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nidhi singh
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nidhi singh
Asked: November 14, 2022In:
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Hi there! I’m designing a PCB at the moment using the ESP32- C3-MINI-1. One thing I’m wondering is, how to design the board in such a way, that I’m suitable to upload my application without pressing the boot and enable buttons ...Read more

Hi there!

I’m designing a PCB at the moment using the ESP32- C3-MINI-1.
One thing I’m wondering is, how to design the board in such a way, that I’m suitable to upload my application without pressing the boot and enable buttons without using an external USB to Serial CP 2102 or similar.
For the ESP32- WROOM- 32D it was possible to use a configuration of 2 transistors, which brought the ESP into upload mode.

I have not seen anything similar for the ESP32- C3- MINI without a USB to the serial- adapter.
How would this be achieved here?

I am thankful for any assistance.

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esp32ESP32-C3esp32-c3-mini-1esp32-wroom-32dpcbusbwroom
  1. Alex thomas

    Still, you would use exactly the same circuit but with IO0 replaced with IO0, If you were to use something like a CP2102 or other USB-serial chip. Still, you generally do not need the auto-reset circuit as that functionality is built-in If you are intending to use GPIO18/ 19 to program the ESP32C3 dRead more

    Still, you would use exactly the same circuit but with IO0 replaced with IO0, If you were to use something like a CP2102 or other USB-serial chip.

    Still, you generally do not need the auto-reset circuit as that functionality is built-in If you are intending to use GPIO18/ 19 to program the ESP32C3 directly. (But do note that you may want to have * some * way to manually put the C3 into download mode while developing if you do something that stops the internal USB-serial- JTAG from working, like accidentally configuring the USB pins as GPIOs).

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vikas Nagpal
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vikas Nagpal
Asked: November 4, 2022In:
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Hello, I am going to flash the controller via ESP- PROG Board. Do I need external quartz for the controller in this case? Thank you for your help!

Hello,

I am going to flash the controller via ESP- PROG Board.
Do I need external quartz for the controller in this case?

Thank you for your help!

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boardconnectivityesp- progesp32ESP32-C3flashingwireless
  1. ashishgawade

    Yes, the C3 always needs a crystal to do anything, including flashing.

    Yes, the C3 always needs a crystal to do anything, including flashing.

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nidhi singh
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nidhi singh
Asked: November 1, 2022In:
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Hii,  I’m designing a dev board based on ESP32- C3 (ESP32- C3FN4) and I’m not sure if I’m good with connections for download boot. Is it enough to put tactile switched on GPIO2 and GPIO8 towards VCC and pull down ...Read more

Hii,  I’m designing a dev board based on ESP32- C3 (ESP32- C3FN4) and I’m not sure if I’m good with connections for download boot.
Is it enough to put tactile switched on GPIO2 and GPIO8 towards VCC and pull down on GPIO9?

Also, should I include a connector in case the device needs to be flashed?

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bootdeviceesp32ESP32-C3gpio
  1. Alex thomas

    Hello, You need to start your esp32 with the Low position on the Boot pin to begin the bootloader. In normal mode, u can hold a HIGH position on this pin by pullup him up with 10k, for example. Generally, you can use 2 buttons for switching modes, 1- to connect the boot pin to GND, 2- to pull the RSRead more

    Hello, You need to start your esp32 with the Low position on the Boot pin to begin the bootloader. In normal mode, u can hold a HIGH position on this pin by pullup him up with 10k, for example. Generally, you can use 2 buttons for switching modes, 1- to connect the boot pin to GND, 2- to pull the RST( EN) pin to GND- for resuming esp32 (you need to pull up it too). Also, you can use special schemes which will do it automatically.

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Alex thomas
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Alex thomas
Asked: September 7, 2022In:
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Hello, I have tested ESP32- C3-MINI-1 module thanks to ESP32- C3- DevKit- 1. Very satisfied, I plan to use ESP32- C3-MINI-1 module on my futures PCB designs. When my PCB manufacturer will reference some ESP32- C3-MINI-1 module, is there a firmware ...Read more

Hello,

I have tested ESP32- C3-MINI-1 module thanks to ESP32- C3- DevKit- 1.
Very satisfied, I plan to use ESP32- C3-MINI-1 module on my futures PCB designs.
When my PCB manufacturer will reference some ESP32- C3-MINI-1 module, is there a firmware pre-programmed?
Does that default firmware/ bootloader allows me to upload my Arduino operation via uart ( RX0/ TX0, or make in USB Serial) like I do with my ESP32- C3- DevKit- 1 with Arduino IDE?

Or do I need to firstly flash a bootloader through some JTAG or SPI?

Thank you!

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c3-miniesp32ESP32-C3pcbusb
  1. vikas Nagpal

    There either is no firmware in flash, or a testing or AT firmware that is likely not useful. That doesn't matter, however, because: Every ESP32 (including C3, S3, ...) has a hardcoded, unchangable and un-erasable ROM that contains a bootloader that allows you to do these things (as long as you don'tRead more

    There either is no firmware in flash, or a testing or AT firmware that is likely not useful. That doesn’t matter, however, because: Every ESP32 (including C3, S3, …) has a hardcoded, unchangable and un-erasable ROM that contains a bootloader that allows you to do these things (as long as you don’t set the efuse to disable them). So whatever firmware the module comes with, you will be able to reprogram it using UART or USB.

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Linto
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Linto
Asked: July 1, 2022In:
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We will use a ESP32-C3FH4 in a project. We will not have a external flash. Is it possible to use all GPIO’s including the ones dedicated to flash SPI as plane I/O’s?

We will use a ESP32-C3FH4 in a project. We will not have a external flash. Is it possible to use all GPIO’s including the ones dedicated to flash SPI as plane I/O’s?

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ESP32-C3esp32-c3fh4espressifflash spigpioi/o's
  1. pallavi sharma

    No. Internal flash still occupies some GPIOs.

    No. Internal flash still occupies some GPIOs.

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