Arm

Context switching on Cortex-M microcontrollers requires manually saving and restoring register contents when switching between tasks. This involves stacking key registers onto the process stack during a context switch so their values can be preserved for the next time the task executes. Care must be taken to save all necessary registers in the correct order….

Context switching between threads or tasks on Cortex-M processors involves saving the context of one thread or task, then loading the context of another. A key part of the context is the EXC_RETURN value, which controls the processor state when returning from an exception. Care must be taken when loading the EXC_RETURN value during a…

When an interrupt occurs on a Cortex-M processor, the processor pushes registers onto the stack to save the current state before jumping to the interrupt handler. Understanding the stack frame layout during interrupts is important for debugging and optimizing interrupt performance. What Happens When an Interrupt Occurs On a Cortex-M processor, when an interrupt occurs:…

A round-robin scheduler is a scheduling algorithm that sequentially cycles through a list of tasks, giving each task a slice of time to execute before moving on to the next task. Implementing a round-robin scheduler on Cortex-M microcontrollers can provide predictable multitasking capabilities for real-time embedded applications. Overview of Round-Robin Scheduling The key features of…

The Cortex-M processor implements robust exception handling capabilities to respond to events like exceptions, interrupts, and faults during program execution. The processor automatically saves context, executes exception handlers, and restores context upon return from an exception. This allows Cortex-M based systems to handle exceptions safely and recover program execution. Cortex-M Exception Types There are several…

When working with preemptive multitasking on Cortex-M microcontrollers, it is often necessary to save and restore the context of a task when switching between tasks. The context includes the values of the CPU registers, stack pointer, and other key state information that must be preserved when transitioning between tasks. What is Task Context? The task…

The Cortex-M3 is an ARM processor core designed for microcontroller applications. One of its key features is support for multitasking through preemptive context switching. This allows multiple tasks or threads to share the M3 core by rapidly switching between their execution contexts. What is Context Switching? Context switching refers to the saving and restoring of…

The Controller Area Network (CAN) bus is a robust vehicle bus standard that allows microcontrollers and devices to communicate with each other within a vehicle without a host computer. It is a message-based protocol, designed originally for multiplex electrical wiring within automobiles to save on copper, but is also used in many other contexts. History…

The ARM Cortex-M3 processor is a 32-bit processor, meaning its general purpose registers and main data bus are 32 bits wide. This allows it to process 32-bit data and memory addresses directly in a single cycle. Overview of ARM Cortex-M3 The ARM Cortex-M3 is a member of the Cortex-M series of ARM processors. It is…

The Cortex-M3 processor from ARM has 37 general purpose I/O ports available for use. These 37 GPIO ports allow flexible interfacing with external peripherals and devices. Understanding the number of ports in Cortex-M3 is important for both hardware designers and software developers working with this popular ARM chip. Overview of Cortex-M3 Processor The Cortex-M3 is…