Why embedded debugging is different in Embedded C - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to initialize the microcontroller's UART for debugging output.

Embedded C

UART_Init([1]);

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

A9600

B115200

C4800

D19200

Attempts:

3 left

💡 Hint

Common Mistakes

Using a very low baud rate slows down debugging output.

Choosing a non-standard baud rate may cause communication errors.

The baud rate 115200 is commonly used for fast and reliable UART debugging communication.

2fill in blank

medium

Complete the code to turn on an LED connected to pin 13 for debugging purposes.

Embedded C

GPIO_WritePin(13, [1]);

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

AHIGH

BLOW

CTOGGLE

DINPUT

Attempts:

3 left

💡 Hint

Common Mistakes

Using LOW turns the LED off instead of on.

Using TOGGLE is not a valid argument for this function.

Setting the pin to HIGH turns the LED on, which is useful for visual debugging.

3fill in blank

hard

Fix the error in the interrupt service routine declaration for debugging.

Embedded C

void [1] ISR_Handler(void) { /* handle interrupt */ }

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

A__interrupt

B__isr

CISR

Dinterrupt

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'interrupt' without underscores may cause syntax errors.

Using 'ISR' or '__isr' may not be recognized by the compiler.

The '__interrupt' keyword is used in embedded C to declare an interrupt service routine.

4fill in blank

hard

Fill both blanks to create a dictionary-like structure mapping error codes to messages for debugging.

Embedded C

const char* error_messages[] = { [[1]] = "Overrun", [[2]] = "Timeout" };

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

A1

B0

C2

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using indices out of order or invalid indices.

Confusing error codes with message strings.

Error code 0 maps to "Overrun" and error code 2 maps to "Timeout" in this array initialization.

5fill in blank

hard

Fill all three blanks to implement a simple debug log function that prints a message only if debugging is enabled.

Embedded C

void debug_log(const char* msg) {
    if ([1]) {
        [2](msg);
        [3]();
    }
}

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

ADEBUG_ENABLED

Bprintf

Cfflush

DDEBUG_MODE

Attempts:

3 left

💡 Hint

Common Mistakes

Using undefined flags like DEBUG_ENABLED instead of DEBUG_MODE.

Forgetting to flush output, causing delayed prints.

The function checks if DEBUG_MODE is true, then prints the message with printf and flushes the output buffer with fflush.