micropython-esp32-ulp is an assembler toolchain for the ESP32 ULP (Ultra Low-Power) Co-Processor, written in MicroPython.

It can translate small assembly language programs to a loadable/executable ULP machine code binary, directly on the ESP32 microcontroller.

This is intended as an alternative approach to assembling such programs using the binutils-gdb toolchain (esp32-elf-as) from Espressif on a development machine.

It can also be useful in cases where esp32-elf-as is not available.

The following features are supported:

• the entire ESP32 ULP instruction set
• constants defined with .set
• constants defined with #define
• expressions in assembly code and constant definitions
• RTC convenience macros (e.g. WRITE_RTC_REG)
• many ESP32 ULP code examples found on the web will work unmodified

To get going run the following directly on the ESP32:

# Step 1: Install micropython-esp32-ulp# IMPORTANT: Ensure the ESP32 is connected to a network with internet connectivity.importupipupip.install('micropython-esp32-ulp') # Step 2: Run an example# First, upload examples/counter.py to the ESP32.importcounter

The examples/counter.py example shows how to assemble code, load and run the resulting binary and exchange data between the ULP and the main CPU.

See docs/index.rst.

The minimum supported version of MicroPython is v1.12.

An ESP32 is required to run the ULP machine code binary produced by micropython-esp32-ulp (the ESP32-S2 will not work as it is not binary compatible with the ESP32).

This project is released under the MIT License.