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Using Visual Micro to program the ULX3S ESP32

Similar to the Arduino Blinky for the ESP32 using the Arduino IDE, this example uses the Visual Micro IDE for Visual Studio.

Download the Arduino IDE for Visual Studio and Atmel Studio

or install the Arduino IDE from the Visual Studio Marketplace.

Ensure the FPGA pass-thru code is loaded onto the FPGA, as the ESP32 sits behind the ECP5 FPGA chip:

ESP32-on-ULX3S

Quick Start FPGA passthru

See bin/upload_passthru.sh or bin/upload_passthru.bat

Windows commandline / DOS prompt FPGA passthru

if NOT EXIST c:\workspace mkdir c:\workspace
git clone https://github.com/gojimmypi/ulx3s-examples.git c:\workspace\ulx3s-examples
c:
cd \workspace\ulx3s-examples\bin\
.\ujprog.exe passthru.bit

WSL FPGA passthru

There is still no native USB driver support in WSL, so we expect an error message such as:

ULX2S / ULX3S JTAG programmer v 3.0.92 (built Jun  1 2019 15:29:22)
Cannot find JTAG cable.

We can call the Windows version from the Linux prompt. Note that for some unknown reason, it needs to be called from the Windows file system and not the Linux one. (e.g. not ~/workspace/). Symptoms of running the Windows executable from the WSL filesystem is that no output at all is returned from ujprog.exe.

mkdir -p /mnt/c/workspace/  # this is actually C:\workspace\ to Windows
git clone https://github.com/gojimmypi/ulx3s-examples.git /mnt/c/workspace/ulx3s-examples
cd /mnt/c/workspace/ulx3s-examples/bin/
# ./ujprog.exe -j FLASH passthru.bit # optionally write to flash
./ujprog.exe passthru.bit

Key settings in Visual Micro for ULX3S ESP32:

Note that when in debug, pressing F5 to run will typically pause the app at the first default breakpoint! Use the release configuration to avoid this.

ESP32-on-ULX3S-settings

Visual Micro Commandline Examples:

code_upload.bat and WSL code_upload.sh

See also: