Use esp32 in real-time without OS.
! Warning !
All parts are not done !
You'll need xtensa-esp32-elf-gcc to compile project.
Instruction from https://docs.espressif.com/projects/esp-idf/en/latest/get-started/linux-setup-scratch.html
Once you have the binaries, change the path of binaries in "Header.mk"
(default : ~/esp/xtensa-esp32-elf).
make or make build will compile objects files in "builds" folder.
You'll need esptool.
Flash the binary at address 0x1000.
For ESP32 (4MB) :
esptool.py -c esp32 write_flash 0x1000 project.bin
For ESP32-PICO-D4 (4MB) :
esptool.py -c esp32 write_flash -sc 6,17,8,11,16 0x1000 project.bin
Check write_flash options for others esp32 configurations.
You can use this template as base program.