Messages

1

NXP^TM LPC2XXX and LPC17XX / Re: Using the ISP on the LPC2378 should be easy....right?

« on: March 12, 2008, 10:43:26 PM »

My mistake, RTCK is pulled low through a 10k via my JTAG board.

Hmmm. That would leave me with not much.......crap.

2

NXP^TM LPC2XXX and LPC17XX / Re: Using the ISP on the LPC2378 should be easy....right?

« on: March 12, 2008, 10:32:10 PM »

Thanks for the input.

Pins 21, 81 and 98 are n/c right now and are floating.

I will check that RTCK is pulled down via 10k, it is not right now but I am not in front of my board.

This problem is occuring on a couple of PCBs so I am not so sure that it is the chip. I will check in a couple of hours though.....thanks for the suggestion.

I will keep you posted. If you wake up at 3am with any other suggestions, please let me know.

Cheers,

Steve

3

NXP^TM LPC2XXX and LPC17XX / Re: Using the ISP on the LPC2378 should be easy....right?

« on: March 12, 2008, 10:13:27 PM »

As far as I know on this chip, there is only a 3v3 supply. It is running a bit hot right now at 3.4v but still stable. I have not connected to any other power.

I have also attempted to connect via JTAG but am getting a "Communication Error" that I am having a rough time getting away from. Still trying to debug that one as well.

So far, all I have really done is scoped a lot of signals that do not seem to be weird. (Although the RTCK signal from JTAG looked more inductive that like a square wave) I ended with that yesterday.

The reset is going straight to the chip along with P2.10, power and ground.

Are there any lines that I must pull to a known level other than P2.10? Maybe I missed pulling a line high/low causing the uC to go into some weird mode.

This whole thing is becomming extremly frustrating as the only thing on the board right now are decoupling caps, the LPC2378, couple of resistors and the JTAG interface. How much simpler could it get?

To tell you the truth, I have no idea where to even look anymore.

Cheers,

Steve

4

NXP^TM LPC2XXX and LPC17XX / Re: Using the ISP on the LPC2378 should be easy....right?

« on: March 06, 2008, 05:50:18 PM »

I have tried this, at various baud rates.

Still no luck.

Everything has been scoped out.

RST is low, P2.10 is low. Let RST rise high, send '?' and I get no response from the uC.

Still lost.

Any other comments? Rails look good.

According to the datasheet, the crystal is only used when the software switches to it so I should be good depending on the internal RC.

5

NXP^TM LPC2XXX and LPC17XX / Re: Using the ISP on the LPC2378 should be easy....right?

« on: March 03, 2008, 12:03:22 AM »

I did scope out the rst and P2.10 lines and they are shown. RST is the top, I would not have expected that little glitch but that is what is coming from Flash Magic.

This has been tried on two separate machines, two separate com ports, two separate boards, identical results.

I also attemped on manually triggering RST and P2.10, sending a U, and waiting for a response. Nothing.

The crystal does not need to function for this correct? It can run off of the internal RC right?

Now sure what else to check, cannot fit more frustration into my weekend......rrrrrrr.

6

NXP^TM LPC2XXX and LPC17XX / Using the ISP on the LPC2378 should be easy....right?

« on: March 02, 2008, 10:47:01 PM »

Hello all:

I am having a really rough time programming with Flash Magic on a new PCB with a fresh chip. I have very limited experience with this chip.

As a summary:

Power is good, signals are good.

Scope out TX, getting data all the way to the uC.
The RST and INTO lines are being strobed as requried.
The system keeps failing the AutoBaud section of the ISP. In other words, it does not even start.

Suggestions on what I could try next would be appreciated. I even brough up a alternate PCB with just the uC, power, RS232 and control circuits with no luck. I am totally at a standstill here.

Thanks in advance for your suggestions.