I replaced the SuperPro board, and everything appears to function, except one problem.
I have one printf statement.
printf("%X\n", junk);
When the board is connected through the USB, this prints '0' on TCLTerm every time I reset. When I apply the 7.5 Volts from my power supply TCLTerm prints 'Print' continously, unless I reset. Then it prints '0' followed by continous 'Print'.
Fixing a blown SuperPRO
Re: Fixing a blown SuperPRO
As I have no context here, there is not much to comment on. (context like, the source you are running, maybe the dates of the included files and how they compare to the latest release)
Does it do the same thing with the Csample.c program? If not I'd say you have a bug in your C program.
Does it do the same thing with the Csample.c program? If not I'd say you have a bug in your C program.
Re: Fixing a blown SuperPRO
I found the problem. The 'Print' text comes from the Interrupt routine. If I comment that out, then I get what I expect.
I'm not sure why the Interrupt runs when the external supply is connected, but not when the board is powered from USB. It might be due to noise and the Zero Crossing Detector is firing. In my test setup, the ZCD inout is open circuit. In actual use there may not be any problem. I'll have to look at that with a scope.
I'm not sure why the Interrupt runs when the external supply is connected, but not when the board is powered from USB. It might be due to noise and the Zero Crossing Detector is firing. In my test setup, the ZCD inout is open circuit. In actual use there may not be any problem. I'll have to look at that with a scope.
Re: Fixing a blown SuperPRO
Yes it is time to replace the board..I faced similar situation earlier and I changed the boarddanlee58 wrote:I got 3.0 Volts from 2 AA batteries. When I connect to the 3.3 Volt line the Green LED lights, but the battery voltage drops to about 2.3 Volts. I pushed the reset button & switched the LoadC switch with no effect. The 1756 gets hot under these conditions.
Time to replace the board!
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AMDlloydsp
- Posts: 99
- Joined: Mon Apr 15, 2013 3:51 pm
- Location: NE Central FL
Re: Fixing a blown SuperPRO
Y'know, I'm facing this from a purely commercial perspective, and my opinions might not apply to the evening experimenter... but...
I allowed the smoke to leak out of a SuperPro, and without its smoke, it no longer works. Actually, it was the LPC1756 itself, which I let 'drive' a 24V signal directly by accident. The 24V signal avoided following a chip lead to somewhere, and went out a little pinhole in the top of the encapsulation instead. The smoke leaked out that tiny pinhole because I wasn't fast enough with the Super-Glue.
Because I don't have a full-time bench area dedicated to soldering/desoldering surface-mount stuff, it would take me a good hour of setup, heatup/cool-down, de-fluxing solvents, cleanup, and actual work, and a buck or two of solder, solder-wik, low-temp alloy, etc. Also FIVE dollars worth of cursing, plus the cost of an LPC1756 and shipping of the one lousy little chip to fix the board.
To me, all that is WAY more cost than the very affordable $49.00 for a new SuperPro board!
Lloyd
I allowed the smoke to leak out of a SuperPro, and without its smoke, it no longer works. Actually, it was the LPC1756 itself, which I let 'drive' a 24V signal directly by accident. The 24V signal avoided following a chip lead to somewhere, and went out a little pinhole in the top of the encapsulation instead. The smoke leaked out that tiny pinhole because I wasn't fast enough with the Super-Glue.
Because I don't have a full-time bench area dedicated to soldering/desoldering surface-mount stuff, it would take me a good hour of setup, heatup/cool-down, de-fluxing solvents, cleanup, and actual work, and a buck or two of solder, solder-wik, low-temp alloy, etc. Also FIVE dollars worth of cursing, plus the cost of an LPC1756 and shipping of the one lousy little chip to fix the board.
To me, all that is WAY more cost than the very affordable $49.00 for a new SuperPro board!
Lloyd