#!/usr/bin/python3
# -*- coding: utf-8 -*-
"""
Drivers file for Inky-Calendar software.
Handles E-Paper display related tasks
"""
from PIL import Image
import RPi.GPIO as GPIO
from settings import display_type
import numpy
import spidev
import RPi.GPIO as GPIO
from time import sleep
RST_PIN = 17
DC_PIN = 25
CS_PIN = 8
BUSY_PIN = 24
EPD_WIDTH = 640
EPD_HEIGHT = 384
SPI = spidev.SpiDev(0, 0)
def epd_digital_write(pin, value):
GPIO.output(pin, value)
def epd_digital_read(pin):
return GPIO.input(BUSY_PIN)
def epd_delay_ms(delaytime):
sleep(delaytime / 1000.0)
def spi_transfer(data):
SPI.writebytes(data)
def epd_init():
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(RST_PIN, GPIO.OUT)
GPIO.setup(DC_PIN, GPIO.OUT)
GPIO.setup(CS_PIN, GPIO.OUT)
GPIO.setup(BUSY_PIN, GPIO.IN)
SPI.max_speed_hz = 4000000
SPI.mode = 0b00
return 0;
# EPD7IN5 commands
PANEL_SETTING = 0x00
POWER_SETTING = 0x01
POWER_OFF = 0x02
POWER_OFF_SEQUENCE_SETTING = 0x03
POWER_ON = 0x04
POWER_ON_MEASURE = 0x05
BOOSTER_SOFT_START = 0x06
DEEP_SLEEP = 0x07
DATA_START_TRANSMISSION_1 = 0x10
DATA_STOP = 0x11
DISPLAY_REFRESH = 0x12
IMAGE_PROCESS = 0x13
LUT_FOR_VCOM = 0x20
LUT_BLUE = 0x21
LUT_WHITE = 0x22
LUT_GRAY_1 = 0x23
LUT_GRAY_2 = 0x24
LUT_RED_0 = 0x25
LUT_RED_1 = 0x26
LUT_RED_2 = 0x27
LUT_RED_3 = 0x28
LUT_XON = 0x29
PLL_CONTROL = 0x30
TEMPERATURE_SENSOR_COMMAND = 0x40
TEMPERATURE_CALIBRATION = 0x41
TEMPERATURE_SENSOR_WRITE = 0x42
TEMPERATURE_SENSOR_READ = 0x43
VCOM_AND_DATA_INTERVAL_SETTING = 0x50
LOW_POWER_DETECTION = 0x51
TCON_SETTING = 0x60
TCON_RESOLUTION = 0x61
SPI_FLASH_CONTROL = 0x65
REVISION = 0x70
GET_STATUS = 0x71
AUTO_MEASUREMENT_VCOM = 0x80
READ_VCOM_VALUE = 0x81
VCM_DC_SETTING = 0x82
class EPD:
def __init__(self):
self.reset_pin = RST_PIN
self.dc_pin = DC_PIN
self.busy_pin = BUSY_PIN
self.width = EPD_WIDTH
self.height = EPD_HEIGHT
def digital_write(self, pin, value):
epd_digital_write(pin, value)
def digital_read(self, pin):
return epd_digital_read(pin)
def delay_ms(self, delaytime):
epd_delay_ms(delaytime)
def send_command(self, command):
self.digital_write(self.dc_pin, GPIO.LOW)
spi_transfer([command])
def send_data(self, data):
self.digital_write(self.dc_pin, GPIO.HIGH)
spi_transfer([data])
def init(self):
if (epd_init() != 0):
return -1
self.reset()
self.send_command(POWER_SETTING)
self.send_data(0x37)
self.send_data(0x00)
self.send_command(PANEL_SETTING)
self.send_data(0xCF)
self.send_data(0x08)
self.send_command(BOOSTER_SOFT_START)
self.send_data(0xc7)
self.send_data(0xcc)
self.send_data(0x28)
self.send_command(POWER_ON)
self.wait_until_idle()
self.send_command(PLL_CONTROL)
self.send_data(0x3c)
self.send_command(TEMPERATURE_CALIBRATION)
self.send_data(0x00)
self.send_command(VCOM_AND_DATA_INTERVAL_SETTING)
self.send_data(0x77)
self.send_command(TCON_SETTING)
self.send_data(0x22)
self.send_command(TCON_RESOLUTION)
self.send_data(0x02) #source 640
self.send_data(0x80)
self.send_data(0x01) #gate 384
self.send_data(0x80)
self.send_command(VCM_DC_SETTING)
self.send_data(0x1E) #decide by LUT file
self.send_command(0xe5) #FLASH MODE
self.send_data(0x03)
def wait_until_idle(self):
while(self.digital_read(self.busy_pin) == 0): # 0: busy, 1: idle
self.delay_ms(100)
def reset(self):
self.digital_write(self.reset_pin, GPIO.LOW) # module reset
self.delay_ms(200)
self.digital_write(self.reset_pin, GPIO.HIGH)
self.delay_ms(200)
def calibrate_display(self, no_of_cycles):
"""Function for Calibration"""
if display_type == 'colour':
packets = int(self.width / 2 * self.height)
if display_type == 'black_and_white':
packets = int(self.width / 4 * self.height)
white, red, black = 0x33, 0x04, 0x00
self.init()
print('----------Started calibration of E-Paper display----------')
for _ in range(no_of_cycles):
self.send_command(DATA_START_TRANSMISSION_1)
print('Calibrating black...')
[self.send_data(black) for i in range(packets)]
self.send_command(DISPLAY_REFRESH)
self.wait_until_idle()
if display_type == 'colour':
print('Calibrating red...')
self.send_command(DATA_START_TRANSMISSION_1)
[self.send_data(red) for i in range(packets)]
self.send_command(DISPLAY_REFRESH)
self.wait_until_idle()
print('Calibrating white...')
self.send_command(DATA_START_TRANSMISSION_1)
[self.send_data(white) for i in range(packets)]
self.send_command(DISPLAY_REFRESH)
self.wait_until_idle()
print('Cycle {0} of {1} complete'.format(_+1, no_of_cycles))
print('-----------Calibration complete----------')
self.sleep()
def reduce_colours(self, image):
buffer = numpy.array(image)
r,g,b = buffer[:,:,0], buffer[:,:,1], buffer[:,:,2]
if display_type == "colour":
buffer[numpy.logical_and(r <= 180, r == g)] = [0,0,0] #black
buffer[numpy.logical_and(r >= 150, g >= 150)] = [255,255,255] #white
buffer[numpy.logical_and(r >= 150, g <= 90)] = [255,0,0] #red
image = Image.fromarray(buffer)
return image
def clear(self, colour='white'):
if display_type == 'colour':
packets = int(self.width / 2 * self.height)
if display_type == 'black_and_white':
packets = int(self.width / 4 * self.height)
if colour == 'white': data = 0x33
if colour == 'red': data = 0x04
if colour == 'black': data = 0x00
self.init()
self.send_command(DATA_START_TRANSMISSION_1)
[self.send_data(data) for _ in range(packets)]
self.send_command(DISPLAY_REFRESH)
print('waiting until E-Paper is not busy')
self.delay_ms(100)
self.wait_until_idle()
print('E-Paper free')
self.sleep()
def get_frame_buffer(self, image):
imwidth, imheight = image.size
if imwidth == self.height and imheight == self.width:
image = image.rotate(270, expand = True)
print('Rotated image by 270 degrees...', end= '')
elif imwidth != self.width or imheight != self.height:
raise ValueError('Image must be same dimensions as display \
({0}x{1}).' .format(self.width, self.height))
else:
print('Image size OK')
imwidth, imheight = image.size
if display_type == 'colour':
buf = [0x00] * int(self.width * self.height / 4)
image_grayscale = image.convert('L')
pixels = image_grayscale.load()
for y in range(self.height):
for x in range(self.width):
# Set the bits for the column of pixels at the current position.
if pixels[x, y] == 0: # black
buf[int((x + y * self.width) / 4)] &= ~(0xC0 >> (x % 4 * 2))
elif pixels[x, y] == 76: # convert gray to red
buf[int((x + y * self.width) / 4)] &= ~(0xC0 >> (x % 4 * 2))
buf[int((x + y * self.width) / 4)] |= 0x40 >> (x % 4 * 2)
else: # white
buf[int((x + y * self.width) / 4)] |= 0xC0 >> (x % 4 * 2)
if display_type == 'black_and_white':
buf = [0x00] * int(self.width * self.height / 8)
image_monocolor = image.convert('1', dither = True)
pixels = image_monocolor.load()
for y in range(self.height):
for x in range(self.width):
# Set the bits for the column of pixels at the current position.
if pixels[x, y] != 0:
buf[int((x + y * self.width) / 8)] |= 0x80 >> (x % 8)
return buf
def display_frame(self, frame_buffer):
self.send_command(DATA_START_TRANSMISSION_1)
if display_type == 'colour':
for i in range(0, int(self.width / 4 * self.height)):
temp1 = frame_buffer[i]
j = 0
while (j < 4):
if ((temp1 & 0xC0) == 0xC0):
temp2 = 0x03 #white
elif ((temp1 & 0xC0) == 0x00):
temp2 = 0x00 #black
else:
temp2 = 0x04 #red
temp2 = (temp2 << 4) & 0xFF
temp1 = (temp1 << 2) & 0xFF
j += 1
if((temp1 & 0xC0) == 0xC0):
temp2 |= 0x03 #white
elif ((temp1 & 0xC0) == 0x00):
temp2 |= 0x00 #black
else:
temp2 |= 0x04 #red
temp1 = (temp1 << 2) & 0xFF
self.send_data(temp2)
j += 1
if display_type == 'black_and_white':
for i in range(0, 30720):
temp1 = frame_buffer[i]
j = 0
while (j < 8):
if(temp1 & 0x80):
temp2 = 0x03 #white
else:
temp2 = 0x00 #black
temp2 = (temp2 << 4) & 0xFF
temp1 = (temp1 << 1) & 0xFF
j += 1
if(temp1 & 0x80):
temp2 |= 0x03 #white
else:
temp2 |= 0x00 #black
temp1 = (temp1 << 1) & 0xFF
self.send_data(temp2)
j += 1
self.send_command(DISPLAY_REFRESH)
self.delay_ms(100)
self.wait_until_idle()
def show_image(self, image, reduce_colours = True):
print('Initialising E-Paper Display...', end='')
self.init()
sleep(5)
print('Done')
if reduce_colours == True:
print('Optimising Image for E-Paper displays...', end = '')
image = self.reduce_colours(image)
print('Done')
else:
print('No colour optimisation done on image')
print('Creating image buffer and sending it to E-Paper display...', end='')
data = self.get_frame_buffer(image)
print('Done')
print('Refreshing display...', end = '')
self.display_frame(data)
print('Done')
print('Sending E-Paper to deep sleep mode...',end='')
self.sleep()
print('Done')
def sleep(self):
self.send_command(POWER_OFF)
self.wait_until_idle()
self.send_command(DEEP_SLEEP)
self.send_data(0xa5)