I need help for nrf5340 with I2c

[Mr.NCK]

Hi,

I am trying to learn the I2c with nrf5340 PDK. I need to interface Sht20 and Mlx90614 with nrf5340PDK. I need to know the procedures regards this on NRF Connect SDK

Thanks & Regards 

Navin

[Albrecht Markus Schellenberger]

Thanks a lot for the feedback, Navin!

Could you please add:

CONFIG_CBPRINTF_FP_SUPPORT=y

to prj.conf and replace printf with printk?

Does that make any difference?

Regards,

Markus

[Mr.NCK]

Hey Markus,

After the changes have done which you are said. I can't able to open my project actually.

I have made some changes in my code and I got readings. But Readings from sensors are not varied. Can you help me regards?

for clear understandings, I have tried to rewrite the Arduino library code to nrf  I2C

 /**********Arduino Code***********\
 
 uint16_t result;

    Wire.beginTransmission(eSHT2xAddress);
    Wire.write(command);
    delay(100);
    Wire.endTransmission();

    Wire.requestFrom(eSHT2xAddress, 3);
    uint32_t timeout = millis() + 300;       // Don't hang here for more than 300ms
    while (Wire.available() < 3) {
        if ((millis() - timeout) > 0) {
            return 0;
        }
    }

    //Store the result
    result = Wire.read() << 8;
    result += Wire.read();
    result &= ~0x0003;   // clear two low bits (status bits)

    //Clear the final byte from the buffer
    Wire.read();

    return result;

I have tried to rewrite the above lines  to the below-mentioned code

const struct device *i2c_dev;

  uint16_t result;
  uint16_t buff[10];

  i2c_dev = device_get_binding("I2C_1");


   i2c_write(i2c_dev,command,sizeof(command), eSHT2xAddress);
     k_msleep(300);

  result = i2c_read(i2c_dev, buff, sizeof(buff),  eSHT2xAddress)<< 8;
   result += i2c_read(i2c_dev, buff, sizeof(buff),  eSHT2xAddress);
    result &= ~0x0003;

    return result;

 

Kindly, help me to get output.

Thanks & Regards

Navin

[xueliqi]

Hello, would you like to share an example of SHT20? Thank you very much