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Messages - erikm

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P89V51Rx2/P89LV51Rx2 / Re: P89V51RD2 Problem
« on: January 17, 2008, 06:13:52 am »
just a suggestion

while I am not familiar with your ftdi chip, how about a switch or jumper that hold the ftdi in reset.  If the chip require CTS like the vinc, then configure the board so that signal is false during reset/bootload


Feature Requests / Re: I'm puzzled
« on: January 17, 2008, 06:10:38 am »
not a problem, I just click 'mark all messages read' when I have read the non-spam posts.


PS I wish all fora had the 'mark all messages read'  thanx.

Feature Requests / I'm puzzled
« on: January 15, 2008, 02:44:21 pm »
I have configured to "show new messages" and it works as a charm.  When I see spam, I click "mark all messages read" and "no unread messages" comes up.  However, if I reply to some, back up, and then "mark all messages read" it show some post index. Then, if I exit and reenter it states "no messages since last visit"

this is NOT a problem, just curious.


P89V51Rx2/P89LV51Rx2 / Re: P89V51RD2 Problem
« on: January 15, 2008, 02:38:39 pm »
I do suspect that the FTDI chip is generating some garbage at power on that simple makes the 89V51 to go crazy.

You do not state which ftdi chip you use, but the Vinculum babbles its little head off after you reseet it.


When programming fails it could be that the no touch code is not complete or the uart is not setup properly. In that case there is no way to reconnect to the processor anymore.

1) NoTouch was never intended for 'development' but for 'update by customer' Once your development is complete, the concerns you bring up should be irrelevant.
2) a 'factory freash' chip arrives in ISP mode, no pulses or other means is needed to program it
3) when using NoTouch for development, also include 'the backdoor'.  Of course this requires that the first upload (from 'factory fresh') is succesful. Quite a few use NoTouch/TheBackdoor for development.
4) I would have a few "easy cuts" on the PCB so, in case of several failures, an external jig could be made to switch Vdd and pulse reset.


and the resolution is there as well.

It was, if you do not take things too far, a 'programming problem.  He programmed to protect an area where he read code from.


YES, have a look at NoTouch

it is here - search

Read the discussion of NoTouch at the P89C51Rx2 version, use the LPC version.


LPC2xxx / Re: FlashMagic on PCs USB-Port
« on: November 26, 2007, 07:03:42 am »
only (as far as can be determined by the many posts on this subject) USB to serial converteres based on a FTDI chip works.

Most USB to serial converters should correctly be named USB to some kind of partial serial converters.


I  believe that the '668 just like the original Rx2 need P1.6 and p1.7 kept high.


every time I see a thread like this a proverb comes to mind:
"thief think everyone steals"

I see no reason to 'protect' object code.  It is, at least, 5 times faster to recreate code from scratch that trying to do it from a disassembly.


P89V51Rx2/P89LV51Rx2 / Re: Could not able to download my HEX Code
« on: September 12, 2007, 10:15:18 am »
wen i give 5V to PIN 4

meaningless statement

DO NOT use pin numbers, they do nmot maen the same for different packages.


LPC9xx/LPC9xxx / Re: RTC configuration for P89LPC922
« on: June 06, 2007, 05:32:47 am »
Wrong forum

what does this have to do with FlashMagic


LPC9xx/LPC9xxx / Re: programming P89LPC935
« on: June 01, 2007, 02:02:08 pm »
as answered in cross posting at 8052,com

To program it via isp (Flash-magic)i use max232
and 2 npn transistors to go from 3.3 to 5 volts for txd and 2 npn transistors to go from 5 to 3.3 volts for rxd.

As long as the MAX232 is powered by 5V there is no need for the 2 NPN transistors. Using a 3V3 powered MAX3232 is far better, but a MAX232 with Vcc 5V will work, just not quite as noise resistant. Do you have the right capoacitors on the MAX232 (there are so many variants with different capacitor values - doub naah triple check).

There is no reason whatsoever that the other LPC935 should not work, check your connections.


LPC9xx/LPC9xxx / Re: help notouch source to program 89LPC936FA
« on: May 14, 2007, 07:11:42 am »
I made the original NoTouch (for the P89C51Rx2 series) and there is documentation that apply to all versions (just ignore the code) of NoTouch and it's use for developement ('the backdoor'

read those


LPC2xxx / Re: USB to Serial Adapter / Cable - Experience wanted
« on: May 11, 2007, 09:05:07 am »
there is a thread somewhere in this forum re what works and what does not.


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