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some Pico adjustments

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@447 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2008-05-18 15:56:52 +00:00
parent 213c16adcb
commit fa22af4caf
5 changed files with 55 additions and 32 deletions
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28
Pico/Pico/Pico.c
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@ -8,9 +8,13 @@ picohw_state PicoPicohw;
static int prev_line_cnt_irq3 = 0, prev_line_cnt_irq5 = 0;
static int fifo_bytes_line = (16000<<16)/60/262/2;
static const int guessed_rates[] = { 8000, 14000, 12000, 14000, 16000, 18000, 16000, 16000 }; // ?
#define PICOHW_FIFO_IRQ_THRESHOLD 12
PICO_INTERNAL void PicoReratePico(void)
{
int rate = (PicoPicohw.r12 & 0xf) ? 16000 : 8000;
int rate = guessed_rates[PicoPicohw.r12 & 7];
if (Pico.m.pal)
fifo_bytes_line = (rate<<16)/50/312/2;
else fifo_bytes_line = (rate<<16)/60/262/2;
@ -25,18 +29,10 @@ static void PicoLinePico(int count)
if ((PicoPicohw.r12 & 0x4003) && PicoPicohw.line_counter - prev_line_cnt_irq3 > 200) {
prev_line_cnt_irq3 = PicoPicohw.line_counter;
// just a guess/hack, allows 101 Dalmantians to boot
elprintf(EL_ANOMALY, "irq3");
elprintf(EL_PICOHW, "irq3");
SekInterrupt(3);
return;
}
if (PicoPicohw.fifo_bytes == 16) {
prev_line_cnt_irq3 = PicoPicohw.line_counter;
elprintf(EL_ANOMALY, "irq3, fb=%i", PicoPicohw.fifo_bytes);
SekInterrupt(3);
PicoPicohw.fifo_bytes--;
return;
}
#endif
if (PicoPicohw.fifo_bytes > 0)
@ -52,10 +48,20 @@ static void PicoLinePico(int count)
else
PicoPicohw.fifo_line_bytes = 0;
#if 1
if (PicoPicohw.fifo_bytes_prev >= PICOHW_FIFO_IRQ_THRESHOLD &&
PicoPicohw.fifo_bytes < PICOHW_FIFO_IRQ_THRESHOLD) {
prev_line_cnt_irq3 = PicoPicohw.line_counter; // ?
elprintf(EL_PICOHW, "irq3, fb=%i", PicoPicohw.fifo_bytes);
SekInterrupt(3);
}
PicoPicohw.fifo_bytes_prev = PicoPicohw.fifo_bytes;
#endif
#if 0
if (PicoPicohw.line_counter - prev_line_cnt_irq5 > 512) {
prev_line_cnt_irq5 = PicoPicohw.line_counter;
elprintf(EL_ANOMALY, "irq5");
elprintf(EL_PICOHW, "irq5");
SekInterrupt(5);
}
#endif