Why I2C is used in Embedded C - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to initialize I2C communication.

Embedded C

I2C_Init([1]);

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

A100000

B115200

C9600

D4800

Attempts:

3 left

💡 Hint

Common Mistakes

Using UART baud rates instead of I2C clock speed.

The standard I2C clock speed is 100kHz, so 100000 is used to initialize I2C.

2fill in blank

medium

Complete the code to send data over I2C.

Embedded C

I2C_Start();
I2C_Write([1]);
I2C_Stop();

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

A9600

B0x50

C0xFF

D100000

Attempts:

3 left

💡 Hint

Common Mistakes

Using baud rates or clock speeds instead of device address.

0x50 is a common 7-bit I2C device address used to send data.

3fill in blank

hard

Fix the error in the I2C read function call.

Embedded C

uint8_t data = I2C_Read([1]);

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

A0

B2

C1

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 which stops reading prematurely.

Passing 1 means sending an ACK after reading to continue reading more bytes.

4fill in blank

hard

Fill both blanks to create a dictionary of device addresses and their names.

Embedded C

const char* devices = {
  [1]: "Sensor",
  [2]: "EEPROM"
};

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

A0x40

B0x50

C0x60

D0x70

Attempts:

3 left

💡 Hint

Common Mistakes

Using invalid or uncommon addresses.

0x40 and 0x50 are common I2C addresses for sensors and EEPROM devices respectively.

5fill in blank

hard

Fill all three blanks to complete the I2C communication sequence.

Embedded C

I2C_Start();
I2C_Write([1]);
uint8_t data = I2C_Read([2]);
I2C_Stop();
return [3];

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

A0x68

B1

Cdata

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Returning 0 instead of the read data.

Using wrong device address.

Start communication with device 0x68, read data with ACK (1), then return the data read.