Added a GPIO to power on/off for external I2C sensor(s) (with LEDs)
Dependencies: UniGraphic mbed vt100
MMA8451Q.cpp
00001 /** 00002 * MMA8451Q 3-Axis, 14-bit/8-bit Digital Accelerometer 00003 */ 00004 00005 #include "mbed.h" 00006 #include "MMA8451Q.h" 00007 #include "af_mgr.h" 00008 00009 #define REG_STATUS 0x00 // when F_MODE = 00 00010 #define REG_FIFO_STATUS 0x00 // when F_MODE > 0 00011 #define REG_XYZ_FIFO 0x01 // Root pointer to XYZ FIFO data 00012 #define REG_OUT_X_MSB 0x01 // 8 MSBs of 14-bit sample 00013 #define REG_OUT_X_LSB 0x02 // 6 LSBs of 14-bit sample 00014 #define REG_OUT_Y_MSB 0x03 00015 #define REG_OUT_Y_LSB 0x04 00016 #define REG_OUT_Z_MSB 0x05 00017 #define REG_OUT_Z_LSB 0x06 00018 #define REG_F_SETUP 0x09 // FIFO setup 00019 #define REG_TRIG_CFG 0x0A // Map of FIFO daa capture events 00020 #define REG_SYSMOD 0x0B // Current System Mode 00021 #define REG_INT_SOURCE 0x0C // Interrupt status 00022 #define REG_WHO_AM_I 0x0D // Device ID (0x1A) 00023 #define REG_XYZ_DATA_CFG 0x0E // Dynamic Range Settings 00024 #define REG_HP_FILTER_CUTOFF 0x0F // Cutoff freq is set to 16Hz@800Hz 00025 #define REG_PL_STATUS 0x10 // Landscape/Portrait orientation status 00026 #define REG_PL_CFG 0x11 // Landscape/Portrait configuration 00027 #define REG_PL_COUNT 0x12 // Landscape/Portrait debounce counter 00028 #define REG_PL_BF_ZCOMP 0x13 // Back/Front, Z-Lock Trip threshold 00029 #define REG_P_L_THS_REG 0x14 // Portrait to Landscape Trip Angle is 29 degree 00030 #define REG_FF_MT_CFG 0x15 // Freefall/Motion function block configuration 00031 #define REG_FF_MT_SRC 0x16 // Freefall/Motion event source register 00032 #define REG_FF_MT_THS 0x17 // Freefall/Motion threshold register 00033 #define REG_FF_MT_COUNT 0x18 // Freefall/Motion debounce counter 00034 // TRANSIENT 00035 #define REG_TRANSIENT_CFG 0x1D // Transient functional block configuration 00036 #define REG_TRANSIENT_SRC 0x1E // Transient event status register 00037 #define REG_TRANSIENT_THS 0x1F // Transient event threshold 00038 #define REG_TRANSIENT_COUNT 0x20 // Transient debounce counter 00039 // PULSE 00040 #define REG_PULSE_CFG 0x21 // ELE, Double_XYZ or Single_XYZ 00041 #define REG_PULSE_SRC 0x22 // EA, Double_XYZ or Single_XYZ 00042 #define REG_PULSE_THSX 0x23 // X pulse threshold 00043 #define REG_PULSE_THSY 0x24 // Y pulse threshold 00044 #define REG_PULSE_THSZ 0x25 // Z pulse threshold 00045 #define REG_PULSE_TMLT 0x26 // Time limit for pulse 00046 #define REG_PULSE_LTCY 0x27 // Latency time for 2nd pulse 00047 #define REG_PULSE_WIND 0x28 // Window time for 2nd pulse 00048 #define REG_ASLP_COUNT 0x29 // Counter setting for Auto-SLEEP 00049 // Control Registers 00050 #define REG_CTRL_REG1 0x2A // ODR = 800Hz, STANDBY Mode 00051 #define REG_CTRL_REG2 0x2B // Sleep Enable, OS Modes, RST, ST 00052 #define REG_CTRL_REG3 0x2C // Wake from Sleep, IPOL, PP_OD 00053 #define REG_CTRL_REG4 0x2D // Interrupt enable register 00054 #define REG_CTRL_REG5 0x2E // Interrupt pin (INT1/INT2) map 00055 // User Offset 00056 #define REG_OFF_X 0x2F // X-axis offset adjust 00057 #define REG_OFF_Y 0x30 // Y-axis offset adjust 00058 #define REG_OFF_Z 0x31 // Z-axis offset adjust 00059 00060 // Value definitions 00061 #define BIT_TRIG_TRANS 0x20 // Transient interrupt trigger bit 00062 #define BIT_TRIG_LNDPRT 0x10 // Landscape/Portrati Orientation 00063 #define BIT_TRIG_PULSE 0x08 // Pulse interrupt trigger bit 00064 #define BIT_TRIG_FF_MT 0x04 // Freefall/Motion trigger bit 00065 00066 MMA8451Q::MMA8451Q(I2C *i2c, int addr) : m_addr(addr<<1) { 00067 // activate the peripheral 00068 p_i2c = i2c ; 00069 uint8_t data[2] = {REG_CTRL_REG1, 0x01}; 00070 writeRegs(data, 2); 00071 } 00072 00073 MMA8451Q::~MMA8451Q() { } 00074 00075 int MMA8451Q::readRegs(int addr, uint8_t * data, int len) 00076 { 00077 char t[1] = {addr}; 00078 int result ; 00079 __disable_irq() ; // Disable Interrupts 00080 result = p_i2c->write(m_addr, t, 1, true); 00081 if (result == 0) { 00082 result = p_i2c->read(m_addr, (char *)data, len); 00083 } 00084 __enable_irq() ; // Enable Interrupts 00085 return( result ) ; 00086 } 00087 00088 int MMA8451Q::writeRegs(uint8_t * data, int len) 00089 { 00090 int result ; 00091 __disable_irq() ; // Disable Interrupts 00092 result = p_i2c->write(m_addr, (char *)data, len); 00093 __enable_irq() ; // Enable Interrupts 00094 return( result ) ; 00095 } 00096 00097 int MMA8451Q::getAllRawData(int16_t value[]) 00098 { 00099 int result ; 00100 uint8_t data[6] ; 00101 result = readRegs(REG_OUT_X_MSB, data, 6) ; 00102 if (result == 0) { 00103 value[0] = ((int16_t)((data[0] << 8) | data[1])) >> 2 ; 00104 value[1] = ((int16_t)((data[2] << 8) | data[3])) >> 2 ; 00105 value[2] = ((int16_t)((data[4] << 8) | data[5])) >> 2 ; 00106 } 00107 return( result ) ; 00108 } 00109 00110 int MMA8451Q::getAllData(float fvalue[]) 00111 { 00112 int result ; 00113 uint8_t data[6] ; 00114 result = readRegs(REG_OUT_X_MSB, data, 6) ; 00115 if (result == 0) { 00116 fvalue[0] = (float)((int16_t)((data[0] << 8) | data[1])) / 16384.0 ; 00117 fvalue[1] = (float)((int16_t)((data[2] << 8) | data[3])) / 16384.0 ; 00118 fvalue[2] = (float)((int16_t)((data[4] << 8) | data[5])) / 16384.0 ; 00119 } 00120 return( result ) ; 00121 } 00122 00123 int16_t MMA8451Q::getRawData(uint8_t addr) 00124 { 00125 int16_t value ; 00126 uint8_t data[2] ; 00127 readRegs(addr, data, 2) ; 00128 value = ((int16_t)((data[0] << 8) | data[1])) >> 2 ; 00129 return( value ) ; 00130 } 00131 00132 int16_t MMA8451Q::getRawX(void) 00133 { 00134 int16_t value ; 00135 value = getRawData(REG_OUT_X_MSB) ; 00136 return( value ) ; 00137 } 00138 00139 int16_t MMA8451Q::getRawY(void) 00140 { 00141 int16_t value ; 00142 value = getRawData(REG_OUT_Y_MSB) ; 00143 return( value ) ; 00144 } 00145 00146 int16_t MMA8451Q::getRawZ(void) 00147 { 00148 int16_t value ; 00149 value = getRawData(REG_OUT_Z_MSB) ; 00150 return( value ) ; 00151 } 00152 00153 float MMA8451Q::getAccX(void) 00154 { 00155 return(((float)getRawX())/4096.0) ; 00156 } 00157 00158 float MMA8451Q::getAccY(void) 00159 { 00160 return(((float)getRawY())/4096.0) ; 00161 } 00162 00163 float MMA8451Q::getAccZ(void) 00164 { 00165 return(((float)getRawZ())/4096.0) ; 00166 }
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