root/platform/sx210is/main.c

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DEFINITIONS

This source file includes following 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"
   5 
   6 
   7 extern long link_bss_start;
   8 extern long link_bss_end;
   9 extern void boot();
  10 
  11 
  12 void startup()
  13 {
  14 
  15 
  16         long *bss = &link_bss_start;
  17 
  18         // sanity check
  19         if ((long)&link_bss_end > (MEMISOSTART + MEMISOSIZE)){
  20                 started();
  21                 shutdown();
  22         }
  23 
  24         // initialize .bss senment
  25         while (bss<&link_bss_end)
  26                 *bss++ = 0;
  27 
  28 
  29         boot();
  30 }
  31 
  32 
  33 //zoom position is get_parameter_data(87)
  34 
  35 // Focus length table in firmware @ 0xfffea1cc
  36 #define NUM_FL      126 // 0 - 125, entries in firmware
  37 #define NUM_DATA    3   // 3 words each entry, first is FL
  38 extern int focus_len_table[NUM_FL*NUM_DATA];
  39 
  40 // Conversion factor lens FL --> 35mm equiv
  41 // lens      35mm     CF
  42 // ----      ----     --
  43 // 5.0       28       ( 28/ 5.0) * 50 = 280  (min FL)
  44 // 70.0      392      (392/70.0) * 50 = 280  (max FL)
  45 #define CF_EFL      280
  46 #define CF_EFL_DIV  50
  47 
  48 const int zoom_points = NUM_FL;
  49 
  50 int get_effective_focal_length(int zp) {
  51     return (CF_EFL*get_focal_length(zp))/CF_EFL_DIV;
  52 }
  53 
  54 int get_focal_length(int zp) {
  55     if (zp < 0) zp = 0;
  56     else if (zp >= NUM_FL) zp = NUM_FL-1;
  57     return focus_len_table[zp*NUM_DATA];
  58 }
  59 
  60 int get_zoom_x(int zp) {
  61     return get_focal_length(zp)*10/focus_len_table[0];
  62 }
  63 
  64 long get_vbatt_min()
  65 {
  66         return 3280;  // min observed was 3.408, then it died
  67 }
  68 
  69 long get_vbatt_max()
  70 {
  71         return 4057;  // fresh from change (actual was 4.127)
  72 }

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