Arm

The Nested Vectored Interrupt Controller (NVIC) is the interrupt controller used in ARM Cortex-M series processors. It provides low latency exception and interrupt handling, and manages interrupts in a hierarchical priority-based scheme. The NVIC allows for fast, deterministic interrupt processing and reduced interrupt latency compared to traditional interrupt controllers. What is an Interrupt Controller? An…

The key difference between the ARM7 and Cortex-M3 microcontrollers is that the ARM7 is an older generation 32-bit RISC processor core, while the Cortex-M3 is a newer generation 32-bit ARM processor core specifically designed for microcontroller applications. The Cortex-M3 offers higher performance, more features, and better power efficiency compared to the older ARM7. Overview of…

The ARM architecture refers to a family of reduced instruction set computing (RISC) processors that are widely used in embedded systems and mobile devices. The ARM processors are known for their power efficiency and performance capabilities. Over the years, ARM has introduced several microarchitecture versions with improvements and new features. The major ARM processor families…

The Arm Cortex-M processors utilize a 3-stage instruction pipeline to achieve higher performance compared to simpler single cycle execution. The three stages of the pipeline are Fetch, Decode, and Execute. This allows the processor to work on different steps of multiple instructions simultaneously, increasing instruction throughput. What is Pipelining? Pipelining is a technique used in…

When compiling code for ARM processors using gcc, there are three key compiler flags that control the target processor and floating point options: -mcpu, -mfloat-abi, and -mfpu. Understanding the differences between these flags and how to use them properly can help optimize performance and avoid issues. This article provides an in-depth explanation of what each…

When compiling code for the ARM Cortex-M3 processor, you may encounter an error like “uses VFP register arguments, target CPU does not support ARM mode” or “Target does not support Thumb double precision hardfloat ABI”. This error occurs because the Cortex-M3 does not support passing floating point arguments directly in VFP registers like some other…

The ARM Cortex-M3 processor provides built-in support for multitasking, allowing multiple tasks to run concurrently. This increases overall system performance and responsiveness compared to a simple single-threaded system. However, multitasking brings additional complexity that needs careful management. Here are some tips for effective multitasking on the Cortex-M3. Use a Real-Time Operating System While the Cortex-M3…

The ARM Cortex-M3 is a popular 32-bit processor based on the ARMv7-M architecture. It is designed for low-power embedded applications and includes features like a memory protection unit, single-cycle fast multiply, and low-latency interrupts. Here are some tips and tricks for programming the Cortex-M3 that can help improve performance, reduce code size, and make development…

Debugging ARM Cortex-M3 with OpenOCD and GDB can seem daunting at first, but it becomes easier with some helpful tips and tricks. This comprehensive guide will provide key techniques for efficiently debugging your Cortex-M3 projects. Connecting the Hardware The first step is getting your hardware and connections set up properly. Here are some tips: Configuring…

When it comes to choosing an ARM compiler, developers typically have three main options – IAR, GNU, and LLVM/Clang. Each compiler has its own strengths and weaknesses, and the right choice depends on your specific needs and priorities. This comprehensive guide examines the key factors to consider when comparing these three ARM compilers. Background ARM…