ESP32-GATEWAY 4-bit SD

[porkmenudo]

Hi, I want to use the Micro-SD in 4-bit mode on ESP32-GATEWAY. Based on the schematic, it seems R9-R11 needs to be filled with 0-ohm resistors for this to happen.



Is this correct? My problem is that filling R11 specifically makes flashing fail. Here are the last lines of the flashing attempt log:

Code Select Expand

Changing baud rate to 460800
Changed.
WARNING: Failed to communicate with the flash chip, read/write operations will fail. Try checking the chip connections or removing any other hardware connected to IOs.
Configuring flash size...
Flash will be erased from 0x00001000 to 0x00007fff...
Flash will be erased from 0x00010000 to 0x00039fff...
Flash will be erased from 0x00008000 to 0x00008fff...
Compressed 25392 bytes to 15880...

A fatal error occurred: Packet content transfer stopped (received 8 bytes)
CMake Error at run_serial_tool.cmake:56 (message):
  C:/Espressif/python_env/idf4.4_py3.8_env/Scripts/python.exe
  C:/Espressif/frameworks/esp-idf-v4.4.2/components/esptool_py/esptool/esptool.py
  --chip esp32 failed


[porkmenudo]

Figured it out shortly. This has something to do with GPIO12 strapping and SD pin conflict. Had to burn the e-fuse so that GPIO12 is no longer a strapping pin.