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Propeller updates

EricBall

Entry posted by EricBall

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So I posted my OnePinTVText driver. That's right, a text display on a TV using only 1 pin. Actually, there's no reason it can't do any other monochrome display with an 8x8 font. Anyone for a nice game of chess? Not much feedback yet. Sniff. I'd like to try to get it to work with the internal RC ~12MHz clock, but my first try didn't work. So I'll put that idea on the back burner for the moment.

 

My next project is to add SD support to my Z-machine interpretter so it can play the Infocom games. The first step is to wire up an SD socket. Unfortunately, no-one makes a pre-built adapter that I can just plug into my Demoboard. (There's one which is usable, but it still requires jumper wires.) So I started with a old 5.25 floppy edge connector (which apparently works). Unfortunately, the wires in the ribbon cable aren't stiff enough to push into the breadboard. So I've wirewrapped them to some wirewrap pins I have. I don't have any jumper wires so I built some with more wirewrapped pins.

 

Of course, it doesn't work. Sigh.... I need to spend some quality time with my ohmmeter and see if I can figure out any obvious problems before I ask for help.

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EricBall

Rewired it and now the SPI interface can read it, but the data coming off the disk isn't sane (block 0 doesn't have 55AA). I think the previous problem was I had inverted the pin order. The fact that the low-level interface is happy is a good sign I've got that right now. But the garbage data is disturbing. My temptation now is to remove the "jumpers" from the equation.

 

However, I have a sneaking suspicion that getting something pre-built might be a better way to go.

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EricBall

I bought the pre-built option and now everything is working. The problem now is the filesystem library is being actively worked on so I'm waiting for it to stabilize before I start modifying it to meet my requirements.

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