Author: tilz0R

STM32F7-Discovery. source:st.com 30

New STM32F7-Discovery board

After STM32F411-Nucleo, STM32F439-Eval board, ST sends me a new discovery board, STM32F7-Discovery. This is a very powerful discovery board according to other series. It is also very big with a lot of features. The STM32F7 discovery kit allows users to develop and share applications with the STM32F7 Series microcontollers based on ARM® Cortex®-M7 core. The discovery kit enables a wide diversity of applications taking benefit from audio, multi-sensor support, graphics, security, video and high-speed connectivity features. The Arduino connectivity support...

Disable peripherals in debug mode on STM32F4xx 0

Disable peripherals in debug mode on STM32F4xx

Have you ever used watchdog in your application? Have you ever debug your application when watchdog was enabled and you hit stop? Watchdog did not stop in this case and when you pressed “continue” in your debugger, your program starts over because WDG has reset your system. One choice is that you remove line where you initialize IWDG, but you then must recompile and redownload and all that stuff. Wasting useful time. To avoid this problem, STM32 devices have possibility...

How to properly enable/disable interrupts in ARM Cortex-M? 8

How to properly enable/disable interrupts in ARM Cortex-M?

Point of this post is not how to use NVIC (Nested Vectored Interrupt Controller) in Cortex-M processors but how to disable/enable interrupts properly for your system to avoid strange behaviours in your code. Let’s assume you have 2 functions, which do some important stuff and they have to make sure that noone interrupts these 2 functions

ARM Cortex-M SCB ICSR register structure. From arm.com 1

Get interrupt execution status on Cortex-M processors

You might come to a situation when you wanna know if current code is executing inside interrupt or not. This might be handy when you do a library and you have one function which you wanna call in interrupt handler for specific event or without interrupt handler, buf wanna execute something specific in function only if you are currently in interrupt. You can create 2 different functions of course, but what if you have one very big function, and for...

Library 63- DMA for STM32F4xx 12

Library 63- DMA for STM32F4xx

Having each stream on separate bits for checking flags has really annoying for me! I had to made a library for DMA which will handle all that stuff any maybe a little more for me because it is really stressfull, when I have to change DMA stream. Then you have to change interrupt handler function name, all flag bit locations and so on. Too much work for easily fail and bug is here! To enable/disable interrupts, get/clear flags, you have to...

FFT result of matlab generated signal 55

Library 62- Fast Fourier Transform (FFT) for STM32F4xx

Here is an example of Fast Fourier Transform on STM32F4xx devices. Today, I was looking something on ARM DSP documentation and I saw that some functions for FFT used in my example are deprecated and will be removed in future. That was the main reason I decided to make a library for FFT on STM32F4xx. To use this library, some third-party libraries are also required. All these required files can be found in STM32F4xx Standard peripheral drivers and DSP instructions provided...