badge/fahrplan.c

   1 #include "fahrplan.h"
   2 #include "ui/browser.h"
   3
   4 #include <drivers/fatfs/ff.h>
   5 #include <stdint.h>
   6
   7 #define FAHRPLAN_PATH     "/fahrplan"
   8 #define FAHRPLAN_MENUFILE "fahrplan.lst"
   9 #define FAHRPLAN_POSFILE  "selected.dat"
  10
  11 static uint8_t badge_load_fahrplan_pos(void) {
  12   uint8_t pos = 0;
  13   FIL fd;
  14
  15   if(FR_OK == f_open(&fd, FAHRPLAN_POSFILE, FA_OPEN_EXISTING | FA_READ)) {
  16     UINT bytes;
  17     uint8_t buf;
  18     if(FR_OK == f_read(&fd, &buf, sizeof(buf), &bytes) && bytes == sizeof(buf)) {
  19       pos = buf;
  20     }
  21
  22     f_close(&fd);
  23   }
  24
  25   return pos;
  26 }
  27
  28 static void badge_save_fahrplan_pos(uint8_t pos) {
  29   FIL fd;
  30
  31   if(FR_OK == f_open(&fd, FAHRPLAN_POSFILE, FA_CREATE_ALWAYS | FA_WRITE)) {
  32     UINT bytes;
  33     f_write(&fd, &pos, sizeof(pos), &bytes);
  34     f_close(&fd);
  35   }
  36 }
  37
  38 void badge_fahrplan(void) {
  39   f_chdir(FAHRPLAN_PATH);
  40
  41   uint8_t oldpos = badge_load_fahrplan_pos();
  42   uint8_t pos = oldpos;
  43
  44   badge_browse_textfiles(FAHRPLAN_MENUFILE, &pos);
  45
  46   if(oldpos != pos) {
  47     badge_save_fahrplan_pos(pos);
  48   }
  49 }