PendSV and SysTick exceptions in ARM Architecture - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to identify the exception used for system tick timer interrupts.

ARM Architecture

void SysTick_Handler(void) {
    // This function handles the [1] exception
}

Drag options to blanks, or click blank then click option'

ASysTick

BPendSV

CHardFault

DNMI

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing PendSV with SysTick exception.

Using HardFault or NMI which are unrelated to system tick timer.

The SysTick exception is triggered by the system timer to generate periodic interrupts.

2fill in blank

medium

Complete the sentence to describe the purpose of the PendSV exception.

ARM Architecture

The PendSV exception is mainly used for [1] in ARM Cortex-M processors.

Drag options to blanks, or click blank then click option'

Aresetting the processor

Bsystem tick timing

Cerror handling

Dcontext switching

Attempts:

3 left

💡 Hint

Common Mistakes

Thinking PendSV handles system tick timing.

Confusing PendSV with reset or error exceptions.

PendSV is designed to handle context switching in operating systems on ARM Cortex-M.

3fill in blank

hard

Fix the error in the description of SysTick and PendSV exceptions.

ARM Architecture

SysTick is used for [1] while PendSV is used for system tick timing.

Drag options to blanks, or click blank then click option'

Asystem tick timing

Bresetting

Ccontext switching

Derror handling

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the roles of SysTick and PendSV.

Assuming PendSV handles timer interrupts.

SysTick is used for system tick timing, while PendSV is used for context switching.

4fill in blank

hard

Fill both blanks to complete the statement about exception priorities.

ARM Architecture

In ARM Cortex-M, the [1] exception usually has lower priority than the [2] exception.

Drag options to blanks, or click blank then click option'

APendSV

BSysTick

CHardFault

DNMI

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning PendSV higher priority than SysTick.

Confusing HardFault or NMI with these exceptions.

PendSV is typically assigned a lower priority than SysTick to allow SysTick interrupts to preempt PendSV.

5fill in blank

hard

Fill all three blanks to complete the dictionary literal that maps exception names to their typical uses.

ARM Architecture

exception_uses = {
    "SysTick": "[1]",
    "PendSV": "[2]",
    "HardFault": "[3]"
}

Drag options to blanks, or click blank then click option'

Asystem tick timer

Bcontext switching

Cerror handling

Dresetting

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up the uses of these exceptions.

Assigning resetting to HardFault instead of error handling.

SysTick is for system tick timer interrupts, PendSV for context switching, and HardFault for error handling.