Search found 7 matches

Thanks Ttelmah.

Confirmed wiring on the max233.

I re-wired the thing with a max232 and recycled some 1uf caps from an old vcr I had sitting around. I am now getting 5V out with every keypress, ...

So in looking at the scope, my max 233 chip is receiving 20volts when I tap a key, but only giving me 1.8 volts out. I suspect this is just enough to drive a digital i/o pin in software, but not enou ...

Thanks PCM!

Your effort is greatly appreciated, and helps me know which direction to look.

I suppose it could also be a noise problem or other electrical problem like capacitance. I am currentl ...

Ttelmah: wasn't aware of the timing differences for the hardware and software getc(). I'll scope it out and try to make some sense of it. My hobbyist usb bitscope seems to be disturbing the signal q ...

Ttelmah: good idea. Same symptoms exactly when I use the force_sw switch. Did you really mean I rule IN the uart if this it worked? In any case, it didn't work, which makes me think it is something ...

Thanks PCM.

Everything looks good with the connections from what I can tell. I even tried two different serial cables.

Also, these same connections work when I simply move the connection betwee ...

Hi people. Thanks for the great forum.

I am going nuts trying to read a character from the hardware uart.

Code below, compiler version Version 4.039, 39089. Works fine on any arbitrary pin exc ...