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V2.01 processor chip used as stand-alone CW keyer ?
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"dl2wb"
Dear fellows,
since I received the V2.02a firmware chip, I have one obsolete V2.01 processor in the shelf. I thought about using it as a standalone CW beacon keyer. So I set up a dummy board which provides 5 V with decoupling, the XTAL with caps and the keying FET with a pull-up. There is no DDS module, no display, no push-buttons attached. In the original U2, after turning on the power, the processor comes up straight away and starts keying (GPS setting = off). On my dummy board it does not. I put it several times back and forward but without any success on the dummy board. Obviously the processor gets stuck as it misses some feedback from the DDS or the display. Any idea of how to get the V2.01 chip run standalone as a simple keyer on a dummy board ? Regards from Bavaria, Tom, DL2WB |
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Hans Summers
Hi Tom I re-studied the code.? The processor doesn't wait for any feedback from the DDS. It just talks to it and hopes it listens.? However, it does expect communication back from the LCD! So this probably explains why you see no output. ?I believe that you can cheat it into thinking that the LCD is present, by connecting D7 LCD connection to Ground via a 1K resistor. This connection is pin 3 of the microcontroller. So, connecting the v2.01 chip pin 3 to Ground via a 1K resistor *should* (according to my theory), work.
73 Hans G0UPL On Sat, Jul 27, 2013 at 9:37 PM, dl2wb <t.blinn@...> wrote:
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