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Added rotate180 #7

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Added rotate180 #7

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16 changes: 16 additions & 0 deletions ssd1306.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,14 @@
from micropython import const
import framebuf

# Kongduino: 2023/01/08 Added rotate180
# invert: used with rotate180. moves bits 0-7 to 7-0
def invert(a):
c = 0
for i in range (0, 8):
b = (a>>i) & 1
c = ((c << 1) | b) & 0xff
return c

# register definitions
SET_CONTRAST = const(0x81)
Expand Down Expand Up @@ -100,6 +108,14 @@ def show(self):
self.write_cmd(self.pages - 1)
self.write_data(self.buffer)

# rotates the framebuffer by 180°
def rotate180(self):
last = 1023
for i in range(0, 512):
x = invert(self.buffer[i])
self.buffer[i] = invert(self.buffer[last])
self.buffer[last] = x
last -= 1

class SSD1306_I2C(SSD1306):
def __init__(self, width, height, i2c, addr=0x3C, external_vcc=False):
Expand Down