mma8452.h

00001 /*
00002  * Library for mma8452 3-Axis, 12-bit/8-bit, Digital Accelerometer
00003  * Made by Jurica Resetar
00004  * jurica_resetar@yahoo.com
00005  *
00006  * All rights reserved
00007  */
00008  
00009 #include "mbed.h"
00010  
00011 #define SA0 1
00012 #if SA0
00013     #define MMA8452_ADDRESS     (0x1D << 1)    // SA0 is high, 0x1C if low. Shifting address by 1 bit as i2c is a 7 bit encoding, and this is 8bit encoded
00014 #else
00015     #define MMA8452_ADDRESS     (0x1C << 1)    // SA0 is high, 0x1C if low. Shifting address by 1 bit as i2c is a 7 bit encoding, and this is 8bit encoded
00016 #endif
00017 
00018 #define STATUS 0x00                         // Type 'read' : Real time status, should return 0x00
00019 #define OUT_X_MSB 0x01                      // Type 'read' : x axis - 8 most significatn bit of a 12 bit sample
00020 #define OUT_X_LSB 0x02                      // Type 'read' : x axis - 4 least significatn bit of a 12 bit sample
00021 #define OUT_Y_MSB 0x03                      // Type 'read' : y axis - 8 most significatn bit of a 12 bit sample
00022 #define OUT_Y_LSB 0x04                      // Type 'read' : y axis - 4 least significatn bit of a 12 bit sample
00023 #define OUT_Z_MSB 0x05                      // Type 'read' : z axis - 8 most significatn bit of a 12 bit sample
00024 #define OUT_Z_LSB 0x06                      // Type 'read' : z axis - 4 least significatn bit of a 12 bit sample
00025 
00026 #define SYSMOD 0x0B                         // Type 'read' : This tells you if device is active, sleep or standy 0x00=STANDBY 0x01=WAKE 0x02=SLEEP
00027 #define WHO_AM_I 0x0D                       // Type 'read' : This should return the device id of 0x2A
00028 
00029 #define PL_STATUS 0x10                      // Type 'read' : This shows portrait landscape mode orientation
00030 #define PL_CFG 0x11                         // Type 'read/write' : This allows portrait landscape configuration
00031 #define PL_COUNT 0x12                       // Type 'read' : This is the portraint landscape debounce counter
00032 #define PL_BF_ZCOMP 0x13                    // Type 'read' :
00033 #define PL_THS_REG 0x14                     // Type 'read' :
00034 
00035 #define FF_MT_CFG 0X15                      // Type 'read/write' : Freefaul motion functional block configuration
00036 #define FF_MT_SRC 0X16                      // Type 'read' : Freefaul motion event source register
00037 #define FF_MT_THS 0X17                      // Type 'read' : Freefaul motion threshold register
00038 #define FF_COUNT  0X18                       // Type 'read' : Freefaul motion debouce counter
00039 
00040 #define ASLP_COUNT 0x29                     // Type 'read/write' : Counter settings for auto sleep
00041 #define CTRL_REG_1 0x2A                     // Type 'read/write' :
00042 #define CTRL_REG_2 0x2B                     // Type 'read/write' :
00043 #define CTRL_REG_3 0x2C                     // Type 'read/write' :
00044 #define CTRL_REG_4 0x2D                     // Type 'read/write' :
00045 #define CTRL_REG_5 0x2E                     // Type 'read/write' :
00046 
00047 // Defined in table 13 of the Freescale PDF
00048 #define STANDBY 0x00                        // State value returned after a SYSMOD request, it can be in state STANDBY, WAKE or SLEEP
00049 #define WAKE 0x01                           // State value returned after a SYSMOD request, it can be in state STANDBY, WAKE or SLEEP
00050 #define SLEEP 0x02                          // State value returned after a SYSMOD request, it can be in state STANDBY, WAKE or SLEEP
00051 #define ACTIVE 0x01                         // Stage value returned and set in Control Register 1, it can be STANDBY=00, or ACTIVE=01
00052 
00053 
00054  
00055 #define TILT_STATUS 0x03        // Tilt Status (Read only)
00056 #define SRST_STATUS 0x04        // Sample Rate Status Register (Read only)
00057 #define SPCNT_STATUS 0x05       // Sleep Count Register (Read/Write)
00058 #define INTSU_STATUS 0x06       // Interrupt Setup Register
00059 #define MODE_STATUS 0x07        // Mode Register (Read/Write)
00060 #define SR_STATUS 0x08          // Auto-Wake and Active Mode Portrait/Landscape Samples per Seconds Register (Read/Write)
00061 #define PDET_STATUS 0x09        // Tap/Pulse Detection Register (Read/Write)
00062 #define PD_STATUS 0xA           // Tap/Pulse Debounce Count Register (Read/Write)
00063 
00064 
00065 class Acc_MMA8452{
00066     public:
00067         Acc_MMA8452(PinName sda, PinName scl, char address);
00068         ~Acc_MMA8452();
00069         //uint8_tinit();
00070         uint8_t set_register(char reg, char data);
00071         uint8_t get_register(char reg, char *data);
00072         uint8_t get_x_acc(char *data);
00073         uint8_t get_y_acc(char *data);
00074         uint8_t get_z_acc(char *data);
00075         
00076         char acc_address;
00077         
00078     private:
00079     I2C i2c;
00080 };
00081