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#!/usr/bin/python
import time
import serial
import signal
import sys, csv
import pygame
class Serial(serial.PosixSerial,serial.FileLike):
#workaround for python 2.6 seriall behavior, http://code.google.com/p/python-on-a-chip/issues/detail?id=110
pass
ser = Serial(
port='/dev/ttyUSB0',
baudrate=115200,
)
def signal_handler(signal, frame):
print "closing serial port"
ser.close()
sys.exit(0)
signal.signal(signal.SIGINT, signal_handler)
tStart=time.time()
waiting=True
print "Starting..."
while waiting:
ser.write('a') #start comms
time.sleep(0.1);
while time.time()-tStart<1.0 and waiting :
if ser.inWaiting() >0:
print ser.readline()
waiting=False
time.sleep(0.1);
if waiting:
print "Timeout,restarting..."
tStart=time.time()
window = pygame.display.set_mode((640, 512))
y=127
times=[]
tSec=40;
while 1:
if ser.inWaiting() >0:
i=ser.readline(eol=chr(0))
#print "received packet:",len(i),"bytes"
pygame.draw.rect(window,(0,0,0),(0,0, 640,512))
for x in range(0,len(i)-1): #skip end char
y1=ord(i[x])
pygame.draw.line(window, (255, 255, 255), (x*2, y*2), ((x*2)+2, y1*2))
y=y1
tNow=time.time();
times.append(tNow-tStart);
tStart=tNow
if len(times)>320:
times.pop(0)
for x in range(0,len(times)-1): #skip end char
pygame.draw.line(window, (255, 0, 0), (x*2, 512-(255*times[x]*tSec)), ((x*2)+2, 512-(255*times[x]*tSec)) )
pygame.display.flip()
time.sleep(0.01)
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