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I needed a quick way to test hobby servos that didn't involve radios, etc. I had a PIC18F development board with an RS-232 port lying around, so I wrote a quick and dirty tester.
I'm providing the source (in PBP 3) and the .HEX file. It does require an 18F PIC with a hardware serial port and 16K or more of FLASH simply because it presents so much text to help the user. The serial port runs at 9600 N-8-1.
It produces 8 channels of PWM for the servos with a refresh rate of 50Hz (20 mSec). You can increase or decrease the pulse width with the "U" or "D" keys on the keyboard. D-T interrupts are used, and the ints are shut off when the registers are updated since the values are 16-bit.
All should be clear by looking at the source.
You can find the files at ServoControllerCL3.zip
www.charleslinquist.com/ServoControllerCL3.zip
Re: PBP3 Optimization & Peripheral Control Techniques on PIC16F/18F Devices
Yes, all the time and most times in conjuction with DT-Ints for PBP context save/restore. For periodic/cyclic interrupts using TMR2 (or one of the same type) is nice because you set it up once and...
HenrikOlsson - 22nd May 2025, 15:27