Tagged: stm32

Tutorial: Control WS2812B leds with STM32 0

Tutorial: Control WS2812B leds with STM32

In this tutorial I will explain how to drive WS2812B with STM32 using TIM PWM and DMA peripherals in the most efficient way by using minimum amount of RAM, required to process all leds. There is a good explanation, already available on the web. If you have no experience with WS2812B leds, I strongly recommend you to read the blog post. It is very well written, but it has one major issue. It uses 24 words of RAM for each LED,...

1-Wire over UART 0

1-Wire over UART

Today’s application mostly use somekind of operating system on microcontroller. Since these apps are not really real time anymore, keeping standard 1-Wire protocol developed with delays in software may make programmer’s life much harder and annoying. UART and 1-Wire protocols have 2 things in common: To reset 1-Wire network, we can use 9600 bauds on UART To read/write 1-Wire bit, we can use 115200 bauds on UART Detailed timings for the UART reset sequence, write/read bit can be found on...

ST acquries Atollic 0

ST acquired Atollic to enrich STM32 ecosystem

STMicroelectronics has acquired Atollic few days ago to enrich STM32 portfolio and ecosystem support for customers. Atollic is known by its very professional toosl for ARM based devices. It features free TrueSTUDIO Eclipse based IDE with GCC compiler and packet together with many great features developed by Atollic such as HardFault exception debugging tool, RTOS thread debugging and many other. This acquisition means that TrueSTUDIO will be now part of STM32Cube ecosystem and will be available for free for STM32...

STM32 tutorial: Efficiently receive UART data using DMA 20

STM32 tutorial: Efficiently receive UART data using DMA

U(S)ART peripheral can work very good by using RXNE (Receive Not Empty) for each byte separatelly. In this case, every received byte is manipulated by CPU by jumping to appropriate UART interrupt service routine. To allow CPU to do fully other job when we receive UART data at high speed we can use DMA (Direct Memory Access) to offload CPU. We can think of DMA as co-processor who can only transfer data between different memories, in our case between peripheral data register UART...

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EasyGUI preview on STM32F7-Discovery

Last 2 months I was working hard to build a platform independent graphical user interface library for embedded systems. I called it EasyGUI because idea behind is very simple library with support for custom user based widgets with touch and keyboard support. So far I built these features: Unlimited widgets (limited to RAM memory) Support for widgets which support children widgets (windows, panels, etc) Support for touch and keyboard events Support for UTF-8 encode and decode functions Support for custom...

Tutorial – Jump to system memory from software on STM32 4

Tutorial – Jump to system memory from software on STM32

One of you are already familiar with STM32 feature of embedded bootloader for software download to flash. This memory is called system memory and is normally accessible with BOOT configuration (either pin hardware or option bytes (later OB) in flash software). Normally, if you want to jump to system memory, you have to setup pin/OB and reset device. If you have OB setup, this is ok, but since you need at least one BOOT pin in hardware, this can lead to hardware...