Hello,

I am having an issue with the teensy 3.2 I2C communication. I am using a PI4IOE5V96248 port expander with all address lines to GND (address 0x20), RST pulled high, INT pulled high. I cannot communicate with the chip even though I was able to communicate via I2C with two teensys. I have tried the scanner and advanced scanner sketches to no avail. Upon applying an oscilloscope it seems the teensy is sending a message and it is not being acknowledged by the chip. This prompted me to get a new one but the communication with the new one isn't working either (have not applied oscilloscope to the new chip yet). Yes I have tried switching the Data and CLK lines. Any help would be greatly appreciated!

Code:

Code:
#include <Wire.h>

byte portRead[6];
uint8_t ADDR = 32;
short int BYTES = 6;

void setup() 
{
  Wire.setSDA(18);
  Wire.setSCL(19);
  Wire.begin();

  Serial.begin(115200);
}

void loop() 
{
  Wire.requestFrom(ADDR, BYTES);
  Serial.println(1);

  int i = 0;
  while(Wire.available())
  {
    portRead[i] = Wire.read();
    Serial.print(portRead[i], BIN);
    i++;
  }

  Serial.println();

  delay(10);
}