avr/cmd_date.c

   1 /*
   2  * (C) Copyright 2001
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 /*
   9  * RTC, Date & Time support: get and set date & time
  10  */
  11 #include <common.h>
  12 #include <string.h>
  13 #include <avr/pgmspace.h>
  14 #include <command.h>
  15 #include <rtc.h>
  16 #include <i2c.h>
  17
  18
  19 static const char * const weekdays[] = {
  20         "Sun", "Mon", "Tues", "Wednes", "Thurs", "Fri", "Satur",
  21 };
  22
  23 int mk_date (const char *, struct rtc_time *);
  24
  25 command_ret_t do_date(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  26 {
  27         struct rtc_time tm;
  28         int rcode = CMD_RET_SUCCESS;
  29
  30         (void) cmdtp; (void) flag;
  31
  32         switch (argc) {
  33         case 2:                 /* set date & time */
  34                 if (strcmp_P(argv[1],PSTR("reset")) == 0) {
  35                         my_puts_P(PSTR("Reset RTC...\n"));
  36                         rtc_reset ();
  37                 } else {
  38                         /* initialize tm with current time */
  39                         rcode = rtc_get (&tm);
  40
  41                         if(!rcode) {
  42                                 /* insert new date & time */
  43                                 if (mk_date (argv[1], &tm) != 0) {
  44                                         my_puts_P(PSTR("## Bad date format\n"));
  45                                         break;
  46                                 }
  47                                 /* and write to RTC */
  48                                 rcode = rtc_set (&tm);
  49                                 if(rcode)
  50                                         my_puts_P(PSTR("## Set date failed\n"));
  51                         } else {
  52                                 my_puts_P(PSTR("## Get date failed\n"));
  53                         }
  54                 }
  55                 /* FALL TROUGH */
  56         case 1:                 /* get date & time */
  57                 rcode = rtc_get (&tm);
  58
  59                 if (rcode) {
  60                         my_puts_P(PSTR("## Get date failed\n"));
  61                         break;
  62                 }
  63                 /* TODO: flash */
  64                 printf_P(PSTR("Date: %4d-%02d-%02d (%sday)    Time: %2d:%02d:%02d\n"),
  65                         tm.tm_year, tm.tm_mon, tm.tm_mday,
  66                         (tm.tm_wday<0 || tm.tm_wday>6) ?
  67                                 "unknown " : weekdays[tm.tm_wday],
  68                         tm.tm_hour, tm.tm_min, tm.tm_sec);
  69
  70                 break;
  71         default:
  72                 rcode = CMD_RET_USAGE;
  73         }
  74
  75         return rcode;
  76 }
  77
  78 /*
  79  * simple conversion of two-digit string with error checking
  80  */
  81 static int cnvrt2 (const char *str, int *valp)
  82 {
  83         int val;
  84
  85         if ((*str < '0') || (*str > '9'))
  86                 return (-1);
  87
  88         val = *str - '0';
  89
  90         ++str;
  91
  92         if ((*str < '0') || (*str > '9'))
  93                 return (-1);
  94
  95         *valp = 10 * val + (*str - '0');
  96
  97         return (0);
  98 }
  99
 100 /*
 101  * Convert date string: MMDDhhmm[[CC]YY][.ss]
 102  *
 103  * Some basic checking for valid values is done, but this will not catch
 104  * all possible error conditions.
 105  */
 106 int mk_date (const char *datestr, struct rtc_time *tmp)
 107 {
 108         int len, val;
 109         char *ptr;
 110
 111         ptr = strchr (datestr,'.');
 112         len = strlen (datestr);
 113
 114         /* Set seconds */
 115         if (ptr) {
 116                 int sec;
 117
 118                 *ptr++ = '\0';
 119                 if ((len - (ptr - datestr)) != 2)
 120                         return (-1);
 121
 122                 len = strlen (datestr);
 123
 124                 if (cnvrt2 (ptr, &sec))
 125                         return (-1);
 126
 127                 tmp->tm_sec = sec;
 128         } else {
 129                 tmp->tm_sec = 0;
 130         }
 131
 132         if (len == 12) {                /* MMDDhhmmCCYY */
 133                 int year, century;
 134
 135                 if (cnvrt2 (datestr+ 8, &century) ||
 136                     cnvrt2 (datestr+10, &year) ) {
 137                         return (-1);
 138                 }
 139                 tmp->tm_year = 100 * century + year;
 140         } else if (len == 10) {         /* MMDDhhmmYY   */
 141                 int year, century;
 142
 143                 century = tmp->tm_year / 100;
 144                 if (cnvrt2 (datestr+ 8, &year))
 145                         return (-1);
 146                 tmp->tm_year = 100 * century + year;
 147         }
 148
 149         switch (len) {
 150         case 8:                 /* MMDDhhmm     */
 151                 /* fall thru */
 152         case 10:                /* MMDDhhmmYY   */
 153                 /* fall thru */
 154         case 12:                /* MMDDhhmmCCYY */
 155                 if (cnvrt2 (datestr+0, &val) ||
 156                     val > 12) {
 157                         break;
 158                 }
 159                 tmp->tm_mon  = val;
 160                 if (cnvrt2 (datestr+2, &val) ||
 161                     val > ((tmp->tm_mon==2) ? 29 : 31)) {
 162                         break;
 163                 }
 164                 tmp->tm_mday = val;
 165
 166                 if (cnvrt2 (datestr+4, &val) ||
 167                     val > 23) {
 168                         break;
 169                 }
 170                 tmp->tm_hour = val;
 171
 172                 if (cnvrt2 (datestr+6, &val) ||
 173                     val > 59) {
 174                         break;
 175                 }
 176                 tmp->tm_min  = val;
 177
 178                 /* calculate day of week */
 179                 GregorianDay (tmp);
 180
 181                 return (0);
 182         default:
 183                 break;
 184         }
 185
 186         return (-1);
 187 }
 188