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coufused by array and shift bit

taoist ren

Hi, The code is given below.

void CSToOut(void)
{
static unsigned char data bSimulate[8] ;
int I;

        for( I = 0 ;I < 8;I ++)
        {
                bSimulate[I] = 0x01 << I ;
                ComOutChar( bSimulate[I] );
        }
}


result: 00 00 00 00 00 00 00 00

why?

  • 0

    Maybe a problem with the ComOutChar function or your use of it?

  • 0 in reply to Non Keil Related 

    void ComOutChar(unsigned char OutData)
{
        SBUF = OutData;
        while(!TI);
        TI = 0;
}

    tks.

  • 0 in reply to taoist ren

    You tried single stepping in the simulator?

  • 0 in reply to Non Keil Related 

                            I = 0 ;
                        bSimulate[0] = 0x01 << I ;

                        I = 1 ;
                        bSimulate[1] = 0x01 << I;

                        I = 2 ;
                        bSimulate[2] = 0x01 << I;

                        I = 3 ;
                        bSimulate[3] = 0x01 << I;

                        I = 4 ;
                        bSimulate[4] = 0x01 << I;

                        I = 5 ;
                        bSimulate[5] = 0x01 << I;

                        I = 6 ;
                        bSimulate[6] = 0x01 << I;

                        I = 7 ;
                        bSimulate[7] = 0x01 << I;

                        for( I = 0 ;I < 8;I ++)
                        {
//                              bSimulate[I] = 0x01 << I ;
                                ComOutChar( bSimulate[I] );
                        }

    result:01 02 04 08 10 20 40 80

                            I = 0 ;
                        bSimulate[I] = 0x01 << I ;

                        I = 1 ;
                        bSimulate[I] = 0x01 << I;

                        I = 2 ;
                        bSimulate[I] = 0x01 << I;

                        I = 3 ;
                        bSimulate[I] = 0x01 << I;

                        I = 4 ;
                        bSimulate[I] = 0x01 << I;

                        I = 5 ;
                        bSimulate[I] = 0x01 << I;

                        I = 6 ;
                        bSimulate[I] = 0x01 << I;

                        I = 7 ;
                        bSimulate[I] = 0x01 << I;

                        for( I = 0 ;I < 8;I ++)
                        {
//                              bSimulate[I] = 0x01 << I ;
                                ComOutChar( bSimulate[I] );
                        }

    result:00 00 00 00 00 00 00 00

    unsigned char J;
                        I = 0 ;
                        J = 0 ;
                        bSimulate[J] = 0x01 << I ;

                        I = 1 ;
                        J = 1 ;
                        bSimulate[J] = 0x01 << I;

                        I = 2 ;
                        J = 2 ;
                        bSimulate[J] = 0x01 << I;

                        I = 3 ;
                        bSimulate[I] = 0x01 << I;

                        I = 4 ;
                        bSimulate[I] = 0x01 << I;

                        I = 5 ;
                        bSimulate[I] = 0x01 << I;

                        I = 6 ;
                        bSimulate[I] = 0x01 << I;

                        I = 7 ;
                        bSimulate[I] = 0x01 << I;

                        for( I = 0 ;I < 8;I ++)
                        {
//                              bSimulate[I] = 0x01 << I ;
                                ComOutChar( bSimulate[I] );
                        }

    result:80 80 80 00 00 00 00 00

    tks

  • 0 in reply to taoist ren

    Why is bSimulate declared static?

    What does the assembly that the compiler generates look like? I often find that looking at the assembly listing gives a lot of good information to help with debugging.