Transmitting a byte over UART in Embedded C - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to send a byte using UART.

Embedded C

void UART_SendByte(char data) {
    while (!(UART_STATUS & [1]));
    UART_DATA = data;
}

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

AUART_TX_READY

BUART_OVERRUN

CUART_ERROR

DUART_RX_READY

Attempts:

3 left

💡 Hint

Common Mistakes

Using the receiver ready flag instead of transmitter ready.

Checking for error flags instead of readiness.

The UART_TX_READY flag indicates the transmitter is ready to send data.

2fill in blank

medium

Complete the code to wait until UART is ready before sending.

Embedded C

void UART_SendByte(char data) {
    while ((UART_STATUS & [1]) == 0);
    UART_DATA = data;
}

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AUART_RX_READY

BUART_PARITY_ERROR

CUART_TX_READY

DUART_FRAME_ERROR

Attempts:

3 left

💡 Hint

Common Mistakes

Checking the wrong UART status flag.

Using equality instead of bitwise AND.

Waiting for UART_TX_READY flag ensures the transmitter is ready before sending.

3fill in blank

hard

Fix the error in the UART byte transmission code.

Embedded C

void UART_SendByte(char data) {
    while (UART_STATUS & [1]);
    UART_DATA = data;
}

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

AUART_ERROR

BUART_TX_BUSY

CUART_RX_READY

DUART_TX_READY

Attempts:

3 left

💡 Hint

Common Mistakes

Waiting for the ready flag instead of the busy flag.

Using receiver flags instead of transmitter flags.

Waiting while UART_TX_BUSY is set ensures the transmitter is free before sending.

4fill in blank

hard

Fill both blanks to create a UART send function that waits for transmitter ready and then sends data.

Embedded C

void UART_SendByte(char data) {
    while (!(UART_STATUS & [1]));
    UART_DATA = [2];
}

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

AUART_TX_READY

Bdata

CUART_RX_READY

DUART_ERROR

Attempts:

3 left

💡 Hint

Common Mistakes

Using receiver ready flag instead of transmitter ready.

Assigning the wrong variable to UART_DATA.

Wait for UART_TX_READY flag and then assign the data variable to UART_DATA register.

5fill in blank

hard

Fill all three blanks to implement UART byte transmission with a busy wait and data assignment.

Embedded C

void UART_SendByte(char data) {
    while (UART_STATUS & [1]);
    UART_DATA = [2];
    UART_STATUS |= [3];
}

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

AUART_TX_BUSY

Bdata

CUART_TX_READY

DUART_TX_INTERRUPT_FLAG

Attempts:

3 left

💡 Hint

Common Mistakes

Not waiting for the busy flag before sending.

Not clearing the interrupt flag after transmission.

Wait while UART_TX_BUSY is set, assign data, then clear the interrupt flag by setting UART_TX_INTERRUPT_FLAG.