HAL Library 18- RNG for STM32Fxxx

STM32Fxxx devices (in most cases) have True Random Number Generator (or RNG). This peripheral can provide 32-bits random number. I made a small library, that you can enable and use it very quickly which is compatible with HAL based drivers.

RNG on STM32Fxxx is based on analog circuitry. It makes analog noise and that noise is connected to linear shift register. Analog circuitry is designed from ring oscillators whose outputs are XORed. For RNG circuitry is also separate LFSR clock and is independent from System clock. This allows RNG to be independent from system clock between different STM32Fxxx devices.


Read more about new HAL libraries


  • True random number generator
  • Supports 32-bit numbers


  • HAL
  • TM
    • STM32Fxxx HAL
    • defines.h

Functions and enumerations


Project is available on Github, download all libraries below.

TM STM32 Libraries

STM32 libraries based on STM32Fxxx HAL drivers.


Owner of this site. Also electronic enthusiasts, web developer, 3D printer fan, handball player and more. Big fan of STM32F4 devices. In anticipation of the new Discovery board for STM32F7 lines.

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