Set a bit

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originally posted by pmicro@Mar 13 2006, 10:53 AM

hi

in my statement i declare

static alt_u8 count ;//8 digital input

static alt_u8 mem;# define bit0 count&0x01 //first bit of byte count # define fp mem&0x01 //first bit of byte mem # define true 1# define false 0

if ((bit0 ) & (!fp)

{

//.....make something

fp=1;

}

if(!bit0)

{

fp=0;

}

//witn this software i would like to have e positive edge on my first button input

but in during compilation i cannot assign bit0=1 or bit0=true

i don't want to use rising edge capture but use this simple sw like usually i use

in plc program

where do i make mistake ?

how can i assign a value to bit0?

thanks for ansuwers

walter

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count = count | 0x01;

This (or 0x2, 0x4, etc) will set whatever bit in the variable you want. If you&#39;re trying to set a bit on a line (like the enable to a FIFO or something) you need to use a PIO.

i made like this

typedef struct sBit

{

alt_u8 B0 :1;

alt_u8 B1 :1;

alt_u8 B2 :1;

alt_u8 B3 :1;

alt_u8 B4 :1;

alt_u8 B5 :1;

alt_u8 B6 :1;

alt_u8 B7 :1;

alt_u8 B8 :1;

alt_u8 B9 :1;

alt_u8 B10 :1;

alt_u8 B11 :1;

alt_u8 B12 :1;

alt_u8 B13 :1;

alt_u8 B14 :1;

alt_u8 B15 :1;

}sBit;

typedef union sDato // Una Union differisce dalla struct per il fatto che il dato e&#39; condiviso

{

alt_u8 W;

sBit B;

}sDato;

sDato count;

sDato mem;

.....

.....

while(1)

{

count.W=IORD_ALTERA_AVALON_PIO_DATA(PM_IN_BASE);

if(count.B.B0) & (!mem.B.B0)

{

//execute code

mem.B.B0=true;

}

if(!count.B.B0)

{

mem.B.B0=false;

}

}

//now it&#39;s functionally

ciao

walter