def receieve_packet(self):
"""
Receieve packe from CFA635 serial interface.
Parse it into the appropriate structure
"""
output = Packet()
while output.retry_count < 15 and output.cmd == None:
output.cmd = self.serial.read(1)
time.sleep(0.02)
output.increment_retry()
if output.cmd == None or output.cmd == "":
output.set_error("Unable to receive message type part")
return output
output.len = ord(self.serial.read(1))
if output.len == None or output.len == "":
output.set_error("Unable to receive message length part")
return output
output.data = self.serial.read(output.len)
if output.len != len(output.data):
output.set_error("Length doens't match data")
return output
output.crc = self.serial.read(2)
if output.crc == None or len(output.crc) < 2:
output.set_error("Didn't get entire CRC")
return output
def receieve_packet (self):
"""
Receieve packe from CFA635 serial interface.
Parse it into the appropriate structure
"""
output = Packet()
while output.retry_count < 15 and output.cmd == None:
output.cmd = self.serial.read(1)
time.sleep(0.02)
output.increment_retry()
if output.cmd == None or output.cmd == "" :
output.set_error("Unable to receive message type part")
return output
output.len = ord(self.serial.read(1))
if output.len == None or output.len == "" :
output.set_error("Unable to receive message length part")
return output
output.data = self.serial.read( output.len )
if output.len != len(output.data):
output.set_error("Length doens't match data")
return output
output.crc = self.serial.read(2)
if output.crc == None or len(output.crc) < 2 :
output.set_error("Didn't get entire CRC")
return output
def clear_screen(self):
""" #6 (0x06): Clear LCD Screen
"""
packet = Packet()
packet.cmd = "\x06"
packet.len = 0
self.dev.send_packet(packet)
def ping(self, payload):
""" #0 (0x00): Ping Command
"""
packet = Packet()
packet.cmd = "\x00"
if payload == None:
packet.len = 0
else:
packet.len = len(payload)
packet.data = payload
reply = self.dev.send_packet(packet)
if reply.len != packet.len:
raise Exception("Packet lengths don't match")
if reply.len > 0:
if reply.data != packet.data:
raise Exception("Packet payload dosn't match")
def reboot(self):
""" #5 (0x05): Reboot XES635BK-xxx-KU
"""
packet = Packet()
packet.cmd = "\x05"
packet.len = 3
packet.data = (chr(8) + chr(18) + chr(99))
self.dev.send_packet(packet)
def get_firmware_version(self):
""" #1 (0x01): Get Hardware & Firmware Version
"""
packet = Packet()
packet.cmd = "\x01"
packet.len = 0
reply = self.dev.send_packet(packet)
return reply.data
def set_cursor_position(self, col, row):
""" #11 (0x0B): Set LCD Cursor Position
"""
packet = Packet()
packet.cmd = "\x0B"
packet.len = 2
packet.data = (chr(col) + chr(row))
self.dev.send_packet(packet)
def read_keypad(self):
""" #24 (0x18): Read Keypad, Polled Mode
"""
packet = Packet()
packet.cmd = "\x18"
packet.len = 0
reply = self.dev.send_packet(packet)
return (reply.data[0], reply.data[1], reply.data[2])
def set_key_reporting (self, press, release):
""" #23 (0x17): Configure Key Reporting
"""
packet = Packet()
packet.cmd = "\x17"
packet.len = 2
packet.data = chr(press) + chr(release)
self.dev.send_packet(packet)
def set_contrast(self, contrast):
""" #13 (0x0D): Set LCD Contrast
"""
packet = Packet()
packet.cmd = "\x0D"
packet.len = 1
packet.data = chr(contrast)
self.dev.send_packet(packet)
def set_cursor_style(self, style):
""" #12 (0x0C): Set LCD Cursor Style
"""
packet = Packet()
packet.cmd = "\x0C"
packet.len = 1
packet.data = chr(style)
self.dev.send_packet(packet)
def get_cg_data(self, index):
""" #10 (0x0A): Read 8 Bytes of LCD Memory
"""
packet = Packet()
packet.cmd = "\x0A"
packet.len = 1
packet.data = chr(index)
reply = self.dev.send_packet(packet)
return (reply.data[0], reply.data[1:9])
def set_gpio(self, pin, value):
"""
#34 (0x22): Set GPO Pin
"""
packet = Packet()
packet.cmd = "\x22"
packet.len = 2
packet.data = chr(pin) + chr(value)
self.dev.send_packet(packet)
def set_backlight(self, backlight):
""" #14 (0x0E): Set LCD & Keypad Backlight
"""
packet = Packet()
packet.cmd = "\x0E"
packet.len = 1
packet.data = chr(backlight)
self.backlight_current = backlight
self.dev.send_packet(packet)
def write_user_flash(self, data):
""" #2 (0x02): Write User Flash Area
"""
packet = Packet()
packet.cmd = "\x02"
packet.data = data
packet.len = len(data)
if packet.len != 16:
raise Exception("Flash Write must be exacty 16 bytes")
self.dev.send_packet(packet)
def set_cg_data(self, index, data):
""" #9 (0x09): Set LCD Special Character Data
"""
if len(data) != 8:
raise Exception("Data should be 8 bytes")
packet = Packet()
packet.cmd = "\x09"
packet.len = 9
packet.data = (chr(index) + data)
self.dev.send_packet(packet)
def set_text( self, row, col, text):
"""
#31 (0x1F): Send Data to LCD
"""
if len(text) > ( 21 - col):
raise Exception("Text runs over end.")
packet = Packet()
packet.cmd = "\x1F"
packet.data = chr(col) + chr(row)
packet.data += text
packet.len = len(packet.data)
self.dev.send_packet(packet)