main.c

语音信号加密

#include <c8051f020.h>                 // SFR declarations
sbit txen=P3^3;
void SYS_Init (void);

void main (void) {
 
   SYS_Init ();                     // initialize oscillator
   txen=0;
   while (1);
}

void SYS_Init (void)
{
   int i;                              // delay counter

   OSCXCN = 0x67;  
                       // start external oscillator 
   for (i=0; i < 256; i++) ;           // XTLVLD blanking interval (>1ms)

   while (!(OSCXCN & 0x80)) ;          // Wait for crystal osc. to settle

   OSCICN = 0x88;   
   WDTCN = 0xde;                       // disable watchdog timer
   WDTCN = 0xad;                       // select external oscillator as SYSCLK
   XBR0=0;                             // source and enable missing clock
   XBR1=0;                             // detector
   XBR2=0x40;
   P0MDOUT=0xFF;
   P1MDOUT=0xFF;
   P2MDOUT=0xFF;
   P3MDOUT=0xFF;
   P1MDIN=0xFF;
   WDTCN = 0xff;
   WDTCN = 0xa5;
   
   ET1=1;
   PT1=1;
   EA=1;
   }