Daily Archive: July 10, 2014

Library 22- True random number generator for STM32F4 6

Library 22- True random number generator for STM32F4

STM32F4 devices (in most cases) have True Random Number Generator (or RNG). This peripheral can provide 32bit random number. I made a small library, that you can enable and use it very quickly. RNG on STM32F4 is based on analog circuitry. It makes analog noise and that noice 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...

Library 21- Read SD card with FatFs on STM32F4 562

Library 21- Read SD card with FatFs on STM32F4

Finally I got it working properly. Reading SDcard was very awesome for me for first time, so I decided to make a library for STM32F4xx devices and post it to my website. It’s basically just communication interface between STM32F4 and FatFS library by Chan. It supports SPI or SDIO communication. Library also supports USB communication, but for that purpose you need USB stack too. USB is available here. Below I’m showing how to setup everything with STM32F4 to get SD...