![]() Yes, its likely there are bugs in RTM_TimerCalc. The good news is you are warned and forced to use only legal slider settings (in version 1.20). If the divide-N value is less that 180, we'll get Phase-Shift step sizes greater than 1 degree. Mathematically speaking, we must realize a counter divide-N value below 100 will result in Duty-Cycle step sizes greater than 1%. In the first version, Duty-Cycle was not predictable using the interactive WYSIWYG display! But in version 1.20, the WYSIWYG sliders adapt to the limited step-size for PWM or Phase Shifted square waves. Version 1.20 and later gives you fair warning about low PWM resolution and low Phase resolution in mode-12 CTC.įor example, if I ask for a 4-MHz frequency in Fast-PWM, I lose a lot of PWM resolution. One not-so-obvious problem is when a counter divide-N value is below 100, you no longer have a Duty-Cycle resolution of 1 percent or better! The first release did not address this failing. ![]() ![]() Check the Frequency and Interval outputs at the bottom of the Waveform Display. If you hear no bleeps and see no warnings, you're good. And its up to you to edit that 1000 Hz value to whatever you need. Its easy to click a dropdown to change from Hz to mSec (frequency or time interval). You start off with a default frequency of 1000Hz. You may need a 16-bit Timer if using an 8-bit at time of message. There are limits on what the hardware can do. Read the Report-Window and consider accordingly. And sometimes desired output is far away from what you requested. Sometimes your Arduino PWM parameters can NOT be made to work. You may need to change to a different Timer or use a different frequency - it happens. Be sure you check the Report-Window for hints about what's going wrong. If you made a mistake, you'll hear a bleeping sound. Edit a new Frequency or Time-Interval and press Calculate - you're quickly ready to copy-paste to your IDE. Click the Calculate button and you'll see the resulting code. prompts you quickly thru the easy steps of choosing Clock, Timer and Waveform mode. This is true for pins on Nano, Uno and Mega2560 - across Timers 1 thru 5. You won't need to dive into a datasheet to work out what pin# needs to be set up as OUTPUT. It adds comment-info identifying what PWM channel (a, b or c) is associated with which pin. RTM_TimerCalc generates PinMode code for each output waveform you choose. That adds up to 2 (8-bit) and 3 (16-bit) Modes - across a selection of 5 possible Timers. And you get one CTC mode for the 16 bit Timers. You'll get adjustable frequency Phase and Fast PWM for both 8 and 16 bit Timers. RTM_TimerCalc uses a small subset of the many Timer Modes available. Only the Overflow type Interrupt is included in RTM_TimerCalc output for now. You'll likely place this ISR code after any #includes but ahead of Setup(). If you don't already have that call coded in your Sketch, it's a handy reference for copy and paste. Included as a comment to the right of your Interrupt code-line, is a C++ Prototype of the vectored ISR your interrupt will call. An Overflow-Interrupt fires each time your Timer reaches its TOP count (or 1 clock after). A line of Interrupt code is created for any of 5 Timer choices. No problem - just check the Include-Interrupt checkbox and hit Calculate. Instead you need a precisely timed Interrupt to synchronize your code. Sometimes you don't care about waveforms. Place your scope probes on the port pins to see your desired waveforms humming along at the Frequency, Period and Duty cycle you dialed up. Copy-paste the code to your Sketch, Upload and your Arduino PWM is ready to run! In just moments, you can dial up a desired pattern and watch as Arduino compatible code is generated. As you make changes, the display updates to show what you ordered-up. At lower right the horizontal sliders select Output-Compare modes. Notice those vertical slider controls on the above image upper right side? They adjust PWM Duty-Cycle percent. What shows on the display will also show on your O-Scope! See next image. Those same waveforms will appear on an oscilloscope hooked to your MCU output port pins (after you upload the code of course). ![]() Using selections you make (Clock, Timer and Mode) along with your desired Frequency, the application even shows a depiction of your Arduino PWM waveforms. that generates C++ code for Arduino Timers 1, 2, 3, 4 and 5. Runtime Micro is offering a free Windows Desktop app. If you've ever struggled with Arduino PWM or Timer coding, I've got good news.
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