NUCLEO-G474re Arduino I2C not working.

[BCunn.1]

I'm trying to do a quick eval of a NUCLEO-G474re board for use of the SoC as a product communication controller (I2C, SPI, RS-485, etc.), initially using the Arduino environment for rapid testing. Initial attempt to bring up I2C causes NO activity on SCL/SDA as observed on a logic analyzer.

Relevant code fragments for a DS1683 at 7-bit address 0x6B:

#include <Wire.h>

Wire.begin(); // SCL/SDA on Arduino D15/D14 (G474 PB8/PB9)

 Wire.setClock(100000L); // 100 kHz

 Wire.beginTransmission(0x6B);

 Wire.write(0x01); // Check the Status register

 Wire.requestFrom(0x6B, 1);

 byte RegData = Wire.read();

 Wire.endTransmission();

Am I missing something obvious? Why is the I2C bus quiet?

Thanks!

Edit: Downloaded an I2C Scanner sketch. No I2C activity on the NUCLEO, but works on an Arduino Due.

-BobC

[Foued_KH · Accepted solution]

Hello @BCunn.1​ ,

You can refer to this article : STM32 Arduino (STM32duino) Tutorial (site.com)

#include <Wire.h>
 
void setup() {
 Wire.begin();                
 Serial.begin(9600);    
 Wire.setClock(100000);
 Wire.beginTransmission(deviceAddress);    // get the sensors attention 
 Wire.write(registerAddress);    // move your memory pointer to registerAddress
 Wire.endTransmission();           // completes the ‘move memory pointer’ transaction
int data = 0;
}
 
void loop() {
Wire.requestFrom(deviceAddress, 1); // send me the data from the register
data = Wire.read();             // data from registerAddress
Serial.println(data);   // print the reading
 }

Foued