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Use saner names for the pin attributes #4

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Merged
merged 3 commits into from
Dec 16, 2017
Merged

Use saner names for the pin attributes #4

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6374df7
Use saner names for the pin attributes
deshipu Dec 16, 2017
dbbd87a
Add docstrings explaining the parameters
deshipu Dec 16, 2017
eba607f
removed trailing whitespace
kattni Dec 16, 2017
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33 changes: 24 additions & 9 deletions adafruit_ssd1306.py
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Original file line number Diff line number Diff line change
Expand Up @@ -131,7 +131,14 @@ def text(self, string, xpos, ypos, col=1):
self.framebuf.text(string, xpos, ypos, col)

class SSD1306_I2C(_SSD1306):
""" I2C class for SSD1306
"""
I2C class for SSD1306

:param width: the width of the physical screen in pixels,
:param height: the height of the physical screen in pixels,
:param i2c: the I2C peripheral to use,
:param addr: the 8-bit bus address of the device,
:param external_vcc: whether external high-voltage source is connected.
"""

def __init__(self, width, height, i2c, *, addr=0x3c, external_vcc=False):
Expand Down Expand Up @@ -167,7 +174,15 @@ def poweron(self):

#pylint: disable-msg=too-many-arguments
class SSD1306_SPI(_SSD1306):
""" SPI class for SSD1306
"""
SPI class for SSD1306

:param width: the width of the physical screen in pixels,
:param height: the height of the physical screen in pixels,
:param spi: the SPI peripheral to use,
:param dc: the data/command pin to use (often labeled "D/C"),
:param res: the reset pin to use,
:param cs: the chip-select pin to use (sometimes labeled "SS").
"""
def __init__(self, width, height, spi, dc, res, cs, *,
external_vcc=False, baudrate=8000000, polarity=0, phase=0):
Expand All @@ -176,28 +191,28 @@ def __init__(self, width, height, spi, dc, res, cs, *,
res.switch_to_output(value=0)
self.spi_device = spi_device.SPIDevice(spi, cs, baudrate=baudrate,
polarity=polarity, phase=phase)
self.d_or_c = dc
self.res = res
self.dc_pin = dc
self.reset_pin = res
self.buffer = bytearray((height // 8) * width)
framebuffer = framebuf.FrameBuffer1(self.buffer, width, height)
super().__init__(framebuffer, width, height, external_vcc)

def write_cmd(self, cmd):
"""Send a command to the SPI device"""
self.d_or_c.value = 0
self.dc_pin.value = 0
with self.spi_device as spi:
spi.write(bytearray([cmd]))

def write_framebuf(self):
"""write to the frame buffer via SPI"""
self.d_or_c.value = 1
self.dc_pin.value = 1
with self.spi_device as spi:
spi.write(self.buffer)

def poweron(self):
"""Turn power off on the device"""
self.res.value = 1
self.reset_pin.value = 1
time.sleep(0.001)
self.res.value = 0
self.reset_pin.value = 0
time.sleep(0.010)
self.res.value = 1
self.reset_pin.value = 1