u-boot修改main.c实现bootloader里喂狗

#include "../board/cnxt/common/dc_sdkport.h"
#include "../board/cnxt/common/dc_radef_common.h"
#include "../board/cnxt/common/ra_gp.h"
#include "../board/cnxt/common/radef.h"
#include <common.h>
//#include <watchdog.h>
#include <command.h>
#ifdef CONFIG_MODEM_SUPPORT
#include <malloc.h>  /* for free() prototype */
#endif

#ifdef CONFIG_SYS_HUSH_PARSER
#include <hush.h>
#endif

#include <post.h>

 

void WATCHDOG_RESET(void)
{
    //int i=0;
    regwr(RA_GP_OUTPUT0_P,dcreg(RA_GP_OUTPUT0_P)|0x10);
    udelay(10);
    regwr(RA_GP_OUTPUT0_P,dcreg(RA_GP_OUTPUT0_P)&~0x10);
// printf("wd_reset\n");
}

 

static int cread_line(const char *const prompt, char *buf, unsigned int *len)
{
      unsigned long dog_time=0;
 unsigned long num = 0;
 unsigned long eol_num = 0;
 unsigned long wlen;
 char ichar;
 int insert = 1;
 int esc_len = 0;
 char esc_save[8];
 int init_len = strlen(buf);    
 if (init_len)
  cread_add_str(buf, init_len, 1, &num, &eol_num, buf, *len);

 while (1) {
 // printf("gecmd_getch() -1\n");
  if(tstc())                                 //---------------------检测有没有输入
  ichar = getcmd_getch();
  else                                      //----------------------无输入的时候
   {
   
  dog_time++;
  if(dog_time>=100000)
  {
      dog_time=0;
                 WATCHDOG_RESET();
   }
  continue;
   }
          //  printf("getcmd_getch() -2\n");
  if ((ichar == '\n') || (ichar == '\r')) {
   putc('\n');
   break;
  }

  /*
   * handle standard linux xterm esc sequences for arrow key, etc.
   */
  if (esc_len != 0) {
   if (esc_len == 1) {
    if (ichar == '[') {
     esc_save[esc_len] = ichar;
     esc_len = 2;
    } else {
     cread_add_str(esc_save, esc_len, insert,
            &num, &eol_num, buf, *len);
     esc_len = 0;
    }
    continue;
   }

   switch (ichar) {

   case 'D': /* <- key */
    ichar = CTL_CH('b');
    esc_len = 0;
    break;
   case 'C': /* -> key */
    ichar = CTL_CH('f');
    esc_len = 0;
    break; /* pass off to ^F handler */
   case 'H': /* Home key */
    ichar = CTL_CH('a');
    esc_len = 0;
    break; /* pass off to ^A handler */
   case 'A': /* up arrow */
    ichar = CTL_CH('p');
    esc_len = 0;
    break; /* pass off to ^P handler */
   case 'B': /* down arrow */
    ichar = CTL_CH('n');
    esc_len = 0;
    break; /* pass off to ^N handler */
   default:
    esc_save[esc_len++] = ichar;
    cread_add_str(esc_save, esc_len, insert,
           &num, &eol_num, buf, *len);
    esc_len = 0;
    continue;
   }
  }

  switch (ichar) {
  case 0x1b:
   if (esc_len == 0) {
    esc_save[esc_len] = ichar;
    esc_len = 1;
   } else {
    puts("impossible condition #876\n");
    esc_len = 0;
   }
   break;

  case CTL_CH('a'):
   BEGINNING_OF_LINE();
   break;
  case CTL_CH('c'): /* ^C - break */
   *buf = '\0'; /* discard input */
   return (-1);
  case CTL_CH('f'):
   if (num < eol_num) {
    getcmd_putch(buf[num]);
    num++;
   }
   break;
  case CTL_CH('b'):
   if (num) {
    getcmd_putch(CTL_BACKSPACE);
    num--;
   }
   break;
  case CTL_CH('d'):
   if (num < eol_num) {
    wlen = eol_num - num - 1;
    if (wlen) {
     memmove(&buf[num], &buf[num+1], wlen);
     putnstr(buf + num, wlen);
    }

    getcmd_putch(' ');
    do {
     getcmd_putch(CTL_BACKSPACE);
    } while (wlen--);
    eol_num--;
   }
   break;
  case CTL_CH('k'):
   ERASE_TO_EOL();
   break;
  case CTL_CH('e'):
   REFRESH_TO_EOL();
   break;
  case CTL_CH('o'):
   insert = !insert;
   break;
  case CTL_CH('x'):
  case CTL_CH('u'):
   BEGINNING_OF_LINE();
   ERASE_TO_EOL();
   break;
  case DEL:
  case DEL7:
  case 8:
   if (num) {
    wlen = eol_num - num;
    num--;
    memmove(&buf[num], &buf[num+1], wlen);
    getcmd_putch(CTL_BACKSPACE);
    putnstr(buf + num, wlen);
    getcmd_putch(' ');
    do {
     getcmd_putch(CTL_BACKSPACE);
    } while (wlen--);
    eol_num--;
   }
   break;
  case CTL_CH('p'):
  case CTL_CH('n'):
  {
   char * hline;

   esc_len = 0;

   if (ichar == CTL_CH('p'))
    hline = hist_prev();
   else
    hline = hist_next();

   if (!hline) {
    getcmd_cbeep();
    continue;
   }

   /* nuke the current line */
   /* first, go home */
   BEGINNING_OF_LINE();

   /* erase to end of line */
   ERASE_TO_EOL();

   /* copy new line into place and display */
   strcpy(buf, hline);
   eol_num = strlen(buf);
   REFRESH_TO_EOL();
   continue;
  }
#ifdef CONFIG_AUTO_COMPLETE
  case '\t': {
   int num2, col;

   /* do not autocomplete when in the middle */
   if (num < eol_num) {
    getcmd_cbeep();
    break;
   }

   buf[num] = '\0';
   col = strlen(prompt) + eol_num;
   num2 = num;
   if (cmd_auto_complete(prompt, buf, &num2, &col)) {
    col = num2 - num;
    num += col;
    eol_num += col;
   }
   break;
  }
#endif
  default:
   cread_add_char(ichar, insert, &num, &eol_num, buf, *len);
   break;
  }
 }
 *len = eol_num;
 buf[eol_num] = '\0'; /* lose the newline */

 if (buf[0] && buf[0] != CREAD_HIST_CHAR)
  cread_add_to_hist(buf);
 hist_cur = hist_add_idx;

 return 0;
}