Printable View
I am trying to program a PIC16F887 to convert letters into the corresponding morse code and then output it through a speaker. The problem I am having is how to change the frequency of the output.
I'm using assembly/machine language so it's a little rough in terms of trying to get any help with it. I would imagine it would have to be the OSCCON register but I can't seem to figure out how to make it output at 1kHz.
Any help would be greatly appreciated.
The osccon register controls the frequency of the internal clock if you are using it. I am unfamiliar with assembly language but I think you simply need to use NOP commands/ pauses to correctly time how long a pin is on/off...
NOP = 1uS @ 4MHz
Set pin High, add 500 NOP statements, Set pin Low, add 500 NOP Statements... repeat... suppose that's one way of outputting 1KHz...
Do a forum SEARCH for Morse Code... I remember doing an example some time in pre-history...
Ah... here it is...
http://www.picbasic.co.uk/forum/show...31031#poststop