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Diff: MMA8452.h
- Revision:
- 11:dfd1e0afcb7b
- Parent:
- 10:ca9ba7ad4e94
- Child:
- 12:172540ff6b8b
--- a/MMA8452.h Tue Mar 04 11:14:34 2014 +0000 +++ b/MMA8452.h Tue Mar 04 16:23:40 2014 +0000 @@ -20,6 +20,10 @@ // the SparkFun breakout board defaults to 1, set to 0 if SA0 jumper on the bottom of the board is set // see the Table 10. I2C Device Address Sequence in Freescale MMA8452Q pdf + +#define DBG(...) pc.printf(__VA_ARGS__); pc.printf("\r\n"); +#define DBGX(...) pc.print(__VA_ARGS__); + //#define SA0 1 //#if SA0 //#define MMA8452_ADDRESS 0x3A // SA0 is high, 0x1C if low - it should be 0x1D, but we shift now to save shifting in the code @@ -64,9 +68,9 @@ // More info on MCU Master address can be found on section 5.10.1 of http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MMA8452Q #define SA0 1 #if SA0 - #define MMA8452_ADDRESS 0x1D // SA0 is high, 0x1C if low - + #define MMA8452_ADDRESS 0x3A // 0x1D<<1 // SA0 is high, 0x1C if low - #else - #define MMA8452_ADDRESS 0x1C + #define MMA8452_ADDRESS 0x38 // 0x1C<<1 #endif // Register descriptions found in section 6 of pdf @@ -116,21 +120,53 @@ #define PDET_STATUS 0x09 // Tap/Pulse Detection Register (Read/Write) #define PD_STATUS 0xA // Tap/Pulse Debounce Count Register (Read/Write) +#define MMA8452_ACTIVE_MASK 0x01 +#define MMA8452_STANDBY_MASK 0xFE + +#define MMA8452_XYZ_DATA_CFG 0x0E +#define MMA8452_CTRL_REG_1 0x2A + +#define MMA8452_DYNAMIC_RANGE_MASK 0xFC + + +#define MMA8452_DATA_RATE_MASK 0xC7 +#define MMA8452_DATA_RATE_MASK_SHIFT 0x03 + +#define MMA8452_WRITE_MASK 0xFE +#define MMA8452_READ_MASK 0x01 + +#define MMA8452_BIT_DEPTH_MASK 0xFD +#define MMA8452_BIT_DEPTH_MASK_SHIFT 0x01 + class MMA8452 { public: - enum OperationalMode { - MODE_STANDBY, - MODE_ACTIVE_2G, - MODE_ACTIVE_4G, - MODE_ACTIVE_8G + enum DynamicRange { + DYNAMIC_RANGE_2G=0x00, + DYNAMIC_RANGE_4G, + DYNAMIC_RANGE_8G, + DYNAMIC_RANGE_UNKNOWN }; enum BitDepth { - BIT_DEPTH_8, - BIT_DEPTH_12 + BIT_DEPTH_12=0x00, + BIT_DEPTH_8 // 1 sets fast read mode, hence the inversion }; + + enum DataRateHz { + RATE_800=0x00, + RATE_400, + RATE_200, + RATE_100, + RATE_50, + RATE_12_5, + RATE_6_25, + RATE_1_563, + RATE_UNKNOWN + }; + + //void setDynamicRange( /** Create an accelerometer object connected to the specified I2C object * @@ -145,26 +181,8 @@ * */ ~MMA8452(); - - /** Get system mode of the MMA8452 (not required) - * returns 0 for success in reading the system mode of the chip - * returns 1 for failure in reading the system mode of the chip - * -currently no retries or waiting is done, this method tries 1 time then exits. - * - * This method is used to find out the system mode of the chip ACTIVE = 0x00 or STANDBY = 0x01 - */ - int getSystemMode(int *dst); - /** Get status of the MMA8452 (not required) - * returns 0 for success in reading the status of the chip - * returns 1 for failure in reading the status of the chip - * -currrently no retries or waiting is done, this method tries 1 time then exits. - * - * This method is used to find out the real time status of the device it shows if - * x,y and z values have been overwritten before they have been read since a change happened. - * - */ - int getStatus(int *dst); + //int setOperationMode(OperationMode m); /** Activate the MMA8452 (required) @@ -195,7 +213,7 @@ * This will return the state of the control register 1. This holds and sets values for auto wake, sleep mode * output data rate, fast read mode and active/standby. More info on 6.7 of pdf for MMA8452 Freescale doc. */ - int get_CTRL_Reg1(int* dst); + int get_CTRL_Reg1(char* dst); /** Initialization of device MMA8452 (required) @@ -208,7 +226,7 @@ * return 0 for success or * return 1 for failure. */ - int getDeviceID(int *dst); + int getDeviceID(char* dst); int read_y(); @@ -246,24 +264,36 @@ * @param addr The internal registeraddress of the MMA8452 * @returns The value of the register */ - int readRegister(char addr, int *dst); + int readRegister(char addr, char *dst); + + int readRegister(char addr, char *dst, int nbytes); /** Write to specified MMA8452 register * * @param addr The internal registeraddress of the MMA8452 * @param data New value of the register */ - void writeRegister(char addr, char data); + int writeRegister(char addr, char data); + int writeRegister(char addr, char *data, int nbytes); + + int logicalANDRegister(char addr, char mask); + int logicalORRegister(char addr, char mask); + int logicalXORRegister(char addr, char mask); - int setOperationalMode(OperationalMode m); - int setBitDepth(BitDepth b); + int setDynamicRange(DynamicRange range, int toggleActivation=1); + int setBitDepth(BitDepth depth, int toggleActivation=1); + int setDataRate(DataRateHz dataRate, int toggleActivation=1); + DynamicRange getDynamicRange(); + DataRateHz getDataRate(); + + void debugRegister(char reg); private: int readRaw(char src, char *dst, int len); - + int maskAndApplyRegister(char reg, char mask, char value, int toggleActivation); - I2C m_i2c; - int m_frequency; + I2C _i2c; + int _frequency; int _readAddress; int _writeAddress;