Interface for an LIS302 accelerometer, using the SPI interface
Dependents: LIS302_HelloWorld mbed_line_camera
LIS302.h
00001 /* mbed LIS302 Accelerometer Library 00002 * Copyright (c) 2008-2010, sford, cstyles, wreynolds 00003 * 00004 * Permission is hereby granted, free of charge, to any person obtaining a copy 00005 * of this software and associated documentation files (the "Software"), to deal 00006 * in the Software without restriction, including without limitation the rights 00007 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 00008 * copies of the Software, and to permit persons to whom the Software is 00009 * furnished to do so, subject to the following conditions: 00010 * 00011 * The above copyright notice and this permission notice shall be included in 00012 * all copies or substantial portions of the Software. 00013 * 00014 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 00015 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 00016 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 00017 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 00018 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 00019 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 00020 * THE SOFTWARE. 00021 */ 00022 00023 #ifndef MBED_LIS302_H 00024 #define MBED_LIS302_H 00025 00026 #include "mbed.h" 00027 00028 /** An interface for the LIS302 triple axis SPI accelerometer 00029 * 00030 * @code 00031 * // Print out the Z axis acceleration 00032 * #include "mbed.h" 00033 * #include "LIS302.h" 00034 * 00035 * LIS302 acc(p5, p6, p7, p8); // mosi, miso, clk, ncs 00036 * 00037 * int main() { 00038 * while(1) { 00039 * printf("Z axis acceleration = %.2f\n", acc.z()); 00040 * wait(0.1); 00041 * } 00042 * } 00043 * @endcode 00044 */ 00045 class LIS302 { 00046 public: 00047 00048 /** Create an LIS302 interface, connected to the specified pins 00049 * 00050 * @param mosi SPI data out 00051 * @param miso SPI data in 00052 * @param clk SPI clock 00053 * @param ncs Active low chip select (DigitalOut) 00054 */ 00055 LIS302(PinName mosi, PinName miso, PinName clk, PinName ncs); 00056 00057 /** Read the X axis acceleration 00058 * 00059 * @return A floating-point value representing acceleration in g 00060 */ 00061 float x(); 00062 00063 /** Read the Y axis acceleration 00064 * 00065 * @return A floating-point value representing acceleration in g 00066 */ 00067 float y(); 00068 00069 /** Read the Z axis acceleration 00070 * 00071 * @return - A floating-point value representing acceleration in g 00072 */ 00073 float z(); 00074 00075 /** Select the range of the accelerometer 00076 * 00077 * @param range 0 = 2g, 1 = 8g 00078 */ 00079 void range(int g); 00080 00081 /** Configure the minima and maxima for the axes to linearise the readings 00082 * 00083 * @param maxx float defining the maximum X value 00084 * @param minx float defining the minimum X value 00085 * @param maxy float defining the maximum Y value 00086 * @param miny float defining the minimum Y value 00087 * @param maxz float defining the maximum Z value 00088 * @param minz float defining the minimum Z value 00089 */ 00090 void calibrate(float maxx = 1, float minx = -1, float maxy = 1, float miny = -1, float maxz = 1, float minz = -1); 00091 00092 private: 00093 SPI _spi; 00094 DigitalOut _ncs; 00095 00096 int whoami(); 00097 int status(); 00098 00099 float _factor; 00100 float _maxx, _minx; 00101 float _maxy, _miny; 00102 float _maxz, _minz; 00103 }; 00104 00105 #endif
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