sd_log.c

   1 #include <string.h>
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4 #include <aversive/pgmspace.h>
   5
   6 #include "fat.h"
   7 #include "fat_config.h"
   8 #include "partition.h"
   9 #include "sd_raw.h"
  10 #include "sd_raw_config.h"
  11 #include "sd_log.h"
  12
  13 static struct fat_file_struct *log_fd = NULL;
  14
  15 static uint8_t find_file_in_dir(struct fat_fs_struct* fs,
  16         struct fat_dir_struct* dd, const char* name,
  17         struct fat_dir_entry_struct* dir_entry)
  18 {
  19         (void)fs;
  20
  21         while(fat_read_dir(dd, dir_entry)) {
  22                 if(strcmp(dir_entry->long_name, name) == 0) {
  23                         fat_reset_dir(dd);
  24                         return 1;
  25                 }
  26         }
  27
  28         return 0;
  29 }
  30
  31 static struct fat_file_struct *open_file_in_dir(struct fat_fs_struct* fs,
  32         struct fat_dir_struct* dd, const char* name)
  33 {
  34         struct fat_dir_entry_struct file_entry;
  35
  36         if(!find_file_in_dir(fs, dd, name, &file_entry))
  37                 return 0;
  38
  39         return fat_open_file(fs, &file_entry);
  40 }
  41
  42 /* open the log file on the SD card */
  43 int8_t sd_log_open(void)
  44 {
  45         struct fat_file_struct *fd;
  46         struct fat_fs_struct *fs;
  47         struct partition_struct *partition ;
  48         struct fat_dir_struct *dd;
  49         struct fat_dir_entry_struct directory;
  50         struct fat_dir_entry_struct file_entry;
  51         int16_t i = 0;
  52         char name[16];
  53
  54         /* setup sd card slot */
  55         if (!sd_raw_init()) {
  56 #if SD_DEBUG
  57                 printf_P(PSTR("MMC/SD initialization failed\n"));
  58 #endif
  59                 return -1;
  60         }
  61
  62         /* open first partition */
  63         partition = partition_open(sd_raw_read,
  64                 sd_raw_read_interval,
  65 #if SD_RAW_WRITE_SUPPORT
  66                 sd_raw_write, sd_raw_write_interval,
  67 #else
  68                 0, 0,
  69 #endif
  70                 0);
  71
  72         if (!partition) {
  73                 /* If the partition did not open, assume the storage device
  74                  * is a "superfloppy", i.e. has no MBR.
  75                  */
  76                 partition = partition_open(sd_raw_read,
  77                         sd_raw_read_interval,
  78 #if SD_RAW_WRITE_SUPPORT
  79                         sd_raw_write,
  80                         sd_raw_write_interval,
  81 #else
  82                         0,
  83                         0,
  84 #endif
  85                         -1);
  86                 if (!partition) {
  87 #if SD_DEBUG
  88                         printf_P(PSTR("opening partition failed\n"));
  89 #endif
  90                         return -1;
  91                 }
  92         }
  93
  94         /* open file system */
  95         fs = fat_open(partition);
  96         if (!fs) {
  97 #if SD_DEBUG
  98                 printf_P(PSTR("opening filesystem failed\n"));
  99 #endif
 100                 return -1;
 101         }
 102
 103         /* open root directory */
 104         fat_get_dir_entry_of_path(fs, "/", &directory);
 105         dd = fat_open_dir(fs, &directory);
 106         if (!dd) {
 107 #if SD_DEBUG
 108                 printf_P(PSTR("opening root directory failed\n"));
 109 #endif
 110                 return -1;
 111         }
 112
 113         printf("choose log file name\n");
 114         while (1) {
 115                 snprintf(name, sizeof(name), "log%.4d", i++);
 116                 if (!find_file_in_dir(fs, dd, name, &file_entry))
 117                         break;
 118         }
 119
 120         printf("create log file %s\n", name);
 121         if (!fat_create_file(dd, name, &file_entry)) {
 122                 printf_P(PSTR("error creating file: "));
 123         }
 124
 125         fd = open_file_in_dir(fs, dd, name);
 126         if (!fd) {
 127                 printf_P(PSTR("error opening "));
 128                 return -1;
 129         }
 130
 131         return 0;
 132 }
 133
 134 /* log output */
 135 intptr_t sd_log_write(const void *buffer, uintptr_t buffer_len)
 136 {
 137         if (log_fd == NULL)
 138                 return -1;
 139
 140         return fat_write_file(log_fd, buffer, buffer_len);
 141 }
 142
 143 uint8_t sd_log_enabled(void)
 144 {
 145         return log_fd != NULL;
 146 }