AS5048A STM32 driver

A small C++17 driver for the AS5048A 14-bit absolute magnetic rotary encoder, built on the STM32G4 HAL. It handles SPI parity, the sensor’s one-frame-delayed replies, angle conversion, magnetic diagnostics, and the volatile zero-position registers.

The AS5048A reports one of 16,384 angular positions per revolution. This is about 0.02197 degrees per count. It senses a diametrically magnetized magnet above the package and provides absolute position after power-up; no homing sequence is required by the sensor itself.

This is an independent driver. Product images, the ams OSRAM mark, and the datasheet remain the property of their respective owner. Always use the bundled datasheet as the authority for electrical limits, magnet placement, timing, and package dimensions.

Start here

• Installation and setup
  • Requirements
  • Clone the driver
  • Link it with CMake
  • STM32CubeMX SPI configuration
• Sensor and wiring
  • Magnet placement
• Using the driver
  • Full validated samples
  • Fast angle polling
  • Zero position

Reference

• API reference
  • As5048a::Pin
  • As5048a::Config
  • Construction and initialization
  • Sampling
  • Zero and error control
  • Status and timing behavior
• Public data types
• Register and protocol reference
• Troubleshooting
• Building this documentation