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Topics - evoluer

Hello all,
I am having a problem for the last 3 weeks and i am not able to find a solution for it. Let me explain the problem in detail.

When i try to download the program, i get the following error Failed to read device signature ( operation failed .(reading signature)). Accessing a device using the wrong protocol could render the device unusable. Do you want to continue?

controller: lpc2148
oscillator: 12MHz crystal
serial connection through max3232
reset and program switch connection
Software used : Flashmagic version9.73.4146 arm7 UART driver version: 5.00.3965

Hope someone can point me in the right direction