ESP32C3N4 HARDWARE DESIGN

[zekolii]

My model is ESP32C3N4;
1-Can we debug with USB and program with USB?
2-Can I use GPIO9 pin and CHIP_En pin as output? If I can, how should the wiring diagram be?
3- If we can't use the SPIQ, SPID, SPICLK, SPICS0, SPIWP, SPIHD terminals, why does it say 22 pin GPIO in the specifications? Is there no way we can use it?

[ESP_Sprite]

My model is ESP32C3N4;
1-Can we debug with USB and program with USB?

Yes.

2-Can I use GPIO9 pin and CHIP_En pin as output? If I can, how should the wiring diagram be?

CHIP_EN always is a reset input and cannot be reconfigured. GPIO9 needs to be the correct value on startup, but can be anything afterwards. (You would e.g. use a pullup to set the correct boot-up value and configure it as an output once your app started up)

3- If we can't use the SPIQ, SPID, SPICLK, SPICS0, SPIWP, SPIHD terminals, why does it say 22 pin GPIO in the specifications? Is there no way we can use it?

It's complicated. For most intents and purposes, those pins are not generally usable, but they still technically count as GPIOs.