A chaotic value returned from sd_temp_get() after bluetooth's connection?why would this happen?

[Jerryxu]

Hi,

I want to read the temperature data from the sensor on-chip and send it to my phone by bluetooth. But as said above, after the connection between my nrf52832 module and my phone, the sd_temp_get() returned some very strange value, 

and before connection , it worked well. 

the LOG sequence was like this picture below:

if anyone have some advice?thanks

[Einar Thorsrud]

Hi,

I have not been able to reproduce this. Can you share the code you use to get and print the temperature? Please share enough to give the full context. Also, which SDK version and SoftDevice version do you use?

[Jerryxu]

I use SDK15.0, S132 softdevice v6.0

here the temp_read function i defined

and i use the temp_read () in timeout handler, here are the code about the timer below

（ "nrf_gpio_pin_toggle(11)", i just use it to led a led twinkling when disconnection happened）

this is my main function below:

[Einar Thorsrud]

Hi,

You are declaring temp as a uninitialized pointer. So you have no control over where it points, and it is a typical issue that will lead to memory corruption. The correct would be to declare it as a normal variable, and refer to the address using &. So your temp_read() function should look something like this:

int32_t temp_read()
{
    uint32_t err_code;
    int32_t temp;

    err_code = sd_temp_get(&temp);

    NRF_LOG_INFO("the temp is: %d", temp);

    return temp;
}