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Author: sshahryiar

AEDR8300 Optical Encoder with External Interrupt/SSD1306_I2C.py

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+from micropython import const
+from utime import sleep_ms
+import framebuf  
+
+
+disp_width                                   = const(128)
+disp_height                                  = const(64)
+disp_pages                                   = const((disp_height >> 3))
+
+# Constants
+SSD1306_I2C_address                          = const(0x3C)
+
+SSD1306_SET_CONTRAST                         = const(0x81)
+SSD1306_DISPLAY_ALL_ON_RESUME                = const(0xA4)
+SSD1306_DISPLAY_ALL_ON                       = const(0xA5)
+SSD1306_NORMAL_DISPLAY                       = const(0xA6)
+SSD1306_INVERT_DISPLAY                       = const(0xA7)
+SSD1306_DISPLAY_OFF                          = const(0xAE)
+SSD1306_DISPLAY_ON                           = const(0xAF)
+SSD1306_SET_DISPLAY_OFFSET                   = const(0xD3)
+SSD1306_SET_COM_PINS                         = const(0xDA)
+SSD1306_SET_VCOM_DETECT                      = const(0xDB)
+SSD1306_SET_DISPLAY_CLOCK_DIV                = const(0xD5)
+SSD1306_SET_PRECHARGE                        = const(0xD9)
+SSD1306_SET_MULTIPLEX                        = const(0xA8)
+SSD1306_SET_LOW_COLUMN                       = const(0x00)
+SSD1306_SET_HIGH_COLUMN                      = const(0x10)
+SSD1306_SET_START_LINE                       = const(0x40)
+SSD1306_MEMORY_MODE                          = const(0x20)
+SSD1306_COLUMN_ADDR                          = const(0x21)
+SSD1306_PAGE_ADDR                            = const(0x22)
+SSD1306_COM_SCAN_INC                         = const(0xC0)
+SSD1306_COM_SCAN_DEC                         = const(0xC8)
+SSD1306_SEG_REMAP                            = const(0xA0)
+SSD1306_CHARGE_PUMP                          = const(0x8D)
+SSD1306_EXTERNAL_VCC                         = const(0x01)
+SSD1306_SWITCH_CAP_VCC                       = const(0x02)
+
+# Scrolling constants
+SSD1306_ACTIVATE_SCROLL                      = const(0x2F)
+SSD1306_DEACTIVATE_SCROLL                    = const(0x2E)
+SSD1306_SET_VERTICAL_SCROLL_AREA             = const(0xA3)
+SSD1306_RIGHT_HORIZONTAL_SCROLL              = const(0x26)
+SSD1306_LEFT_HORIZONTAL_SCROLL               = const(0x27)
+SSD1306_VERTICAL_AND_RIGHT_HORIZONTAL_SCROLL = const(0x29)
+SSD1306_VERTICAL_AND_LEFT_HORIZONTAL_SCROLL  = const(0x2A)
+
+
+class OLED1306(framebuf.FrameBuffer):
+
+    def __init__(self, _i2c, _i2c_addr = SSD1306_I2C_address):
+        self.width = disp_width
+        self.height = disp_height
+        self._pages = disp_pages
+        
+        self.WHITE = 1
+        self.BLACK = 0
+        
+        self.i2c = _i2c
+        self.i2c_addr = _i2c_addr
+
+        self.temp = bytearray(2)
+        self.write_list = [b"\x40", None]   
+        
+        self.buffer = bytearray(self._pages * self.width)
+        super().__init__(self.buffer, self.width, self.height, framebuf.MONO_VLSB)
+        self.init_display()
+
+
+    def write_command(self, cmd):
+        self.temp[0] = 0x80  
+        self.temp[1] = cmd
+        self.i2c.writeto(self.i2c_addr, self.temp)
+
+    
+    def write_data(self, value):
+        self.write_list[1] = value
+        self.i2c.writevto(self.i2c_addr, self.write_list)
+
+
+    def init_display(self):
+        self.write_command(SSD1306_DISPLAY_OFF)
+        self.write_command(SSD1306_SET_DISPLAY_CLOCK_DIV)
+        self.write_command(0x80)
+
+        self.write_command(SSD1306_SET_MULTIPLEX)
+        self.write_command((self.height - 1))
+
+        self.write_command(SSD1306_SET_DISPLAY_OFFSET)
+        self.write_command(0x00)
+
+        self.write_command((SSD1306_SET_START_LINE | 0x00))
+   
+        self.write_command(SSD1306_CHARGE_PUMP)
+        self.write_command(0x14)  # 0x10  # 0x14
+
+        self.write_command(SSD1306_MEMORY_MODE)
+        self.write_command(0x00)
+
+        self.write_command((SSD1306_SEG_REMAP | 0x01))
+        self.write_command(SSD1306_COM_SCAN_DEC)
+        self.write_command(SSD1306_SET_COM_PINS)
+        self.write_command(0x12)
+
+        self.write_command(SSD1306_SET_CONTRAST)
+        self.write_command(0xCF) # 0x9F # 0xCF
+
+        self.write_command(SSD1306_SET_PRECHARGE)
+        self.write_command(0xF1) # 0x22 # 0xF1
+
+        self.write_command(SSD1306_SET_VCOM_DETECT)
+        self.write_command(0x40)
+
+        self.write_command(SSD1306_DISPLAY_ALL_ON_RESUME)
+        self.write_command(SSD1306_NORMAL_DISPLAY)
+        self.write_command(SSD1306_DISPLAY_ON)
+
+
+    def show(self):
+        x0 = 0
+        x1 = (self.width - 1)
+        if (self.width == 64):
+            # displays with width of 64 pixels are shifted by 32
+            x0 += 32
+            x1 += 32
+            
+        self.write_command(SSD1306_COLUMN_ADDR)
+        self.write_command(x0)
+        self.write_command(x1)
+        self.write_command(SSD1306_PAGE_ADDR)
+        self.write_command(0x00)
+        self.write_command((self._pages - 1))
+        self.write_data(self.buffer)

AEDR8300 Optical Encoder with External Interrupt/main.py

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+from pyb import LED, Pin, ExtInt
+from machine import I2C
+from micropython import const
+from SSD1306_I2C import OLED1306
+from utime import sleep_ms
+
+
+MAX_count = const(1000)
+MIN_count = const(-1000)
+
+count = 0
+step_size = 1
+past_value = 1
+
+
+led = LED(1)
+
+
+TWI = I2C(scl = 'PB9', sda = 'PB8', freq = 400000)
+
+
+oled = OLED1306(TWI)
+oled.fill(oled.BLACK)
+oled.show()
+
+
+sw_pin = Pin('PA0', Pin.IN, Pin.PULL_UP)
+enc_a_pin = Pin('PA2', Pin.IN, Pin.PULL_NONE) 
+enc_b_pin = Pin('PA3', Pin.IN, Pin.PULL_NONE)
+
+
+def EXTI_ENC_A(pin): 
+    global count
+    
+    state_of_A = enc_a_pin.value()
+    state_of_B = enc_b_pin.value()
+    
+    if((state_of_A == True) and (state_of_B == False)):
+        count -= step_size
+
+    if(count > MAX_count):
+        count = MIN_count   
+    
+
+def EXTI_ENC_B(pin):
+    global count
+    
+    state_of_A = enc_a_pin.value()
+    state_of_B = enc_b_pin.value()
+           
+    if((state_of_A == False) and (state_of_B == True)):
+        count += step_size
+    
+    if(count < MIN_count):
+        count = MAX_count
+        
+        
+EXTI_A = ExtInt(enc_a_pin,
+                ExtInt.IRQ_RISING,
+                Pin.PULL_NONE,
+                EXTI_ENC_A)   
+
+EXTI_B = ExtInt(enc_b_pin,
+                ExtInt.IRQ_RISING,
+                Pin.PULL_NONE,
+                EXTI_ENC_B)
+
+
+while(True):
+    if(sw_pin.value() == False):
+        led.on()
+        sleep_ms(400)
+        led.off()
+        while(sw_pin.value() == False):
+            pass
+        step_size *= 10
+        
+        if(step_size > 1000):
+            step_size = 1
+    
+    if(past_value != count):
+        led.on()
+        oled.fill(oled.BLACK)
+        oled.text("AEDR8300 Encoder", 1, 2, oled.WHITE)
+        oled.text("Value: " + str("%03u" %count), 1, 20, oled.WHITE)
+        oled.show()
+        past_value = count
+        sleep_ms(100)
+        led.off()
+        sleep_ms(100)
+