最近從事Embedded sysetm的工作後,常處理I/O,有需要的請自行取用
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< class="code">
#define AP_FALSE 0
#define AP_TRUE 1
//======== common type define ====================
typedef unsigned char BL;
typedef unsigned char U8; /* Unsigned 8 bit quantity */
typedef signed char S8; /* Signed 8 bit quantity */
typedef unsigned short U16; /* Unsigned 16 bit quantity */
typedef signed short S16; /* Signed 16 bit quantity */
typedef unsigned long U32; /* Unsigned 32 bit quantity */
typedef signed long S32; /* Signed 32 bit quantity */ /******************************************************
function name :bitclr
description :清除指定位元(0)
bitaddr :0~31
******************************************************/
U32 bitclr(U32 srcvalue,U8 bitaddr)
{
U32 mask=1;
return srcvalue&(~(mask<
>bitaddr)&mask==1)
return srcvalue&(~(mask<>bitaddr)&mask==bitvalue)
return AP_TRUE;
else
return AP_FALSE;
}
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