LPC935FDH Can only program first time

Started by laps, December 07, 2011, 08:43:22 AM

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 have just made a circuit base on the mcb900 and have tried programming
a LPC935FDH in this circuit. It worked the first time, however when I tried to re-program
it again it would not work and I recieved a unable to communicate message from flashmagic.
Any suggestions on what I am doing wrong

Andy Ayre

Brand new devices reset into the bootloader. Programmed devices do not.

You are probably failing to start the bootloader. Check with a scope that three pulses are being received on the reset pin after power on.

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