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I need to work on twi compatible with smbus and I2C for NRF5340 DK

Mr.NCK

I need to interface my sensors by using twi. Here one of my sensor is smbus compatible. For I2C, I need to read acknowledge from sensor. So i need reference or samples to work on above requirements with NCS v1.5.0 for nrf5340dk

Thanks & regards

Navin

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  • 0 in reply to Simon

    Hi Simon,

    Thank you very much, I have seen your ncs tutorial series that is very helpful. to get started to create an application nrf5340. I have understood part 1 and part 2.  I have got stuck at Part 3. It was a little difficult. give some implementation examples.

    I have tried to interface the sht20 sensor with nrf5340. My sensor output values are always constant. even I didn't connect my sensor it throws the same values.

    do you have any reference to interface external sensors other than given samples?

    Simon said:
    It seems like the sensor should be compatible with I2C as long as you set the speed to 100kHz. Use the clock-frequency field in an i2c instance to configure the speed (see thingy91_nrf9160_common.dts and dt-bindings/i2c/i2c.h).

    I have tried the above. The same issue followed which I mentioned above.

    Thanks & Regards

    Navin

  • 0 in reply to Mr.NCK
    Mr.NCK said:

    I have tried to interface the sht20 sensor with nrf5340. My sensor output values are always constant. even I didn't connect my sensor it throws the same values.

    do you have any reference to interface external sensors other than given samples?

    It seems like you are creating the driver yourself. I would recommend you to start with the i2c_scanner example, and just see if you can communicate with the sensor. Then you can gradually, step-by-step, build on the example. Write to a register, read a register, read sensor values. Study the datasheet of the SHT20 closely.

    Do you have a logic analyzer? That's a very useful tool that allows you to see what's actually being sent.

    Best regards,

    Simon

  • 0 in reply to Simon

    Simon,

    Thank you for your response.

    Simon said:
    I would recommend you to start with the i2c_scanner example,

    I have tried i2c_scanner_example.

    I can't able to read the device address. I have attached my output terminal below

    Thanks & Regards

    Navin

  • 0 in reply to Mr.NCK

    I made some modifications to the i2c_scanner sample:

    • Changed the name nrf5340pdk_nrf5340_cpuappns.overlay to nrf5340dk_nrf5340_cpuapp.overlay
    • Removed unecessary Kconfigs from the prj.conf
    • Swapped NRF_TWIM1_NS with NRF_TWIM1_S

    Could you test the updated sample with NCS v1.5.1 and the board nrf5340dk_nrf5340_cpuapp?

    i2c_scanner.zip

    Connect the sensor in the following manner:

    Sensor nRF5340 DK
    SDA P1.02 (34-32=2)
    SCL P0.04 (4)
    VIN VDD
    GND GND

    I tested the sample with a MAX4009 GY-49 and it worked fine. I got the following output:

    *** Booting Zephyr OS build v2.4.99-ncs2  ***                                                                                                                               v2.4.99-ncs2  ***
The I2C scanner started
Value of NRF_TWIM1_S->PSEL.SCL : 4
Value of NRF_TWIM1_S->PSEL.SDA : 34
Value of NRF_TWIM1_S->FREQUENCY: 26738688
26738688 -> 100k
0x4b FOUND

    Best regards,

    Simon

  • 0 in reply to Simon

    Hi Simon,

    Thank you, Now I can read address

    I have attached the Output image for your reference. I can read the address of the MPU6050 sensor. But I can't able to read the address of the  SHT20 and MLX96401. 

    Regards, I have tested with the Logic analyzer. I have got a read timeout error.

    Thanks & Regards

    Navin

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