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Implement OAK OTi-0x7 clock select.

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This commit is contained in:
OBattler
2022-08-02 02:30:41 +02:00
parent e7ca9f3b5f
commit f5be05a19c
1 changed files with 43 additions and 11 deletions
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36
src/video/vid_oak_oti.c
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@@ -342,11 +342,42 @@ oti_pos_in(uint16_t addr, void *p)
}
static float
oti_getclock(int clock)
{
float ret = 0.0;
switch (clock) {
case 0:
default:
ret = 25175000.0;
break;
case 1:
ret = 28322000.0;
break;
case 4:
ret = 14318000.0;
break;
case 5:
ret = 16257000.0;
break;
case 7:
ret = 35500000.0;
break;
}
}
static void
oti_recalctimings(svga_t *svga)
{
oti_t *oti = (oti_t *)svga->p;
int clk_sel = ((svga->miscout >> 2) & 3) | ((oti->regs[0x0d] & 0x20) >> 3);
svga->clock = (cpuclock * (double)(1ull << 32)) / oti_getclock(clk_sel);
if (oti->chip_id > 0) {
if (oti->regs[0x14] & 0x08) svga->ma_latch |= 0x10000;
if (oti->regs[0x16] & 0x08) svga->ma_latch |= 0x20000;
@@ -354,9 +385,10 @@ oti_recalctimings(svga_t *svga)
if (oti->regs[0x14] & 0x02) svga->dispend += 0x400;
if (oti->regs[0x14] & 0x04) svga->vsyncstart += 0x400;
if ((oti->regs[0x0d] & 0x0c) && !(oti->regs[0x0d] & 0x10)) svga->rowoffset <<= 1;
svga->interlace = oti->regs[0x14] & 0x80;
}
if ((oti->regs[0x0d] & 0x0c) && !(oti->regs[0x0d] & 0x10)) svga->rowoffset <<= 1;
if (svga->bpp == 16) {
svga->render = svga_render_16bpp_highres;