Library for MMA7660FC Accelerometer device
Dependents: TestCode_MMA7660FC 3D_Accelerometer_Tester RTOS-aap-board-modules embed_Grove_3-Axis_Digital_Accelerometer ... more
Diff: MMA7660FC.cpp
- Revision:
- 0:eb135a8de811
- Child:
- 3:df25c72e16be
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/MMA7660FC.cpp Sat Jun 30 10:08:19 2012 +0000 @@ -0,0 +1,114 @@ +// 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) + + + + // 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 X, Y, Z data +void MMA7660FC::read_g(int *x, int *y, int *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 + + *x = buf[0]; + *y = buf[1]; + *z = buf[2]; + +} + + + // 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(); // Need to send start condition here + m_i2c.write(0x99); // Read from device 0x99 + char c = m_i2c.read(0); // Read the data + m_i2c.stop(); // 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); + +}