I tried deleting all references to focusing just to prove that it was too rough an idea to work, and to my horror it bricked my camera - well ok that's a lie - it seems to work with a quick test on my desk. I can maintain macro/ close focusing based on my in initial manual focus and when the script turns the display off things seem to stay ok.
The code I trashed is below - I haven't marked it up or anything
--[[
Authors: Fraser McCrossan
Alfredo Pironti
Torben S.
Tested on G9, A2000, should work on most cameras.
An accurate intervalometer script, with pre-focus and screen power off options.
http://chdk.wikia.com/wiki/Lua/Scripts:_Accurate_Intervalometer_with_power-saving_and_pre-focus
Added on Dec 22, 2013: Fixed display off functionality to use the recently added set_lcd_display CHDK function
Features:
- input is frame interval plus total desired run-time (or "endless")
- displays frame count, frame total and remaining time after each frame
(in endless mode, displays frame count and elapsed time)
- honours the "Display" button during frame delays (so you can
get it running then turn off the display to save power)
- can turn off the display a given number of frames after starting
(might take a couple of frames longer to cycle to correct mode)
- can pre-focus before starting then go to manual focus mode
- use SET button to exit
See bottom of script for main loop.
]]
--[[
@title Time-lapse
@param s Secs/frame
@default s 3
@param h Sequence hours
@default h 0
@param m Sequence minutes
@default m 0
@param e Endless?
@default e 1
@range e 0 1
@param f Fix focus at start?
@default f 0
@range f 0 1
@param d Display off frame 0=never
@default d 3
--]]
-- convert parameters into readable variable names
secs_frame, hours, minutes, endless, focus_at_start, display_off_frame = s, h, m, (e == 1), (f == 1), d
-- sanitize parameters
if secs_frame <= 0 then
secs_frame = 1
end
if hours < 0 then
hours = 0
end
if minutes <= 0 then
minutes = 1
end
if display_off_frame < 0 then
display_off_frame = 0
end
props = require "propcase"
-- derive actual running parameters from the more human-friendly input
-- parameters
function calculate_parameters (seconds_per_frame, hours, minutes)
local ticks_per_frame = 1000 * secs_frame -- ticks per frame
local total_frames = (((hours * 3600 + minutes * 60) - 1) / secs_frame) + 1 -- total frames
return ticks_per_frame, total_frames
end
function print_status (frame, total_frames, ticks_per_frame, endless, free)
if endless then
local h, m, s = ticks_to_hms(frame * ticks_per_frame)
print("#" .. frame .. ", " .. h .. "h " .. m .. "m " .. s .. "s")
else
if frame < total_frames then
local h, m, s = ticks_to_hms(ticks_per_frame * (total_frames - frame))
print(frame .. "/" .. total_frames .. ", " .. h .. "h" .. m .. "m" .. s .. "s/" .. free .. " left")
else
print(frame .. "/" .. total_frames .. ", " .. free .. " left")
end
end
end
function ticks_to_hms (ticks)
local secs = (ticks + 500) / 1000 -- round to nearest seconds
local s = secs % 60
secs = secs / 60
local m = secs % 60
local h = secs / 60
return h, m, s
end
-- sleep, but using wait_click(); return true if a key was pressed, else false
function next_frame_sleep (frame, start_ticks, ticks_per_frame, total_frames)
-- this calculates the number of ticks between now and the time of
-- the next frame
if frame == total_frames then
return false
end
local next_frame = start_ticks + frame * ticks_per_frame
local sleep_time = next_frame - get_tick_count()
if sleep_time < 1 then
sleep_time = 1
end
wait_click(sleep_time)
return not is_key("no_key")
end
-- delay for the appropriate amount of time, but respond to
-- the display key (allows turning off display to save power)
-- return true if we should exit, else false
function frame_delay (frame, start_ticks, ticks_per_frame, total_frames)
-- this returns true while a key has been pressed, and false if
-- none
while next_frame_sleep (frame, start_ticks, ticks_per_frame, total_frames) do
-- honour the display button
if is_key("display") then
-- vvvvvvv CHANGED vvvvvvv
-- click("display")
set_lcd_display(1)
display_off_frame = frame + display_off_frame
-- ^^^^^^^ CHANGED ^^^^^^^
end
-- if set key is pressed, indicate that we should stop
if is_key("set") then
-- vvvvvvv ADDED vvvvvvv
set_lcd_display(1)
-- ^^^^^^^ ADDED ^^^^^^^
return true
end
end
return false
end
-- if the display mode is not the passed mode, click display and return true
-- otherwise return false
-- vvvvvvv REMOVED vvvvvvv
--function seek_display_mode(mode)
-- if get_prop(props.DISPLAY_MODE) == mode then
-- return false
-- else
-- click "display"
-- return true
-- end
--end
-- ^^^^^^^ REMOVED ^^^^^^^
-- wait for "name" button click until timeout.
-- returns true if button was clicked, false if timeout expired
function wait_button(timeout, name)
if timeout < 1 then
return false
end
local cur_timeout = timeout
local start_time = get_tick_count()
while cur_timeout > 0 do
wait_click(cur_timeout)
if is_key("no_key") then
-- timeout expired
return false
else
if is_key(name) then
-- user clicked requested key
return true
end
end
-- user clicked an unwanted key, we continue sleeping
local now = get_tick_count()
local elapsed = now - start_time
start_time = now
cur_timeout = cur_timeout - elapsed
end
return false
end
-- ^^^^^^^ CHANGED ^^^^^^^
ticks_per_frame, total_frames = calculate_parameters(secs_frame, hours, minutes)
frame = 1
-- vvvvvvv REMOVED vvvvvvv
-- original_display_mode = get_prop(props.DISPLAY_MODE)
-- target_display_mode = 2 -- off
-- ^^^^^^^ REMOVED ^^^^^^^
print "Press SET to exit"
start_ticks = get_tick_count()
while endless or frame <= total_frames do
local free = get_jpg_count() - 1 -- to account for the one we're going to make
-- in CHDK 1.2 we could check the return value of shoot()
-- but get_jpg_count() gives more compatibility
if free < 0 then
print "Memory full"
break
end
print_status(frame, total_frames, ticks_per_frame, endless, free)
-- vvvvvvv CHANGED vvvvvvv
if display_off_frame > 0 and frame > display_off_frame then
-- seek_display_mode(target_display_mode)
set_lcd_display(0)
-- ^^^^^^^ CHANGED ^^^^^^^
end
shoot()
if frame_delay(frame, start_ticks, ticks_per_frame, total_frames) then
print "User quit"
break
end
frame = frame + 1
end
-- restore display mode
-- vvvvvvv REMOVED vvvvvvv
--if display_off_frame > 0 then
-- while seek_display_mode(original_display_mode) do
-- sleep(1000)
-- end
--end
-- ^^^^^^^ REMOVED ^^^^^^^
restore()
