Arduino Due TWI/I2C channel 1

i'm having difficulties getting second i²c channel working correctly.

running example code "i2c digital potentiometer" got expected result. (twi_0.bmp logic analyzer screen cap)

i modified it  channel 1 changing "wire" "wire1" no success. (twi_1.bmp logic analyzer screen cap)

code: [select]

// i2c digital potentiometer
// nicholas zambetti <http://www.zambetti.com>
// , shawn bonkowski <http://people.interaction-ivrea.it/s.bonkowski/>

// demonstrates use of wire library
// controls ad5171 digital potentiometer via i2c/twi

// created 31 march 2006

// example code in public domain.

// example code in public domain.


#include <wire.h>


void setup()
{
  wire1.begin(); // join i2c bus (address optional master)
}

byte val = 0;

void loop()
{
  wire1.begintransmission(44); // transmit device #44 (0x2c)
                              // device address specified in datasheet
  wire1.write(byte(0x00));            // sends instruction byte 
  wire1.write(val);             // sends potentiometer value byte 
  wire1.endtransmission();     // stop transmitting

  val++;        // increment value
  if(val == 64) // if reached 64th position (max)
  {
    val = 0;    // start on lowest value
  }
  delay(1);
}





sda1 , scl1 both have added 1k5 pull-up resistors.
has had similar problem or have suggestion resolve this?

hello silen1985,
the whole due's twi code ok , handles both i2c peripherals (twi/twi1). imho, issue should related hardware. i'd recommend use different pull value 10k. regards,

p

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