root/platform/ixus990_sd970/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 {
  14     long *bss = &link_bss_start;
  16    // sanity check (pointless with automemiso)
  17     if ((long)&link_bss_end > (MEMISOSTART + MEMISOSIZE)){
started();
shutdown();
  20     }
  22     // initialize .bss senment
  23     while (bss<&link_bss_end)
  24         *bss++ = 0;
boot();
  27 }
  29 // sd970: Focus length table in firmware @0xfffe2a8c (same address as sd780)
  30 #define NUM_FL      7   // 0 - 6, entries in firmware
  31 #define NUM_DATA    3   // 3 words each entry, first is FL
  32 extern int focus_len_table[NUM_FL*NUM_DATA];
  34 // sd970: Conversion factor lens FL --> 35mm equiv
  35 // lens      35mm     CF
  36 // ----      ----     --
  37 // 6.6       37       ( 37/ 6.6) * 66 = 370  (min FL)
  38 // 33.0      185      (185/33.0) * 66 = 370  (max FL)
  39 #define CF_EFL      370
  40 #define CF_EFL_DIV  66
  42 const int zoom_points = NUM_FL;
  44 int get_effective_focal_length(int zp) {
  45     return (CF_EFL*get_focal_length(zp))/CF_EFL_DIV;
  46 }
  48 int get_focal_length(int zp) {
  49     if (zp < 0) zp = 0;
  50     else if (zp >= NUM_FL) zp = NUM_FL-1;
  51     return focus_len_table[zp*NUM_DATA];
  52 }
  54 int get_zoom_x(int zp) {
  55     return get_focal_length(zp)*10/focus_len_table[0];
  56 }
  58 // sd970: These come from sd990 which has the same battery
  59 long get_vbatt_min()
  60 {
  61     return 3425; // hnikesch on forum
  62 }
  63 long get_vbatt_max()
  64 {
  65     return 4000; // fresh off charger slightly greater
  66 }