Chameleon-PIC Nurve Networks, Chameleon-PIC Datasheet - Page 194

• Manufacturer Part Number: Chameleon-PIC
• Description: MCU, MPU & DSP Development Tools PIC24 & PROPELLER DEV SYSTEM (SBC)
• Manufacturer: Nurve Networks

Specifications of Chameleon-PIC

• Processor To Be Evaluated: PIC24
• Data Bus Width: 16 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

Function Prototype:
Description:
Example(s): Set the tilemap width to 128 tiles which is 4 complete screen fills of tiles for horizontal scrolling.
GFX_Set_Tilemap_Width( 2 );
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Function Prototype:
Description:
Example(s):
int bottom_overscan_color = GFX_Get_Bottom_Overscan_color();
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Function Prototype:
Description:
Example(s):
int top_overscan_color = GFX_Get_Top_Overscan_color();
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Function Prototype:
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.
GFX_Set_Tilemap_Width(…) sets the width of the tile map to 32, 64, 128 or 256 which are
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.
GFX_Get_Bottom_Overscan_Color() retrieves the bottom overscan color of the NTSC driver. The
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].
GFX_Get_Top_Overscan_Color() retrieves the top overscan color of the NTSC driver. The
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].
© 2009 NURVE NETWORKS LLC “Exploring the Chameleon PIC 16-Bit”
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