Initialization examples of several modes of mma8452q

During this period of time, debug a mma8452Q sensor , Several modes are simply tested , Comments may have inaccurate data , The general flow and registers of each mode operation are no problem , Don't spray ,

Various thresholds , It needs to be changed according to the actual situation .

1、 Sports mode
void MMA8452Q_Init_motion(void) 
{
kal_uint8 dev_id;
int i=0;
       float temp;
       MMA8452Q_Delay(2);                    // Power on delay
    //TODO    initialization iic
//MMA8452_Standby();
Single_Write_MMA8452(0x2A,0x10);// Set the device to 100hz odr 
   MMA8452Q_Delay(10); 
Single_Write_MMA8452(0x15,0xf8);// Configure the register by setting “ or ” Conditions OAE =1 Yes XY Direction motion detection and latch
   MMA8452Q_Delay(10); 
Single_Write_MMA8452(0x17,0x11);// Set the motion detection threshold >3G notes ： They count 0.063/ Count    3g/0.063 = 47.6 ~ 48  1.2/0.063 =20
   MMA8452Q_Delay(10); 
Single_Write_MMA8452(0x18,0x0a);// Set the bucket removal counter 100HZ Sampling rate , timer 100 millisecond To eliminate false degrees
   MMA8452Q_Delay(10); 
Single_Write_MMA8452(0x2d,0x04);// Enable movement in the system / Free fall interrupt function （CTRL_REG4）
   MMA8452Q_Delay(10); 
Single_Write_MMA8452(0x2e,0x04);// Will exercise / The free fall interrupt function is configured to INT1 Hardware pin of the （CTRL_REG5）
Single_Write_MMA8452(CTRL_REG1, 0x01);// Set to 800hz
MMA845x_Active();

   MMA8452Q_Delay(10); 

}

2、 Free fall mode

void MMA8452Q_Init_freefall(void) //mma8452q::mma8452q(uint8_t addr) {
{
kal_uint8 dev_id;
int i=0;
       float temp;
       MMA8452Q_Delay(2);                   // Power on delay
//TODO initialization iic

Single_Write_MMA8452(0x2A,0x20);// Set the device to 50hz odr  0x20 , 0x1A =100hz  ,0x12= 200hz
   MMA8452Q_Delay(10); 

Single_Write_MMA8452(0x15,0xB8);// Configure the register by setting “ or ” Conditions OAE =0 Yes XY Direction motion detection and latch
   MMA8452Q_Delay(10); 
Single_Write_MMA8452(0x17,0x06);// Set the acceleration generated by the motion detection threshold <0.2g notes ： They count 0.063/ Count    0.2g/0.063 = 3.17  1.2/0.063 =20
   MMA8452Q_Delay(10); 
Single_Write_MMA8452(0x18,0x10);// Set the bucket removal counter 50HZ Sampling rate , timer 120 millisecond To eliminate false degrees 10
   MMA8452Q_Delay(10); 
Single_Write_MMA8452(0x2d,0x04);// Enable movement in the system / Free fall interrupt function （CTRL_REG4）
   MMA8452Q_Delay(10); 
//Single_Write_MMA8452(0x2e,0x04);// Will exercise / The free fall interrupt function is configured to INT1 Hardware pin of the （CTRL_REG5）
MMA845x_Active();
   MMA8452Q_Delay(10); 

}

The interrupt registers read by work and free fall are 0x16

3、 Initialize monopulse mode

void MMA8452Q_Init_one_tap()

{

    kal_uint8 dev_id;

    int i=0;
   float temp;
   MMA8452Q_Delay(2);                    // Power on delay

//TODO initialization iic

//1、 The chip enters standby mode Set to 400hz
Single_Write_MMA8452(0x2A,0x08);// Set the device to 50hz odr  20 di 1A 100hz  0x12 200hz  0x08 400hz
   MMA8452Q_Delay(10); 
//2、 Set up run xyz Axis single point interrupt
Single_Write_MMA8452(0x21,0x15);// Set up xyz Direction interruption
MMA8452Q_Delay(10); 
//3、 Set single point of interruption The threshold of
Single_Write_MMA8452(0x23,0x19);// Every step is 0.0063g/count   1.575g/0.063 = 25counts   2.65g/0.063g=42counts  
MMA8452Q_Delay(10); 
Single_Write_MMA8452(0x24,0x19);//1.575g
MMA8452Q_Delay(10); 
Single_Write_MMA8452(0x25,0x2A);//2.65g
MMA8452Q_Delay(10); 
//4、 Set the trigger time of single point interrupt 50ms  Normal mode is not low filtering
//50ms/0.063 = 80counts
Single_Write_MMA8452(0x26,0x50);//50ms
MMA8452Q_Delay(10); 
//5、 Set delay time
// The data frequency is 400hz Every step is 1.25ms
//300ms/1.25ms = 240conut
Single_Write_MMA8452(0x27,0xF0);//50ms
MMA8452Q_Delay(10); 
//6、 Set the system interrupt to int1 
Single_Write_MMA8452(0x2D,0x08);// Set the interrupt area system   CTRL_REG4
MMA8452Q_Delay(10); 
Single_Write_MMA8452(0x2E,0x08);// Specify the hardware interrupt pin to INT1 CTRL_REG5
MMA8452Q_Delay(10); 
//7、 Activate the chip
MY_Multiple_Read_MMA8452(0x2A,0);// The read value is paid BUF[0]  
MMA8452Q_Delay(10); 
Single_Write_MMA8452(0x2A,BUF[0]|0x01);// Specify the hardware interrupt pin to INT1 CTRL_REG5

MMA8452Q_Delay(10); 

}

4、 Initialize dual pulse mode

void MMA8452Q_Init_two_tap()
{


kal_uint8 dev_id;
int i=0;
   float temp;
   MMA8452Q_Delay(2);                   // Power on delay
//TODO initialization iic
//1、 The chip enters standby mode Set to 400hz
Single_Write_MMA8452(0x2A,0x08);// Set the device to 50hz odr  20 di 1A 100hz  0x12 200hz  0x08 400hz
   MMA8452Q_Delay(10); 
//2、 Set up run xyz Axis single point interrupt Double click interrupt DPA =0 
Single_Write_MMA8452(0x21,0x2A);// Set up xyz Direction interruption
MMA8452Q_Delay(10); 
//3、 Set the interruption of each axis The threshold of   Every step is 0.0063g
Single_Write_MMA8452(0x23,0x19);// Every step is 0.0063g/count   1.575g/0.063 = 25counts   2.65g/0.063g=42counts  
MMA8452Q_Delay(10); 
Single_Write_MMA8452(0x24,0x19);//1.575g
MMA8452Q_Delay(10); 
Single_Write_MMA8452(0x25,0x2A);//2.65g
MMA8452Q_Delay(10); 
//4、 Set the trigger time of single point interrupt 60ms   400HZ ODR Step yes 1.25ms Every step （count）
//60ms/1.25 = 48counts
Single_Write_MMA8452(0x26,0x30);//60ms
MMA8452Q_Delay(10); 
//5、 Set delay time 200ms Low filter mode 400hz ODP LPMODE Step yes 2.5ms
// The data frequency is 400hz Every step is 2.5ms
//200ms/2.5ms = 80conut
Single_Write_MMA8452(0x27,0x50);//200ms
MMA8452Q_Delay(10); 
//6、 Set the second pulse interval     Low filter mode 400hz ODP LPMODE Step yes 2.5ms
//300ms/2.5ms = 120counts
Single_Write_MMA8452(0x28,0x78);//300ms
MMA8452Q_Delay(10); 
//7、 Set the system interrupt to int1 
Single_Write_MMA8452(0x2D,0x08);// Set the interrupt area system   CTRL_REG4
MMA8452Q_Delay(10); 
Single_Write_MMA8452(0x2E,0x08);// Specify the hardware interrupt pin to INT1 CTRL_REG5
MMA8452Q_Delay(10); 
//8、 Activate the chip
MY_Multiple_Read_MMA8452(0x2A,0);// The read value is paid BUF[0]  
MMA8452Q_Delay(10); 
Single_Write_MMA8452(0x2A,BUF[0]|0x01);// Specify the hardware interrupt pin to INT1 CTRL_REG5
MMA8452Q_Delay(10); 

}

The interrupt register corresponding to the pulse is

Every time an interrupt is generated, the priority is to read 0x0C register , Find out what caused the interruption