Library for MMA7660FC Accelerometer device
Dependents: TestCode_MMA7660FC 3D_Accelerometer_Tester RTOS-aap-board-modules embed_Grove_3-Axis_Digital_Accelerometer ... more
MMA7660FC.cpp
- Committer:
- edodm85
- Date:
- 2012-07-04
- Revision:
- 4:6e931d9bbf4b
- Parent:
- 3:df25c72e16be
- Child:
- 5:d2f90c0be13f
File content as of revision 4:6e931d9bbf4b:
// Author: Edoardo De Marchi /* Copyright (C) 2012 mbed.org, MIT License * * 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. */ #include "MMA7660FC.h" #define OUT_X 0x00 // [6:0] are Read Only 6-bit output value X (XOUT[5] is 0 if the g direction is positive, 1 is negative) #define OUT_Y 0x01 // [6:0] are Read Only 6-bit output value Y (YOUT[5] is 0 if the g direction is positive, 1 is negative) #define OUT_Z 0x02 // [6:0] are Read Only 6-bit output value Z (ZOUT[5] is 0 if the g direction is positive, 1 is negative) #define TILT_STATUS 0x03 // Tilt Status (Read only) #define SRST_STATUS 0x04 // Sample Rate Status Register (Read only) #define SPCNT_STATUS 0x05 // Sleep Count Register (Read/Write) #define INTSU_STATUS 0x06 // Interrupt Setup Register #define MODE_STATUS 0x07 // Mode Register (Read/Write) #define SR_STATUS 0x08 // Auto-Wake and Active Mode Portrait/Landscape Samples per Seconds Register (Read/Write) #define PDET_STATUS 0x09 // Tap/Pulse Detection Register (Read/Write) #define PD_STATUS 0xA // Tap/Pulse Debounce Count Register (Read/Write) float TILT_XY[64] = {0, 2.69, 5.38, 8.08, 10.81, 13.55, 16.33, 19.16, 22.02, 24.95, 27.95, 31.04, 34.23, 37.54, 41.01, 44.68, 48.59, 52.83, 57.54, 62.95, 69.64, 79.86, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -79.86, -69.64, -62.95, -57.54, -52.83, -48.59, -44.68, -41.01, -37.54, -34.23, -31.04, -27.95, -24.95, -22.02, -19.16, -16.33, -13.55, -10.81, -8.08, -5.38, -2.69}; float TILT_Z[64] = {90.00, 87.31, 84.62, 81.92, 79.19, 76.45, 73.67, 70.84, 67.98, 65.05, 62.05, 58.96, 55.77, 52.46, 48.99, 45.32, 41.41, 37.17, 32.46, 27.05, 20.36, 10.14, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -10.14, -20.36, -27.05, -32.46, -37.17, -41.41, -45.32, -48.99, -52.46, -55.77, -58.96, -62.05, -65.05, -67.98, -70.84, -73.67, -76.45, -79.19, -81.92, -84.62}; // Connect module at I2C address addr using I2C port pins sda and scl MMA7660FC::MMA7660FC(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr) { } // Destroys instance MMA7660FC::~MMA7660FC() { } // Device initialization void MMA7660FC::init() { write_reg(INTSU_STATUS, 0x10); // automatic interrupt after every measurement write_reg(SR_STATUS, 0x00); // 120 Samples/Second write_reg(MODE_STATUS, 0x01); // Active Mode } // Reads the tilt angle void MMA7660FC::read_Tilt(float *x, float *y, float *z) { const char Addr_X = OUT_X; char buf[3] = {0,0,0}; m_i2c.write(m_addr, &Addr_X, 1); // Pointer to the OUT_X register m_i2c.read(m_addr, buf, 3); // Read register content into buffer with 6bit // returns the x, y, z coordinates transformed into full degrees *x = TILT_XY[buf[0]]; *y = TILT_XY[buf[1]]; *z = TILT_Z[buf[2]]; } // Reads x data float MMA7660FC::read_x() { m_i2c.start(); // Start m_i2c.write(0x98); // A write to device 0x98 m_i2c.write(OUT_X); // Register to read m_i2c.start(); m_i2c.write(0x99); // Read from device 0x99 char x = m_i2c.read(0); // Read the data m_i2c.stop(); return (float)x; } // Reads y data float MMA7660FC::read_y() { m_i2c.start(); // Start m_i2c.write(0x98); // A write to device 0x98 m_i2c.write(OUT_Y); // Register to read m_i2c.start(); m_i2c.write(0x99); // Read from device 0x99 char y = m_i2c.read(0); // Read the data m_i2c.stop(); return (float)y; } // Reads z data float MMA7660FC::read_z() { m_i2c.start(); // Start m_i2c.write(0x98); // A write to device 0x98 m_i2c.write(OUT_Z); // Register to read m_i2c.start(); m_i2c.write(0x99); // Read from device 0x99 char z = m_i2c.read(0); // Read the data m_i2c.stop(); return (float)z; } // Read from specified MMA7660FC register char MMA7660FC::read_reg(char addr) { m_i2c.start(); // Start m_i2c.write(0x98); // A write to device 0x98 m_i2c.write(addr); // Register to read m_i2c.start(); m_i2c.write(0x99); // Read from device 0x99 char c = m_i2c.read(0); // Read the data m_i2c.stop(); return c; } // Write register (The device must be placed in Standby Mode to change the value of the registers) void MMA7660FC::write_reg(char addr, char data) { char cmd[2] = {0, 0}; cmd[0] = MODE_STATUS; cmd[1] = 0x00; // Standby Mode on m_i2c.write(m_addr, cmd, 2); cmd[0] = addr; cmd[1] = data; // New value of the register m_i2c.write(m_addr, cmd, 2); cmd[0] = MODE_STATUS; cmd[1] = 0x01; // Active Mode on m_i2c.write(m_addr, cmd, 2); }