ER-OLEDM032-1
ER-OLEDM032-1 copied to clipboard
topherCantrell
Magic offset of X coordinate
Again, not an issue, more of a question.
There is a function:
def set_data_window(self,x,y,width,height):
x = int(x / 4) # Column address is 4-pixel-groups (2 bytes)
# Pass in x=0,4,8, etc
width = int(width / 4) # With limited to 4-pixel increments
# Pass in width=4,8, etc
self.Write_Instruction(0x75)
self.Write_Data(y)
self.Write_Data(y+height-1)
self.Write_Instruction(0x15)
self.Write_Data(0x1C+x) <<<<
self.Write_Data(0x1C+x+width-1) <<<<
for some unexplained reason there is an additional offset 0x1C that is added to the X coordinates (i.e. column address).
I'm aware that this offset got here from the example code (where it's not explained either); but maybe you know why is it required?
The only thing I can think of is that the driver will work for up to 480x128 p;ixels. This offset must be how the 256x64 is wired
On Mon, Feb 3, 2020 at 8:02 AM Amomum [email protected] wrote:
Again, not an issue, more of a question.
There is a function:
def set_data_window(self,x,y,width,height):
x = int(x / 4) # Column address is 4-pixel-groups (2 bytes) # Pass in x=0,4,8, etc width = int(width / 4) # With limited to 4-pixel increments # Pass in width=4,8, etc self.Write_Instruction(0x75) self.Write_Data(y) self.Write_Data(y+height-1) self.Write_Instruction(0x15) self.Write_Data(0x1C+x) <<<< self.Write_Data(0x1C+x+width-1) <<<<for some unexplained reason there is an additional offset 0x1C that is added to the X coordinates (i.e. column address).
I'm aware that this offset got here from the example code (where it's not explained either); but maybe you know why is it required?
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