Let’s dive into Timer 2 and how it helps with PWM control! So, Timer 2 comes with specific pins laid out in the datasheet that make it super handy for managing PWM.
It usually features up to three channels, giving you the flexibility to handle various PWM tasks.
Right now, we’re focusing on using channel 3 for PWM control, showcasing a really practical application.
With these channels at your disposal, you can easily tailor PWM to match your needs.
This introduction is just the tip of the iceberg, setting up for a deeper look into PWM control using Timer 2..
How to Set Up Timer 2 for PWM Control?
Alright, let’s kick things off with the essentials! First up, you’ll want to import the library for Timer 2; this baby is key for mastering PWM timing control in your embedded projects.
Since we’re not using interrupts, it’s a good idea to strip out the related parts and bring in the necessary file, sm8tim2.c.
Next, we’ll modify TIM2.c by excluding unnecessary components like LED ports and GPIO settings, which helps make the system run more smoothly.
Remember, you can use all three channels of Timer 2 at the same time, giving you some real flexibility with your PWM control.
Finally, the setup gets underway quickly as we configure the system at a specific address to get everything ready for action..
How Do You Set Up PWM Parameters?
Setting up PWM parameters is all about the prescaler, which pretty much decides how frequently the PWM signal will operate.
You’ve got a prescaler range from 1 all the way up to 32,768! The period is super important too, as it sets the reference point for the duty cycle.
For example, in our demo, we’re using a period of 256, and that’s controlled with just one byte.
So, when you see 255, that means 100% duty cycle, and 128 means 50%.
This setup even works for different channels like OC3 for channel 3, while OC2 or OC1 runs for the others.
Lastly, we kick off the timer with the duty cycle set to 0 and the polarity cranked up to high, making it easy for us to tweak things as needed..
How to Use PWM with Timer 2?
So, let’s dive into how you can control an LED with PWM! First off, connect your LED and use the overflow function to turn it on and off.
The overflow is pretty neat because when you set the clock, it resets from 255 back to 0, since it’s just a single byte.
We’re focusing on channel 3 here, where you can tweak the duty cycle little by little.
Set the period to 20 milliseconds, which gives the LED a full bright state for about 5 seconds before it goes dark.
Don’t forget to adjust the prescalar and period correctly! Oh, and by the way, channels 1, 2, and 3 can all be set to the same frequency and period, but you can still customize their duty cycles for multiple PWM signals at once..
How Does PWM Control Work with Timer 2?
So, let’s dive into Timer 2 and its Channel 3, which connects to PA3 for our LED setup.
This cool setup lets us play around with PWM control, so we can make the LED shine brighter or dimmer based on values from 0 to 255 and then wrap back around.
It’s pretty neat to see the LED gradually brighten and dim, showing just how practical PWM can be.
In our session, we unpacked controlling PWM on the SM8 platform, giving you some handy insights into its real-world applications.
And before we sign off, we just want to say we can’t wait to bring you more cool content in the future! Thanks a ton for tuning in, and we hope you enjoyed this session!.