#Arduino timer interrupt driven loop serial#You have no control over the interrupt routine of the serial communication in the Serial library, but at least your own interrupt function should be as short as possible. Things run smooth when all interrupt routines are as short and as fast as possible. Interrupts are executed one after another (with a few exceptions). If the problem was somewhere else, then perhaps you could find the problem yourself. When you say that something is working for sure, then there is a big chance that the problem is in that part. #Arduino timer interrupt driven loop code#I paste code of whole program, as you asked me for: I tried to declare variables as volatile but it didn't solve the problem.Īnyone did have any experience with such problems? Change is only adding serial transmission. I don't change anything since good working program version. I don't give whole code for "Myfunction" because this function works properly, for sure. #Arduino timer interrupt driven loop Pc#I can see correct values of those variables on LCD (exactly what I send from PC to arduino) but they don't get to Myfunction (function which is executed within timer interrupt) so actually they are 0 continually. problem appears when I don't set value at the beginning (just declare likes above) and try to set it via serial port the situation is following: The main thing is that when I set values of variables: float Kr, Ti, Td at the beginning of program, in declaration section (not by serial port) it works perfectly. When it gets from PC proper char sign it sends datas or receives datas. Simple displaying some of variables values Td_str = Serial.readStringUntil(' ') //uC receives datas from PC Ti_str = Serial.readStringUntil(' ') //uC receives datas from PC Kr_str = Serial.readStringUntil(' ') //uC receives datas from PC Yref_str = Serial.readStringUntil(' ') //uC receives datas from PC Serial.print(y) // Here uC transmits to PC My question is generally about influancing uart transmision and timer interrupts each other, but I paste part of my code to better discribing my issue: float Kr I have also a LCD for simple debugging state of variables. It transmits and receives as well and received values are computed in timer interrupt and then transmitted to PC. I'm doing program which communicates with PC. As you may not know exactly what else is going on in the background.I have a small problem with collision between handling serial transmission and executing things in timer interrupt. The moral of the story is stop and start things specifically. In that only the Timer Interrupt is stopped, allowing the Serial Interrupt and others to continue on. Where as you mentioned changing the above code to the following fixes the issue. Speed the baud rate up to 115200 and you get the whole 100. Note that the "10" you initially got at the end is first two digits of the 100. Hence noInterrupts() just after a Serial.print immediately stops all interrupts leaving it no time to begin the transmitter interrupts. The Serial.print fills a buffer and then enables the transmitter empty interrupt, so that it will send each char in the background, per interrupt as your code moves on. You are using the Hardware Serial, which in turn uses interrupts for transmitting.
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