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Testing newly designed LP2106 Board

2004-09-15 by Chris Graham

I've designed an LP2106 board that includes a few special features I need 
such as MIDI, an EPROM, etc.  I've had the alpha PCB manufactured and 
intalled the parts, and am now testing.  (If I can get this working, I may 
make the design available in the list archives as its MIDI capabilites could 
be useful to others)

I put a JPG of the schematic here 
http://members.shaw.ca/photonwind/Images/Processor%20Schematic.JPG.

I first populated the power supply parts and verified that the voltages were 
correct.  Then I populated all the parts related to the processor, reset, 
and the MAX3221 serial converter.

I'm now trying to get the bootloader to work.  I installed the jumper to tie 
P0.14 low, started up the Philips bootload utility, set 9,600 baud and set 
the crystal frequency to 14746 khz to match the board's crystal.

Then I pressed the "Upload to Flash" button and hit the reset button  when 
promped.  The board does not respond.  I can trace the RS232 signal from the 
PC through the MAX3221 to the correct pin on the LP2106.  I also verified 
that the Reset button is pulling the RST pin low, and the P0.14 pin is 
really pulled low.

I see no signal being returned by the board out of TXD0 to the MAX3221.

I've done all this in the past with a TiniArm board and the setup external 
to the board is the same, so I know generally what I'm doing.

Is this a reasonable way to test a new board?  Have I overlooked anything?

Thanks in advance.

- Chris

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