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# Quick and simple Python 2 script to read the raw bytes,
# from a stomp device on the Quad Cortex.
from datetime import datetime
class StompEvent:
def __init__(self, raw_bytes):
self.raw_bytes = raw_bytes
self.action = "unknown"
self.value = "unknown"
self.system_epoch = datetime.now().strftime("%s")
self.system_datetime = datetime.now()
self.decode_bytes()
def print_bytes(self):
bytes_str = ""
for i in range(len(self.raw_bytes)):
bytes_str = bytes_str + self.raw_bytes[i].encode('hex') + ' '
print bytes_str
print '---'*32
def decode_bytes(self):
self.decode_action()
self.decode_value()
self.decode_time()
def decode_action(self):
action_byte_1 = self.raw_bytes[10].encode('hex')
action_byte_2 = self.raw_bytes[11].encode('hex')
if(action_byte_1 == "11" and action_byte_2 == "01"):
self.action = "button"
elif(action_byte_1 == "08" and action_byte_2 == "00"):
self.action = "rotary"
def decode_value(self):
value_byte = self.raw_bytes[12].encode('hex')
if(value_byte == "00"):
self.value = "released"
elif(value_byte == "01"):
if(self.action == "button"):
self.value = "pressed"
elif(self.action == "rotary"):
self.value = "clock wise"
elif(value_byte == "ff"):
self.value = "counter clock"
def decode_time(self):
# the first 4 bytes form the time
time_bytes = self.raw_bytes[0:4]
time_bytes.reverse()
time_hex = ""
for i in range(len(time_bytes)):
time_hex = time_hex + time_bytes[i].encode('hex')
self.epoch = int(time_hex, 16)
self.date_time = datetime.fromtimestamp(self.epoch)
def __str__(self):
return "Action: " + self.action + "\nValue: " + self.value + "\nEpoch: " + str(self.epoch) + "\nDatetime: " + str(self.date_time)
with open('/dev/zencoder/knob_stomp2', 'rb') as file:
byte_buffer = []
while True:
byte = file.read(1)
if not byte:
break
byte_buffer.append(byte)
if len(byte_buffer) is 32:
event = StompEvent(byte_buffer)
print event
event.print_bytes()
byte_buffer = []
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