GPIOB的位带操作膨胀计算公式

详见火哥P20

https://www.bilibili.com/video/BV1Xs411g7Aj?p=20

> #define GPIOB_ODR_Addr  (GPIOB_BASE + 0X0C)
> #define PBout(n)  *(unsigned int *)((GPIOB_ODR_Addr & 0xF0000000) + 0X02000000 + ((GPIOB_ODR_Addr & 0x00FFFFFF) << 5 ) + (n << 2))