default lib is bcm2835, A few minor fixes

RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd7in5_V2.py

@@ -79,6 +79,7 @@ class EPD:
             self.send_command(0x71)
             busy = epdconfig.digital_read(self.busy_pin)
         epdconfig.delay_ms(200)
+        logging.debug("e-Paper busy release")
         
     def init(self):
         if (epdconfig.module_init() != 0):
@@ -86,6 +87,12 @@ class EPD:
         # EPD hardware init start
         self.reset()
         
+        self.send_command(0x06)     # btst
+        self.send_data(0x17)
+        self.send_data(0x17)
+        self.send_data(0x28)        # If an exception is displayed, try using 0x38
+        self.send_data(0x17)
+        
         self.send_command(0x01)			#POWER SETTING
         self.send_data(0x07)
         self.send_data(0x07)    #VGH=20V,VGL=-20V

RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd7in5b_V2.py

@@ -73,13 +73,20 @@ class EPD:
             self.send_command(0x71)
             busy = epdconfig.digital_read(self.busy_pin)
         epdconfig.delay_ms(200)
-            
+        logging.debug("e-Paper busy release")
+        
     def init(self):
         if (epdconfig.module_init() != 0):
             return -1
             
         self.reset()
         
+        # self.send_command(0x06)     # btst
+        # self.send_data(0x17)
+        # self.send_data(0x17)
+        # self.send_data(0x38)        # If an exception is displayed, try using 0x38
+        # self.send_data(0x17)
+
         self.send_command(0x01);			#POWER SETTING
         self.send_data(0x07);
         self.send_data(0x07);    #VGH=20V,VGL=-20V