Both functions are identical in terms of generating delay. If the reference documentation of Arduino is considered then there is two type of delay functions, the first one is delay() and second is delayMicroseconds(). But before starting let's discuss that why we should not use delay() function in any project. Arduino also has a delay() function which is used widely. Since the Arduino runs in low frequency and RAM compare to Laptop/Mobile/PC so the time given to each task will also be different. The concept will be almost same for the Arduino Multitasking, except the time distribution will be a bit different. This is how the multitasking is done in most of the systems. Let’s discuss how OS manages multitasking.Īs seen in the picture, the CPU divides the time in the three equal parts and assign each part to each task/application. The end user use all these applications at the same time but OS takes this concept a bit different. The good example of multitasking in computers are when users run the email application, internet browser, media player, games, at the same time and if users don’t want use the application it runs in the background if not closed. The MOS can be mobile or desktop PC Operating System. This kind of operating systems are known as MOS (multitasking operating system). Almost all operating systems feature multitasking. Multitasking simply means executing more than one task or program simultaneously at the same time. Before going into detail let’s start with understating Multitasking. So this article explains how we can avoid use of delay() function and replace it with millis() to perform more than one tasks simultaneously and make the Arduino a Multitasking controller. Here in this tutorial we will learn How Arduino performs Multitasking with Arduino millis function. Generally a delay() function is used in Arduino for a periodic task like LED Blinking but this delay() function halt the program for some definitive time and don’t allow other operations to perform. In embedded systems, microcontrollers can also handle Multitasking and performs two or more tasks simultaneously without halting the current instructions. I am having fun so far, it got me reading the datasheet of the Uno, not whole of it but at least some, and going down the line of learning bare metal, it was implied it would also build some knowledge to be used when I will use other microcontrollers.The multitasking has led the computers to a revolution where one or more programs can run simultaneously which increases efficiency, flexibility, adaptability and productivity. Here is the code,ġ //Inner semicolon is pointer and outer dereference the pointer to access valueģ #define REGDIRB (*(volatile byte*) 0x24)Ħ //32 or bit 5 because in 8-bit, 128 64 32 16 8 4 2 1ħ REGDIRB = 32 //00100000 Sets Port 5 bit 5 as output by setting it to HIGHġ1 //Setting Port B, bit 5 to high gets it to turn on/high, low is off/lowġ2 for (long i = 0 i < 1000000 i++) So I'd like to know how much of a time delay is that. So I have tried to dip my head into bare metal Arduino, I have been following this tutorial, he re-wrote the delay function as a for loop with i < 1,000,000 (CODE LINE 12-13).īut I do not know how much time is that as compared to just writing the time in terms of milliseconds in the usual delay().
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