JonathanDotCel / TastefullyNudeMetal

(Almost bare). Disables ESP32 watchdog timer, and stops interrupts on Core1 allowing time-critical GPIO interrupts, bit banging, etc.

TastefullyNude Metal

(Almost bare)

Lets you disable the watchdog on ESP32 core1 (App CPU), and disables the scheduler interrupts.

E.g. Runs a task on core 1 that can take as long as it likes, but without FreeRTOS in unicore mode.

Alternative approach to the BlueRertro's: https://hackaday.io/project/170365-blueretro/log/189836-esp32-rtos-bare-metal-best-of-both-worlds

I'm sure there are plenty of pitfalls to this approach, but it's lightweight, and decent enough for bit banging.

Note: Remember to set LWIP's affinity to core0 via menuconfig, then WIFI will behave.

Troubleshooting

LWIP Affinity?

idf.py menuconfig, /, type task, lwip_tcpip_task_affinity

There's gibberish on the console!

idf.py menuconfig, /, type xtal, ESP32_XTAL_FREQ=26