113 lines
5.3 KiB
C
113 lines
5.3 KiB
C
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// ****************************************************************************
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//
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// VGA configuration
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//
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// ****************************************************************************
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// === Configuration
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#define LAYERS 4 // total layers 1..4 (1 base layer + 3 overlapped layers)
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#define SEGMAX 8 // max. number of video segment per video strip (size of 1 sSegm = 28 bytes)
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#define STRIPMAX 8 // max. number of video strips (size of 1 sStrip = sSegm size*SEGMAX+4 = 228 bytes)
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// size of sScreen = sStrip size*STRIPMAX+4 = 1828 bytes
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#define MAXX 640 // max. resolution in X direction (must be power of 4)
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#define MAXY 480 // max. resolution in Y direction
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#define MAXLINE 700 // max. number of scanlines (including sync and dark lines)
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// === Scanline render buffers (800 pixels: default size of buffers = 2*4*(800+8+800+24)+800 = 13856 bytes
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// Requirements by format, base layer 0, 1 wrap X segment:
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// GF_GRAPH8 ... control buffer 16 bytes
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// GF_TILE8 ... control buffer "width"+8 bytes
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// GF_TILE16 ... control buffer "width/2"+8 bytes
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// GF_TILE32 ... control buffer "width/4"+8 bytes
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// GF_TILE64 ... control buffer "width/8"+8 bytes
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// GF_PROGRESS ... control buffer 24 bytes
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// other formats: data buffer "width" bytes, control buffer 16 bytes
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#define DBUF0_MAX (MAXX+8) // max. size of data buffer of layer 0
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#define CBUF0_MAX ((MAXX+24)/4) // max. size of control buffer of layer 0
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// Requirements by format, overlapped layer 1..3:
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// LAYERMODE_SPRITE* ... data buffer "width"+4 bytes, control buffer 24 bytes
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// LAYERMODE_FASTSPRITE* ... data buffer "width"+4 bytes, control buffer up to "width*2"+16 bytes
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// other formats ... data buffer 4 bytes, control buffer 24 bytes
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#define DBUF1_MAX (MAXX+8) // max. size of data buffer of layer 1
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#define CBUF1_MAX ((MAXX+24)/4) // max. size of control buffer of layer 1
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#define DBUF2_MAX (MAXX+8) // max. size of data buffer of layer 2
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#define CBUF2_MAX ((MAXX+24)/4) // max. size of control buffer of layer 2
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#define DBUF3_MAX (MAXX+8) // max. size of data buffer of layer 3
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#define CBUF3_MAX ((MAXX+24)/4) // max. size of control buffer of layer 3
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#if LAYERS==1
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#define DBUF_MAX DBUF0_MAX // max. size of data buffer
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#define CBUF_MAX CBUF0_MAX // max. size of control buffer
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#elif LAYERS==2
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#define DBUF_MAX (DBUF0_MAX+DBUF1_MAX) // max. size of data buffer
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#define CBUF_MAX (CBUF0_MAX+CBUF1_MAX) // max. size of control buffer
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#elif LAYERS==3
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#define DBUF_MAX (DBUF0_MAX+DBUF1_MAX+DBUF2_MAX) // max. size of data buffer
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#define CBUF_MAX (CBUF0_MAX+CBUF1_MAX+CBUF2_MAX) // max. size of control buffer
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#elif LAYERS==4
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#define DBUF_MAX (DBUF0_MAX+DBUF1_MAX+DBUF2_MAX+DBUF3_MAX) // max. size of data buffer
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#define CBUF_MAX (CBUF0_MAX+CBUF1_MAX+CBUF2_MAX+CBUF3_MAX) // max. size of control buffer
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#else
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#error Unsupported number of layers!
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#endif
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// === VGA port pins
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// GP0 ... VGA B0 blue
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// GP1 ... VGA B1
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// GP2 ... VGA G0 green
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// GP3 ... VGA G1
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// GP4 ... VGA G2
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// GP5 ... VGA R0 red
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// GP6 ... VGA R1
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// GP7 ... VGA R2
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// GP8 ... VGA SYNC synchronization (inverted: negative SYNC=LOW=0x80, BLACK=HIGH=0x00)
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#define VGA_GPIO_FIRST 0 // first VGA GPIO
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#define VGA_GPIO_NUM 9 // number of VGA GPIOs, including HSYNC and VSYNC
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#define VGA_GPIO_OUTNUM 8 // number of VGA color GPIOs, without HSYNC and VSYNC
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#define VGA_GPIO_LAST (VGA_GPIO_FIRST+VGA_GPIO_NUM-1) // last VGA GPIO
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#define VGA_GPIO_SYNC 8 // VGA SYNC GPIO
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// VGA PIO and state machines
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#define VGA_PIO pio0 // VGA PIO
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#define VGA_SM0 0 // VGA state machine of base layer 0
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#define VGA_SM1 1 // VGA state machine of overlapped layer 1
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#define VGA_SM2 2 // VGA state machine of overlapped layer 2
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#define VGA_SM3 3 // VGA state machine of overlapped layer 3
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#define VGA_SM(layer) (VGA_SM0+(layer)) // VGA state machine of the layer
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#if LAYERS==1
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#define VGA_SMALL B0 // mask of all state machines
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#elif LAYERS==2
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#define VGA_SMALL (B0+B1) // mask of all state machines
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#elif LAYERS==3
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#define VGA_SMALL (B0+B1+B2) // mask of all state machines
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#elif LAYERS==4
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#define VGA_SMALL (B0+B1+B2+B3) // mask of all state machines
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#else
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#error Unsupported number of layers!
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#endif
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// VGA DMA
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#define VGA_DMA 0 // VGA DMA base channel
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#define VGA_DMA_CB0 (VGA_DMA+0) // VGA DMA channel - control block of base layer
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#define VGA_DMA_PIO0 (VGA_DMA+1) // VGA DMA channel - copy data of base layer to PIO (raises IRQ0 on quiet)
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#define VGA_DMA_CB1 (VGA_DMA+2) // VGA DMA channel - control block of overlapped layer 1
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#define VGA_DMA_PIO1 (VGA_DMA+3) // VGA DMA channel - copy data of overlapped layer 1 to PIO
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#define VGA_DMA_CB2 (VGA_DMA+4) // VGA DMA channel - control block of overlapped layer 1
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#define VGA_DMA_PIO2 (VGA_DMA+5) // VGA DMA channel - copy data of overlapped layer 2 to PIO
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#define VGA_DMA_CB3 (VGA_DMA+6) // VGA DMA channel - control block of overlapped layer 1
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#define VGA_DMA_PIO3 (VGA_DMA+7) // VGA DMA channel - copy data of overlapped layer 3 to PIO
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#define VGA_DMA_CB(layer) (VGA_DMA_CB0+(layer)*2) // VGA DMA control channel of the layer
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#define VGA_DMA_PIO(layer) (VGA_DMA_PIO0+(layer)*2) // VGA DMA data channel of the layer
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#define VGA_DMA_NUM (LAYERS*2) // number of used DMA channels
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#define VGA_DMA_FIRST VGA_DMA // first used DMA
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#define VGA_DMA_LAST (VGA_DMA_FIRST+VGA_DMA_NUM-1) // last used DMA
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