Why GPIO is the foundation of embedded in Embedded C - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set a GPIO pin as output.

Embedded C

GPIO_InitTypeDef GPIO_InitStruct = {0};
GPIO_InitStruct.Pin = GPIO_PIN_5;
GPIO_InitStruct.Mode = [1];
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

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AGPIO_MODE_OUTPUT_PP

BGPIO_MODE_INPUT

CGPIO_MODE_ANALOG

DGPIO_MODE_IT_RISING

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing input mode instead of output mode.

To set a GPIO pin as output, you use GPIO_MODE_OUTPUT_PP which means push-pull output mode.

2fill in blank

medium

Complete the code to read the state of a GPIO pin.

Embedded C

int pin_state = HAL_GPIO_ReadPin(GPIOB, [1]);

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AGPIO_PIN_3

BGPIO_PIN_0

CGPIO_PIN_12

DGPIO_PIN_7

Attempts:

3 left

💡 Hint

Common Mistakes

Using a pin number not defined or not connected.

We read the state of pin 7 on port B using GPIO_PIN_7.

3fill in blank

hard

Fix the error in the code to toggle a GPIO pin.

Embedded C

HAL_GPIO_TogglePin(GPIOC, [1]);

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AGPIO_PIN_13

BGPIO_PIN_8

CGPIO_PIN_5

DGPIO_PIN_0

Attempts:

3 left

💡 Hint

Common Mistakes

Using a pin that is not configured as output.

Pin 13 on port C is commonly used for toggling an LED on many boards.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps pin numbers to their states if the pin state is high.

Embedded C

pin_states = {pin: HAL_GPIO_ReadPin(GPIOA, pin) for pin in pins if HAL_GPIO_ReadPin(GPIOA, pin) [1] [2]

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A==

BGPIO_PIN_5

CGPIO_PIN_SET

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong comparison operator or wrong pin state constant.

The condition checks if the pin state is equal to GPIO_PIN_SET, which means the pin is high.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps pin names in uppercase to their states if the state is low.

Embedded C

pin_status = { [1]: HAL_GPIO_ReadPin(GPIOB, [2]) for [3] in pins if HAL_GPIO_ReadPin(GPIOB, pin) == GPIO_PIN_RESET }

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Apin.upper()

Bpin

Dpin_name

Attempts:

3 left

💡 Hint

Common Mistakes

Using inconsistent variable names or wrong key formatting.

The dictionary keys are the uppercase pin names, values are the pin states, and the loop variable is pin.