2.位带操作

1.位带操作:2.位带操作_第1张图片

2.位带区与位带别名区地址转换:

  1. 外设位带别名区地址:AliasAddr=0x42000000+(A-0x40000000)*8*4+n*4;
  2. SRAM位带别名区地址:AliasAddr=0x22000000+(A-0x20000000)*8*4+n*4;
  3. IO口操作宏定义:
    #define BITBAND(addr, bitnum) ((addr & 0xF0000000)+0x2000000+((addr &0xFFFFF)<<5)+(bitnum<<2)) 
    #define MEM_ADDR(addr)  *((volatile unsigned long  *)(addr)) 
    #define BIT_ADDR(addr, bitnum)   MEM_ADDR(BITBAND(addr, bitnum)) 

3.位带操作优点:

  1. 控制GPIO口输入输出非常简单;
  2. 操作串行接口芯片非常方便(DS1302,74HC595)等;
  3. 代码简洁,阅读方便。

4.对GPIO输入输出部分功能实现位带操作:

//0,不支持ucos
//1,支持ucos
#define SYSTEM_SUPPORT_OS		0		//定义系统文件夹是否支持UCOS
																	    
	 
//位带操作,实现51类似的GPIO控制功能
//IO口操作宏定义
#define BITBAND(addr, bitnum) ((addr & 0xF0000000)+0x2000000+((addr &0xFFFFF)<<5)+(bitnum<<2)) 
#define MEM_ADDR(addr)  *((volatile unsigned long  *)(addr)) 
#define BIT_ADDR(addr, bitnum)   MEM_ADDR(BITBAND(addr, bitnum)) 
//IO口地址映射
#define GPIOA_ODR_Addr    (GPIOA_BASE+12) //0x4001080C 
#define GPIOB_ODR_Addr    (GPIOB_BASE+12) //0x40010C0C 
#define GPIOC_ODR_Addr    (GPIOC_BASE+12) //0x4001100C 
#define GPIOD_ODR_Addr    (GPIOD_BASE+12) //0x4001140C 
#define GPIOE_ODR_Addr    (GPIOE_BASE+12) //0x4001180C 
#define GPIOF_ODR_Addr    (GPIOF_BASE+12) //0x40011A0C    
#define GPIOG_ODR_Addr    (GPIOG_BASE+12) //0x40011E0C    

#define GPIOA_IDR_Addr    (GPIOA_BASE+8) //0x40010808 
#define GPIOB_IDR_Addr    (GPIOB_BASE+8) //0x40010C08 
#define GPIOC_IDR_Addr    (GPIOC_BASE+8) //0x40011008 
#define GPIOD_IDR_Addr    (GPIOD_BASE+8) //0x40011408 
#define GPIOE_IDR_Addr    (GPIOE_BASE+8) //0x40011808 
#define GPIOF_IDR_Addr    (GPIOF_BASE+8) //0x40011A08 
#define GPIOG_IDR_Addr    (GPIOG_BASE+8) //0x40011E08 
 
//IO口操作,只对单一的IO口!
//确保n的值小于16!
#define PAout(n)   BIT_ADDR(GPIOA_ODR_Addr,n)  //输出 
#define PAin(n)    BIT_ADDR(GPIOA_IDR_Addr,n)  //输入 

#define PBout(n)   BIT_ADDR(GPIOB_ODR_Addr,n)  //输出 
#define PBin(n)    BIT_ADDR(GPIOB_IDR_Addr,n)  //输入 

#define PCout(n)   BIT_ADDR(GPIOC_ODR_Addr,n)  //输出 
#define PCin(n)    BIT_ADDR(GPIOC_IDR_Addr,n)  //输入 

#define PDout(n)   BIT_ADDR(GPIOD_ODR_Addr,n)  //输出 
#define PDin(n)    BIT_ADDR(GPIOD_IDR_Addr,n)  //输入 

#define PEout(n)   BIT_ADDR(GPIOE_ODR_Addr,n)  //输出 
#define PEin(n)    BIT_ADDR(GPIOE_IDR_Addr,n)  //输入

#define PFout(n)   BIT_ADDR(GPIOF_ODR_Addr,n)  //输出 
#define PFin(n)    BIT_ADDR(GPIOF_IDR_Addr,n)  //输入

#define PGout(n)   BIT_ADDR(GPIOG_ODR_Addr,n)  //输出 
#define PGin(n)    BIT_ADDR(GPIOG_IDR_Addr,n)  //输入

#endif

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