Reading LIS2DE12 temperature always reads 0

[WSpar.1]

Hi all,

I'm currently not able to read the temperature of my lis2de12.
It always returns zero.

 

lis2de12_temperature_meas_set(&dev_ctx, LIS2DE12_TEMP_ENABLE);

lis2de12_data_rate_set(&dev_ctx, LIS2DE12_ODR_400Hz );

lis2de12_block_data_update_set(&dev_ctx, PROPERTY_ENABLE);

 

What could be the issue here?
I'm only reading temp, not X Y Z values yet.

 

UPDATE:

After playing around reading OUT_TEMP_L (0Ch), OUT_TEMP_H (0Dh) separately, my code now reads twice 0x80.

I think my platform functions are not incrementing the register address?

static int32_t platform_read(void *handle, uint8_t reg, uint8_t *bufp, uint16_t len)

{

HAL_I2C_Mem_Read(handle, LIS2DE12_I2C_ADD_H, reg, 1, (uint8_t*)bufp, len, 1000);

 

return 0;

}

 

Otherwise I would assume seeing 0x0D in the scope image.

 

 

[Federica Bossi]

Hi @WSpar.1 ,

Please, look at our drivers on github where you can find how to implement the reading of the temperature.

Let me know if this helps.

[WSpar.1]

I'm using that driver, it works fine for reading single register, not if you need incremental register address 0x0C to 0x0D

The working depends on what is inside platform_read()

For now I fixed it with, but not ideal:

static int32_t platform_read(void *handle, uint8_t reg, uint8_t *bufp, uint16_t len)

{

 

if(len == 2)

{

HAL_I2C_Mem_Read(handle, LIS2DE12_I2C_ADD_H, reg, 1, (uint8_t*)bufp, 1, 1500);

reg++;

bufp++;

 

HAL_I2C_Mem_Read(handle, LIS2DE12_I2C_ADD_H, reg, 1, (uint8_t*)bufp, 1, 1500);

} else {

 

HAL_I2C_Mem_Read(handle, LIS2DE12_I2C_ADD_H, reg, 1, (uint8_t*)bufp, len, 1500);

}

 

return 0;

}

 

Would be nice if HAL_I2C_Mem_Read() had an register increment option

 

 

[Federica Bossi]

Hi @WSpar.1 ,

You can look here how to implement the read/write multiple.

You will find this comment:  /* Read multiple command */ and how to implement it in I2C communication.

Hope this helps.