Setting breakpoints in embedded in Embedded C - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set a breakpoint using the debugger keyword.

Embedded C

void main() {
    int x = 5;
    [1];
    x = x + 1;
}

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

A__asm__("int3")

Bbreakpoint()

Cdebugger

Dbreak

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'break' keyword which is for loops or switches, not breakpoints.

Using 'debugger' which is a JavaScript keyword, not C.

In embedded C, setting a breakpoint can be done using an assembly instruction like int3 which triggers a breakpoint interrupt.

2fill in blank

medium

Complete the code to declare a volatile variable to help with debugging.

Embedded C

volatile int [1] = 0;

void main() {
    while(1) {
        [1]++;
    }
}

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

Aflag

Btemp

Cdebug_var

Dcounter

Attempts:

3 left

💡 Hint

Common Mistakes

Using variable names that are too generic or unrelated to counting.

Not declaring the variable as volatile.

Declaring a variable as volatile tells the compiler not to optimize it away, which is useful for debugging.

3fill in blank

hard

Fix the error in the code to correctly trigger a breakpoint using inline assembly.

Embedded C

void trigger_breakpoint() {
    __asm__ [1];
}

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

A("halt")

B("int3")

C("trap")

D("break")

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect assembly instructions like 'break' or 'halt'.

Missing parentheses or quotes around the assembly instruction.

The correct inline assembly syntax to trigger a breakpoint interrupt is __asm__("int3").

4fill in blank

hard

Complete the code to create a macro that triggers a breakpoint.

Embedded C

#define BREAKPOINT() __asm__ [1] ;

void main() {
    BREAKPOINT();
}

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

A("int3")

B("trap")

C;

D:

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong assembly instructions or missing the semicolon.

Using colon instead of semicolon at the end.

The macro uses __asm__("int3"); to trigger a breakpoint with proper syntax.

5fill in blank

hard

Fill all three blanks to write a function that sets a breakpoint and increments a volatile counter.

Embedded C

volatile int [1] = 0;

void set_breakpoint() {
    __asm__[2];
    [3]++;
}

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

Adebug_counter

B("int3")

D("break")

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names in declaration and increment.

Using wrong assembly instructions.

The function uses a volatile variable named debug_counter and triggers a breakpoint with __asm__("int3");.