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capture input example need

Question asked by yazdansepas.iman on Sep 19, 2012
Hello every one 
Is anybody have a good code for capture input in stm32f4?
i want to measure a spacial pulse with but i trying to use of PWM INPUT but i think it's not working good.i connect pulse generator on pb.7 pin and set it on 54 khz or more and run program and put watch expression  on Frequency value but it's not have fix value every time it's have different value .Am i in a correct way for test this example?