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testing lpc2478 input signal

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lgeorge123

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I have my lpc2478 pin 3.17 set as GPIO and as input wish to detect its input signal , once if it is low to do something , I have no idea how to do it in keil c !(like can I use #define input_pin 3<<17 , to test if it is low use( if (input_pin == 0) ......) something like that) , can someone help me!!
 

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