Arm

The watchdog is a critical component in the ARM Cortex series of processors that is responsible for detecting faults and recovering the system. It acts as a monitor that can reset the processor if needed to maintain reliable operation. Overview of the ARM Cortex Series The ARM Cortex series is a range of 32-bit and…

When trying to compile code for ARM Cortex devices using the arm-none-eabi-gcc toolchain, you may encounter confusing error messages stating that certain functionality “is not implemented and will always fail”. This typically occurs when the code uses features not supported by the version of GCC being used, or relies on libraries/headers not provided with the…

There are several potential reasons why Cortex-M4 assembly code may execute slower than expected. The most common causes include inefficient code, pipeline stalls, memory access delays, and incorrect cycle timing assumptions. Inefficient Code One of the most frequent reasons assembly runs slower is simply inefficient code. Some common examples include: Reviewing algorithm efficiency and minimizing…

An ISB (Instruction Synchronization Barrier) is needed after a WFI (Wait For Interrupt) instruction in Cortex-M based microcontrollers running FreeRTOS to ensure proper synchronization between the FreeRTOS scheduler and interrupt handling. The key reason is that the Cortex-M processor may speculatively fetch instructions ahead of the current instruction stream, which can lead to race conditions…

The ARM Cortex architecture provides two instructions for entering sleep or low power mode – WFE (Wait For Event) and WFI (Wait For Interrupt). Understanding the differences between WFE and WFI is important for optimizing power consumption and wakeup latency in ARM-based systems. What is WFE? WFE (Wait For Event) instructs the processor to enter…

The ARM Cortex architecture provides two instructions for entering sleep or low power mode – WFE (Wait For Event) and WFI (Wait For Interrupt). Understanding the differences between WFE and WFI is important for optimizing power consumption and wakeup latency in ARM-based systems. What is WFE? WFE (Wait For Event) instructs the processor to enter…

The ARM Cortex processor architecture provides two low-power states for reducing power consumption when the processor is idle: Wait For Interrupt (WFI) and Wait For Event (WFE). The key difference between WFI and WFE is that WFI simply puts the processor to sleep until the next interrupt wakes it up, while WFE allows the processor…

The short answer is no, Arduino does not use ARM architecture. Arduino boards are based on 8-bit and 32-bit AVR microcontrollers made by Microchip Technology, whereas ARM processors are designed and licensed by ARM Holdings. However, some Arduino compatible boards do use ARM chips, so there can be some confusion around this. Background on Arduino…

The key differences between Arduino and ARM processors come down to architecture, performance, applications, and cost. Arduino is based on simple AVR microcontrollers while ARM offers a family of more powerful and customizable processors. Arduino is designed for simpler projects and prototyping while ARM powers more complex devices including smartphones and tablets. Ultimately, Arduino offers…

The Cortex-M4 is an advancement over the earlier Cortex-M3 microcontroller core from ARM. It builds on the strengths of the M3 design while adding several key features to improve performance, efficiency, and capabilities. Some of the most significant enhancements of the M4 compared to the M3 include: Floating Point Unit One major addition in the…