ESP32-CAM-MB + Development Board CH340G

All ESP32 boards running MicroPython.
Target audience: MicroPython users with an ESP32 board.
1vf
Posts: 4
Joined: Sat Mar 27, 2021 12:46 pm

Re: ESP32-CAM-MB + Development Board CH340G

Post by 1vf » Wed Apr 07, 2021 5:44 pm

Hello,

Both IO0 and "GND/R" (reset I guess?) labeled pins are at 3.3V.

Also tried --flash_mode qout and --flash_mode dout, but it didn't help unfortunately.

As for espefuse.py, not completely sure, what to do and how to modify the power supply options. Here is the summary output:

Connecting....
Detecting chip type... ESP32
espefuse.py v3.0
EFUSE_NAME (Block) Description = [Meaningful Value] [Readable/Writeable] (Hex Value)
----------------------------------------------------------------------------------------
Calibration fuses:
BLK3_PART_RESERVE (BLOCK0): BLOCK3 partially served for ADC calibration data = False R/W (0b0)
ADC_VREF (BLOCK0): Voltage reference calibration = 1114 R/W (0b00010)

Config fuses:
XPD_SDIO_FORCE (BLOCK0): Ignore MTDI pin (GPIO12) for VDD_SDIO on reset = False R/W (0b0)
XPD_SDIO_REG (BLOCK0): If XPD_SDIO_FORCE, enable VDD_SDIO reg on reset = False R/W (0b0)
XPD_SDIO_TIEH (BLOCK0): If XPD_SDIO_FORCE & XPD_SDIO_REG = 1.8V R/W (0b0)
CLK8M_FREQ (BLOCK0): 8MHz clock freq override = 55 R/W (0x37)
SPI_PAD_CONFIG_CLK (BLOCK0): Override SD_CLK pad (GPIO6/SPICLK) = 0 R/W (0b00000)
SPI_PAD_CONFIG_Q (BLOCK0): Override SD_DATA_0 pad (GPIO7/SPIQ) = 0 R/W (0b00000)
SPI_PAD_CONFIG_D (BLOCK0): Override SD_DATA_1 pad (GPIO8/SPID) = 0 R/W (0b00000)
SPI_PAD_CONFIG_HD (BLOCK0): Override SD_DATA_2 pad (GPIO9/SPIHD) = 0 R/W (0b00000)
SPI_PAD_CONFIG_CS0 (BLOCK0): Override SD_CMD pad (GPIO11/SPICS0) = 0 R/W (0b00000)
DISABLE_SDIO_HOST (BLOCK0): Disable SDIO host = False R/W (0b0)

Efuse fuses:
WR_DIS (BLOCK0): Efuse write disable mask = 0 R/W (0x0000)
RD_DIS (BLOCK0): Efuse read disable mask = 0 R/W (0x0)
CODING_SCHEME (BLOCK0): Efuse variable block length scheme
= NONE (BLK1-3 len=256 bits) R/W (0b00)
KEY_STATUS (BLOCK0): Usage of efuse block 3 (reserved) = False R/W (0b0)

Identity fuses:
MAC (BLOCK0): Factory MAC Address
= 9c:9c:1f:c8:13:f4 (CRC 0x22 OK) R/W
MAC_CRC (BLOCK0): CRC8 for factory MAC address = 34 R/W (0x22)
CHIP_VER_REV1 (BLOCK0): Silicon Revision 1 = True R/W (0b1)
CHIP_VER_REV2 (BLOCK0): Silicon Revision 2 = False R/W (0b0)
CHIP_VERSION (BLOCK0): Reserved for future chip versions = 2 R/W (0b10)
CHIP_PACKAGE (BLOCK0): Chip package identifier = 0 R/W (0b000)
MAC_VERSION (BLOCK3): Version of the MAC field = 0 R/W (0x00)

Security fuses:
FLASH_CRYPT_CNT (BLOCK0): Flash encryption mode counter = 0 R/W (0b0000000)
UART_DOWNLOAD_DIS (BLOCK0): Disable UART download mode (ESP32 rev3 only) = False R/W (0b0)
FLASH_CRYPT_CONFIG (BLOCK0): Flash encryption config (key tweak bits) = 0 R/W (0x0)
CONSOLE_DEBUG_DISABLE (BLOCK0): Disable ROM BASIC interpreter fallback = True R/W (0b1)
ABS_DONE_0 (BLOCK0): Secure boot V1 is enabled for bootloader image = False R/W (0b0)
ABS_DONE_1 (BLOCK0): Secure boot V2 is enabled for bootloader image = False R/W (0b0)
JTAG_DISABLE (BLOCK0): Disable JTAG = False R/W (0b0)
DISABLE_DL_ENCRYPT (BLOCK0): Disable flash encryption in UART bootloader = False R/W (0b0)
DISABLE_DL_DECRYPT (BLOCK0): Disable flash decryption in UART bootloader = False R/W (0b0)
DISABLE_DL_CACHE (BLOCK0): Disable flash cache in UART bootloader = False R/W (0b0)
BLOCK1 (BLOCK1): Flash encryption key
= 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W
BLOCK2 (BLOCK2): Secure boot key
= 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W
BLOCK3 (BLOCK3): Variable Block 3
= 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W

Flash voltage (VDD_SDIO) determined by GPIO12 on reset (High for 1.8V, Low/NC for 3.3V).

Regards,
Vedran

wangshujun@tom.com
Posts: 24
Joined: Fri Feb 15, 2019 9:22 am

Re: ESP32-CAM-MB + Development Board CH340G

Post by wangshujun@tom.com » Thu Apr 08, 2021 2:35 pm

Can connect smoothly espefuse.py This shows that the operation of en and IO0 is not a problem. The focus is on the flash mode when burning and writing and the hardware connection of io12
If io12 has a pull-up on the hardware, you can use the espefuse.py Configured to a fixed voltage of 3.3V

lorenz
Posts: 8
Joined: Sat Dec 12, 2020 8:11 pm

Re: ESP32-CAM-MB + Development Board CH340G

Post by lorenz » Sat Apr 10, 2021 10:14 am

Hi,

I have bought a few of the esp-cam-mb boards from aliexpress and for me they are working with micropython.

I am using a mac to flash the micropython firmware.
I have observed that the the RST button on the esp-cam-mb board did not work, so I had to press the reset button on the esp-32 ai thinker board.

Code: Select all

# press and hold io0 button and press the rst button on ai thinker board
esptool.py erase_flash
# once you see in the log output that it is erasing you can release the io0 button

# press and hold io0 button and press the rst button on ai thinker board
esptool.py write_flash 0x1000 firmware/micropython-latest.bin
# once you see in the log output that it is erasing you can release the io0 button

# press the reset button once more and then use miniterm or any other serial program to connect. You should then see the micropython repl
Hope that helps a bit.

Lorenz

1vf
Posts: 4
Joined: Sat Mar 27, 2021 12:46 pm

Re: ESP32-CAM-MB + Development Board CH340G

Post by 1vf » Tue Apr 13, 2021 7:19 pm

Hello,

Unfortunately it didn't help. I'm not entirely sure what do you mean by "I had to press the reset button on the esp-32 ai thinker board", aside from "ESP32-CAM-MB", there's only Development Board CH340G with the USB/power and IO0 and RST buttons. I tried holding RST buttons ESP32-CAM-MB and on Development Board CH340G in any combination without success.

@wangshujun: do you suggest I run: espefuse.py set_flash_voltage 3.3V ?

I do see that it helped in some cases:
viewtopic.php?t=4387
https://forum.makerforums.info/t/solved ... s/62851/12
but I'm not sure if it's applicable here.

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