inportb and outportb are the two old c function. Is this two function supportted by CVI or is there a substitute for this

[gajendra]

I am trying to import / convert an old c code to LabWindows CVI. I am not sure wether the inportb and outportb function are supported. The error I get is "Missing Prototype".

Here is the sample code. below.

/************************************************************************=
**********
* Name:      Enable_Receive_Interrupts_COMM1
* Function:  Sets the 8250 and 8259 registers to receive data
*************************************************************************=
**********/

void Enable_Receive_Interrupts_COMM1(void)
  {
    unsigned char tempbyte;
    tempbyte =  inportb(LSR_1);
    tempbyte = inportb(INTCL);  /* 8259 interupt mask register */
    tempbyte =tempbyte & 0xef;
    outportb(INTCL,tempbyte);

    tempbyte =   inportb(LCR_1);
    outportb(LCR_1,(tempbyte & 0x7F));

    tempbyte =   inportb(LCR_1);  /* 8250 line control register */
    tempbyte =  tempbyte & 0x7f;
    outportb(LCR_1, tempbyte);

    outportb(IER_1,0x01);         /* 8250 interrupt enable register */
    outportb(MCR_1,0x08);       /* 8250 modem control register */
    outportb(MSR_1,0x80);       /* 8250 modem status register */
    outportb(0x20,0x20);        /* 8259 interupt control register */
    tempbyte =   inportb(MSR_1);

    tempbyte =   inportb(DATAPORT_1);
    tempbyte =   inportb(DATAPORT_1);
  }

Thanks all

[Wolfgang]

Hi,

the reason for your error is that the functions inportb() outportb() are not standard C library functions.

However there are similar low level functions in CVI, they are called inp and outp, an example for their use can be found here