Fix oled screen

esp32-lora/screen.py

@@ -2,24 +2,34 @@ from machine import Pin, SoftI2C
 from ssd1306 import SSD1306_I2C
 import time
 
-class Screen :
+class Screen:
 
     sda = None
     scl = None
     rst = None
     oled = None
 
-    def __init__(self) :
+    def __init__(self):
         self.sda = Pin(17)
         self.scl = Pin(18)
         self.rst = Pin(21, Pin.OUT)
-        self.oled =  SSD1306_I2C(
+
+        self.__reset_oled()  # reset first
+
+        self.oled = SSD1306_I2C(
             128,
             64,
             SoftI2C(scl=self.scl, sda=self.sda, freq=100000),
             addr=0x3C
         )
-        self.__prepare()
+
+        self.reset()  # clear screen
+
+    def __reset_oled(self):
+        self.rst.value(0)
+        time.sleep_ms(150)
+        self.rst.value(1)
+        time.sleep_ms(150)
 
     def reset(self):
         self.oled.fill(0)
@@ -28,9 +38,3 @@ class Screen :
     def display(self, message, col, row):
         self.oled.text(message, col, row)
         self.oled.show()
-
-    def __prepare(self):
-        self.rst.value(0)
-        time.sleep_ms(150)
-        self.rst.value(1)
-        time.sleep_ms(150)