349 lines
11 KiB
Python
349 lines
11 KiB
Python
#!/usr/bin/python3
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# -*- coding: utf-8 -*-
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"""
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Drivers file for Inky-Calendar software.
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Handles E-Paper display related tasks
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"""
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from PIL import Image
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import RPi.GPIO as GPIO
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from settings import display_type
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import numpy
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import spidev
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import RPi.GPIO as GPIO
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from time import sleep
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RST_PIN = 17
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DC_PIN = 25
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CS_PIN = 8
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BUSY_PIN = 24
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EPD_WIDTH = 640
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EPD_HEIGHT = 384
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SPI = spidev.SpiDev(0, 0)
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def epd_digital_write(pin, value):
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GPIO.output(pin, value)
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def epd_digital_read(pin):
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return GPIO.input(BUSY_PIN)
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def epd_delay_ms(delaytime):
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sleep(delaytime / 1000.0)
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def spi_transfer(data):
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SPI.writebytes(data)
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def epd_init():
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GPIO.setmode(GPIO.BCM)
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GPIO.setwarnings(False)
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GPIO.setup(RST_PIN, GPIO.OUT)
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GPIO.setup(DC_PIN, GPIO.OUT)
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GPIO.setup(CS_PIN, GPIO.OUT)
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GPIO.setup(BUSY_PIN, GPIO.IN)
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SPI.max_speed_hz = 4000000
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SPI.mode = 0b00
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return 0;
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# EPD7IN5 commands
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PANEL_SETTING = 0x00
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POWER_SETTING = 0x01
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POWER_OFF = 0x02
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POWER_OFF_SEQUENCE_SETTING = 0x03
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POWER_ON = 0x04
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POWER_ON_MEASURE = 0x05
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BOOSTER_SOFT_START = 0x06
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DEEP_SLEEP = 0x07
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DATA_START_TRANSMISSION_1 = 0x10
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DATA_STOP = 0x11
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DISPLAY_REFRESH = 0x12
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IMAGE_PROCESS = 0x13
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LUT_FOR_VCOM = 0x20
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LUT_BLUE = 0x21
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LUT_WHITE = 0x22
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LUT_GRAY_1 = 0x23
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LUT_GRAY_2 = 0x24
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LUT_RED_0 = 0x25
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LUT_RED_1 = 0x26
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LUT_RED_2 = 0x27
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LUT_RED_3 = 0x28
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LUT_XON = 0x29
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PLL_CONTROL = 0x30
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TEMPERATURE_SENSOR_COMMAND = 0x40
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TEMPERATURE_CALIBRATION = 0x41
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TEMPERATURE_SENSOR_WRITE = 0x42
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TEMPERATURE_SENSOR_READ = 0x43
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VCOM_AND_DATA_INTERVAL_SETTING = 0x50
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LOW_POWER_DETECTION = 0x51
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TCON_SETTING = 0x60
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TCON_RESOLUTION = 0x61
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SPI_FLASH_CONTROL = 0x65
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REVISION = 0x70
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GET_STATUS = 0x71
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AUTO_MEASUREMENT_VCOM = 0x80
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READ_VCOM_VALUE = 0x81
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VCM_DC_SETTING = 0x82
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class EPD:
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def __init__(self):
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self.reset_pin = RST_PIN
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self.dc_pin = DC_PIN
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self.busy_pin = BUSY_PIN
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self.width = EPD_WIDTH
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self.height = EPD_HEIGHT
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def digital_write(self, pin, value):
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epd_digital_write(pin, value)
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def digital_read(self, pin):
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return epd_digital_read(pin)
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def delay_ms(self, delaytime):
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epd_delay_ms(delaytime)
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def send_command(self, command):
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self.digital_write(self.dc_pin, GPIO.LOW)
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spi_transfer([command])
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def send_data(self, data):
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self.digital_write(self.dc_pin, GPIO.HIGH)
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spi_transfer([data])
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def init(self):
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if (epd_init() != 0):
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return -1
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self.reset()
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self.send_command(POWER_SETTING)
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self.send_data(0x37)
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self.send_data(0x00)
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self.send_command(PANEL_SETTING)
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self.send_data(0xCF)
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self.send_data(0x08)
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self.send_command(BOOSTER_SOFT_START)
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self.send_data(0xc7)
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self.send_data(0xcc)
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self.send_data(0x28)
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self.send_command(POWER_ON)
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self.wait_until_idle()
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self.send_command(PLL_CONTROL)
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self.send_data(0x3c)
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self.send_command(TEMPERATURE_CALIBRATION)
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self.send_data(0x00)
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self.send_command(VCOM_AND_DATA_INTERVAL_SETTING)
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self.send_data(0x77)
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self.send_command(TCON_SETTING)
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self.send_data(0x22)
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self.send_command(TCON_RESOLUTION)
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self.send_data(0x02) #source 640
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self.send_data(0x80)
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self.send_data(0x01) #gate 384
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self.send_data(0x80)
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self.send_command(VCM_DC_SETTING)
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self.send_data(0x1E) #decide by LUT file
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self.send_command(0xe5) #FLASH MODE
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self.send_data(0x03)
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def wait_until_idle(self):
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while(self.digital_read(self.busy_pin) == 0): # 0: busy, 1: idle
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self.delay_ms(100)
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def reset(self):
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self.digital_write(self.reset_pin, GPIO.LOW) # module reset
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self.delay_ms(200)
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self.digital_write(self.reset_pin, GPIO.HIGH)
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self.delay_ms(200)
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def calibrate_display(self, no_of_cycles):
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"""Function for Calibration"""
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if display_type == 'colour':
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packets = int(self.width / 2 * self.height)
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if display_type == 'black_and_white':
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packets = int(self.width / 4 * self.height)
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white, red, black = 0x33, 0x04, 0x00
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self.init()
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print('----------Started calibration of E-Paper display----------')
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for _ in range(no_of_cycles):
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self.send_command(DATA_START_TRANSMISSION_1)
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print('Calibrating black...')
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[self.send_data(black) for i in range(packets)]
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self.send_command(DISPLAY_REFRESH)
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self.wait_until_idle()
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if display_type == 'colour':
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print('Calibrating red...')
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self.send_command(DATA_START_TRANSMISSION_1)
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[self.send_data(red) for i in range(packets)]
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self.send_command(DISPLAY_REFRESH)
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self.wait_until_idle()
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print('Calibrating white...')
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self.send_command(DATA_START_TRANSMISSION_1)
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[self.send_data(white) for i in range(packets)]
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self.send_command(DISPLAY_REFRESH)
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self.wait_until_idle()
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print('Cycle {0} of {1} complete'.format(_+1, no_of_cycles))
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print('-----------Calibration complete----------')
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self.sleep()
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def reduce_colours(self, image):
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buffer = numpy.array(image)
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r,g,b = buffer[:,:,0], buffer[:,:,1], buffer[:,:,2]
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if display_type == "colour":
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buffer[numpy.logical_and(r <= 180, r == g)] = [0,0,0] #black
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buffer[numpy.logical_and(r >= 150, g >= 150)] = [255,255,255] #white
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buffer[numpy.logical_and(r >= 150, g <= 90)] = [255,0,0] #red
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if display_type == "black_and_white":
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buffer[numpy.logical_and(r > 245, g > 245)] = [255,255,255] #white
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buffer[g < 255] = [0,0,0] #black
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image = Image.fromarray(buffer)
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return image
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def clear(self, colour='white'):
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if display_type == 'colour':
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packets = int(self.width / 2 * self.height)
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if display_type == 'black_and_white':
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packets = int(self.width / 4 * self.height)
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if colour == 'white': data = 0x33
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if colour == 'red': data = 0x04
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if colour == 'black': data = 0x00
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self.init()
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self.send_command(DATA_START_TRANSMISSION_1)
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[self.send_data(data) for _ in range(packets)]
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self.send_command(DISPLAY_REFRESH)
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print('waiting until E-Paper is not busy')
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self.delay_ms(100)
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self.wait_until_idle()
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print('E-Paper free')
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self.sleep()
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def get_frame_buffer(self, image):
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imwidth, imheight = image.size
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if imwidth == self.height and imheight == self.width:
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image = image.rotate(270, expand = True)
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print('Rotated image by 270 degrees...', end= '')
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elif imwidth != self.width or imheight != self.height:
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raise ValueError('Image must be same dimensions as display \
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({0}x{1}).' .format(self.width, self.height))
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else:
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print('Image size OK')
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imwidth, imheight = image.size
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if display_type == 'colour':
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buf = [0x00] * int(self.width * self.height / 4)
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image_grayscale = image.convert('L', dither=None)
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pixels = image_grayscale.load()
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for y in range(self.height):
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for x in range(self.width):
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# Set the bits for the column of pixels at the current position.
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if pixels[x, y] == 0: # black
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buf[int((x + y * self.width) / 4)] &= ~(0xC0 >> (x % 4 * 2))
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elif pixels[x, y] == 76: # convert gray to red
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buf[int((x + y * self.width) / 4)] &= ~(0xC0 >> (x % 4 * 2))
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buf[int((x + y * self.width) / 4)] |= 0x40 >> (x % 4 * 2)
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else: # white
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buf[int((x + y * self.width) / 4)] |= 0xC0 >> (x % 4 * 2)
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if display_type == 'black_and_white':
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buf = [0x00] * int(self.width * self.height / 8)
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image_monocolor = image.convert('1')
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pixels = image_monocolor.load()
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for y in range(self.height):
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for x in range(self.width):
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# Set the bits for the column of pixels at the current position.
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if pixels[x, y] != 0:
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buf[int((x + y * self.width) / 8)] |= 0x80 >> (x % 8)
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return buf
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def display_frame(self, frame_buffer):
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self.send_command(DATA_START_TRANSMISSION_1)
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if display_type == 'colour':
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for i in range(0, int(self.width / 4 * self.height)):
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temp1 = frame_buffer[i]
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j = 0
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while (j < 4):
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if ((temp1 & 0xC0) == 0xC0):
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temp2 = 0x03 #white
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elif ((temp1 & 0xC0) == 0x00):
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temp2 = 0x00 #black
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else:
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temp2 = 0x04 #red
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temp2 = (temp2 << 4) & 0xFF
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temp1 = (temp1 << 2) & 0xFF
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j += 1
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if((temp1 & 0xC0) == 0xC0):
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temp2 |= 0x03 #white
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elif ((temp1 & 0xC0) == 0x00):
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temp2 |= 0x00 #black
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else:
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temp2 |= 0x04 #red
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temp1 = (temp1 << 2) & 0xFF
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self.send_data(temp2)
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j += 1
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if display_type == 'black_and_white':
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for i in range(0, 30720):
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temp1 = frame_buffer[i]
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j = 0
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while (j < 8):
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if(temp1 & 0x80):
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temp2 = 0x03 #white
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else:
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temp2 = 0x00 #black
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temp2 = (temp2 << 4) & 0xFF
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temp1 = (temp1 << 1) & 0xFF
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j += 1
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if(temp1 & 0x80):
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temp2 |= 0x03 #white
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else:
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temp2 |= 0x00 #black
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temp1 = (temp1 << 1) & 0xFF
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self.send_data(temp2)
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j += 1
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self.send_command(DISPLAY_REFRESH)
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self.delay_ms(100)
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self.wait_until_idle()
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def show_image(self, image, reduce_colours = True):
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print('Initialising E-Paper Display...', end='')
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self.init()
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sleep(5)
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print('Done')
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if reduce_colours == True:
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print('Optimising Image for E-Paper displays...', end = '')
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image = self.reduce_colours(image)
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print('Done')
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else:
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print('No colour optimisation done on image')
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print('Creating image buffer and sending it to E-Paper display...', end='')
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data = self.get_frame_buffer(image)
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print('Done')
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print('Refreshing display...', end = '')
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self.display_frame(data)
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print('Done')
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print('Sending E-Paper to deep sleep mode...',end='')
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self.sleep()
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print('Done')
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def sleep(self):
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self.send_command(POWER_OFF)
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self.wait_until_idle()
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self.send_command(DEEP_SLEEP)
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self.send_data(0xa5)
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