Post by thread:Morse keyer code

I am relatively new to "PICing", but have a protoboard, a programmer, and some 16F84s with which to learn. I also have the PicBASIC compiler from MEL. So far, my efforts have been flashing LEDs, raeding switches, sending RS-232 to a PC, and reading an ADC0831. I've seen a few postings about "simple" morse code keyers, and would be interested in using that as a project to learn more about the PICs. Then I could include that functionality in a project which is a simple/low cost digital display for homemade radios I build. Most of the keyers seem to use the low-end PICs, such as the 12C and 16C5x. I assume that is for cost and size considerations. Am I correct in the belief that the same code should run on the 16F84. I'd like to stay with that chip because of the EEPROM which makes debugging easier. Is there any "freeware" code for a CW keyer? I've always found the best way to learn a new programming language is to look at somebody else's code and see how it works. Does it make any sense to try to write a keyer program in PicBASIC? I know this may offend the assembler purists, but I had to ask. How about using a hybrid of PicBASIC and inline assembler for the time-critical routines, interupt handlers, etc.? I haven't had this much fun since my 8008, 8080, Z80, 6502 days. Any sugestions would be appreciated. Jim

On Tue, 10 Feb 1998 14:55:07 -0500 jim nestor <spam_OUTnestojiTakeThisOuThome.com> writes: >Then I could include that functionality in a project which is a >simple/low cost digital display for homemade radios I build. PICs make good frequency counters. Without external components (other than amplifying the signal up to TTL levels), any PIC can count a 50 MHz signal to a single cycle. This is usually just right for homemade HF radios. Once the frequency is counted, advanced features can be added like adding/subtracting IF from the displayed frequency, or "locking" the frequency to compensate for slow drift. The CW keyer functions could possibly even be in the same PIC. Likely you'd need to go to a PIC with more than 1 hardware timer to do both simultaneously. _____________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com Or call Juno at (800) 654-JUNO [654-5866]

Mike Keitz wrote: > > PICs make good frequency counters. Without external components (other > than amplifying the signal up to TTL levels), any PIC can count a 50 MHz > signal to a single cycle. This is usually just right for homemade HF > radios. Once the frequency is counted, advanced features can be added > like adding/subtracting IF from the displayed frequency, or "locking" the > frequency to compensate for slow drift. How ? a prescaler is out of the question if your counting "to a single cycle" You must mean 5MHz Peter Cousens email: .....peterKILLspam@spam@cousens.her.forthnet.gr phone: + 3081 324450, 380534 snailmail: Folia, Agia Fotini, Karteros, Heraklion Crete, Greece.

Peter Check out the 50MHZ frequency meter at http://www.picpoint.com under the projects section. I cobbled one together last nite on a SIMM Stick. There are a couple of typos in EFMETER.asm (WDTE instead of WDT in the declarations and a ": " instead of a "; " in one of the comments. I can't read the Italian but the source is commented in English. I only needed it to work to 30MHZ and it does that nicely. 3 digits and an exponent with very low parts count . Bob Peter Cousens wrote: {Quote hidden}> Mike Keitz wrote: > > > > PICs make good frequency counters. Without external components > (other > > than amplifying the signal up to TTL levels), any PIC can count a 50 > MHz > > signal to a single cycle. This is usually just right for homemade > HF > > radios. Once the frequency is counted, advanced features can be > added > > like adding/subtracting IF from the displayed frequency, or > "locking" the > > frequency to compensate for slow drift. > > How ? a prescaler is out of the question if your > counting "to a single cycle" > You must mean 5MHz > > Peter Cousens > email: peterKILLspamcousens.her.forthnet.gr phone: + 3081 324450, 380534 > snailmail: Folia, Agia Fotini, Karteros, Heraklion Crete, Greece.