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32x, improve pwm volume accuracy

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kub 2023-07-11 21:43:00 +00:00
parent 7263343dc7
commit adffea8dae
1 changed files with 2 additions and 4 deletions
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6
pico/32x/pwm.c
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@ -34,7 +34,7 @@ void p32x_pwm_ctl_changed(void)
// but mars test disagrees
pwm.mult = 0;
if ((control & 0x0f) != 0)
pwm.mult = 0x10000 / cycles;
pwm.mult = (0x10000<<8) / (cycles+1);
pwm.irq_timer = (control & 0x0f00) >> 8;
pwm.irq_timer = ((pwm.irq_timer - 1) & 0x0f) + 1;
@ -60,9 +60,7 @@ static int convert_sample(unsigned int v)
{
if (v > pwm.cycles)
v = pwm.cycles;
if (v == 0)
return 0;
return v * pwm.mult - 0x10000/2;
return (v * pwm.mult >> 8) - 0x10000/2;
}
#define consume_fifo(sh2, m68k_cycles) { \