root/platform/n/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"
   6 extern long link_bss_start;
   7 extern long link_bss_end;
   8 extern void boot();
  10 void startup() {
  11     long *bss = &link_bss_start;
  13     // sanity check
  14     if ((long)&link_bss_end > (MEMISOSTART + MEMISOSIZE)) {
started();
shutdown();
  17     }
  18     // initialize .bss senment
  19     while (bss<&link_bss_end)
  20         *bss++ = 0;
boot();
  23 }
  25 // Focus length table - found by found scanning memory for 1st table entry : 0x88 0x13 0x00 0x00   0x64 0x00 0x00 0x00 ( 5000 100 decimal )
  26 // Conversion factor lens FL --> 35mm equiv
  27 // from Canon specs :  5.0 (W) - 40.0 (T) mm (35mm film equivalent: 28 (W) - 224 (T) mm)
  28 // lens      35mm     CF
  29 // ----      ----     --
  30 //  5.0      28      ( 28/ 5.0) * 50 = 280  (min FL)
  31 // 40.0     224      (224/40.0) * 50 = 280  (max FL)
  32 #define CF_EFL      280
  33 #define CF_EFL_DIV  50
  34 #define NUM_FL      128   // 0 - 63 entries in firmware 
  35 #define NUM_DATA    2     // 2 words each entry, first is FL
  36 extern int focus_len_table[NUM_FL*NUM_DATA];
  38 const int zoom_points = NUM_FL;
  40 int get_effective_focal_length(int zp) {
  41     return (CF_EFL*get_focal_length(zp))/CF_EFL_DIV;
  42 }
  44 int get_focal_length(int zp) {
  45     if (zp < 0) zp = 0;
  46     else if (zp >= NUM_FL) zp = NUM_FL-1;
  47     return focus_len_table[zp*NUM_DATA];
  48 }
  50 int get_zoom_x(int zp) {
  51     return get_focal_length(zp)*10/focus_len_table[0];
  52 }
  54 long get_vbatt_min()
  55 {
  56     return 3200;   // powershot N
  57 }
  59 long get_vbatt_max()
  60 {
  61     return 4000;   // powershot N
  62 }