STM32F4 Discovery

Libraries and tutorials for STM32F4 series MCUs by Tilen Majerle

STM32F4 Discovery Blog

STemWin on STM32F429-Discovery board 77

STM32F429 / STM32F429 Discovery

Library 50- STemWin for STM32F429-Discovery

ST provides emWin library from Segger. It is professional GUI (Graphical User Interface), optimized for speed and performance for microcontrollers. ST has it’s own implementation, called STemWin. With this GUI, you can do many thing, of use simple buttons, dialogs, text boxes, to playing videos, displaying pictures, menus, etc. I suggest you that you go to segger’s website and read more about this very useful tool. In my library, I’ve some changes from original ST’s example for STM32F429-Discovery board, because...

Locked OTP Bytes 7

STM32F4 / STM32F4 Discovery / STM32F429 / STM32F429 Discovery

Library 49- One-Time programmable (OTP) bytes on STM32F4

STm32F4xx devices have OTP (One-Time-Programmable) bytes. They can be used for permanent store of configuration data for your device. Bytes are structured in 16 data blocks where each block has 32 data bytes of available memory. There is also 17th block with 16 bytes of data. His “work” is to store information about states of data block, because you can lock each block forever even if it is totally empty. Important notes: When you write data to specific OTP location...

PWM graph 47

STM32F4 / STM32F4 Discovery / STM32F429 / STM32F429 Discovery

Library 48- Measure PWM input signal with STM32F4

First library in 2015 is here. With it, you will be able to measure PWM input signal from “other world”. STM32F4’s timers have capability to make an interrupt on edge, when signal is active on input pin for specific timer. This allows us, to measure signal in input. With a simple calculations, we can detect frequency of signal and duty cycle. Of course, this is not veery accurate, but with 168MHz F407 device, using 32bit TIM2 (high resolution) I got...

Library 47- CRC module on STM32F4 5

STM32F4 / STM32F4 Discovery / STM32F429 / STM32F429 Discovery

Library 47- CRC module on STM32F4

STM32F4xx devices have CRC (Cyclic Redundancy Check) module inside. This is small and useful unit when working with communications. It might become very useful to verify if your packet of data is correct. STM32F4 devices uses “Ethernet” CRC with polynomial below: X32 + X26 + X23 + X22 + X16 + X12 + X11 + X10 +X8 + X7 + X5 + X4 + X2 + X +1 It is quite ugly šŸ˜€ Well, using this module is very easy....

Library 46- Debug STM32F4 device with SWO feature 43

STM32F4 / STM32F4 Discovery / STM32F429 / STM32F429 Discovery / Tutorials

Library 46- Debug STM32F4 device with SWO feature

All Cortex-M4 devices have feature to output different data for debugging. This can be used instead of one USART available in STM32F4 to display data to user when something is going wrong and you want use debug. STM32F4 has SWD (Serial Wire Debug) option for programming/debugging. All STM32 boards, which have ST-Link on board, uses this option. For programming, only clock and data lines are required. Full SWD also enables you to output something from MCU which debugging. This is...

Library 45- Interface backup SRAM on STM32F4 7

STM32F4 / STM32F4 Discovery / STM32F429 / STM32F429 Discovery

Library 45- Interface backup SRAM on STM32F4

Almost all (with few exceptions) STM32F4xx MCUs have internal backup SRAM, which stores data, if power is available at leastĀ on VbatĀ rails. These MCUs have internal 4-kBytes of SRAM.Ā Backup SRAM can be also used as EEPROM, if your Vbat supply is always active, so you can store data which will stay there also if you reset your device. You just have to make sure that you don’t shut down your power supply or re-write them during startup sequence of MCU. Difference...