how to get lsm303c INT_XL interrupt be "active low"

[GFone]

Hi,

I am trying to get lsm303c output an "active low" interrupt on pin INT_XL.

here is my init code:

void LSM303C_AccInit(void)

{  

  uint8_t result = 0;

  

  ACCELERO_IO_Write(LSM303C_CTRL_REG1_A, 0b00100101);  // disable y axis to avoid mg 

  

  ACCELERO_IO_Write(LSM303C_CTRL_REG2_A, 0b00000000);  

  

  ACCELERO_IO_Write(LSM303C_CTRL_REG3_A, 0b00001000);  

  

  ACCELERO_IO_Write(LSM303C_CTRL_REG4_A, 0b00000000);

  

  

  ACCELERO_IO_Write(LSM303C_CTRL_REG5_A, 0b00000011);  //interrupt active low, open-drain

  

  ACCELERO_IO_Write(LSM303C_FIFO_CTRL, 0b01000000);  //stream mode,

  

  ACCELERO_IO_Write(LSM303C_IG_CFG1_A, 0b11100010);  //y interrupt disabled

  

  ACCELERO_IO_Write(LSM303C_IG_THS_X1_A, 5);

  ACCELERO_IO_Write(LSM303C_IG_THS_Y1_A, 5);

  ACCELERO_IO_Write(LSM303C_IG_THS_Z1_A, 5);

  

  ACCELERO_IO_Write(LSM303C_IG_DUR1_A, 0b10000001); //interrupt delay

}

The embedded controller's pin is configured as input with weak pull up.

The oscilloscope shows a good interrupt reaction to acceleration, but not as i configured it: the INT_XL is low when no interrupt, but as soon as there is acceleration detected, the signal goes high for about 40ms and then goes back to low again forever.

What am i doing wrong?

Thanks,

Gil

[Miroslav BATEK]

Following configuration is not correct:

ACCELERO_IO_Write(LSM303C_IG_CFG1_A, 0b11100010);  //y interrupt disabled

Please set the AOI bit to 1 if you want AND combination or to 0 if you want OR and set the

6D bit to 0.