Samsung单片机C语言(IAR)应用

本人用过三星单片机如S3F9488、S3F9454、S3F9498,以前一直是用汇编编程OPENICE-I500,现在改用C,遇到几个小问题已解决的或未解决的,希望能与各位聊聊,以增加对C语言的了解.
1、头文件:S3F9488的头文件用ioS3C9488.h,因为S3F9488与S3C9488的规格书是相同的只是前者是FLASH,后者是OTP,
2、编译后.lst文件会有如AND 0xDF,#252的语句,从语句分析是编译器指向PAGE0,但实际我没有用到PAGE1,一直是在PAGE0操作.(只针对9488,其它不知是否也会)

如果各位有汇编或C语言的问题,请提出,我尽力给你答复

全部回复(8)

只看楼主

正序查看

倒序查看

wwy_0168

LV.2

2007-08-14 22:33

先自顶

以下是一段24C02的程序

void AT24CXX_WriteFullPage( unsigned int wAddress , unsigned char* pBuffer )
{
    unsigned char ucVar;

    while ( AT24CXX_Enabled() == FALSE );
    AT24CXX_Start();
    AT24CXX_SetWriteAddress( wAddress );
    for ( ucVar = 0 ; ucVar < AT24CXX_PAGESIZE ; ucVar ++ )
        AT24CXX_Write( pBuffer[ ucVar ] );
    AT24CXX_Stop();
}
/******************************************************************************/

下面是编译后的.lst文件

   \                                 In segment CODE, align 1, keep-with-next
    193          void AT24CXX_WriteFullPage( unsigned int wAddress , unsigned char* pBuffer )
   \                     AT24CXX_WriteFullPage:
   \   0000                          REQUIRE __INIT_STACK
    194          {
   \   0000                  ; * Stack frame (at entry) *
   \   0000                  ; Param size: 0
   \   0000
   \   0000   70C9           PUSH      R9
   \   0002   70C8           PUSH      R8
   \   0004   70C7           PUSH      R7
   \   0006   70C6           PUSH      R6
   \   0008                  ; Saved register size: 4
   \   0008                  ; Auto size: 0
   \   0008   68CE           LD        R6,R14
   \   000A   78CF           LD        R7,R15
   \   000C   88CC           LD        R8,R12
   \   000E   98CD           LD        R9,R13
    195              unsigned char ucVar;
    196
    197              while ( AT24CXX_Enabled() == FALSE );
   \                     ??AT24CXX_WriteFullPage_0:
   \   0010                  ; Setup parameters for call to function AT24CXX_Enabled
   \   0010   F6....         CALL      AT24CXX_Enabled
   \   0013   42FF           OR        R15,R15
   \   0015   6BF9           JR        Z,??AT24CXX_WriteFullPage_0
    198              AT24CXX_Start();
   \   0017                  ; Setup parameters for call to function AT24CXX_Start
   \   0017   F6....         CALL      AT24CXX_Start
    199              AT24CXX_SetWriteAddress( wAddress );
   \   001A                  ; Setup parameters for call to function AT24CXX_SetWriteAddress
   \   001A   E8C6           LD        R14,R6
   \   001C   F8C7           LD        R15,R7
   \   001E   F6....         CALL      AT24CXX_SetWriteAddress
    200              for ( ucVar = 0 ; ucVar < AT24CXX_PAGESIZE ; ucVar ++ )
   \   0021   B0C7           CLR       R7
   \   0023   8B12           JR        ??main_4
    201                  AT24CXX_Write( pBuffer[ ucVar ] );
   \                     ??AT24CXX_WriteFullPage_1:
   \   0025                  ; Setup parameters for call to function AT24CXX_Write
   \   0025   E8C8           LD        R14,R8
   \   0027   F8C9           LD        R15,R9
   \   0029   02F7           ADD       R15,R7
   \   002B   44CEDF         OR        0xDF,R14
   \   002E   C7FF           LD        R15,@R15
   \   0030   56DFFC         AND       0xDF,#252
   \   0033   F6....         CALL      AT24CXX_Write
   \   0036   7E             INC       R7
   \                     ??main_4:
   \   0037   A6C708         CP        R7,#8
   \   003A   7BE9           JR        ULT,??AT24CXX_WriteFullPage_1
    202              AT24CXX_Stop();
   \   003C                  ; Setup parameters for call to function AT24CXX_Stop
   \   003C   F6....         CALL      AT24CXX_Stop
    203          }
   \   003F   50C6           POP       R6
   \   0041   50C7           POP       R7
   \   0043   50C8           POP       R8
   \   0045   50C9           POP       R9
   \   0047   AF             RET
   \   0048                          REQUIRE ?CLSAM8_2_L00
    204          /******************************************************************************/
    205

问题就在于有AND       0xDF,#252的行,还有就是入栈,这并不是在中断,可是却有入栈?哪位高手来讲述一下.