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ssd1306 display 'rotate' method #4015

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robhamerling opened this issue Aug 3, 2018 · 2 comments
Closed

ssd1306 display 'rotate' method #4015

robhamerling opened this issue Aug 3, 2018 · 2 comments

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@robhamerling
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For some reason unknown to me the ssd1306.py driver uses the display 'upside down'. Of course this arbitrary, but what I mean: rows and columns are initialised 'mirrored' in __init().

SET_SEG_REMAP | 0x01, # column addr 127 mapped to SEG0
SET_COM_OUT_DIR | 0x08, # scan from COM[N] to COM0

I would like to use this display 'upside-up', but the driver has no 'rotate' method (like I found in the sh1106 driver). For example:

def rotate(self, flag):
    if flag:
        self.write_cmd(SET_COM_OUT_DIR)             # mirror vertically
        self.write_cmd(SET_SEG_REMAP)               # mirror horizontally (64 rows)
    else:
        self.write_cmd(SET_COM_OUT_DIR | 0x08)
        self.write_cmd(SET_SEG_REMAP | 0x01)`

Note: This addition works fine for my 64-rows display, but needs to be improved to support both 32 and 64 rows. May I suggest to add this rotate-facility to the standard driver?
@mcauser
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mcauser commented Apr 20, 2021

Implemented in #7135

@WoodRobotics
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Why did I write this? Thanks for saving me some cycles.

mirrored_Buffer = bytearray(self.pages * self.width)

for page in range(0, self.pages):
    for column in range(0, self.width):
    
        page_inverse = (self.pages - 1) - page
        column_inverse = (self.width - 1) - column
        
        pixel = self.buffer[(self.width * page) + column]
        pixel_inverse = 0
        
        for index in range(0, 8):
            pixel_inverse = (pixel_inverse << 1) | (pixel >> index & 1)
            
        mirrored_Buffer[(self.width * page_inverse) + column_inverse] = pixel_inverse

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4 participants
@mcauser @dpgeorge @robhamerling @WoodRobotics