Hello, I debug why MMA8452Q motion when the output is not interrupted? INT1 no change

[jackrong]

Hello, I debug why MMA8452Q motion when the output is not interrupted? INT1 no change

Initialization. System 2.8V power supply

void Init_MMA8452()       //initialization 
{
        Single_Write_MMA8452(0x2A,0x18);  //100HZ  ODR
     Single_Write_MMA8452(0x15,0xD8);  // The motion detection threshold set, X, Y axis
     Single_Write_MMA8452(0x17,0X30);  //Set the threshold for the 48 motion detection
     Single_Write_MMA8452(0x18,0x0A);  // 100 milliseconds to shake the time
        Single_Write_MMA8452(0x2D,0x04);   // Set motion interrupt
        Single_Write_MMA8452(0x2E,0x04);   //Set the interrupt pin for INT1 motion

        Single_Write_MMA8452(0x2A,0x19);   // Active mode
 
}

[TomasVaverka]

Hi Jack,

It is hard to say where the problem might be without seeing your complete source code/schematic.

I would recommend looking at the attached simple example code for motion detection based on the AN4070 and another thread where a similar problem was discussed.

I hope it helps.

Regards,

Tomas

PS: If my answer helps to solve your question, please mark it as "Correct". Thank you.

[jackrong]

The problem is solved. thank you!

[jackrong]

hello！Shaking, respectively, read X, Y, Z axis data have changed but the fracture INT1 no level change

void exint0() interrupt 0 //INT1 Interrupt entry (INT1 external 10K pull up resistor)

{

Single_Read_MMA8452(0X0C);

SeriPushSend('O');

SeriPushSend('K');

SeriPushSend('?');

}

void Init_MMA8452() //initialization

{

Single_Write_MMA8452(0x2A,0x18); //100HZ ODR

Single_Write_MMA8452(0x15,0xD8); // The motion detection threshold set, X, Y axis

Single_Write_MMA8452(0x17,0X30); //Set the threshold for the 48 motion detection

Single_Write_MMA8452(0x18,0x0A); // 100 milliseconds to shake the time

Single_Write_MMA8452(0x2C,0x01); //Low drop along trigger

Single_Write_MMA8452(0x2D,0x04); // Set motion interrupt

Single_Write_MMA8452(0x2E,0x04); //Set the interrupt pin for INT1 motion

Single_Write_MMA8452(0x2A,0x19); // Active mode

}

void main()

{

delay(250);

init_serialcom();

inti_time0();

Init_MMA8452();

count=0;

while(1)

{

if(count==100) //Read three axis data per second

{

count=0;

Multiple_Read_MMA8452();

display_x();

display_y();

display_z();

}

}

}

[jackrong]

hello！ Shaking, respectively, read X, Y, Z axis data have changed but the fracture INT1 no level change

   
   void  exint0() interrupt 0        //INT1 Interrupt entry   (INT1 external 10K pull up resistor)
    {
     Single_Read_MMA8452(0X0C);
     Single_Read_MMA8452(0X16);
  }

void Init_MMA8452()       //initialization 
{
        Single_Write_MMA8452(0x2A,0x18);  //100HZ  ODR
     Single_Write_MMA8452(0x15,0xD8);  // The motion detection threshold set, X, Y axis
     Single_Write_MMA8452(0x17,0X30);  //Set the threshold for the 48 motion detection
     Single_Write_MMA8452(0x18,0x0A);  // 100 milliseconds to shake the time

    Single_Write_MMA8452(0x2C,0x01);  //Low drop along trigger
        Single_Write_MMA8452(0x2D,0x04);   // Set motion interrupt
        Single_Write_MMA8452(0x2E,0x04);   //Set the interrupt pin for INT1 motion

        Single_Write_MMA8452(0x2A,0x19);   // Active mode
 
}