I designed a board based on different circuits available online and I just received my assembled board but I'm not able to program the ESP Pico D4 module. The USB connection is successfully made with my computer but I get a timeout error when trying to flash the module with ESPIDF.
This is what I checked for now :
- All the connections seems to be OK, the only one I couldn't check is the ground connection below the module. I only did one small via to ground before I saw that ESP Pico Kit had several vias to connect the module to ground. Is it possible to check that module is connected to ground ?
- All pins requiring 3.3V are connected to 3.3V.
- IO0 and EN pins seems to be triggered correctly by the USB-UART module. (Quick check with an oscilloscope)
You can find the schematics attached.
Thanks a lot !