Embedded Systems LogiMachine5 Power - Page 206

206
-- validate channel number and value
if chan >= 1 and chan <= 512 and val >= 0 and val <= 255 then
storage.exec('lset', key, chan - 1, val)
end
end
-- value getter
function get(chan, key)
local res, val
key = key or defaults.skey
chan = tonumber(chan) or 0
-- validate channel number and value
if chan >= 1 and chan <= 512 then
res = storage.exec('lrange', key, chan - 1, chan - 1)
if type(res) == 'table' then
val = tonumber(res[ 1 ])
end
end
return val
end
-- DMX init, returns new DMX object
function init(params)
local n, k, v, _
-- create metatable and set user parameters
n = setmetatable({}, { __index = DMX })
n.params = params or {}
_, n.conn = pcall(require('redis').connect)
-- merge parameters that are set by user
for k, v in pairs(defaults) do
if n.params[ k ] == nil then
n.params[ k ] = v
end
end
n:reset()
return n
end
function DMX:reset()
local err, chan, params
params = self.params
self.dm, err = luadmx.open(params.port)
-- error while opening
if err then
os.sleep(1)
error(err)
end
-- set channel count
self.dm:setcount(params.channels)
-- number of transaction ticks
self.ticks = math.max(1, params.transition * params.resolution)