diff --git a/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epdconfig.py b/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epdconfig.py
index 46c047d..9b642e5 100644
--- a/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epdconfig.py
+++ b/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epdconfig.py
@@ -31,6 +31,8 @@ import os
 import logging
 import sys
 import time
+import spidev
+from RPi import GPIO
 
 # Pin definition
 RST_PIN         = 17
@@ -38,50 +40,45 @@ DC_PIN          = 25
 CS_PIN          = 8
 BUSY_PIN        = 24
 
-def __init__(self):
-    import spidev
-    import RPi.GPIO
+SPI = spidev.SpiDev()
 
-    self.GPIO = RPi.GPIO
-    self.SPI = spidev.SpiDev()
+def digital_write(pin, value):
+    GPIO.output(pin, value)
 
-def digital_write(self, pin, value):
-    self.GPIO.output(pin, value)
+def digital_read(pin):
+    return GPIO.input(pin)
 
-def digital_read(self, pin):
-    return self.GPIO.input(pin)
-
-def delay_ms(self, delaytime):
+def delay_ms(delaytime):
     time.sleep(delaytime / 1000.0)
 
-def spi_writebyte(self, data):
-    self.SPI.writebytes(data)
+def spi_writebyte(data):
+    SPI.writebytes(data)
 
-def spi_writebyte2(self, data):
-    self.SPI.writebytes2(data)
+def spi_writebyte2(data):
+    SPI.writebytes2(data)
 
-def module_init(self):
-    self.GPIO.setmode(self.GPIO.BCM)
-    self.GPIO.setwarnings(False)
-    self.GPIO.setup(self.RST_PIN, self.GPIO.OUT)
-    self.GPIO.setup(self.DC_PIN, self.GPIO.OUT)
-    self.GPIO.setup(self.CS_PIN, self.GPIO.OUT)
-    self.GPIO.setup(self.BUSY_PIN, self.GPIO.IN)
+def module_init():
+    GPIO.setmode(GPIO.BCM)
+    GPIO.setwarnings(False)
+    GPIO.setup(RST_PIN, GPIO.OUT)
+    GPIO.setup(DC_PIN, GPIO.OUT)
+    GPIO.setup(CS_PIN, GPIO.OUT)
+    GPIO.setup(BUSY_PIN, GPIO.IN)
 
     # SPI device, bus = 0, device = 0
-    self.SPI.open(0, 0)
-    self.SPI.max_speed_hz = 4000000
-    self.SPI.mode = 0b00
+    SPI.open(0, 0)
+    SPI.max_speed_hz = 4000000
+    SPI.mode = 0b00
     return 0
 
-def module_exit(self):
+def module_exit():
     logging.debug("spi end")
-    self.SPI.close()
+    SPI.close()
 
     logging.debug("close 5V, Module enters 0 power consumption ...")
-    self.GPIO.output(self.RST_PIN, 0)
-    self.GPIO.output(self.DC_PIN, 0)
+    GPIO.output(RST_PIN, 0)
+    GPIO.output(DC_PIN, 0)
 
-    self.GPIO.cleanup()
+    GPIO.cleanup()
 
 ### END OF FILE ###