@bipolaron@scholar.social
I've just received my second revision of an ESP32-C3 prototyping board, and I've fixed an issue in my first board, which had a short circuit across the RXD and TXD pins. I've also added a CP2102N chip to connect to USB. Also, I've tried to add two buttons for pulling BOOT and RESET pins low. The buttons don't work, but I can pull the pins low manually for now.
When I try to program the chip, the CP2102N shows up as a USB device in my Linux system, but it still won't program the ESP32-C3, so I'm facing a debugging problem that I haven't yet solved.
I notice that the board is only drawing 10mA, and it makes me think it might not be booting up at all. When I pull EN pin low, current draw goes to 0mA, which is good.
I'm wondering if the 40MHz crystal is oscillating correctly, but I'm not sure if I even have the tools to measure it. When I put my 100MHz digital oscilloscope probe against the crystal, it shows a flat line around 1V. Reading the design guidelines for the ESP32-C3, it requires an oscillation of at least 500mV, which I'm definitely not seeing on my scope. Also, when I look at the datasheet for the crystal, it doesn't show such a "minimal oscillation voltage" statistic.
I can't find a recommended crystal part number anywhere, so I chose this crystal: ECS-400-10-37B2-CKY-TR
I'm trying to follow these hardware design notes for the ESP32-C3 hardware: https://docs.espressif.com/projects/esp-hardware-design-guidelines/en/latest/esp32c3/schematic-checklist.html#clock-source
Any ideas?
