DC486B (LTC1760) I2C/SMBUS (MCU - STM32F4) Communication problem .

Hi there..

Anyway solved the issue!

As the HAL driver for the I2C (STM32F4) has many variants and one works for the SMBUS related devices is

"Interrupt/Polling mode IO MEM operation". And the I2C in SMBUS configuration is still not working (FW V27.1) (many issues with internal state handling!).

Hi,

I am trying to communicate with the LTC1760 (integrated in the 486B Demo board) by using Arduino, but it seems not to work. Can you give me some suggestions? I attach the code I used.

-----------------------------------------------------------------------

#include <Wire.h>

void setup()
{
   Wire.begin();
   Serial.begin(9600);
}

uint8_t address = 0x0A; // 0x14, but Wire i2c adressing uses the high 7 bits so shift right
uint8_t reg = 0x04; // BatterySystemInfo() register
uint8_t numBtyes = 2;

void loop()
{
   Wire.beginTransmission(address);
   Wire.write(byte(reg)); // sets register pointer
   Wire.endTransmission(false); // repeated start

   Wire.requestFrom(address, numBtyes); // request 2 bytes from slave device #112

   int reading = 0;
   if (Wire.available() >= numBtyes)
   {
      reading = Wire.read(); // receive low byte
      reading |= Wire.read() << 8; // receive high byte
      printHex(reading, 4);
   }

   else // nothing was received
   {
      Serial.println("Nothing Received");
   }

   delay(1000);
}

void printHex(int num, int precision)

{
   char tmp[16];
   char format[128];

   sprintf(format, "0x%%.%dX", precision);

   sprintf(tmp, format, num);
   Serial.println(tmp);
}

-----------------------------------------------------------------------

Hi,

I am trying to communicate with the LTC1760 (integrated in the 486B Demo board) by using Arduino, but it seems not to work. Can you give me some suggestions? I attach the code I used.

-----------------------------------------------------------------------

#include <Wire.h>

void setup()
{
   Wire.begin();
   Serial.begin(9600);
}

uint8_t address = 0x0A; // 0x14, but Wire i2c adressing uses the high 7 bits so shift right
uint8_t reg = 0x04; // BatterySystemInfo() register
uint8_t numBtyes = 2;

void loop()
{
   Wire.beginTransmission(address);
   Wire.write(byte(reg)); // sets register pointer
   Wire.endTransmission(false); // repeated start

   Wire.requestFrom(address, numBtyes); // request 2 bytes from slave device #112

   int reading = 0;
   if (Wire.available() >= numBtyes)
   {
      reading = Wire.read(); // receive low byte
      reading |= Wire.read() << 8; // receive high byte
      printHex(reading, 4);
   }

   else // nothing was received
   {
      Serial.println("Nothing Received");
   }

   delay(1000);
}

void printHex(int num, int precision)

{
   char tmp[16];
   char format[128];

   sprintf(format, "0x%%.%dX", precision);

   sprintf(tmp, format, num);
   Serial.println(tmp);
}

-----------------------------------------------------------------------