![]() ![]() ![]() TIMSK1 |= (1 << OCIE1A) // enable timer compare interruptĬan't get the timer to work. The mode 1 bit stream is simulated by the 1.8ms delay. I'm turning the timer on and off using the TIMSK1 register, but with no success.ġ6000-1 counts with no prescaling should give 1ms. How can I force the ISR to execute only once? Because for low duty cycle values, it'll repeat over the 2.5ms period.īelow is the simplified code of what I'm doing. Without knowing what is connected to your Uno, it is impossible to debug that program. The Input Capture mode of Timer1, used to time external events, has nothing to do with the external interrupts INT0 and INT1. I know I could just use an external interrupt controlled by a comparator. I have a robot that drives pretty fast but also needs to sense objects and control a servo if a threshold is met. ![]() I thought of doing it using a timer interrupt - that is, whenever I enter mode 2, pin10 is pulled high, the timer interrupt is enabled, it counts until the duty cycle is met, and when it enters the ISR() function, I pull pin 10 low. The ATmega is a mature product, so be assured that ALL the interrupts mentioned in the data sheet work as advertised, if used properly. I am trying to get an interrupt timer to work so that I can multitask. The problem is that, while in mode 2, I want pin 10 to output a variable duty cycle pulse (of period 2.5ms), defined by some variable. Hi, Im trying to set timer3 on a Arduino Micro but my interrupt isnt being called at the frequency Im attempting to set it to (40Hz or 25ms period). Mode 2, it reads a char value from a BLE daughter board. markecsmith September 14, 2017, 3:35pm 1.Mode 1, it outputs a bit stream, which lasts approximately 1.8ms.So, every 2.5ms pin 10 does different things. Here's the thing: I have an external clock (at 200Hz) connected to pin 2, and using a hardware interrupt, and changing between two "operation modes" whenever the external clock changes. I have messing around with timer interrupts on my UNO boards, but it appears I've hit a wall. ![]()
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