AnsweredAssumed Answered

Problems getting I2C to work on RT 1020

Question asked by Moritz Puchinger on Jun 23, 2020
Latest reply on Jun 29, 2020 by Felipe García



I am trying to set up the i.MX RT1020 so that it can send I²C signals to an Arduino. Here's some information on what I am doing so far:


Part number: MIMXRT1021DAG5A

OS: Zephyr 2.3.0-rc1

Pins: I am using the D14 and D15 pins in the J19 area for SDA (D14) and SCL (D15)


This is my code:


#include <zephyr.h>
#include <sys/printk.h>
#include <device.h>
#include <drivers/i2c.h>

#define HIGH_VALUE 0x01

void main(void) {
   struct device *dev;
   int ret;

   uint8_t data = HIGH_VALUE;

   dev = device_get_binding("I2C_1");
   if(!dev) {
      printk("I2C: Device not found\n");
   } else {
      printk("I2C: Device found\n");
   while(true) {
      ret = i2c_write(dev, &data, sizeof(data), DESTINATION_ADDR);


I am compiling using: west build -p auto -b mimxrt1020_evk

The code compiles without any errors.

When running, it logs "Device found" to my serial console and then repeatedly logs "Trying..." and "done", so the while loop is also getting run.

I am however not getting any I²C signals on my Arduino. I am quite sure that the problem is on the side of the RT1020 since the Arduino would log all I²C inputs to another serial console but it doesn't show anything.


What am I doing wrong? My feeling is that I am either using the wrong ports or there is something wrong with my code.


I hope that I provided enough information for you to understand my issue. Thank you for your help in advance.