[EDITED BY MODERATOR MOVING THE FIGURES TO THE BOTTOM WHERE THEY SEEMED TO BELONG ACCORDING TO THE TEXT]

Hello everyone,

I’ve developed a board that allows levitating a magnet using a feedback control system. It’s powered by a 12V jack and controlled by a Teensy 4.1 microcontroller. Everything works fine with this setup.

For version 2, I decided to replace the external power supply with USB-C to simplify things. After some research, I opted for the FUSB302 and designed my circuit based on the component's datasheet. I had my board printed, and I’ve just received it.

I’m currently testing to ensure the hardware works properly. For that, I’m using the open-source project available here: https://github.com/ReclaimerLabs/FUSB302. I was able to retrieve the USB-C chip ID, check the polarity of the CC pins, and set the CC pins. This leads me to believe the hardware is functioning, but maybe I missed something?

The issue comes after that, when the code gets stuck at the .get_message function. I tried debugging with serial prints, but as my skills are limited, I started digging into the libraries and suspect the problem lies in the following function call:

int FUSB302::tcpc_xfer(const uint8_t *out, int out_size,
uint8_t *in, int in_size, int flags) {
Wire1.beginTransmission(FUSB302_I2C_SLAVE_ADDR);
for (; out_size > 0; out_size--) {
Wire1.write(*out);
out++;
}

if (in_size) {
Wire1.endTransmission(false);
Wire1.requestFrom(FUSB302_I2C_SLAVE_ADDR, in_size, (flags & I2C_XFER_STOP));
for (; in_size > 0; in_size--) {
*in = Wire1.read();
in++;
}
} else {
Wire1.endTransmission(flags & I2C_XFER_STOP);
}
}
I can’t seem to pinpoint the root of the problem. Could it be related to a hardware issue, flag configuration, or something else?

You can find the full software part on GitHub. The only change I made was switching from "Wire" to "Wire1" due to my connection choice on the Teensy.

Below is my electrical schematic.

Thanks in advance for your help and advice!

 

I cannot read your schematic. Please try again.

 

I cannot read your schematic. Please try again.

@DickCappels it appears the TS meant for the two figures to appear at the bottom of the post. I moved them but if this is incorrect he can certainly edit the post to make it however is appropriate.

 

I m sorry, it's the first time, i use a forum