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Fix 7.5/7.5B partial update integer underflow #46

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Fix 7.5/7.5B partial update integer underflow #46

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4 changes: 2 additions & 2 deletions c/lib/e-Paper/EPD_7in5_V2.c
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Original file line number Diff line number Diff line change
Expand Up @@ -349,13 +349,13 @@ void EPD_7IN5_V2_Display_Part(UBYTE *blackimage,UDOUBLE x_start, UDOUBLE y_start
EPD_SendData (x_start%256); //x-start

EPD_SendData (x_end/256);
EPD_SendData (x_end%256-1); //x-end
EPD_SendData ((x_end-1)%256); //x-end

EPD_SendData (y_start/256); //
EPD_SendData (y_start%256); //y-start

EPD_SendData (y_end/256);
EPD_SendData (y_end%256-1); //y-end
EPD_SendData ((y_end-1)%256); //y-end
EPD_SendData (0x01);

EPD_SendCommand(0x13);
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4 changes: 2 additions & 2 deletions c/lib/e-Paper/EPD_7in5b_V2.c
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Original file line number Diff line number Diff line change
Expand Up @@ -323,13 +323,13 @@ void EPD_7IN5B_V2_Display_Partial(const UBYTE *Image, UWORD Xstart, UWORD Ystart
EPD_7IN5B_V2_SendData(Xstart%256); //x-start

EPD_7IN5B_V2_SendData(Xend/256);
EPD_7IN5B_V2_SendData(Xend%256-1); //x-end
EPD_7IN5B_V2_SendData((Xend-1)%256); //x-end

EPD_7IN5B_V2_SendData(Ystart/256); //
EPD_7IN5B_V2_SendData(Ystart%256); //y-start

EPD_7IN5B_V2_SendData(Yend/256);
EPD_7IN5B_V2_SendData(Yend%256-1); //y-end
EPD_7IN5B_V2_SendData((Yend-1)%256); //y-end
EPD_7IN5B_V2_SendData(0x01);

EPD_7IN5B_V2_SendCommand(0x10); //Write Black and White image to RAM
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