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epaper.py
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# Waveshare E-Paper 7.5B interface
from machine import Pin, SPI
import framebuf
import utime
from writer import Writer
import freesans20
import courier20
import gc
class ScreenImage(framebuf.FrameBuffer):
def __init__(self, buffer, width, height):
self.width = width
self.height = height
self.buffer = buffer
self.mode = framebuf.MONO_HLSB
super().__init__(self.buffer, self.width, self.height, self.mode)
class Screen:
# Display resolution
EPD_WIDTH = 800
EPD_HEIGHT = 480
RST_PIN = 12
DC_PIN = 8
CS_PIN = 9
BUSY_PIN = 13
EPD_TEXT_WIDTH = 80
EPD_TEXT_HEIGHT = 48
def __init__(self, external_black_buffer, external_red_buffer):
self.reset_pin = Pin(Screen.RST_PIN, Pin.OUT)
self.busy_pin = Pin(Screen.BUSY_PIN, Pin.IN, Pin.PULL_UP)
self.cs_pin = Pin(Screen.CS_PIN, Pin.OUT)
self.width = Screen.EPD_WIDTH
self.height = Screen.EPD_HEIGHT
self.x_middle = int(self.width / 2)
self.text_row = 1
self.buffer_black = external_black_buffer or bytearray(self.height * self.width // 8)
self.buffer_red = external_red_buffer or bytearray(self.height * self.width // 8)
self.imageblack = ScreenImage(self.buffer_black, self.width, self.height)
self.imagered = ScreenImage(self.buffer_red, self.width, self.height)
self.imageblack.fill(0xff)
self.imagered.fill(0x00)
self.writer_sans_black = Writer(self.imageblack, freesans20)
self.writer_sans_red = Writer(self.imagered, freesans20)
self.writer_courier_black = Writer(self.imageblack, courier20)
self.writer_courier_red = Writer(self.imagered, courier20)
self.spi = SPI(1)
self.spi.init(baudrate=4000_000)
self.dc_pin = Pin(Screen.DC_PIN, Pin.OUT)
self.init()
def text(self, text_str, row=0, col=1, red=False):
display_row = row if row > 0 else self.text_row
if display_row > Screen.EPD_TEXT_HEIGHT: return
if col + len(text_str) > Screen.EPD_TEXT_WIDTH: return
image = self.imageblack if not red else self.imagered
image.text(text_str, 1 + (col - 1) * 10, 1 + (display_row - 1) * 10, 0x00 if not red else 0xff)
if row == 0: self.text_row += 1
def text_sans(self, text_str, row, col, red=False):
image = self.imageblack if not red else self.imagered
writer = self.writer_sans_black if not red else self.writer_sans_red
Writer.set_textpos(image, row, col)
writer.printstring(text_str, invert=not red)
def text_courier(self, text_str, row, col, red=False, inverse=False):
image = self.imageblack if not red else self.imagered
writer = self.writer_courier_black if not red else self.writer_courier_red
Writer.set_textpos(image, row, col)
writer.printstring(text_str, invert=not red if not inverse else red)
def digital_write(self, pin, value):
pin.value(value)
def digital_read(self, pin):
return pin.value()
def delay_ms(self, delaytime):
utime.sleep(delaytime / 1000.0)
def spi_writebyte(self, data):
self.spi.write(bytearray(data))
def module_exit(self):
self.digital_write(self.reset_pin, 0)
# Hardware reset
def reset(self):
self.digital_write(self.reset_pin, 1)
self.delay_ms(200)
self.digital_write(self.reset_pin, 0)
self.delay_ms(2)
self.digital_write(self.reset_pin, 1)
self.delay_ms(200)
def send_command(self, command):
self.digital_write(self.dc_pin, 0)
self.digital_write(self.cs_pin, 0)
self.spi_writebyte([command])
self.digital_write(self.cs_pin, 1)
def send_data(self, data):
self.digital_write(self.dc_pin, 1)
self.digital_write(self.cs_pin, 0)
self.spi_writebyte([data])
self.digital_write(self.cs_pin, 1)
def WaitUntilIdle(self):
print("waiting until screen idle... ", end='')
while(self.digital_read(self.busy_pin) == 0): # Wait until the busy_pin goes LOW
self.delay_ms(20)
print('.', end='')
self.delay_ms(20)
print("done")
def TurnOnDisplay(self):
self.send_command(0x12) # DISPLAY REFRESH
self.delay_ms(100) #!!!The delay here is necessary, 200uS at least!!!
self.WaitUntilIdle()
def init(self):
# 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
# self.send_data(0x3f) # VDH=15V
# self.send_data(0x3f) # VDL=-15V
self.send_command(0x04) # POWER ON
self.delay_ms(100)
self.WaitUntilIdle()
self.send_command(0X00) # PANNEL SETTING
self.send_data(0x0F) # KW-3f KWR-2F BWROTP 0f BWOTP 1f
self.send_command(0x61) # tres
self.send_data(0x03) # source 800
self.send_data(0x20)
self.send_data(0x01) # gate 480
self.send_data(0xE0)
self.send_command(0X15)
self.send_data(0x00)
self.send_command(0X50) # VCOM AND DATA INTERVAL SETTING
self.send_data(0x11)
self.send_data(0x07)
self.send_command(0X60) # TCON SETTING
self.send_data(0x22)
self.send_command(0x65) # Resolution setting
self.send_data(0x00)
self.send_data(0x00) # 800*480
self.send_data(0x00)
self.send_data(0x00)
return 0;
def Clear(self):
high = self.height
if( self.width % 8 == 0) :
wide = self.width // 8
else :
wide = self.width // 8 + 1
self.send_command(0x10)
for j in range(0, high):
for i in range(0, wide):
self.send_data(0xff)
self.send_command(0x13)
for j in range(0, high):
for i in range(0, wide):
self.send_data(0x00)
self.TurnOnDisplay()
def ClearRed(self):
high = self.height
if( self.width % 8 == 0) :
wide = self.width // 8
else :
wide = self.width // 8 + 1
self.send_command(0x10)
for j in range(0, high):
for i in range(0, wide):
self.send_data(0xff)
self.send_command(0x13)
for j in range(0, high):
for i in range(0, wide):
self.send_data(0xff)
self.TurnOnDisplay()
def ClearBlack(self):
high = self.height
if( self.width % 8 == 0) :
wide = self.width // 8
else :
wide = self.width // 8 + 1
self.send_command(0x10)
for j in range(0, high):
for i in range(0, wide):
self.send_data(0x00)
self.send_command(0x13)
for j in range(0, high):
for i in range(0, wide):
self.send_data(0x00)
self.TurnOnDisplay()
def display(self):
high = self.height
if( self.width % 8 == 0) :
wide = self.width // 8
else :
wide = self.width // 8 + 1
# send black data
self.send_command(0x10)
for j in range(0, high):
for i in range(0, wide):
self.send_data(self.buffer_black[i + j * wide])
# send red data
self.send_command(0x13)
for j in range(0, high):
for i in range(0, wide):
self.send_data(self.buffer_red[i + j * wide])
self.TurnOnDisplay()
def sleep(self):
self.send_command(0x02) # power off
self.WaitUntilIdle()
self.send_command(0x07) # deep sleep
self.send_data(0xa5)