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Add VSYNC support and picovga.cmake file

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Wayne Venables
2023-02-25 15:30:08 -08:00
parent 04457da9fb
commit 73a91f3508
3 changed files with 104 additions and 76 deletions
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27
src/vga.cpp
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@@ -83,6 +83,12 @@ int __not_in_flash_func(VgaBufProcess)()
int y0 = -1;
u8 linetype = ScanlineType[line];
// Added VSYNC support (Added by WV)
#ifdef VGA_GPIO_VSYNC
gpio_put(VGA_GPIO_VSYNC, linetype != LINE_VSYNC);
#endif
switch (linetype)
{
case LINE_IMG: // progressive image 0, 1, 2,...
@@ -712,10 +718,17 @@ void VgaBufInit()
// VGA mode
else
{
// vertical synchronization
// hsync must be min. 4
LineBufSync[0] = BYTESWAP(VGACMD(vga_offset_sync+BASE_OFFSET,CurVmode.htot-CurVmode.hsync-3)); // invert dark line
LineBufSync[1] = BYTESWAP(VGADARK(CurVmode.hsync-4,0)); // invert HSYNC
// Add VSYNC support. If VSYNC provided, don't HSYNC on VSYNC (Added by WV)
#ifndef VGA_GPIO_VSYNC
// vertical synchronization
// hsync must be min. 4
LineBufSync[0] = BYTESWAP(VGACMD(vga_offset_sync+BASE_OFFSET,CurVmode.htot-CurVmode.hsync-3)); // invert dark line
LineBufSync[1] = BYTESWAP(VGADARK(CurVmode.hsync-4,0)); // invert HSYNC
#else
// no-vertical synchronization (Added by WV)
LineBufSync[0] = BYTESWAP(VGACMD(vga_offset_sync+BASE_OFFSET,CurVmode.hsync-3)); // HSYNC
LineBufSync[1] = BYTESWAP(VGADARK(CurVmode.htot-CurVmode.hsync-4,0)); // dark line
#endif
// control blocks - initialize to VSYNC
CtrlBuf1[0] = 2; // send 2x u32
@@ -975,6 +988,12 @@ void VgaInit(const sVmode* vmode)
LayerProgInx = vmode->prog;
memcpy(&CurLayerProg, &LayerProg[LayerProgInx], sizeof(sLayerProg));
// set vsync output if necessary (Added by WV)
#ifdef VGA_GPIO_VSYNC
gpio_init(VGA_GPIO_VSYNC);
gpio_set_dir(VGA_GPIO_VSYNC, true);
#endif
// initialize VGA PIO
VgaPioInit();