Posted on September 03, 2017 at 10:27Hello sir,
HELLO EVERYBODY,
I have a question about LIS3MDL. Expecially, interrupt problem.
I am using LIS3MDL below sequence.
=================================================================================
1. In normal circumstance, I get a basic data for reference threshold of Interrupt.
Normally, 0.4 ~0.5 gauss. And plus 0.1 gause for offset value.
2. I put in the data for Threshold value. And I enable the interrupt.
3. Wait the interrupt (basic data[0.4 ~0.5 gauss] + offset[0.1 gauss])
4. If interrupt is happened, the interrupt signal wake main CPU(stm32f103rct6)
problem
I checked how many times interrupt is happened, in normal circumstance(0.4 ~0.5gauss)
In our office, interrupt is not happened. ( It is good because our office does not have the change of geomagnetic)
Outside, interrupt is happend eventhough there are nothing to change geomagnetic.
==>I wonder why the interrupt is happened outside?
I hope you give me the solution.
================================================================================
The function,
void LIS3MDL_Init(void)
{
LIS3MDL_REGISTER_write_SET(LIS3MDL_ADDRESS1,CTRL_REG1,LIS3MDL_REG1_ULTRA_HIGH_XY | LIS3MDL_REG1_DR_80_HZ); // ODR
LIS3MDL_REGISTER_write_SET(LIS3MDL_ADDRESS1,CTRL_REG2,LIS3MDL_SCALE_4_GAUSS); // scale
LIS3MDL_REGISTER_write_SET(LIS3MDL_ADDRESS1,CTRL_REG3,LIS3MDL_REG3_CONTINUOUS);
LIS3MDL_REGISTER_write_SET(LIS3MDL_ADDRESS1,CTRL_REG4,LIS3MDL_REG4_ULTRA_HIGH_Z); // z-mode
LIS3MDL_REGISTER_write_SET(LIS3MDL_ADDRESS1,CTRL_REG5,LIS3MDL_REG5_BDU);
}
void LIS3MDL_Reinit(uint16_t reference_data)
{
uint8_t low_dataz=0, high_dataz =0;
low_dataz = reference_data & 0x00ff;
high_dataz = (reference_data>>8) & 0x00ff;
LIS3MDL_REGISTER_write_SET(LIS3MDL_ADDRESS1,INT_THS_L,low_dataz);
LIS3MDL_REGISTER_write_SET(LIS3MDL_ADDRESS1,INT_THS_H,high_dataz);
LIS3MDL_REGISTER_write_SET(LIS3MDL_ADDRESS1,INT_CFG,(LIS3MDL_INT_CFG_YIEN|LIS3MDL_INT_CFG_ZIEN|LIS3MDL_INT_CFG_IEA|LIS3MDL_INT_CFG_IEN));
}
================================================================================
The Code Sequence,
uint16_t Geo_reference_offset = 250;
LIS3MDL_Init();
for(int i =0;i<Geo_Average;i++)
{
do{
geo_status = LIS3MDL_STATUS_READ();
geo_status = geo_status & geo_shift;
}while(!geo_status);
Geo_Ref[i] = Check_Geomagnetic_Value(OUT_Z_L,OUT_Z_H);
if(Geo_Ref[i]>=32767)
{
if(i==0)Geo_max_value = Geo_Ref[i];
else
{
if(Geo_Ref[i]<Geo_max_value)Geo_max_value = Geo_Ref[i];
}
}
else
{
if(Geo_Ref[i]>Geo_max_value)Geo_max_value = Geo_Ref[i];
}
HAL_Delay(10);
}
Geo_data = Geo_max_value;
if(Geo_data>=Geo_Positive_MAX)geo_reference = (65535 - Geo_data)+Geo_reference_offset;
else geo_reference = Geo_data + Geo_reference_offset;
LIS3MDL_Reinit(geo_reference);
while(1)
{
// wait interrupt of LIS3MDL
}
===============================================================================
I've been tryied this problem to solve it however, I can not solve it.
Please, help me.
