Baud rate configuration in Embedded C - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the baud rate register to 9600 baud assuming F_CPU is 16MHz.

Embedded C

UBRR0H = ([1] >> 8);

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A51

B207

C103

D16

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong UBRR value for 9600 baud at 16MHz.

The value 103 sets the baud rate to 9600 for 16MHz clock using the formula: UBRR = (F_CPU / (16 * Baud)) - 1.

2fill in blank

medium

Complete the code to enable the transmitter in the UART control register.

Embedded C

UCSR0B = (1 << [1]);

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ARXEN0

BTXCIE0

CRXCIE0

DTXEN0

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing receiver enable (RXEN0) with transmitter enable.

TXEN0 bit enables the UART transmitter.

3fill in blank

hard

Fix the error in the code to set the baud rate low byte correctly.

Embedded C

UBRR0L = [1] & 0xFF;

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AUBRR0L

BUBRR_VALUE

CUBRR0H

DUBRR

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong register or variable for the low byte.

The low byte of the baud rate register should be set to the lower 8 bits of the calculated UBRR_VALUE.

4fill in blank

hard

Fill both blanks to configure UART for 8 data bits and no parity.

Embedded C

UCSR0C = (1 << [1]) | (1 << [2]);

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AUCSZ01

BUCSZ02

CUCSZ00

DUPM01

Attempts:

3 left

💡 Hint

Common Mistakes

Setting parity bits instead of data size bits.

Setting UCSZ01 and UCSZ00 bits configures 8 data bits. No parity bits are set.

5fill in blank

hard

Fill all three blanks to calculate and set the baud rate registers correctly.

Embedded C

uint16_t [1] = (F_CPU / (16 * [2])) - 1;
UBRR0H = ([1] >> 8);
UBRR0L = [1] & 0xFF;

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Aubrr_value

Bbaud_rate

Dbaud

Attempts:

3 left

💡 Hint

Common Mistakes

Using inconsistent variable names for baud rate and UBRR value.

The variable 'ubrr_value' stores the calculated baud rate register value. 'baud' is the desired baud rate.