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ladyadaladyada
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use mem buffer if no SRAM pin
1 parent c4002d0 commit 346a9d4

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2 files changed

+101
-55
lines changed

2 files changed

+101
-55
lines changed

‎adafruit_epd/epd.py

Lines changed: 6 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -68,7 +68,12 @@ def __init__(self, width, height, spi, cs_pin, dc_pin, sramcs_pin, rst_pin, busy
6868

6969
self.spi_device = spi
7070

71-
self.sram = mcp_sram.Adafruit_MCP_SRAM(sramcs_pin, spi)
71+
if sramcs_pin:
72+
self.sram = mcp_sram.Adafruit_MCP_SRAM(sramcs_pin, spi)
73+
else:
74+
self.sram = None
75+
self.bw_buffer = bytearray((width // 8) * height)
76+
self.red_buffer = bytearray((width // 8) * height)
7277

7378
if self._rst:
7479
self._rst.value = False

‎adafruit_epd/il0373.py

Lines changed: 95 additions & 54 deletions
Original file line numberDiff line numberDiff line change
@@ -118,54 +118,73 @@ def display(self):
118118
"""show the contents of the display buffer"""
119119
self.power_up()
120120

121-
while not self.spi_device.try_lock():
122-
pass
123-
self.sram.cs_pin.value = False
124-
#send read command
125-
self.spi_device.write(bytearray([Adafruit_MCP_SRAM.SRAM_READ]))
126-
#send start address
127-
self.spi_device.write(bytearray([0x00, 0x00]))
128-
self.spi_device.unlock()
129-
130-
#first data byte from SRAM will be transfered in at the
131-
#same time as the EPD command is transferred out
132-
cmd = self.command(IL0373_DTM1, end=False)
133-
134-
while not self.spi_device.try_lock():
135-
pass
136-
self._dc.value = True
137-
xfer = bytearray([cmd])
138-
outbuf = bytearray(1)
139-
for _ in range(self.bw_bufsize):
140-
outbuf[0] = xfer[0]
141-
self.spi_device.write_readinto(outbuf, xfer)
142-
self._cs.value = True
143-
self.sram.cs_pin.value = True
144-
145-
time.sleep(.002)
146-
147-
self.sram.cs_pin.value = False
148-
#send read command
149-
self.spi_device.write(bytearray([Adafruit_MCP_SRAM.SRAM_READ]))
150-
#send start address
151-
self.spi_device.write(bytearray([(self.bw_bufsize >> 8), (self.bw_bufsize & 0xFF)]))
152-
self.spi_device.unlock()
153-
154-
#first data byte from SRAM will be transfered in at the
155-
#same time as the EPD command is transferred out
156-
cmd = self.command(IL0373_DTM2, end=False)
157-
158-
while not self.spi_device.try_lock():
159-
pass
160-
self._dc.value = True
161-
xfer = bytearray([cmd])
162-
outbuf = bytearray(1)
163-
for _ in range(self.bw_bufsize):
164-
outbuf[0] = xfer[0]
165-
self.spi_device.write_readinto(outbuf, xfer)
166-
self._cs.value = True
167-
self.sram.cs_pin.value = True
168-
self.spi_device.unlock()
121+
if self.sram:
122+
while not self.spi_device.try_lock():
123+
pass
124+
self.sram.cs_pin.value = False
125+
#send read command
126+
self.spi_device.write(bytearray([Adafruit_MCP_SRAM.SRAM_READ]))
127+
#send start address
128+
self.spi_device.write(bytearray([0x00, 0x00]))
129+
self.spi_device.unlock()
130+
131+
#first data byte from SRAM will be transfered in at the
132+
#same time as the EPD command is transferred out
133+
cmd = self.command(IL0373_DTM1, end=False)
134+
135+
while not self.spi_device.try_lock():
136+
pass
137+
self._dc.value = True
138+
xfer = bytearray([cmd])
139+
outbuf = bytearray(1)
140+
for _ in range(self.bw_bufsize):
141+
outbuf[0] = xfer[0]
142+
self.spi_device.write_readinto(outbuf, xfer)
143+
self._cs.value = True
144+
self.sram.cs_pin.value = True
145+
146+
time.sleep(.002)
147+
148+
self.sram.cs_pin.value = False
149+
#send read command
150+
self.spi_device.write(bytearray([Adafruit_MCP_SRAM.SRAM_READ]))
151+
#send start address
152+
self.spi_device.write(bytearray([(self.bw_bufsize >> 8), (self.bw_bufsize & 0xFF)]))
153+
self.spi_device.unlock()
154+
155+
#first data byte from SRAM will be transfered in at the
156+
#same time as the EPD command is transferred out
157+
cmd = self.command(IL0373_DTM2, end=False)
158+
159+
while not self.spi_device.try_lock():
160+
pass
161+
self._dc.value = True
162+
xfer = bytearray([cmd])
163+
outbuf = bytearray(1)
164+
for _ in range(self.bw_bufsize):
165+
outbuf[0] = xfer[0]
166+
self.spi_device.write_readinto(outbuf, xfer)
167+
self._cs.value = True
168+
self.sram.cs_pin.value = True
169+
self.spi_device.unlock()
170+
else:
171+
cmd = self.command(IL0373_DTM1, end=False)
172+
while not self.spi_device.try_lock():
173+
pass
174+
self._dc.value = True
175+
self.spi_device.write(self.bw_buffer)
176+
self._cs.value = True
177+
self.spi_device.unlock()
178+
179+
time.sleep(.02)
180+
181+
cmd = self.command(IL0373_DTM2, end=False)
182+
while not self.spi_device.try_lock():
183+
pass
184+
self._dc.value = True
185+
self.spi_device.write(self.red_buffer)
186+
self._cs.value = True
187+
self.spi_device.unlock()
169188

170189
self.update()
171190

@@ -210,9 +229,17 @@ def draw_pixel(self, x, y, color):
210229
x = 1
211230

212231
addr = ((self.width - x) * self.height + y) // 8
213-
if color == Adafruit_EPD.RED:
214-
addr = addr + self.bw_bufsize
215-
current = self.sram.read8(addr)
232+
233+
if self.sram:
234+
if color == Adafruit_EPD.RED:
235+
current = self.sram.read8(addr + self.bw_bufsize)
236+
else:
237+
current = self.sram.read8(addr)
238+
else:
239+
if color == Adafruit_EPD.RED:
240+
current = self.red_buffer[addr]
241+
else:
242+
current = self.bw_buffer[addr]
216243

217244
if color == Adafruit_EPD.WHITE:
218245
current = current | (1 << (7 - y%8))
@@ -221,7 +248,16 @@ def draw_pixel(self, x, y, color):
221248
elif color == Adafruit_EPD.INVERSE:
222249
current = current ^ (1 << (7 - y%8))
223250

224-
self.sram.write8(addr, current)
251+
if self.sram:
252+
if color == Adafruit_EPD.RED:
253+
current = self.sram.write8(addr + self.bw_bufsize, current)
254+
else:
255+
current = self.sram.write8(addr, current)
256+
else:
257+
if color == Adafruit_EPD.RED:
258+
self.red_buffer[addr] = current
259+
else:
260+
self.bw_buffer[addr] = current
225261
return
226262

227263
def fill(self, color):
@@ -232,5 +268,10 @@ def fill(self, color):
232268
black_fill = 0x00
233269
if color == Adafruit_EPD.RED:
234270
red_fill = 0x00
235-
self.sram.erase(0x00, self.bw_bufsize, black_fill)
236-
self.sram.erase(self.bw_bufsize, self.red_bufsize, red_fill)
271+
if self.sram:
272+
self.sram.erase(0x00, self.bw_bufsize, black_fill)
273+
self.sram.erase(self.bw_bufsize, self.red_bufsize, red_fill)
274+
else:
275+
for i in range(len(self.bw_buffer)):
276+
self.bw_buffer[i] = black_fill
277+
self.red_buffer[i] = red_fill

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