STS30 temperature sensor I2C code

Question

I am trying to read temperature value from STS30 temperature sensor using this simple code snippet: 
 
 During debugging, my debugger stuck at line "if (STS30_read_temp(temperature)==true)". When I step into this line, I can see debugger is stuck at line "return result" of function "nrf_drv_twi_tx" in nrf_drv_twi.h file. 
 Can you check the code and advise what am I doing wrong here. 
 I have attached the command sequence for reading temperature from STS30 sensor. 
 
 Thanks

user106191 · Accepted Answer

I could not find any timing constraint that cause this. Since it works fine in the first while loop and not the second one, I guess I am putting the sensor in a bad state in the second transition. So I disable/enable the sensor power supply everytime before I initiate STS30_detect() and execute a measurement. And that resolved the issue.

user65515 · Answer

I thought the address of this sensor was 0b0011xxxr where xxx is the state of the external pins A2/A1/A0. Try this (assuming all 3 address pins are tied low): 
 uint8_t STS30_Address = 0x18; // address of the sensor

user87869 · Answer

Hello again, Kaveh.m Thank you for your patience with this. 
 Kaveh.M said: I have already been able to successfully scan for STS30 on I2C address 0x4A. Kaveh.M said: Without a breakpoint, nothing different happens from the case I do not have APP_ERROR_CHECK. Debugger gets stuck in the while loop. 
 Thank you for confirming that the addressing and hardware connections of the setup is working as expected, and that the APP_ERROR_CHECK does not trigger - this means that the function call returns NRF_SUCCESS as expected. 
 Kaveh.M said: It seems the originally posted code works when I remove "while (m_xfer_done == false){}" lines in STS30_read_command() and STS30_write_command() functions. 
 Do I really need twi_handler() function in my code? 
 The reason for the m_xfer_done flag in the TWI peripheral examples is that the device might be doing other things in the meantime, while waiting for the transfer to complete. I just looked more closely through your code, and it seems that you do not provide the twi_handler function in your nrf_drv_twi_init call - this is likely the issue here. Since the nrf_drv_twi_init function is provided NULL as the callback function, there will be no twi events forwarded to the application layer. Please add twi_handler as your third argument to nrf_drv_twi_init, and see if this resolves your issue. Best regards, Karl

STS30 temperature sensor I2C code

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