Chameleon-AVR Nurve Networks, Chameleon-AVR Datasheet - Page 193

• Manufacturer Part Number: Chameleon-AVR
• Description: MCU, MPU & DSP Development Tools AVR8 & PROPELLER DEV SYSTEM (SBC)
• Manufacturer: Nurve Networks

Specifications of Chameleon-AVR

• Processor To Be Evaluated: AVR 328P
• Data Bus Width: 8 bit
• Interface Type: USB, VGA, PS/2, I2C, ISP, SPI
• Operating Supply Voltage: 3.3 V, 5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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Function Prototype:
Description:
Example(s): Set the tilemap width to 128 tiles which is 4 complete screenfull's of tiles for horizontal scrolling.
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Function Prototype:
Description:
Example(s):
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Function Prototype:
Description:
Example(s):
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Function Prototype:
Description:
int GFX_Set_Tilemap_Width(int width);
int GFX_Get_Bottom_Overscan_Color(void);
int GFX_Get_Top_Overscan_Color(void);
int GFX_Set_Bottom_Overscan_Color(int col);
Retrieve the current bottom overscan color.
Retrieve the current top overscan color.
encoded as 0,1,2,3 with the parameter width. The idea of this function call is to set the virtual playfield of
the tilemap to large than its physical size which is always 32 tiles. Doing so allows for horizontal scrolling
(course). Returns 1.
bottom overscan is a few lines at the bottom of the screen that no tiles are drawn into. Usually this area is
black on normal broadcasts of TV programs, but the driver allows you to change the color. The returned
color value will be in Propeller color format [chroma 4-bit | chroma enable 1-bit | luma 3-bit].
top overscan is a few lines at the top of the screen that no tiles are drawn into. Usually this area is black
on normal broadcasts of TV programs, but the driver allows you to change the color. The returned color
value will be in Propeller color format [chroma 4-bit | chroma enable 1-bit | luma 3-bit].
GFX_Set_Tilemap_Width(…) sets the width of the tile map to 32, 64, 128 or 256 which are
GFX_Get_Bottom_Overscan_Color() retrieves the bottom overscan color of the NTSC driver. The
GFX_Get_Top_Overscan_Color() retrieves the top overscan color of the NTSC driver. The
GFX_Set_Bottom_Overscan_Color(…) sets the bottom overscan color to col where col is in normal
© 2009 NURVE NETWORKS LLC “Exploring the Chameleon AVR 8-Bit”
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