Demonstrations for tim1 as capture pwm operation.

example function:
	PA0 30ms toggle putin PA1(TIM1_CH0) two cycle wave ;
	TIM1 Channel0 config capture rising
	PA9 toggle in TIM1_CH0 capture interrupt.
	
1. capture example ：
	FCLK：96M。
	
	timer cycle calculate formula：(period+1)/Freq *(Prescaler)   
								 = (0xFFFF+1)/96000000 * (128)
								 =  0.0873s

	