FWIW, I use the following focus module in chdkptp and some of my scripts
-- focus override module
focus={
mode_names={'AF','AFL','MF'},
valid_modes={}, -- table of name=true
modes={}, -- array of usable mode names
}
-- initialize valid modes for sd over
function focus:init()
-- bits: 1 = AF, 2 = AFL, 3 = MF
local modes=get_sd_over_modes()
self.modes={}
for i=1,3 do
if bitand(1,modes) == 1 then
table.insert(self.modes,self.mode_names[i])
end
modes = bitshru(modes,1)
end
for i,m in ipairs(self.modes) do
self.valid_modes[m]=true
end
end
-- get current AF/AFL/MF state
function focus:get_mode()
if get_prop(require'propcase'.AF_LOCK) == 1 then
return 'AFL'
end
if get_prop(require'propcase'.FOCUS_MODE) == 1 then
return 'MF'
end
return 'AF'
end
--[[
set AF/AFL/MF state
mode is one of 'AF','MF', 'AFL'
unless force is true, does not call set functions if already in desired state
]]
function focus:set_mode(mode,force)
local cur_mode = self:get_mode()
if not force and cur_mode == mode then
return
end
if mode == 'AF' then
if cur_mode == 'MF' then
set_mf(false)
elseif cur_mode == 'AFL' then
set_aflock(false)
end
elseif mode == 'AFL' then
if cur_mode == 'MF' then
set_mf(false)
end
set_aflock(true)
elseif mode == 'MF' then
if cur_mode == 'AFL' then
set_aflock(false)
end
set_mf(true)
end
end
--[[
set to a mode that allows override, defaulting to prefmode, or the current mode if not set
]]
function focus:enable_override(prefmode)
-- override not supported or in playback
if #self.modes == 0 or not get_mode() then
return false
end
-- no pref, default to overriding in current mode if possible
if not prefmode then
prefmode=self:get_mode()
end
local usemode
if self.valid_modes[prefmode] then
usemode = prefmode
else
-- if pref is MF or AFL, prefer locked if available
if prefmode == 'MF' and self.valid_modes['AFL'] then
usemode = 'AFL'
elseif prefmode == 'AFL' and self.valid_modes['MF'] then
usemode = 'MF'
elseif self.valid_modes[self:get_mode()] then
usemode = self:get_mode()
else
-- no pref, use first available
usemode = self.modes[1]
end
end
self:set_mode(usemode)
return true
end
function focus:set(dist)
set_focus(dist)
end
This detects which override modes the port supports, and also has code to check which mode is currently set.
