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Forum Index : Microcontroller and PC projects : MicroMite Beta 18
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| Frank N. Furter Guru  Joined: 28/05/2012 Location: GermanyPosts: 831 |
Hi, it seems that a STRG+C within the first seconds erase the program (BETA 18, 44Pin with OPTION AUTORUN ON, OPTION LINES 35)??? My µMite is powered over a PL2303 Now I will test this behavior with another program on another µMite... EDIT: I tested now with WhiteWizzards modules and I can't produce the effect. EDIT2: Now I can't reproduce this behavior with my PL2303 µMite - what's going on? 
I erased two times my program with CTRL+C at startup... Frank |
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Geoffg Guru Joined: 06/06/2011 Location: AustraliaPosts: 3196 |
What is STRG+C? Do you mean Control-C? This is very strange behaviour indeed. It could be that the console Tx and Rx were accidentally shorted during power on - that would reset MMBasic and erase the program. Geoff Geoff Graham - http://geoffg.net |
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| Frank N. Furter Guru Joined: 28/05/2012 Location: GermanyPosts: 831 |
Hi Geoff, yes! I mean the Control-C (labeld with Strg on my keyboard). But at the moment I can't reproduce the erasing! I lost 2x my program... Frank |
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| Frank N. Furter Guru Joined: 28/05/2012 Location: GermanyPosts: 831 |
After my last reconnecting the PL2303 to my PC I getted a blue screen... I tried the same procedure many times but I can't reproduce the problem again... A physical connection of Rx and Tx is impossible (...and I don't lost my OPTION LINES 35) after this strange behavior - only my program was lost! I will try again... Frank |
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| Frank N. Furter Guru Joined: 28/05/2012 Location: GermanyPosts: 831 |
Ok, I flashed my PIC new, transfered my program, setted the options and started again with the same procedure as above BUT I DON'T LOST MY PROGRAM! I hope it was a unique misbehavior of my MicroMite... Sorry Geoff for the confusion... Frank |
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OA47 Guru Joined: 11/04/2012 Location: AustraliaPosts: 926 |
I had a similar problem on earlier betas when I had the console RX and Tx reversed. Entered a Ctrl-C to break a running program and ended up clearing the program. Maybe a similar issue? |
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| Frank N. Furter Guru Joined: 28/05/2012 Location: GermanyPosts: 831 |
My Rx and Tx connection is fixed but I had problems with my PC today (2 blue screens because Teraterm and/or PL2303 driver). Is it maybe possible that the Prolific drives the input high as output (because of mailfunction)? This would this behaviour explain... Frank |
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vk4tec Senior Member  Joined: 24/03/2012 Location: AustraliaPosts: 239 |
Been watching with interest about developments What hardware are you working on ? Release date ? Andrew Andrew Rich VK4TEC www.tech-software.net |
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TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6102 |
Frank, I don't have a lot of confidence in the Prolific chips. There were a lot of clones about and the efforts to create drivers that worked with the genuine chips and not the clones seems to have caused problems. Andrew, The micromite will be released in the May issue of Silicon Chip. Think of a 28 pin Picaxe running MMBasic. Jim VK7JH MMedit  MMBasic Help |
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| vk4tec Senior Member Joined: 24/03/2012 Location: AustraliaPosts: 239 |
What is a pic axe. ? Andrew Andrew Rich VK4TEC www.tech-software.net |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2817 |
Frank, Along with TassyJim (and many others), I too don't have much confidence with the Prolific chips (previous posts have debated this but as I mentioned at the time - this kind of inconsistency is exactly why I steer clear of them!). If you experience this again with the FTDI usb-to-uart such as used on my 44-pin MicroMite Module, then please do let us know the steps taken and I will recreate here to investigate! Thanks . . . For everything Micromite visit micromite.org Direct Email: whitewizzard@micromite.o |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6102 |
http://www.picaxe.com/ VK7JH MMedit  MMBasic Help |
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9308 |
The GENUINE Prolific 2302 seems to go fine, if you can find one, but as mentioned - there are so many 2302 clones out there now, and the drivers for the clones tend to be exceptionally flaky. I argued this morning for about two hours with a cheap 2303 on a pager programmer cradle. This was embedded into the programmer itself - all there was, was the USB socket on the device. I cracked it open, found the TXD and RXD, cut and isolated them, moved them to a socket on the case. Connect this to a 232 level corrector, hook to PC and it works like a charm WITHOUT any drivers needed, cos I am now using the native COM1 serial port. I tell you - the 2302 clones can cause you so much trouble, I whole heartedly encourage you to find another brand of converter such as FDTI based UNLESS you can guarantee that you are using a genuine Prolific adaptor. Smoke makes things work. When the smoke gets out, it stops! |
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| Greg Fordyce Senior Member Joined: 16/09/2011 Location: United KingdomPosts: 153 |
A few more small corrections for the manual. 
Page 5 describes 44 pin chips but doesn't mention which 2 pins you lose access to if you use a USB enabled PIC32MX250. Page 17, Measuring temperature heading, remove underlined words. Page 18, Micromite pin 2 not labelled on drawing. Page 25, change pin "9" to 25 I've only got to page 30, might find a few more. 
Greg |
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| Frank N. Furter Guru Joined: 28/05/2012 Location: GermanyPosts: 831 |
Hi Folks, it should be a PL2303HXA (inside a cable) from Adafruit. I know that somebody hate the Prolific chips but i hadn't problem with this adapter... up to now... Normaly I prefer the FTDI chips too (but colleagues in my last job had great problems with a unusual configuration where the chip doesn't do what in the datasheet was - but I didn't exactly which problem was) The only "real" problem I know with the Prolific chips is with Win8 but I have Win7... Frank |
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| robert.rozee Guru Joined: 31/12/2012 Location: New ZealandPosts: 2350 |
this is a common problem, caused by certain atmospheric conditions. fortunately, the solution is simple. take a blowtorch and, with the flame adjusted to a medium blue, heat up the prolific PL2303 chip until it starts to glow red (remember - blue flame, red chip). this will drive off excess smoke that has accumulated within the prolific chip. keep the heat on until no more smoke is produced. your prolific chip has now been reset to it's factory default settings and will not cause you or anyone else any more problems. remember: blue flame, red chip, keep heat on until no more smoke. with a little practice, this procedure can be applied to multiple PL2303 chips at the same time. it is considered best, by most sensible people, to treat all your PL2303 chips in this way immediately upon their arrival. rob :-) |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2817 |
I have a slight modification to Rob's method above as follows: Keep the blue flame going even when chip glowing red, then keep it going until the chip goes up in smoke! Then replace it with an FTDI chip 
This will solve all your problems  . . . .
For everything Micromite visit micromite.org Direct Email: whitewizzard@micromite.o |
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| Frank N. Furter Guru Joined: 28/05/2012 Location: GermanyPosts: 831 |
...I think we should build a heatcontrol with a µMite for a controlled burning off... Frank |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2817 |
(just ensure you use a FTDI to debug it or it will never work)
For everything Micromite visit micromite.org Direct Email: whitewizzard@micromite.o |
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| Greg Fordyce Senior Member Joined: 16/09/2011 Location: United KingdomPosts: 153 |
Found another small typo on Page 61 Should probably read "I2C is ideally suited for communications between integrated circuits." Greg |
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