+/*
+ * PicoDrive
+ * (C) notaz, 2009,2010
+ *
+ * This work is licensed under the terms of MAME license.
+ * See COPYING file in the top-level directory.
+ */
#include "../pico_int.h"
-static int pwm_line_samples;
+static int pwm_cycle_counter;
static int pwm_cycles;
static int pwm_mult;
static int pwm_ptr;
-int pwm_frame_smp_cnt;
-static int timer_line_ticks[2];
+static int pwm_smp_cnt;
+static int pwm_smp_expect;
+
+static int timer_cycles[2];
+static int timer_tick_cycles[2];
// timers. This includes PWM timer in 32x and internal SH2 timers
void p32x_timers_recalc(void)
{
int cycles = Pico32x.regs[0x32 / 2];
- int frame_samples;
int tmp, i;
cycles = (cycles - 1) & 0x0fff;
}
pwm_cycles = cycles;
pwm_mult = 0x10000 / cycles;
- if (Pico.m.pal)
- frame_samples = OSC_PAL / 7 * 3 / 50 / cycles;
- else
- frame_samples = OSC_NTSC / 7 * 3 / 60 / cycles;
-
- pwm_line_samples = (frame_samples << 16) / scanlines_total;
// SH2 timer step
for (i = 0; i < 2; i++) {
cycles = 0x20 << tmp;
else
cycles = 2;
- if (Pico.m.pal)
- tmp = OSC_PAL / 7 * 3 / 50 / scanlines_total;
- else
- tmp = OSC_NTSC / 7 * 3 / 60 / scanlines_total;
- timer_line_ticks[i] = (tmp << 16) / cycles;
- elprintf(EL_32X, "timer_line_ticks[%d] = %.3f", i, (double)timer_line_ticks[i] / 0x10000);
+ timer_tick_cycles[i] = cycles;
+ elprintf(EL_32X, "WDT cycles[%d] = %d", i, cycles);
}
}
// PWM irq for every tm samples
-void p32x_timers_do(int line_call)
+void p32x_timers_do(unsigned int cycles)
{
- int tm, cnt, i;
+ int cnt, i;
- if (PicoOpt & POPT_EN_PWM)
- {
- tm = (Pico32x.regs[0x30 / 2] & 0x0f00) >> 8;
- if (tm != 0) {
- if (line_call)
- Pico32x.pwm_irq_sample_cnt += pwm_line_samples;
- if (Pico32x.pwm_irq_sample_cnt >= (tm << 16)) {
- Pico32x.pwm_irq_sample_cnt -= tm << 16;
- Pico32x.sh2irqs |= P32XI_PWM;
- p32x_update_irls(!line_call);
- }
- }
- }
+ cycles *= 3;
- if (!line_call)
- return;
+ pwm_cycle_counter += cycles;
+ while (pwm_cycle_counter > pwm_cycles) {
+ pwm_cycle_counter -= pwm_cycles;
+ pwm_smp_expect++;
+ }
+ // WDT timers
for (i = 0; i < 2; i++) {
void *pregs = Pico32xMem->sh2_peri_regs[i];
if (PREG8(pregs, 0x80) & 0x20) { // TME
+ timer_cycles[i] += cycles;
cnt = PREG8(pregs, 0x81);
- cnt += timer_line_ticks[i];
+ while (timer_cycles[i] >= timer_tick_cycles[i]) {
+ timer_cycles[i] -= timer_tick_cycles[i];
+ cnt++;
+ }
if (cnt >= 0x100) {
int level = PREG8(pregs, 0xe3) >> 4;
int vector = PREG8(pregs, 0xe4) & 0x7f;
- elprintf(EL_32X, "%csh2 WDT irq (%d, %d)", i ? 's' : 'm', level, vector);
+ elprintf(EL_32X, "%csh2 WDT irq (%d, %d)",
+ i ? 's' : 'm', level, vector);
sh2_internal_irq(&sh2s[i], level, vector);
+ cnt &= 0xff;
}
- cnt &= 0xff;
PREG8(pregs, 0x81) = cnt;
}
}
}
+void p32x_pwm_schedule(unsigned int now)
+{
+ int tm;
+
+ if (Pico32x.emu_flags & P32XF_PWM_PEND)
+ return; // already scheduled
+ if (Pico32x.sh2irqs & P32XI_PWM)
+ return; // previous not acked
+ if (!((Pico32x.sh2irq_mask[0] | Pico32x.sh2irq_mask[1]) & 1))
+ return; // masked by everyone
+
+ tm = (Pico32x.regs[0x30 / 2] & 0x0f00) >> 8;
+ tm = ((tm - 1) & 0x0f) + 1;
+ p32x_event_schedule(P32X_EVENT_PWM, now, pwm_cycles * tm / 3);
+ Pico32x.emu_flags |= P32XF_PWM_PEND;
+}
+
unsigned int p32x_pwm_read16(unsigned int a)
{
unsigned int d = 0;
- int predict;
+ int diff;
a &= 0x0e;
switch (a) {
case 4: // L ch
case 6: // R ch
case 8: // MONO
- predict = (pwm_line_samples * Pico.m.scanline) >> 16;
- elprintf(EL_PWM, "pwm: read status: ptr %d/%d, predict %d",
- pwm_frame_smp_cnt, (pwm_line_samples * scanlines_total) >> 16, predict);
- if (pwm_frame_smp_cnt > predict + 3)
+ diff = pwm_smp_cnt - pwm_smp_expect;
+ elprintf(EL_PWM, "pwm: read status: ptr %d/%d %d",
+ pwm_smp_cnt, pwm_smp_expect, diff);
+ if (diff > 3)
d |= P32XP_FULL;
- else if (pwm_frame_smp_cnt == 0 || pwm_frame_smp_cnt < predict - 1)
+ else if (diff < 0)
d |= P32XP_EMPTY;
break;
}
Pico32xMem->pwm[pwm_ptr * 2] = Pico32xMem->pwm[pwm_ptr * 2 + 1] = d;
if (a >= 6) { // R or MONO
- pwm_frame_smp_cnt++;
+ pwm_smp_cnt++;
pwm_ptr = (pwm_ptr + 1) & (PWM_BUFF_LEN - 1);
- elprintf(EL_PWM, "pwm: smp_cnt %d, ptr %d, smp %x", pwm_frame_smp_cnt, pwm_ptr, d);
+ elprintf(EL_PWM, "pwm: smp_cnt %d, ptr %d, smp %x",
+ pwm_smp_cnt, pwm_ptr, d);
}
}
}
void p32x_pwm_update(int *buf32, int length, int stereo)
{
- extern int pwm_ptr;
short *pwmb;
int step;
int p = 0;
pwm_ptr = 0;
}
+// vim:shiftwidth=2:ts=2:expandtab