From a615d23b65291307929b2a2542b594a7dc5b8f2d Mon Sep 17 00:00:00 2001
From: "Eugeniy E. Mikhailov" <evgmik@gmail.com>
Date: Wed, 2 Jun 2021 14:04:11 -0400
Subject: added init with possibility of aborting

---
 init.lua     | 57 ++++++++++++++++++++++++++++++---------------------------
 init.old.lua | 30 ++++++++++++++++++++++++++++++
 main.lua     |  5 +++++
 3 files changed, 65 insertions(+), 27 deletions(-)
 create mode 100644 init.old.lua

diff --git a/init.lua b/init.lua
index 34c744e..25a33aa 100644
--- a/init.lua
+++ b/init.lua
@@ -1,30 +1,33 @@
--- Compile server code and remove original .lua files.
--- This only happens the first time after the .lua files are uploaded.
-local compileAndRemoveIfNeeded = function(f)
-   if file.open(f) then
-      file.close()
-      print('Compiling:', f)
-      node.compile(f)
-      file.remove(f)
-      collectgarbage()
-   end
-end
+-- allows to interrupt start up in the first 5 seconds by hitting <ENTER>
+-- borrowed from https://bigdanzblog.wordpress.com/2015/04/24/esp8266-nodemcu-interrupting-init-lua-during-boot/
+function abortInit()
+    -- initailize abort boolean flag
+    abort = false
+    print('Press ENTER within 5 seconds to abort startup')
+    -- if <CR> is pressed, call abortTest
+    uart.on('data', '\r', abortTest, 0)
+    -- start timer to execute startup function in 5 seconds
+    tmr.create():alarm(5000,tmr.ALARM_SINGLE,startup)
+    end
+    
+function abortTest(data)
+    -- user requested abort
+    abort = true
+    -- turns off uart scanning
+    uart.on('data')
+    end
 
-local serverFiles = {
-   'microwire.lua',
-   'lmx2487lib.lua',
-   'binaryLib.lua',
-   'freq2lmx2487settings.lua'
-}
---for i, f in ipairs(serverFiles) do compileAndRemoveIfNeeded(f) end
+function startup()
+    uart.on('data')
+    -- if user requested abort, exit
+    if abort == true then
+        print('startup aborted')
+        return
+        end
+    -- otherwise, start up
+    print('in startup')
+    dofile('main.lua')
+    end
 
-compileAndRemoveIfNeeded = nil
-serverFiles = nil
-collectgarbage()
+tmr.create():alarm(1000,tmr.ALARM_SINGLE,abortInit)           -- call abortInit after 1s
 
-
--- some diagnostic
-print('chip: ',node.chipid())
-print('heap: ',node.heap())
-
-dofile("main.lua")
diff --git a/init.old.lua b/init.old.lua
new file mode 100644
index 0000000..34c744e
--- /dev/null
+++ b/init.old.lua
@@ -0,0 +1,30 @@
+-- Compile server code and remove original .lua files.
+-- This only happens the first time after the .lua files are uploaded.
+local compileAndRemoveIfNeeded = function(f)
+   if file.open(f) then
+      file.close()
+      print('Compiling:', f)
+      node.compile(f)
+      file.remove(f)
+      collectgarbage()
+   end
+end
+
+local serverFiles = {
+   'microwire.lua',
+   'lmx2487lib.lua',
+   'binaryLib.lua',
+   'freq2lmx2487settings.lua'
+}
+--for i, f in ipairs(serverFiles) do compileAndRemoveIfNeeded(f) end
+
+compileAndRemoveIfNeeded = nil
+serverFiles = nil
+collectgarbage()
+
+
+-- some diagnostic
+print('chip: ',node.chipid())
+print('heap: ',node.heap())
+
+dofile("main.lua")
diff --git a/main.lua b/main.lua
index 0d22c58..3ba8113 100644
--- a/main.lua
+++ b/main.lua
@@ -3,6 +3,11 @@ Eugeniy Mikhailov
 1 June 2021
  ]]
  
+startup=nil
+abortTest=nil
+abortInit=nil
+
+
 dofile("binaryLib.lua")
 dofile("microwire.lua")
 dofile("lmx2487lib.lua")
-- 
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