181 lines
6.9 KiB
Python
181 lines
6.9 KiB
Python
import epdif
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from PIL import Image
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import RPi.GPIO as GPIO
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# Display resolution
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EPD_WIDTH = 640
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EPD_HEIGHT = 384
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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 = epdif.RST_PIN
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self.dc_pin = epdif.DC_PIN
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self.busy_pin = epdif.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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epdif.epd_digital_write(pin, value)
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def digital_read(self, pin):
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return epdif.epd_digital_read(pin)
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def delay_ms(self, delaytime):
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epdif.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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# the parameter type is list but not int
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# so use [command] instead of command
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epdif.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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# the parameter type is list but not int
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# so use [data] instead of data
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epdif.spi_transfer([data])
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def init(self):
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if (epdif.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 get_frame_buffer(self, image):
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buf = [0x00] * int(self.width * self.height / 4)
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# Set buffer to value of Python Imaging Library image.
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# Image must be in mode L.
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image_grayscale = image.convert('L', dither=None)
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imwidth, imheight = image_grayscale.size
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if 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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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] < 75: #was 64 # black
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buf[int((x + y * self.width) / 4)] &= ~(0xC0 >> (x % 4 * 2))
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elif pixels[x, y] < 110: #was 192 # 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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return buf #due to python2 -> python3, int had to be added in 'get_frame
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#_buffer
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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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for i in range(0, int(self.width / 4 * self.height)):
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#the above line had to be modified due to python2 -> python3
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#the issue lies in division, which returns integers in python2
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#but floats in python3
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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
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elif ((temp1 & 0xC0) == 0x00):
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temp2 = 0x00
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else:
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temp2 = 0x04
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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
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elif ((temp1 & 0xC0) == 0x00):
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temp2 |= 0x00
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else:
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temp2 |= 0x04
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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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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 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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