Hello again,

After taking some time off from this project I came back to it and realized I never soldered the ground pad underneath the ESP32-C3 chip, stupid mistake. I must've simply had a enormous brain fart when soldering.

Everything works as expected now.

Sorry for this.

No, not really... the series component indicated by the hardware design guideline is a zero-ohm resistor, possibly as a placeholder if you need something there, but I haven't seen a situation where it actually is needed. One thing you may try is to feed an external 40MHz signal into XTAL_P. If that...

If pin 22,23,24 are used? These pins could not be used. As for the strange crystal figure, do you have our module on your hand? Could you try to solder your crystal on our module? Or solder our crystal on your PCB? You could also swap ESP32-C3 chip and try. And how is your PCB layout around crystal...

The thing is that on all current ESP chips, the crystal needs to be running before the CPU will try to boot from anything, so regardless of bootstrap pins or flash contents you should still see activity on the crystal. Can you see anything from my schematic that would cause problems? The series com...

I've tried removing excess flux and still nothing. There is about 0.5 V DC on the Crystal, how do I know what DC I should expect? Couldn't find anything in the datasheet. I'm trying to find if there is some way to check if the C3 is working properly together with the crystal.

The thing is that on all current ESP chips, the crystal needs to be running before the CPU will try to boot from anything, so regardless of bootstrap pins or flash contents you should still see activity on the crystal. Alright, I think I understand. I've tried choosing the right booting mode now. A...

Yes I'm sure. However, I haven't tried pulling down GPIO9 to enter download mode after correcting the data lines from USB, I'm guessing that the crystal won't start to oscillate properly if the MCU isn't booting properly? Currently the MCU is trying to boot from memory but there is nothing on my mem...

Update: I've swapped the USB data lines so that they are correct now. However, the Crystal problem still remains. I get the same signal on the data lines as on the Crystal (shown on the attachments).

C18 is not connected in your schematic (on purpose or otherwise). You do need that as it forms part of the RC network that properly resets the C3. Also, Vdd_spi generally needs an 100nF capacitor to ground. Both things should not stop the crystal from functioning, though; I'm afraid I have no idea ...

I have a custom ESP32-C3 board derived from the reference manual, it has all necessary decoupling capacitors and inductors for Vdd. I've measured 3.3V on Vdd going to all power pins on the ESP32. My USB is connected to the ESP32 as well (I use the internal USB/JTAG converter) but my PC won't detect ...