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19.7.1.11DMAC Interrupt Callback FunctionThe DMAC interrupt callback function is shown below:Listing 10: Code Listing 20?9 DMAC Interrupt Callback FunctionSwipe left or right to view full content// DMA transmission complete flag volatilebool dmac0_complete_transmission_sign =false; // Transmission count (interrupt count) volatileuint16_t dmac0_transfer_count; /* DMAC interrupt callback function */ voiddmac0_callback(dmac_callback_args_t *p_args) { (void)(p_args); dmac0_complete_transmission_sign =true; dmac0_transfer_count ++; }dmac0_transfer_count is used to record the number of times DMAC interrupts occur.19.7.1.12hal_entry Entry FunctionIn the hal_entry function, the program follows these steps to execute:Call the DMAC_Init function to initialize the DMAC.Call the R_DMAC_Enable function to enable the DMAC so that it can respond to transfer requests.Call the R_DMAC_SoftwareStart function to initiate a software trigger request signal to start the ...

What is a Heterogeneous Development Board?The "heterogeneous development board" we often speak of refers to the integration of two or more different types of processors on a single board.The most common combination is: ARM Processor + FPGA Chip.?ARM: Responsible for general control and system management (such as scheduling, data processing, and other routine tasks).?FPGA: Used to accelerate specific workloads (such as high-speed parallel processing, signal computation, protocol conversion, etc.).Simple Understanding:? ARM is the "general worker," responsible for daily operations.? FPGA is the "customization expert," focusing on efficient processing in specific scenarios.The collaboration between the two ensures system flexibility while meeting high-performance requirements.What is the difference between a heterogeneous development board and a standard development board?Features of a standard development board:? Equipped with only ARM or another single type of processor? Fixed functiona...

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Designing a high-speed PCB can be a rite of passage for many junior-level PCB designers. While intuition and some best practices can make most low-speed PCB’s work just fine, high-speed PCB design relies on impedance control and precise calculations to ensure reliability. The goal of impedance control is to maximize signal power transfer from a driver to receiver, to minimize signal distortion caused by reflections, and to minimize the electromagnetic interference generated by critical signals. The one guiding factor for all things related to impedance control is that as the speed of a signal increases, it starts to behave less and less like a perfect-world model, and more like a transmission line. The burning question in most designers’ heads is, “how important is impedance control in my design?” The answer to which is, as always, it depends. What defines a high-speed signal and when should impedance control be considered? ...

Designing a high-speed PCB can be a rite of passage for many junior-level PCB designers. While intuition and some best practices can make most low-speed PCB’s work just fine, high-speed PCB design relies on impedance control and precise calculations to ensure reliability. The goal of impedance control is to maximize signal power transfer from a driver to receiver, to minimize signal distortion caused by reflections, and to minimize the electromagnetic interference generated by critical signals. The one guiding factor for all things related to impedance control is that as the speed of a signal increases, it starts to behave less and less like a perfect-world model, and more like a transmission line. The burning question in most designers’ heads is, “how important is impedance control in my design?” The answer to which is, as always, it depends. What defines a high-speed signal and when should impedance control be considered?If a connection is not physically short, then impedance contr...

I just designed a switching PSU that converts 120V AC to 42V DC, and is capable of 20amps. Just realized I need to create a dual supply for an audio amp I am creating, so I want to convert my single supply design into a dual supply. Every dual supply schematic I look at, the common ground is connected to the center tap of the transformer. But my single supply PSU does not have a transformer on the high voltage side, so Im just wondering,where would the common ground point even be, and is it even possible to create a dual supply without a transformer?Do I need to add a transformer, or a second bridge rectifier, for a dual supply? I was trying to draw something up with a second bridge, but I just dont see how I would do it. Or could I just invert the voltage after the buck converter/capacitance multiplier? I would add a transformer, if I could find one that can do 20 amps on the secondary, but they are all like $100, unless its only 12V. On aliexpress they sell a +/-35V dual PSU for ar...

A demonstration of near-field magnetic interference and how to shield it. Near-field vs far-field EMC explained.

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