Peripheral-to-memory transfer in Embedded C - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is peripheral-to-memory transfer in embedded systems?

It is the process of moving data directly from a hardware peripheral (like a sensor or communication interface) into the system's memory without CPU intervention, often using DMA (Direct Memory Access).

beginner

Why is using DMA for peripheral-to-memory transfer beneficial?

DMA allows data to be transferred directly between peripherals and memory, freeing the CPU to perform other tasks and improving system efficiency and speed.

intermediate

Which components are involved in a peripheral-to-memory transfer using DMA?

The peripheral device, the DMA controller, and the system memory are involved. The DMA controller manages the data movement without CPU intervention.

intermediate

What is a common step before starting a peripheral-to-memory DMA transfer?

Configuring the DMA controller with source address (peripheral), destination address (memory), transfer size, and enabling the DMA channel.

intermediate

How does the CPU know when a peripheral-to-memory transfer is complete?

The DMA controller usually triggers an interrupt to the CPU when the transfer finishes, allowing the CPU to process the received data.

What does DMA stand for in embedded systems?

A Direct Memory Access

B Data Memory Allocation

C Dynamic Memory Access

D Device Memory Adapter

DMA stands for Direct Memory Access, which allows peripherals to transfer data directly to memory.

Which component controls the data transfer in peripheral-to-memory DMA?

A CPU

B DMA controller

C Peripheral device

D Memory controller

The DMA controller manages the data transfer between peripheral and memory without CPU involvement.

What is the main advantage of using peripheral-to-memory DMA transfer?

A Slower data transfer

B More CPU interrupts

C CPU is free for other tasks

D Increased power consumption

DMA frees the CPU by handling data transfer independently, allowing the CPU to do other work.

Before starting a DMA transfer, what must be configured?

A Memory cache settings

B CPU clock speed

C Peripheral power mode

D DMA source, destination, and size

DMA requires configuration of source address, destination address, and transfer size before starting.

How does the system know when a DMA transfer is done?

A DMA controller triggers an interrupt

B Memory sends a notification

C CPU polls the peripheral

D Peripheral sends a signal

The DMA controller usually sends an interrupt to notify the CPU that the transfer is complete.

Explain the process of peripheral-to-memory transfer using DMA in embedded systems.

Think about how data moves without the CPU doing the copying.

List the key steps to set up a peripheral-to-memory DMA transfer.

Focus on what the DMA controller needs to know before starting.