PWM problems

[Bachman]

Hello!

I made a little PWM test and i found two problems. See attached program.

First problem: When i power up the controller, after the PWM enable, it's turns on as full duty until it's get another command.

Trun_ON_1.jpg (69.87 KiB) Viewed 4209 times

Turn_ON_2.jpg (65.27 KiB) Viewed 4209 times

[Bachman]

Second problem: Set the duty to 255, simulation shows az 100 %, but in the real HW, it's not 100 %.

Duty_255_1.jpg (65.37 KiB) Viewed 4208 times

Duty_255_2.jpg (64.54 KiB) Viewed 4208 times

[Benj]

Hello,

I can maybe see why you are not getting 100% duty on. You are writing to the PWM duty register even when the duty remains constant so maybe this is causing the problem.

If you move the SetDutyCycle call into the decision icons yes branches then does this solve the problem?

[Bachman]

It's doesn't matter, where is the SetDutyCycle command. After the PWM enabled, the output goes to full duty until it's got another SetDutyCycle command. I've tested it on Flowcode 5, on that version, only the second problem exists, set duty to 255 is not 100 % duty on the HW.