ESP8266 的几个代码 加深对LUA的理解

--some functions
dofile("functions.lua")
lighton1=0
lighton2=0
lighton3=0
lighton4=0

pin1 = 0
pin2 = 1
pin3 = 4
pin4 = 5
gpio.mode(pin1,gpio.OUTPUT)
gpio.mode(pin2,gpio.OUTPUT)
gpio.mode(pin3,gpio.OUTPUT)
gpio.mode(pin4,gpio.OUTPUT)

--pin1
tmr.alarm(0,1000,1,function()
if lighton1==0 then 
    lighton1=1 
    gpio.write(pin1,gpio.LOW)
    -- 512/1024, 50% duty cycle
else 
    lighton1=0 
    gpio.write(pin1,gpio.HIGH)
end 
end)
--pin2
tmr.alarm(1,1000,1,function()
if lighton2==0 then 
    lighton2=1 
    gpio.write(pin2,gpio.LOW)
    -- 512/1024, 50% duty cycle
else 
    lighton2=0 
    gpio.write(pin2,gpio.HIGH)
end 
end)
--pin3
tmr.alarm(2,1000,1,function()
if lighton3==0 then 
    lighton3=1 
    gpio.write(pin3,gpio.LOW)
    -- 512/1024, 50% duty cycle
else 
    lighton3=0 
    gpio.write(pin3,gpio.HIGH)
end 
end)
--pin4
tmr.alarm(3,1000,1,function()
if lighton4==0 then 
    lighton4=1 
    gpio.write(pin4,gpio.LOW)
    -- 512/1024, 50% duty cycle
else 
    lighton4=0 
    gpio.write(pin4,gpio.HIGH)
end 
end)
dofile("sjson.lua")
--inti.lua

--sjson.lua
name = "lxx"
print("Hello world!")
print(name .. ",nihao!")

--functions.lua
function startup()
    if file.open("init.lua") == nil then
        print("init.lua deleted or renamed")
    else
        print("Running")
        file.close("init.lua")
        -- the actual application is stored in 'application.lua'
        -- dofile("application.lua")
    end
end

-- Define WiFi station event callbacks 
wifi_connect_event = function(T) 
  print("Connection to AP("..T.SSID..") established!")
  print("Waiting for IP address...")
  if disconnect_ct ~= nil then disconnect_ct = nil end  
end

wifi_got_ip_event = function(T) 
  -- Note: Having an IP address does not mean there is internet access!
  -- Internet connectivity can be determined with net.dns.resolve().    
  print("Wifi connection is ready! IP address is: "..T.IP)
  print("Startup will resume momentarily, you have 3 seconds to abort.")
  print("Waiting...") 
  tmr.create():alarm(3000, tmr.ALARM_SINGLE, startup)
end

wifi_disconnect_event = function(T)
  if T.reason == wifi.eventmon.reason.ASSOC_LEAVE then 
    --the station has disassociated from a previously connected AP
    return 
  end
  -- total_tries: how many times the station will attempt to connect to the AP. Should consider AP reboot duration.
  local total_tries = 75
  print("
WiFi connection to AP("..T.SSID..") has failed!")

  --There are many possible disconnect reasons, the following iterates through 
  --the list and returns the string corresponding to the disconnect reason.
  for key,val in pairs(wifi.eventmon.reason) do
    if val == T.reason then
      print("Disconnect reason: "..val.."("..key..")")
      break
    end
  end

  if disconnect_ct == nil then 
    disconnect_ct = 1 
  else
    disconnect_ct = disconnect_ct + 1 
  end
  if disconnect_ct < total_tries then 
    print("Retrying connection...(attempt "..(disconnect_ct+1).." of "..total_tries..")")
  else
    wifi.sta.disconnect()
    print("Aborting connection to AP!")
    disconnect_ct = nil  
  end
end