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--- misc_functions [2019/05/14 10:28] – akuzmuk
+++ misc_functions [2021/04/14 08:38] – atolstov
@@ Line 2: / Line 2: @@
 ==== GetTime ====
-The GetTime function returns table with local time information. **sec** field contains seconds in Unixtime format. **ns** field contains nanoseconds passed since current second.
+The GetTime function returns table with local time information. **sec** field contains seconds in Unixtime format. **ns** field contains nanoseconds passed since begin of current second.
 This function is available since WebHMI version 3.6
 Example:
-<code lua>
+<code lua GetTime>
 function main (userId)
     local time = GetTime();
@@ Line 14: / Line 14: @@
 end
 </code>
+==== Delay ====
+<code lua Delay>
+function main (userId)
+        --  Uncomment this part to measure the time spent
+                        -- local start_time = GetTime();
+        --
+    Delay(100.25, GetTimePrecise())
+        --  Uncomment this part to measure the time spent
+                        -- local cur_time = GetTime();     local cur_sec, cur_ns =  cur_time.sec, cur_time.ns
+                        -- local time_spent_sec, time_spent_ns = cur_sec - start_time.sec, cur_ns - start_time.ns
+                        -- local millseconds_spent = time_spent_sec * 1000 + time_spent_ns / 1000000
+                        -- ERROR("Time spent ms = " .. millseconds_spent)
+        --
+end
+ -- Additional functions can be defined after or before main() loop
+function GetTimePrecise()
+    local start_time = GetTime();
+    return   start_time.sec * 1000^3  + start_time.ns
+end
+function Delay (milliseconds, precise_start_time)
+    repeat
+        delay_ns = milliseconds * 1000000
+        local cur_time = GetTime();
+        time_over = GetTimePrecise() > (precise_start_time + delay_ns)
+    until time_over
+end
+</code>
+==== GetReg filter nil (if nil then zero) ====
+<code lua GetReg filtering>
+function main (userId)
+    val1 = GetReg(1) or 0 -- if GetReg is nil, then it will be equal to 0
+    TRACE("val1 " ..tostring(val1))
+	val2 = GetReg("temperature")
+	TRACE("val2 " ..tostring(val2))
+	val2_filtered = (val2 or 0) -- if val2 is nil, then it will be equal to 0 too.
+	TRACE("val2_filtered " ..tostring(val2_filtered))
+    sum = val1 + val2_filtered
+    TRACE(sum)
+end
+</code>