/* DEMO5 : INT_CHAN_0 & INT_CHAN_1 timer interrupt demo           */
/*         (It is designed to be a machine independent timer)     */
/* step1 : Run DEMO5.EXE                                          */
/* -------------------------------------------------------------- */
#include "PIO.H"

#define A1_8259 0x20
#define A2_8259 0xA0
#define EOI     0x20

static void interrupt irq_service();
void pio_da16_c0(char cConfig, char cLow, char cHigh);
void pio_da16_c1(char cConfig, char cLow, char cHigh);
void pio_da16_c2(char cConfig, char cLow, char cHigh);
void init_high();

WORD wBase,wIrq;
int  irqmask,now_int_state,new_int_state,int_c;
int  INT0_L,INT0_H,INT1_L,INT1_H;
int  b0,b1,invert;

int main()
{
int   i,j;
WORD  wBoards,wRetVal,t1,t2,t3,t4,t5,t6;
WORD  wSubVendor,wSubDevice,wSubAux,wSlotBus,wSlotDevice;

clrscr();

/* step1 : find address-mapping of PIO/PISO cards                 */
wRetVal=PIO_DriverInit(&wBoards,0x80,0x04,0x00);/*for PIO-DA16/8/4*/
printf("\n(1) Threr are %d PIO-DA16/8/4 Cards in this PC",wBoards);
if ( wBoards==0 )  exit(0);

printf("\n\n-------------- The Configuration Space --------------");
for(i=0;i<wBoards;i++)
   {
   PIO_GetConfigAddressSpace(i,&wBase,&wIrq,&wSubVendor,&wSubDevice,&wSubAux,&wSlotBus,&wSlotDevice);

   printf("\nCard_%d: wBase=%x,wIrq=%x,subID=[%x,%x,%x],SlotID=[%x,%x]",i,wBase,wIrq,wSubVendor,wSubDevice,wSubAux,wSlotBus,wSlotDevice);

   printf(" --> ");
   ShowPioPiso(wSubVendor,wSubDevice,wSubAux);
   }

PIO_GetConfigAddressSpace(0,&wBase,&wIrq,&t1,&t2,&t3,&t4,&t5);
                                                 /* select card_0 */
/* step2 : enable all D/I/O port                                  */
outportb(wBase,1);                                /* /RESET -> 1  */

printf("\n\n(2) DEMO5 Interrupt test");

init_high();    /* interrupt initialize, INT_CHAN_0/1 is high now */
printf("\n\n*** Show the count of Low_pulse ***\n");
INT0_L=INT0_H=INT1_L=INT1_H=0;
for (;;)
    {
    gotoxy(1,10);
    printf("\nINT0[%x,%x],INT1[%x,%x]",INT0_H,INT0_L,INT1_H,INT1_L);
    if (kbhit()!=0) break;
    }

outportb(wBase+5,0);                     /* disable all interrupt */
PIO_DriverClose();
}

/* Use INT_CHAN_0 & INT_CHAN_1 as internal interrupt signal       */
void init_high()
{
DWORD dwVal;

disable();

outportb(wBase+5,0);                     /* disable all interrupt */

if (wIrq<8)
   {
   irqmask=inportb(A1_8259+1);
   outportb(A1_8259+1,irqmask & (0xff ^ (1 << wIrq)));
   setvect(wIrq+8, irq_service);
   }
else
   {
   irqmask=inportb(A1_8259+1);
   outportb(A1_8259+1,irqmask & 0xfb);                    /* IRQ2 */
   irqmask=inportb(A2_8259+1);
   outportb(A2_8259+1,irqmask & (0xff ^ (1 << (wIrq-8))));
   setvect(wIrq-8+0x70, irq_service);
   }

/* CLK source = 4 MHz */
pio_da16_c0(0x36,0x20,0x4e);       /* COUNTER0, mode3, div 20000  */
                                   /* program Cout0 200Hz         */
pio_da16_c1(0x76,0x90,0x01);       /* COUNTER1, mode3, div  400   */
pio_da16_c2(0xb6,0x64,0x00);       /* COUNTER2, mode3, div  100   */
                                   /* program Cout2 100Hz         */

/* note : the 8254 need extra 2-clock for initialization          */
for (;;)
    {
    if ((inportb(wBase+7)&3)==3) break;/* wait Cout0&Cout2 = high */
    }

/* note : Cout0/2 = high, INV0/1 must select the inverted Cout0/2 */
/*        --> INT_CHAN_0 = !Cout0 = init_low, active_high         */
/*        --> INT_CHAN_1 = !Cout2 = init_low, active_high         */
outportb(wBase+0x2a,0);          /* INV0=0, INV1=0 inverted       */

now_int_state=3;                 /* now Cout0 & Cout2 is high     */
outportb(wBase+5,3);             /* enable INT_CHAN_0/1 interrupt */
enable();
}

/* -------------------------------------------------------------- */
/* Note : 1.The hold_time of INT_CHAN_0 & INT_CHAN_1 must long    */
/*          enoug.                                                */
/*        2.The ISR must read the interrupt status again to       */
/*          identify the active interrupt source.                 */
/*        3.The INT_CHAN_0 & INT_CHAN_1 can be active at the same */
/*          time.                                                 */
/* -------------------------------------------------------------- */
void interrupt irq_service()
{
/* now ISR can not know which interrupt is active                 */
new_int_state=inportb(wBase+7)&0x03;      /* read all interrupt   */
                                          /* signal state         */
int_c=new_int_state^now_int_state;        /* compare new_state to */
                                          /* old_state            */

if ((int_c&0x01)==1)             /* INT_CHAN_0 is active          */
   {
   if ((new_int_state&1)==0)     /* INT0 change to low now        */
      {
      INT0_L++;
      }
   else                          /* INT0 change to high now       */
      {
      INT0_H++;
      }
   invert=invert^1;              /* generate high_pulse           */
   }

if ((int_c&0x02)==2)             /* INT_CHAN_1 is active          */
   {
   if ((new_int_state&2)==0)     /* INT1 change to low now        */
      {
      INT1_L++;
      }
   else                          /* INT1 change to high now       */
      {
      INT1_H++;
      }
   invert=invert^2;              /* generate high_pulse           */
   }

now_int_state=new_int_state;     /* update interrupt status       */
outportb(wBase+0x2a,invert);     /* generate a high pulse         */

if (wIrq>=8) outportb(A2_8259,0x20);
outportb(A1_8259,0x20);
}

/* -------------------------------------------------------------- */
void pio_da16_c0(char cConfig, char cLow, char cHigh) /* COUNTER0 */
{
outportb(wBase+0xcc,cConfig);
outportb(wBase+0xc0,cLow);
outportb(wBase+0xc0,cHigh);
}

void pio_da16_c1(char cConfig, char cLow, char cHigh) /* COUNTER1 */
{
outportb(wBase+0xcc,cConfig);
outportb(wBase+0xc4,cLow);
outportb(wBase+0xc4,cHigh);
}

void pio_da16_c2(char cConfig, char cLow, char cHigh) /* COUNTER2 */
{
outportb(wBase+0xcc,cConfig);
outportb(wBase+0xc8,cLow);
outportb(wBase+0xc8,cHigh);
}