Polling technique in embedded system

Polling basically means that the embedded system will check all status for each device at set intervals, which is called a polling cycle. For example, the embedded system may check the state of a switch every 5 ms, and detect any obstacles every 20 ms, and read the room temperature every 5 sec.

1. What is polling method in microcontroller?
2. What are the main advantages of polling and when it is preferable than interrupts?
3. Which is better polling or Interrupt?
4. How is polling achieved in Interrupt?
5. What is polling in chemistry?
6. What is the difference between polling and vectored interrupt?
7. What is polling used for what are the disadvantages of polling?
8. When polling method is preferable?
9. When might polling be more efficient than interrupts?
10. What is peripheral polling?
11. How does polling driven I/O differ from interrupts driven I O?
12. What is polling in API?
13. What is polling in web development?
14. What is roll call polling?
15. What is polling in refining of metals?
16. What is zone refining used for?
17. What is difference between calcination and roasting?

What is polling method in microcontroller?

In polling, the microcontroller continuously monitors the status of a given device and executes the task the device needed when the status will satisfy the condition. ... After that, it moves on to monitor the next device until each one is served.

What are the main advantages of polling and when it is preferable than interrupts?

Some of the advantages of polling are the relatively simple program, transmission reliability that takes place at maximum speed, i.e. as soon as the I/O device is ready and the no need of additional access chips. Interruption is beneficial because it can serves multiple devices, it is more flexible and efficient.

Which is better polling or Interrupt?

Advantages of Interrupt over Polling. The first advantage is- the performance of microcontroller is far better in Interrupt method than Polling Method. In polling method, the microcontroller is checking continuously whether the device is ready or not, but the chances of data loss are greater in Polling than Interrupt.

How is polling achieved in Interrupt?

In interrupt, the device notices the CPU that it requires its attention. Whereas, in polling, CPU steadily checks whether the device needs attention.

What is polling in chemistry?

Polling is used for the purification of copper or tin which contains oxide impurities. The impure metal is melted and stirred with green logs of wood. The heat of molten metal makes the green logs to liberate hydrocarbon gases which in turn reduce the metal oxide into metal.

What is the difference between polling and vectored interrupt?

polled interrupt defined as if the hardware devices send data without identification and vectored (daisy) interrupt is defined as if the hardware devices send data with the hardware information.

What is polling used for what are the disadvantages of polling?

Time is wasted during polling. Link sharing is not fair since each station has the equal probability of winning in each round. Few stations might starve for sending the data.

When polling method is preferable?

Basically, polled mode is used in case interrupt mode is unavailable due to some hardware or software reasons. So, interrupt mode is more preferable from power consumption, performance, etc points of view (agree with Paul R).

When might polling be more efficient than interrupts?

13.3 Why might a system use interrupt-driven I/O to manage a single serial port and polling I/O to manage a front-end processor, such as a terminal concentrator? Answer: Polling can be more efficient than interrupt-driven I/O. This is the case when the I/O is frequent and of short duration.

What is peripheral polling?

(1) A communications technique that determines when a terminal is ready to send data. ... (2) A technique that continually interrogates a peripheral device to see if it has data to transfer.

How does polling driven I/O differ from interrupts driven I O?

Polled (or programmed) I/O: The CPU periodically manually checks if there are any I/O requests available. If there isn't, it keeps executing its normal workflow. If there is, it handles the I/O request instead. Interrupt-Driven I/O: The CPU doesn't need to manually check for I/O requests.

What is polling in API?

APIs commonly require a client to send a request to the server to receive new data; that is, the page requests data from the server. ... This pattern is known as polling and is a common solution for clients that need to become aware of new data or notified of backend events.

What is polling in web development?

Polling is a technique by which the client asking the server for new data regularly. ... In simple terms, Short polling is an AJAX-based timer that calls at fixed delays whereas Long polling is based on Comet (i.e server will send data to the client when the server event happens with no delay).

What is roll call polling?

Roll call votes occur when a representative or senator votes "yea" or "nay," so that the names of members voting on each side are recorded. A voice vote is a vote in which those in favor or against a measure say "yea" or "nay," respectively, without the names or tallies of members voting on each side being recorded.

What is polling in refining of metals?

The impure metal, usually in the form of molten blister copper, is placed in an anode furnace for two stages of refining. ... The heat of the copper makes the pole emit wood gas(CO₂ and H₂) that reduces the cuprous oxide to copper. It was the use of these greenwood poles gave rise to the term "poling."

What is zone refining used for?

-Zone refining process is used for the purification of metal. -Metals are purified through this process to a very high degree. The other name of zone refining is called fractional crystallization. -Ultra-pure samples of metals like germanium, silicon, boron, and gallium are obtained through this process.

What is difference between calcination and roasting?

Calcination is a process where the air might be supplied in limited quantity, or the ore is heated in the absence of air. Roasting includes heating of ore lower than its melting point in the presence of oxygen or air.