GPIO register configuration in Embedded C - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the GPIO pin 5 as output.

Embedded C

GPIO_DIR |= (1 << [1]);

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

A1

B3

C7

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong pin number in the shift operation.

Forgetting to use the bitwise OR operator.

Pin 5 is set as output by shifting 1 left by 5 positions.

2fill in blank

medium

Complete the code to clear GPIO pin 2 output.

Embedded C

GPIO_DATA &= ~([1] << 2);

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

A0

B2

C1

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong value to shift.

Not using the bitwise NOT operator.

To clear pin 2, shift 1 by 2 and invert the bits to clear that bit.

3fill in blank

hard

Fix the error in setting GPIO pin 4 high.

Embedded C

GPIO_DATA [1] (1 << 4);

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

A&=

B|=

C^=

D=

Attempts:

3 left

💡 Hint

Common Mistakes

Using &= which clears bits instead of setting.

Using = which overwrites the entire register.

Use bitwise OR assignment (|=) to set pin 4 high without affecting other pins.

4fill in blank

hard

Fill both blanks to configure pin 3 as input and enable pull-up resistor.

Embedded C

GPIO_DIR [1]= ~(1 << 3);
GPIO_PUR [2]= (1 << 3);

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

A&

B|

C~

D^

Attempts:

3 left

💡 Hint

Common Mistakes

Using |= to set direction bit instead of clearing it.

Not enabling pull-up resistor correctly.

Use &= with inverted mask to clear pin 3 direction (input), and |= to enable pull-up resistor.

5fill in blank

hard

Fill all three blanks to toggle pin 6 output safely.

Embedded C

if (GPIO_DATA & (1 << [1])) {
    GPIO_DATA [2]= ~(1 << [3]);
} else {
    GPIO_DATA |= (1 << 6);
}

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

A6

B&=

C~

D|=

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong pin number in the mask.

Using |= instead of &= to clear the bit.

Check pin 6 status, clear it with &= ~mask if set, else set it with |=.