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I had a 10k resistor to ground on each of the 3 inputs, but other than that it was just the chip in the circuit.
C always seemed a bit daunting to me so I started off by learning assember, the 35 instructions are a blessing and a curse though, it makes things like serialising data very easy and quick but you have to be creative to do some more complex things. To do the same as a single line of C code can often be 5 or 6 or sometimes more lines in assmbly.
So now that I have got the screens working it is time for the hard part, doing something useful with them.
Oh, and as it turns out the 16f628 only runs at 4MHz, not 8 as I originally thought, so it should be possible with a bit of tinkering to get a completely flicker-free display.
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In Topic: Ace Space Mpu Dot Matrix Displays
30 December 2008 - 12:00 AM
I've been hard at work with this today and after wasting almost an hour due to the assembler and pic programmer using different files I eventually made some progress. I used a PIC16F628A running at 8MHz and if you use interleaving to draw to the screen (write rows 0,2,4,6,8 etc then rows 1,3,5,7 etc) then there was virtually no flickering even when writing to all 21 lines. I took a while to figure out the most significant bit first / least significant bit first but that was a simple change in the code to get that working properly. All in all thanks to your guidelines it was fairly easy to get the whole thing up and running, which considering I have had the displays here for almost 2 years and not known how to use them to get this far in a day is unbelievable. So I have to say ...
