What is the role of the GPIO2 pin on the ESP32-C3 chip during reset ? On the demo board it is not connected. From the documentation it seems that there should be a 1 on this pin during reset. However, I have not found information on what happens when there is a zero on this pin.

During normal booting (high state on GPIO 0), it does not matter what the state is on GPIO2. On the other hand, when there is a low state on GPIO0 and GPIO2, after a reset ESP will try to download the bootloader itself over the UART and boot from it, instead of from the one in flash.

I mean ESP32-C3 not ESP32. ESP32-C3 family has three strapping pins: • GPIO2 • GPIO8 • GPIO9

ESP32-C3: Role and consequences of a low state on the GPIO2 pin during reset

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#1 20026979 20 May 2022 18:09

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Post #1
20026979 20 May 2022 18:09

What is the role of the GPIO2 pin on the ESP32-C3 chip during reset ?
On the demo board https://dl.espressif.com/dl/schematics/SCH_ESP32-C3-DEVKITM-1_V1_20200915A.pdf it is not connected.
From the documentation it seems that there should be a 1 on this pin during reset. However, I have not found information on what happens when there is a zero on this pin.
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#2 20027070 20 May 2022 19:29

khoam khoam

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20027070 20 May 2022 19:29

During normal booting (high state on GPIO 0), it does not matter what the state is on GPIO2. On the other hand, when there is a low state on GPIO0 and GPIO2, after a reset ESP will try to download the bootloader itself over the UART and boot from it, instead of from the one in flash.
#3 20027083 20 May 2022 19:37

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20027083 20 May 2022 19:37

khoam wrote:
On the other hand, when there is a low state on GPIO0 and GPIO2, after a reset the ESP will try to download the bootloader itself over the UART and boot from it, instead of from the one in flash.

I mean ESP32-C3 not ESP32.
ESP32-C3 family has three strapping pins:
• GPIO2
• GPIO8
• GPIO9
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ESP32-C3: Role and consequences of a low state on the GPIO2 pin during reset

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