Multi-channel ADC scanning in Embedded C - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Multi-channel ADC scanning?

It is a method where an Analog-to-Digital Converter (ADC) reads multiple input channels one after another automatically.

beginner

Why use Multi-channel ADC scanning in embedded systems?

It saves time and CPU effort by automatically switching between channels and collecting data without manual intervention.

intermediate

In embedded C, what is a common way to start multi-channel ADC scanning?

You configure the ADC to scan multiple channels and then start the conversion process, often using interrupts or DMA for efficiency.

intermediate

What role does DMA play in Multi-channel ADC scanning?

DMA (Direct Memory Access) transfers ADC results directly to memory without CPU involvement, speeding up data handling.

beginner

How do you know when all channels have been scanned in a multi-channel ADC setup?

Usually, an interrupt or a flag signals the end of scanning, indicating all channels have been converted.

What does Multi-channel ADC scanning do?

A Reads multiple analog inputs one after another automatically

B Reads only one analog input repeatedly

C Converts digital signals to analog

D Sends data to the CPU manually

Multi-channel ADC scanning automatically reads multiple analog inputs in sequence.

Which hardware feature helps transfer ADC data without CPU load?

A DMA

B UART

C Timer

D GPIO

DMA moves data directly between ADC and memory, reducing CPU work.

How does the system know when ADC scanning is complete?

A The ADC stops automatically without notification

B The CPU guesses the time

C An interrupt or flag signals completion

D User manually checks each channel

Interrupts or flags notify the CPU that scanning finished.

What is the main benefit of multi-channel scanning over single channel?

A Consumes more power

B Slows down data collection

C Requires manual channel selection

D Saves CPU time by automating channel switching

Multi-channel scanning automates reading multiple inputs, saving CPU effort.

Which programming language is commonly used for embedded ADC control?

A Python

B embedded C

C JavaScript

D HTML

Embedded C is widely used for low-level hardware control like ADC.

Explain how multi-channel ADC scanning works in an embedded system.

Think about how the ADC reads inputs one by one and tells the CPU when done.

Describe the advantages of using DMA with multi-channel ADC scanning.

DMA helps move data without bothering the CPU.