TWIM (I2C) on NCS is not working properly.

[Yoshihiro Goto]

First of all, the fast mode should be 400kHz, but it seems to be only 200kHz according to the waveform. Also, the duty cycle seems to be wrong.

Secondly, It seems that CONFIG_I2C_CALLBACK is not working at all. I have written the callback function as follows, but it is not called.

/* Callback */

K_SEM_DEFINE(k_sem, 0, 1);

static void twim_callback(const struct device *dev, int result, void *data)

{

    printk("Callback\n");

    k_sem_give(&k_sem);

}

That is obvious since there is no log display and no semaphore to go through.

I am working on a project using TWIM and I hope these bugs will be fixed soon.

[Michal]

Hello again,

Sorry for the delay, I was on a sick leave for a few days.

Here is my code, but like I said, it is just the example, with changed I2C address and added one line for changing the speed in main().

This is the added line:

// change the I2C speed to 400 kHz
	i2c_configure(i2c_dev, I2C_SPEED_SET(I2C_SPEED_FAST));

And this is the source code (NCS 2.2.0):

1856.i2c_fujitsu_fram_i2c_speed.zip

Best regards,

Michal

[Yoshihiro Goto]

I tried your project as i2c_fujitsu_fram, but i2c waveform still seems to be 200kHz.
In addtion, I tried various things as other possibilities.
1. changing to nRF52832 and nRF5340 evaluation boards (nRF5340 eval board's I2C did not work... :-<).
2. removing the debugging option.
But the results were the same.

Hmmm, what else is different?

[Yoshihiro Goto]

>nRF5340 eval board's I2C did not work... :-<

Maybe the internal pull-ups are not working?
I don't know the truth because no device connected.

[Michal]

Hmm, I had a device connected for testing purposes, that's the biggest difference.

I will check it with the device disconnected and see if there are any big differences.

I am also pretty sure that I have used the nRF5340 DK I2C without issues.

Could you send me the compiled zephyr.hex of my project? Just so that I can check the exact same binary that you have used.

Best regards,

Michal