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| en:iot-open:introductiontoembeddedprogramming2:cppfundamentals:timing [2024/05/27 10:51] – ktokarz | en:iot-open:introductiontoembeddedprogramming2:cppfundamentals:timing [2024/05/27 10:51] (current) – ktokarz |
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| The ''millis()'' (( https://www.arduino.cc/reference/en/language/functions/time/millis/)) returns the number in milliseconds since MCU began running the current program. Note it has nothing to do with a real-time clock, as most microcontrollers and development boards do not have one. The readings are 32-bit and will roll over in approximately 49 days. ''millis()'' can be used to replace ''delay()'' but needs some additional coding. Instead of blocking the algorithm, one can check if the desired time has passed. Meanwhile, it is possible to handle other tasks instead of blocking execution, as presented in the algorithm in figure {{ref>timers2}}. | The ''millis()'' (( https://www.arduino.cc/reference/en/language/functions/time/millis/)) returns the number in milliseconds since MCU began running the current program. Note it has nothing to do with a real-time clock, as most microcontrollers and development boards do not have one. The readings are 32-bit and will roll over in approximately 49 days. ''millis()'' can be used to replace ''delay()'' but needs some additional coding. Instead of blocking the algorithm, one can check if the desired time has passed. Meanwhile, it is possible to handle other tasks instead of blocking execution, as presented in the algorithm in figure {{ref>timers2}}. |
| <figure timers2> | <figure timers2> |
| {{ :en:iot-open:introductiontoembeddedprogramming2:cppfundamentals:timing-page-2.drawio.png?300 | Non-blocking call: use of the millis}} | {{ :en:iot-open:introductiontoembeddedprogramming2:cppfundamentals:timing-page-2.drawio.png?350 | Non-blocking call: use of the millis}} |
| <caption>Non-blocking call: use of the millis()</caption> | <caption>Non-blocking call: use of the millis()</caption> |
| </figure> | </figure> |
