Firmware for STM32F051 based speed controllers for use with multirotors
The AM32 firmware is designed for STM32 ARM processors to control a brushless motor (BLDC). The firmware is intended to be safe and fast with smooth fast startups and linear throttle. It is meant for use with multirotor aircraft and a flight controller. The firmware can also be built with support for crawlers.
AM32 has the following features:
- Firmware upgradable via betaflight passthrough - only support G4, F4 and F7 FCs, and make sure your betaflight firmware is up to date when you try to use passthrough
- Servo PWM, Dshot(300, 600) motor protocol support
- Bi-directional Dshot
- KISS standard ESC telemetry
- Variable PWM frequency
- Sinusoidal startup mode, which is designed to get larger motors up to speed
The latest release of the firmware can be found here.
To configure AM32 and upload firmware you can use the Multi_ESC config tool using Betaflight passthrough. They can be downloaded from here:
Alternately you can use the Online-ESC Configurator to flash or change settings with any web browser that supports web serial.
Target compatibility List can be found here (APR 2021)
To use AM32 firmware on a blank ESC, a bootloader must first be installed using an ST-LINK. Choose the bootloader that matches the signal input pin of the ESC. The compatibility chart has the bootloader pinouts listed. Current bootloaders can be found here.
After the bootloader has been installed the main firmware from can be installed either with the configuration tools and a Betaflight flight controller or a direct connection with a usb serial adapter modified for one wire.
To update an existing AM32 bootloader an update tool can be found here.
There's a dedicated Slack chat channel here:
https://am32-invite.herokuapp.com/
Etiquette: Don't ask to ask and please wait around long enough for a reply - sometimes people are out flying, asleep or at work and can't answer immediately.
A big thanks to all those who contributed time, advice and code to the AM32 project.
Hugo Chiang (Dusking)
Micheal Keller (Mikeller)
ColinNiu
Jacob Walser
And for feedback from pilots and drivers:
Jye Smith
Markus Gritsch
Voodoobrew
(and many more)