#!/usr/bin/env python
"""\
Simple g-code streaming script for grbl

Provided as an illustration of the basic communication interface
for grbl. When grbl has finished parsing the g-code block, it will
return an 'ok' or 'error' response. When the planner buffer is full,
grbl will not send a response until the planner buffer clears space.

G02/03 arcs are special exceptions, where they inject short line 
segments directly into the planner. So there may not be a response 
from grbl for the duration of the arc.
"""

import serial
import time

# Open grbl serial port
s = serial.Serial('/dev/tty.usbmodem1811',9600)

# Open g-code file
f = open('grbl.gcode','r');

# Wake up grbl
s.write("\r\n\r\n")
time.sleep(2)   # Wait for grbl to initialize 
s.flushInput()  # Flush startup text in serial input

# Stream g-code to grbl
for line in f:
    l = line.strip() # Strip all EOL characters for consistency
    print 'Sending: ' + l,
    s.write(l + '\n') # Send g-code block to grbl
    grbl_out = s.readline() # Wait for grbl response with carriage return
    print ' : ' + grbl_out.strip()

# Wait here until grbl is finished to close serial port and file.
raw_input("  Press <Enter> to exit and disable grbl.") 

# Close file and serial port
f.close()
s.close()