ADLINK Technology CM1-86DX2, Техническое руководство

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60 Using the Module
Watchdog1 Example
#include < sys / io . h >
#include < stdio . h >
int main ()
{
unsigned int wdog_time = ( 0x20L * 0x500L );
unsigned char trig = 0 ,
wdog_en = 0 ,
reset_cntr = 0 ;
if ( iopl ( 3 ) != 0 )
{
printf ( "IOPL error \ n" );
return 1 ;
}
//set time counter register: 0xac, 0xab, 0xaa
outb (( wdog_time >> 16 ) & 0xFF , 0xac ); //D23...D16
outb (( wdog_time >> 8 ) & 0xFF , 0xab ); //D15...D8
outb ( wdog_time & 0xFF , 0xaa ); //D7...D0
//set trigger: 0xa9
trig = inb ( 0xa9 );
trig &= 0x0F ;
trig |= 0xD0 ; //0xD0 = system reset
outb ( trig , 0xa9 );
//enable wdog: 0xa8
wdog_en = inb ( 0xa8 );
wdog_en |= 0x40 ; //bit6 = 1 --> enable WDT1
outb ( wdog_en , 0xa8 );
printf ( "Watchdog active , resetting counter , Press CTRL + C to stop resetting \ n" );
//reset timer counter : 0xa8
while ( 1 )
{
reset_cntr = inb ( 0xa8 );
reset_cntr |= 0x40 ; //bit6 = 1 --> reset counter
outb ( reset_cntr , 0xa8 );
}
return 0 ;
}
Please note that this source code example is provided for a system running Linux. For
other operating systems, it may be necessary to adapt the source code regarding include
files or headers and the syntax of I/O out commands because Linux is using outb(value,
address) instead of outb(address, value).