Fixed a number of bugs caused by using abs() on floats and long ints. Added support for selectively inverting bits of the stepping port. Debugged, optimized and cleaned up timing code for the step-pulses.

script/console

@@ -1,2 +1,2 @@
-socat -d -d READLINE /dev/tty.usbserial-A4001o6L,clocal=1,nonblock=1,cread=1,cs8,ixon=1,ixoff=1
+socat -d -d READLINE /dev/tty.usbserial-A9007QcR,clocal=1,nonblock=1,cread=1,cs8,ixon=1,ixoff=1
 

script/stream.rb

@@ -24,18 +24,21 @@ if ARGV.empty?
   exit
 end
 
-SerialPort.open('/dev/tty.usbserial-A4001o6L', 9600) do |sp|
+SerialPort.open('/dev/tty.usbserial-A9007QcR', 9600) do |sp|
+  sp.write("\r\n\r\n");
+  sleep 5
   ARGV.each do |file|
     puts "Processing file #{file}"
-    prebuffer = $prebuffer ? 10 : 0
+    prebuffer = $prebuffer ? 7 : 0
     File.readlines(file).each do |line|
       next if line.strip == ''
       puts line.strip
       sp.write("#{line.strip}\r\n");
       if prebuffer == 0
+        sleep 0.1
         begin
           result = sp.gets.strip
-          puts result unless result == '' or result == 'ok'
+          puts "Grbl >> #{result}" unless result == '' or result == 'ok'
         end while result != 'ok'
       else
         prebuffer -= 1