EpdSetBuffer()
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EpdSetBuffer(bWorkingBuffer As bWorkingBuffer)
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Parameter |
Description |
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bWorkingBuffer |
Selects the active working buffer: |
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EPD_Buffer_A |
automatic buffer management |
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EPD_Buffer_1 |
sets buffer 1 as currently active |
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EPD_Buffer_2 |
sets buffer 2 as currently active |
Selects the current working buffer.
Current working buffer is the frame buffer that drawing operations write into while building the image.
This is useful when there isn't enough RAM/SRAM for two full buffers on a BWR/BWY display, where each plane would normally get its own.
Managing a single buffer manually this way requires more careful planning of your image-building sequence, since the order in which colors and planes are written matters: Red/Yellow, for instance, takes visual precedence over Black/White wherever both would otherwise apply to the same pixel.
Note: Unlike EpdSetPlane(), this does not automatically revert to automatic management — once set manually, it stays as you left it until you explicitly change it again.
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$define EpdFrameBuffer RAM_1 ... EpdResetScreen(WHITE) 'Reset screen to white 'bWorkingBuffer = EPD_Buffer_1 'Set working buffer to 1 (disable automatic buffer management) EpdSetBuffer(EPD_Buffer_1) 'Same as above - set working buffer To 1 (Disable automatic buffer management) EpdSetPlane(EPD_Plane_RY) 'Set working plane to RY EpdRstBuffer1(BLACK) 'Reset buffer1 to 0 EpdSetOrientation(0) 'Rotate working plane 90 degrees TftSetBdfFont(0) 'Set current BDF font to #0 TftPrintBdfString("PC", 120,20,199,0,RED,WHITE,1) 'Print string with set BDF font TftRectangleSNTC(268,0, 386,37, RED) 'Draw rectangle around text TftSetSndFont(15,0) TftPrintSndString("SSD1683", 1,272,19,0, BLACK,RED,1) 'Print string, Red part TftPrintSndString("400x300", 1,272,3,0, BLACK,RED,1) 'Print string, Red part EpdSendBuffers() 'Send buffers to EPD RAM EpdSetPlane(EPD_Plane_BW) 'Set working plane to BW EpdRstBuffer1(WHITE) 'Reset buffer1 to 1 EpdSetOrientation(1) 'Rotate working plane 180 degrees EpdBmpFromCode(BAR_300, 0,315) 'Draw Cat picture from FLASH code TftSetSndFont(0,0) 'Set current SND font to #0 TftPrintSndString("POSITRON COMPILER",1,82,295,0, BLACK,WHITE,0)'Print string EpdSetOrientation(0) 'Rotate working plane 90 degrees EpdBmpFromCode(ATOM_200, 120,50) 'Draw Cat picture from FLASH code EpdBmpFromCode(QR_92, 306,206) 'Draw Cat picture from FLASH code TftSetSndFont(15,0) 'Set current SND font to #15 TftPrintSndString("SSD1683", 1,272,19,0, BLACK,RED,1) 'Print string, Black part TftPrintSndString("400x300", 1,272,3,0, BLACK,RED,1) 'Print string, Black part TftRectangleENTC(268,0, 386,37, BLACK) 'Draw rectangle around text TftSetSndFont(5,0) 'Set current SND font to #5 TftPrintSndString("BuyDisplay 4.2", 1,271,40,0, BLACK,WHITE,0) 'Print string EpdSendBuffers() 'Send buffers to EPD RAM EpdFrameUpdate(EPD_UPDATE_NORMAL) 'Update EPD screen |
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