
//  Clock, GPIO, Timer1, UART0, PWM0 

// Clockó 22M Ƶ 72M, XT_12M  72M ĴҲд,PCLK  HCLK ĶƵ

// Timer1  1MHz, ں Delayus() ΢ʱ.

// PWM0_PC012345, NuEdu:PIN44~48,PIN50, Ҳ,  ӵ, Hall Ҳת

// PA012  Hall_ABC, GPIO ж Hall Ƕ,

// UART0  Tx  PD1, NuEdu ϵ PIN15, ᲻ַͣ: UART0 OK !
