Diff: ADXL345_I2C.cpp

Revision:

0:3957077e9775

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ADXL345_I2C.cpp	Wed Feb 02 06:38:11 2011 +0000
@@ -0,0 +1,427 @@
+/**
+ * @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;
+
+}