << 8 | (int)buffer[0];
TwoByteRead(ADXL345_DATAZ0_REG, buffer);
readings[2] = (int)buffer[1] << 8 | (int)buffer[0];
}
int ADXL345_I2C::getFifoControl(void){
return oneByteRead(ADXL345_FIFO_CTL);
}
void ADXL345_I2C::setFifoControl(int settings){
oneByteWrite(ADXL345_FIFO_STATUS, settings);
}
int ADXL345_I2C::getFifoStatus(void){
return oneByteRead(ADXL345_FIFO_STATUS);
}
char ADXL345_I2C::oneByteRead(char address) {
char rx[1];
char tx[1];
// nCS_ = 1;
tx[0]=address;
i2c_.write(ADXL345_I2C_WRITE, tx,1);
i2c_.read(ADXL345_I2C_READ,rx,1);
//nCS_ = 0;
return rx[0];
}
void ADXL345_I2C::oneByteWrite(char address, char data) {
// nCS_ = 1;
char tx[2];
tx[0]=address;
tx[1]=data;
i2c_.write(ADXL345_I2C_WRITE,tx,2);
//nCS_ = 0;
}
void ADXL345_I2C::TwoByteRead(char startAddress, char* buffer) {
// nCS_ = 1;
//Send address to start reading from.
char tx[1];
tx[0]=startAddress;
i2c_.write(ADXL345_I2C_WRITE,tx,1);
i2c_.read(ADXL345_I2C_READ,buffer,2);
//nCS_ = 0;
}
void ADXL345_I2C::TwoByteWrite(char startAddress, char* buffer) {
//nCS_ = 1;
//Send address to start reading from.
char tx[1];
tx[0]=startAddress;
i2c_.write(ADXL345_I2C_WRITE,tx,1);
i2c_.write(ADXL345_I2C_WRITE,buffer,2);
//nCS_ = 0;
}