Hi,
I have developed attached code for I2C communication with STS30 temperature sensor. The main function STS30_I2C_sample() checks whether STS30 sensor is detected by STS30_detect() and then performs a temperature measurement. The code is initially written by placing STS30_I2C_sample() inside the main function with a delay of 1second like below:
int main(void)
{
// initialization and configuration .......
while (true)
{
STS30_I2C_sample();
nrf_delay_ms(1000);
}
}
This works fine. Every 1 second STS30_detect() and other I2C functions are called and they invoke twi_handler during I2C communication.
For power saving purposes, I have added the code for an RTC low frequency low power timer counter and its handler into my original code and moved STS30_I2C_sample() function into my timer handler function rtc_handler(). During debugging I can see rtc_handler() is called after 1 second, then it calls STS30_I2C_sample() function inside it, and this calls for STS30_detect() function. This is where the problem happens. Now I dont see twi_handler being called anymore, and my code get stuck in line while(m_xfer_done == false) of function STS30_detect().
When I compare signals in the two cases by logic analyzer, I dont see any difference in signals being sent/received to/from STS30 sensor by nrf_drv_twi_rx() function inside STS30_detect(). So I think maybe there is issue calling twi_handler from inside rtc_handler.
Please see my code below. I appreciate if you can tell me what the issue could be.
Thanks
