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fix up bitmap example

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This commit is contained in:
ladyada 2019-03-31 19:36:17 -04:00
parent 09f16e05d5
commit 0f8584fe67
1 changed files with 42 additions and 23 deletions
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57
examples/epd_bitmap.py
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@ -3,24 +3,34 @@ import busio
import board
from adafruit_epd.epd import Adafruit_EPD
from adafruit_epd.il0373 import Adafruit_IL0373
from adafruit_epd.il91874 import Adafruit_IL91874
from adafruit_epd.il0398 import Adafruit_IL0398
# create the spi device and pins we will need
spi = busio.SPI(board.SCK, MOSI=board.MOSI, MISO=board.MISO)
ecs = digitalio.DigitalInOut(board.D10)
dc = digitalio.DigitalInOut(board.D9)
srcs = digitalio.DigitalInOut(board.D8)
rst = digitalio.DigitalInOut(board.D7)
busy = digitalio.DigitalInOut(board.D6)
srcs = digitalio.DigitalInOut(board.D7) # can be None to use internal memory
rst = digitalio.DigitalInOut(board.D11) # can be None to not use this pin
busy = digitalio.DigitalInOut(board.D12) # can be None to not use this pin
# give them all to our driver
display = Adafruit_IL0373(152, 152, spi,
print("Creating display")
#display = Adafruit_IL91874(176, 264, spi, # 2.7" Tri-color display
#display = Adafruit_IL0373(152, 152, spi, # 1.54" Tri-color display
#display = Adafruit_IL0373(128, 296, spi, # 2.9" Tri-color display
#display = Adafruit_IL0398(400, 300, spi, # 4.2" Tri-color display
display = Adafruit_IL0373(104, 212, spi, # 2.13" Tri-color display
cs_pin=ecs, dc_pin=dc, sramcs_pin=srcs,
rst_pin=rst, busy_pin=busy)
FILENAME = "blinka.bmp"
# IF YOU HAVE A FLEXIBLE DISPLAY (2.13" or 2.9") uncomment these lines!
#display.set_black_buffer(1, False)
#display.set_color_buffer(1, False)
# clear the buffer
display.fill(Adafruit_EPD.WHITE)
display.rotation = 3
FILENAME = "blinka.bmp"
def read_le(s):
# as of this writting, int.from_bytes does not have LE support, DIY!
@ -35,9 +45,15 @@ class BMPError(Exception):
pass
def display_bitmap(epd, filename):
try:
with open("/" + FILENAME, "rb") as f:
f = open("/" + filename, "rb")
except OSError:
print("Couldn't open file")
return
print("File opened")
try:
if f.read(2) != b'BM': # check signature
raise BMPError("Not BitMap file")
@ -68,6 +84,7 @@ try:
rowSize = (bmpWidth * 3 + 3) & ~3 # 32-bit line boundary
for row in range(bmpHeight): # For each scanline...
print(row)
if flip: # Bitmap is stored bottom-to-top order (normal BMP)
pos = bmpImageoffset + (bmpHeight - 1 - row) * rowSize
else: # Bitmap is stored top-to-bottom
@ -75,22 +92,24 @@ try:
# print ("seek to %d" % pos)
f.seek(pos)
rowdata = f.read(3*bmpWidth)
for col in range(bmpWidth):
b, g, r = bytearray(f.read(3)) # BMP files store RGB in BGR
b, g, r = rowdata[3*col:3*col+3] # BMP files store RGB in BGR
if r < 0x80 and g < 0x80 and b < 0x80:
display.pixel(row, col, Adafruit_EPD.BLACK)
epd.pixel(col, row, Adafruit_EPD.BLACK)
elif r >= 0x80 and g >= 0x80 and b >= 0x80:
display.pixel(row, col, Adafruit_EPD.WHITE)
pass #epd.pixel(row, col, Adafruit_EPD.WHITE)
elif r >= 0x80:
display.pixel(row, col, Adafruit_EPD.RED)
except OSError as e:
if e.args[0] == 28:
raise OSError("OS Error 28 0.25")
else:
raise OSError("OS Error 0.5")
epd.pixel(col, row, Adafruit_EPD.RED)
except OSError:
print("Couldn't read file")
except BMPError as e:
print("Failed to parse BMP: " + e.args[0])
finally:
f.close()
print("Finished drawing")
# clear the buffer
display.fill(Adafruit_EPD.WHITE)
display_bitmap(display, FILENAME)
display.display()