Writing data to I2C device in Embedded C - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start an I2C transmission to device address 0x50.

Embedded C

I2C_Start();
I2C_Write([1]);

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A0x50 << 1

B0x50

C0xA0

D0x28

Attempts:

3 left

💡 Hint

Common Mistakes

Using the device address without shifting left.

Using the read address instead of write address.

The device address must be shifted left by 1 bit to make room for the read/write bit in I2C communication.

2fill in blank

medium

Complete the code to write the data byte 0x3F to the I2C device.

Embedded C

I2C_Write([1]);

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A0x3F

B0xA1

C0x50

D0x00

Attempts:

3 left

💡 Hint

Common Mistakes

Sending the device address instead of data.

Sending a wrong data byte.

0x3F is the data byte we want to send to the device.

3fill in blank

hard

Fix the error in the code to properly stop the I2C transmission.

Embedded C

I2C_Stop[1];

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A{}

B;

C[]

D()

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting parentheses when calling functions.

Using incorrect punctuation after function names.

I2C_Stop is a function and must be called with parentheses.

4fill in blank

hard

Fill all three blanks to write a byte 0x7A to register 0x10 of the I2C device at address 0x60.

Embedded C

I2C_Start();
I2C_Write([1]);
I2C_Write([2]);
I2C_Write([3]);

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A0x60 << 1

B0x7A

C0x10

D0x50

Attempts:

3 left

💡 Hint

Common Mistakes

Sending data byte before register address.

Not shifting the device address left.

First, send the device address shifted left for writing, then send the register address, then the data byte 0x7A.

5fill in blank

hard

Fill all three blanks to complete the function that writes a data byte to a register of an I2C device.

Embedded C

void writeRegister(uint8_t deviceAddr, uint8_t regAddr, uint8_t data) {
    I2C_Start();
    I2C_Write([1]);
    I2C_Write([2]);
    I2C_Write([3]);
    I2C_Stop();
}

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

AdeviceAddr << 1

BregAddr

Cdata

DdeviceAddr

Attempts:

3 left

💡 Hint

Common Mistakes

Not shifting the device address.

Swapping register and data bytes.

The function sends the device address shifted left, then the register address, then the data byte.