root/platform/ixus220_elph300hs/main.c

DEFINITIONS

1. startup
2. get_effective_focal_length
3. get_focal_length
4. get_zoom_x
5. get_vbatt_min
6. get_vbatt_max

   1 #include "lolevel.h"
   2 #include "platform.h"
   3 #include "core.h"
   4 #include "keyboard.h"
   7 extern long link_bss_start;
   8 extern long link_bss_end;
   9 extern void boot();
  12 void startup()
  13 {
  15         long *bss = &link_bss_start;
  17         // sanity check
  18         if ((long)&link_bss_end > (MEMISOSTART + MEMISOSIZE)){
started();
shutdown();
  21         }
  23         // initialize .bss senment
  24         while (bss<&link_bss_end)
  25                 *bss++ = 0;
boot();
  28 }
  30 // Focus length table in firmware @0xfffea288
  31 #define NUM_FL      64  // 0 - 63, entries in firmware
  32 #define NUM_DATA    3   // 3 words each entry, first is FL
  33 extern int focus_len_table[NUM_FL*NUM_DATA];
  35 // Conversion factor lens FL --> 35mm equiv
  36 // lens      35mm     CF
  37 // ----      ----     --
  38 // 4.3       24       ( 24/ 4.3) * 43 = 240  (min FL)
  39 // 21.5      120      (120/21.5) * 43 = 240  (max FL)
  40 #define CF_EFL      240
  41 #define CF_EFL_DIV  43
  43 const int zoom_points = NUM_FL;
  45 int get_effective_focal_length(int zp) {
  46     return (CF_EFL*get_focal_length(zp))/CF_EFL_DIV;
  47 }
  49 int get_focal_length(int zp) {
  50     if (zp < 0) zp = 0;
  51     else if (zp >= NUM_FL) zp = NUM_FL-1;
  52     return focus_len_table[zp*NUM_DATA];
  53 }
  55 int get_zoom_x(int zp) {
  56     return get_focal_length(zp)*10/focus_len_table[0];
  57 }
  59 long get_vbatt_min()
  60 {
  61         return 3280;  // min observed was 3.408, then it died
  62 }
  64 long get_vbatt_max()
  65 {
  66         return 4057;  // fresh from change (actual was 4.127)
  67 }