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Software watchdog softdog.c

Publisher:温柔之风Latest update time:2017-11-29 Source: eefocusKeywords：softdog.c Reading articles on mobile phones Scan QR code
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汇编
ERRORP SEGMENT CODE
PUBLIC error
RSEG ERRORP
error:
CLR EA
MOV DPTR,#ERR1
PUSH DPL
PUSH DPH
RETI
ERR1:
CLR A
PUSH ACC
PUSH ACC
RETI
END

//The following program is just an example 

void error(void);

//Timer 0, clear the timing of timer 1
void int_t0(void) interrupt 1 {
TL0=TL0+68;TH0=0xfd; //700
TH1=0xfb;
}
//Timer 1, interrupt as watchdog
void int_t1(void) interrupt 3 {
error(); //reset
}

unsigned char adds;
unsigned char b_job0[5][3]; //Data used by job0, such as data collected by A/D, a total of 5 groups, 3 in each group, one of which is valid and the other 2 are spare
unsigned char b_job1[5][3];    
unsigned char b_job2[5][3];

void job0(void) {
unsigned char i;
adds=0;
for (i=0;i<5;i++) { //Data collection part, the process is simplified here
  b_job0[i][0]=b_job0[i][1]=b_job0[i][2]=123;
}
while (1) {}
}
void job1(void) {
unsigned char i;
adds=1;
for (i=0;i<5;i++) { //Data collection part, the process is simplified here
  b_job0[i][0]=b_job0[i][1]=b_job0[i][2]=23;
}
while (1) {}
}
void job2(void) {
unsigned char i;
adds=2;
for (i=0;i<5;i++) { //Data collection part, the process is simplified here
  b_job0[i][0]=b_job0[i][1]=b_job0[i][2]=12;
}
while (1) {}
}

//In order not to clear b_power when resetting, it must be connected with nostart.obj when connecting
void main(void) {
unsigned int b_power;
unsigned char b_test_ram,i,j;
TMOD=0x11;
TH0=0xfd;TH1=0xfb;
ET0=TR0=1;
ET1=TR1=1;
EA=1;
if (b_power!=0x1234) { //b_power is not equal to 0x1234, which means it has just been turned on
  b_power=0x1234;
  adds=0; //First execution of job0
} else { //Software reset handler, mainly continues to execute according to the address that generates the reset
      //RAM data error detection and recovery, 2 out of 3 equal method
  for (i=0;i<5;i++) {
  for (j=0;j<2;j++) {
   b_test_ram=job0[i][j];
   if (b_test_ram==job0[i][j+1]) break;
   b_test_ram=job0[i][j+1];
  }
  if (j==2) break;
  }
  if (i!=5) {}//Error in processing job0 data

  for (i=0;i<5;i++) {
  for (j=0;j<2;j++) {
   b_test_ram=job1[i][j];
   if (b_test_ram==job1[i][j+1]) break;
   b_test_ram=job1[i][j+1];
  }
  if (j==2) break;
  }
  if (i!=5) {}//处理job1数据出错

  for (i=0;i<5;i++) {
  for (j=0;j<2;j++) {
   b_test_ram=job2[i][j];
   if (b_test_ram==job2[i][j+1]) break;
   b_test_ram=job2[i][j+1];
  }
  if (j==2) break;
  }
  if (i!=5) {}//处理job2数据出错

  switch (adds) {
  case 0:job0();break;
  case 1:job1();break;
  case 2:job2();break;
  }
}
while (1) {}
}


Keywords：softdog.c Reference address：Software watchdog softdog.c

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