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# Quick and simple Python 2 script to write the raw bytes,
# to a stomp device on the Quad Cortex.
from datetime import datetime
class StompCommand:
def __init__(self, action, value):
self.action = action
self.value = value
self.raw_bytes = bytearray(32)
self.encode_bytes()
def encode_bytes(self):
self.encode_time()
self.encode_action()
self.encode_value()
self.build_last_16_bytes()
def encode_time(self):
epoch = datetime.now().strftime("%s")
epoch_hex = hex(int(epoch))[2:]
epoch_bytes = bytearray.fromhex(epoch_hex)
epoch_bytes.reverse()
for i in range(4):
self.raw_bytes[i] = epoch_bytes[i]
def encode_action(self):
self.raw_bytes[9] = 0x00
if(self.action == "button"):
self.raw_bytes[8] = 0x01
self.raw_bytes[10] = 0x11
self.raw_bytes[11] = 0x01
elif(self.action == "rotary"):
self.raw_bytes[8] = 0x01
self.raw_bytes[10] = 0x08
self.raw_bytes[11] = 0x00
def encode_value(self):
if(self.value == "pressed"):
self.raw_bytes[12] = 0x01
elif(self.value == "released"):
self.raw_bytes[12] = 0x00
elif(self.value == "clock wise"):
self.raw_bytes[12] = 0x01
elif(self.value == "counter clock"):
self.raw_bytes[12] = 0xff
def build_last_16_bytes(self):
# build the last 16 bytes
for i in range(6):
self.raw_bytes[16+i] = self.raw_bytes[i]
def bytes_to_hex(self):
bytes_str = ""
for i in range(len(self.raw_bytes)):
bytes_str = bytes_str + str(self.raw_bytes[i]) + ' '
return bytes_str
def __str__(self):
return "Action: " + self.action + "\nValue: " + self.value + "\nBytes: " + self.bytes_to_hex()
with open('/dev/zencoder/knob_stomp2', 'wb') as file:
# write a button press
command = StompCommand("button", "pressed")
print command
file.write(command.raw_bytes)
print ''
# write a button release
command = StompCommand("button", "released")
print command
file.write(command.raw_bytes)
# close the file
file.close()
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