Category: ARM Cortex-M

ST released STM32L4+ family 0

ST released STM32L4+ family

Recently, STMicroelectronics released a new low-power family, STM32L4+, with extended performance (120MHz frequency) and up to 2MB dual bank flash memory and 640kB of RAM memory. Together with graphics support, it makes it the best ultra low-power device on the market for smart watches and other long life-high performance projects. Benchmark result is 150DMIPS or 409 coremarks in ULPbench test by EEMBC. STM32L4+ portfolio STM32L4+ family consists of 3 main derivarions each with optional encryption. You can find 3 different lines,...

STM32 tutorial: Efficiently receive UART data using DMA 4

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 2

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...

HAL Library 32- DMA extension for USART on STM32Fxxx 2

HAL Library 32- DMA extension for USART on STM32Fxxx

USART DMA library allows you to send data via USART in non-blocking mode. It is designed only for TX mode, because my USART library already uses RX interrupts and DMA RX is not necessary for that purpose. This library is extension for my USART library. It requires USART library as basic to make this to work. Library Read more about HAL libraries Features USART extension for non-blocking TX mode Supports all U(S)ART peripherals on STM32F4 and STM32F7 device Supports TX...