dma then 2017

What does DMA mean? What is DMA? The English spelling of DMA is "Direct MemoryAccess, which means direct memory access, is a data exchange mode that directly accesses data from the memory without going through the CPU. In PIO modeCPU control. In DMA mode, the CPU only needs to issue commands to the

In some cases, for example, if you want to use DAC to output a sine wave, the simplest idea is to use a Timer for an interruption and assign a new value to the DAC during the interruption, and the DAC conversion is triggered. In this way, there will be some drawbacks. For example, in a complex system, there will be many interruptions, and Timer's interruption priority cannot always be the highest. Therefore, there may be problems in phase. In addition, interruption increases the power consumptio

Memory ing and DMA, memory ing DMA 1. the implementation process of mmap system calling. The system calling directly maps the device memory to the address space of the user process. 2. How to map the user space memory to the kernel (get_user_pages ). 3. Direct Memory Access (DMA), which enables peripherals to directly access the system memory. Address type in li

lnkscript of ndslib maps the two TCM to 0x0000000 and 0x0b000000. Now that you have a fixed address, you can easily access it. However, as I mentioned earlier, these two blocks of memory space have special purposes, so direct access is not recommended. Compared with itcm, dtcm is more important. Because in this memory, there is a very important object-stack.I will not explain the "stack" in detail. Local variables and function call parameters are transferred by stack.Since

Tags: htm embedded detail Linux SYN Stat management cache. NetHTTP://BLOG.CSDN.NET/LIKEPING/ARTICLE/DETAILS/42235111 DMA management under LinuxHTTP://BLOG.CSDN.NET/SKYFLYING2012/ARTICLE/DETAILS/48023447 Cache and memory consistency.Http://www.360doc.com/content/16/0510/07/478627_557742072.shtmlHTTP://LYL19.BLOG.163.COM/BLOG/STATIC/1942720552013310103745840/DMA Memeryhttp://blog.csdn.net/cywosp/article/detai

DMA is a hardware capability that enables hardware to read and write data directly from main memory, i.e. it can directly use main memory for I/O without the need for processor intervention, which can save processor resources and improve IO throughput across the system because IO operations are relatively slow, If processor resources are used for each IO, there is no thought that it will consume a large amount of CPU time on a single IO, resulting in

Recently, I was busy with the driver, so I sorted out the basic programming of DMA for S3C2410 and the related register operations for DMA.I. Principle of DMA access1. Overview of DMA (driect Memory Access) AccessWhen the system memory needs to quickly transfer big data between high-speed peripherals or different areas of the memory, the query and interruption me

1.DMA Channel The DMA(Direct Memory access) channel is built between the device and RAM, andDMAC(DMA controler) interacts with the device I/O controller to implement data transfer. In the PC, the DMA controller is on the South Bridge on the motherboard that is responsible for managing the I/O bus. A typical PC arch

If you never meet, maybe the mood will never be heavy if you miss it, you may not be able to take it easy in your life. A look is enough to xinhai the hurricaneA deeper understanding of the landscape in the barren land a journey is enough to haggard a weak heartEvery look at the eyes of the ripples will want to tears to death how can not leisurely love and how can not be indifferentJust love each other once is a life without regretsMaybe, never a day as bright as the future, maybe, never the day

Parallel line difference indicator-DMA The DMA indicator is also called the parallel line difference indicator. It is a medium-and short-term indicator in the current stock market analysis Technical indicator. It is often used for the analysis and determination of the index and individual stocks. Section 1 principles and calculation methods of DMA indicators I.

, if you do not open the interruption, you have to clear, in general, the use of it is very troublesome, for nothing more open an interruption. The following code for the STM32F7 serial port 1 DMA send and Serial receiver interrupt program implementation code /** ****************************************************************************** * @file driver_uart.c * @autho R Quentin.que * @version v.0 * @date 2017