ADC conversion process (sample and hold) in Embedded C - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start the ADC conversion.

Embedded C

ADC_StartConversion([1]);

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

AADC_CHANNEL_0

BADC_CHANNEL_3

CADC_CHANNEL_2

DADC_CHANNEL_1

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong channel number

Forgetting to specify channel

The function ADC_StartConversion requires the channel number to start conversion. Here, channel 1 is used.

2fill in blank

medium

Complete the code to enable the ADC sample and hold feature.

Embedded C

ADC_ControlRegister |= [1];

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

AADC_CONVERSION_START

BADC_SAMPLE_ENABLE

CADC_SAMPLE_HOLD_ENABLE

DADC_INTERRUPT_ENABLE

Attempts:

3 left

💡 Hint

Common Mistakes

Enabling wrong bits

Confusing sample enable with sample and hold

To enable sample and hold, the ADC_SAMPLE_HOLD_ENABLE bit must be set in the control register.

3fill in blank

hard

Fix the error in the code to wait until ADC conversion is complete.

Embedded C

while (!(ADC_StatusRegister & [1])) {}

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

AADC_CONVERSION_COMPLETE_FLAG

BADC_SAMPLE_HOLD_FLAG

CADC_START_CONVERSION_FLAG

DADC_INTERRUPT_FLAG

Attempts:

3 left

💡 Hint

Common Mistakes

Waiting on wrong flag

Using sample hold flag instead of conversion complete

The loop waits until the conversion complete flag is set in the status register.

4fill in blank

hard

Complete the code to correctly read the ADC result and clear the conversion flag.

Embedded C

uint16_t result = ADC_ResultRegister;
ADC_StatusRegister &= ~[1];

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

BADC_CONVERSION_COMPLETE_FLAG

D0xFFFF

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to modify the result value

Not clearing the flag properly

The ADC result is read directly from the result register without modification. The conversion complete flag is cleared by ANDing with its complement.

5fill in blank

hard

Fill all three blanks to configure ADC for sample and hold with 10-bit resolution and start conversion.

Embedded C

ADC_ControlRegister = [1] | [2];
ADC_StartConversion([3]);

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

AADC_SAMPLE_HOLD_ENABLE

BADC_RESOLUTION_10BIT

CADC_CHANNEL_2

DADC_CHANNEL_0

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong resolution bits

Starting conversion on wrong channel

The control register is set to enable sample and hold and 10-bit resolution. Then conversion starts on channel 2.