![]() When it reaches the target value it sets a flag and goes back to 0. It is counting up from 0 to some value over and over again incrementing at a set frequency. On another part of the chip there is this thing called a timer. ![]() It does this in the same order each time. The idea is this - the ATmega CPU is sitting there executing your code, pulling commands off of the stack. The best of which is the ATmega datasheet. I am not going to go into great detail on the specifics of timer interrupts because there are other sources out there. They are really pretty easy to use but are very powerful. ![]() I have always been a bit surprised that Arduino does not break timer interrupts out a little. ![]() It is not something that is provided by Arduino, and in fact functions such as millis() and delay() are based on them. The timer interrupt is a low level feature of the ATmega family. The problem with that is that it is dependent on the speed with which the loop runs. 1) They use some library that does all this for them (I don't know if one exists, but maybe it does) or 2) They just throw a digitalWrite in the loop() and pulse it that way. Most people when they first get going with steppers probably do one of two things. One rising edge equals one step (or micro step, depending on how the set pins are wired). A pololu style stepper driver (the kind that plugs into the RAMPS board) only requires two inputs from the Arduino. This method is non blocking, efficient, and as far as I know is pretty much what most 3D printer firmwares use. The UI event handlers themselves do no "busy" work to ensure both the responsiveness of the UI and real-time control of the motor.This tutorial will show how to drive a Pololu style stepper (A4988) driver using a timer interrupt. So that now you have a single non-blocking loop where the actions in each iteration depend on the state information set by the UI event handlers. Smd.Run_Unlimited( SmartDrive_Motor_ID_1, The real-time behaviour and responsiveness to external events will then be more deterministic. Instread you should us eretained state information to determine what should happen for each loop() iteration. In the Arduino Sketch setup()/ loop() framework it is ill advised to have "busy-loops" withing loop(). It is possible to implement void setup() and void loop() and it was done. Smd.Run_Unlimited(SmartDrive_Motor_ID_1, SmartDrive_Dir_Forward, 90) Īs the First photo below, it is not possible to implement void loop in this case. Smd.StopMotor(SmartDrive_Motor_ID_1, SmartDrive_Action_Brake) SmartDrive smd = SmartDrive(SmartDrive_DefaultAddress) New ui_events.cpp File with issue: #include Have any tips on how to resolve this? Would I have to use interrupt? Would I have to use another task? How to Smd.Run_Unlimited(SmartDrive_Motor_ID_1, SmartDrive_Dir_Reverse, 90) Īt that moment my issue enters because I am not able to stop the motor through the code below. Or else the motor stops by itself in 5sīut, when I want the motor to run for more than 5 seconds I need to put this routine: Motor before that time, I click the stop button it works ok. The lib SmartDrive Makes the motor run for 5 seconds (by default). I have this code running in STM32F469 DISCO KIT:
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