static int pwm_cycles;
static int pwm_mult;
static int pwm_ptr;
+static int pwm_irq_reload;
+static int pwm_doing_fifo;
+static int pwm_silent;
-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)
+void p32x_pwm_ctl_changed(void)
{
+ int control = Pico32x.regs[0x30 / 2];
int cycles = Pico32x.regs[0x32 / 2];
- int tmp, i;
cycles = (cycles - 1) & 0x0fff;
pwm_cycles = cycles;
- pwm_mult = 0x10000 / cycles;
-
- // SH2 timer step
- for (i = 0; i < 2; i++) {
- tmp = PREG8(Pico32xMem->sh2_peri_regs[i], 0x80) & 7;
- // Sclk cycles per timer tick
- if (tmp)
- cycles = 0x20 << tmp;
- else
- cycles = 2;
- timer_tick_cycles[i] = cycles;
- elprintf(EL_32X, "WDT cycles[%d] = %d", i, cycles);
+
+ // supposedly we should stop FIFO when xMd is 0,
+ // but mars test disagrees
+ pwm_mult = 0;
+ if ((control & 0x0f) != 0)
+ pwm_mult = 0x10000 / cycles;
+
+ pwm_irq_reload = (control & 0x0f00) >> 8;
+ pwm_irq_reload = ((pwm_irq_reload - 1) & 0x0f) + 1;
+
+ if (Pico32x.pwm_irq_cnt == 0)
+ Pico32x.pwm_irq_cnt = pwm_irq_reload;
+}
+
+static void do_pwm_irq(SH2 *sh2, unsigned int m68k_cycles)
+{
+ p32x_trigger_irq(sh2, m68k_cycles, P32XI_PWM);
+
+ if (Pico32x.regs[0x30 / 2] & P32XP_RTP) {
+ p32x_event_schedule(m68k_cycles, P32X_EVENT_PWM, pwm_cycles / 3 + 1);
+ // note: might recurse
+ p32x_dreq1_trigger();
}
}
-#define consume_fifo(cycles) { \
- int cycles_diff = (cycles) - Pico32x.pwm_cycle_p; \
+static int convert_sample(unsigned int v)
+{
+ if (v == 0)
+ return 0;
+ if (v > pwm_cycles)
+ v = pwm_cycles;
+ return ((int)v - pwm_cycles / 2) * pwm_mult;
+}
+
+#define consume_fifo(sh2, m68k_cycles) { \
+ int cycles_diff = ((m68k_cycles) * 3) - Pico32x.pwm_cycle_p; \
if (cycles_diff >= pwm_cycles) \
- consume_fifo_do((cycles), cycles_diff); \
+ consume_fifo_do(sh2, m68k_cycles, cycles_diff); \
}
-static void consume_fifo_do(unsigned int cycles, int cycles_diff)
+static void consume_fifo_do(SH2 *sh2, unsigned int m68k_cycles,
+ int sh2_cycles_diff)
{
- if (pwm_cycles == 0)
+ struct Pico32xMem *mem = Pico32xMem;
+ unsigned short *fifo_l = mem->pwm_fifo[0];
+ unsigned short *fifo_r = mem->pwm_fifo[1];
+ int sum = 0;
+
+ if (pwm_cycles == 0 || pwm_doing_fifo)
return;
elprintf(EL_PWM, "pwm: %u: consume %d/%d, %d,%d ptr %d",
- cycles, cycles_diff, cycles_diff / pwm_cycles,
+ m68k_cycles, sh2_cycles_diff, sh2_cycles_diff / pwm_cycles,
Pico32x.pwm_p[0], Pico32x.pwm_p[1], pwm_ptr);
- if (cycles_diff > pwm_cycles * 9) {
- // silence/skip
- Pico32x.pwm_cycle_p = cycles;
- Pico32x.pwm_p[0] = Pico32x.pwm_p[1] = 0;
- return;
- }
-
- for (; cycles_diff >= pwm_cycles; cycles_diff -= pwm_cycles) {
- struct Pico32xMem *mem = Pico32xMem;
- short *fifo_l = mem->pwm_fifo[0];
- short *fifo_r = mem->pwm_fifo[1];
+ // this is for recursion from dreq1 writes
+ pwm_doing_fifo = 1;
+ for (; sh2_cycles_diff >= pwm_cycles; sh2_cycles_diff -= pwm_cycles)
+ {
if (Pico32x.pwm_p[0] > 0) {
fifo_l[0] = fifo_l[1];
fifo_l[1] = fifo_l[2];
fifo_l[2] = fifo_l[3];
Pico32x.pwm_p[0]--;
+ mem->pwm_current[0] = convert_sample(fifo_l[0]);
+ sum += mem->pwm_current[0];
}
if (Pico32x.pwm_p[1] > 0) {
fifo_r[0] = fifo_r[1];
fifo_r[1] = fifo_r[2];
fifo_r[2] = fifo_r[3];
Pico32x.pwm_p[1]--;
+ mem->pwm_current[1] = convert_sample(fifo_r[0]);
+ sum += mem->pwm_current[1];
}
- mem->pwm[pwm_ptr * 2 ] = fifo_l[0];
- mem->pwm[pwm_ptr * 2 + 1] = fifo_r[0];
+ mem->pwm[pwm_ptr * 2 ] = mem->pwm_current[0];
+ mem->pwm[pwm_ptr * 2 + 1] = mem->pwm_current[1];
pwm_ptr = (pwm_ptr + 1) & (PWM_BUFF_LEN - 1);
- }
- Pico32x.pwm_cycle_p = cycles - cycles_diff;
-}
-void p32x_timers_do(unsigned int m68k_now, unsigned int m68k_slice)
-{
- unsigned int cycles = m68k_slice * 3;
- int cnt, i;
-
- consume_fifo(m68k_now * 3);
-
- // 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);
- 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);
- sh2_internal_irq(&sh2s[i], level, vector);
- cnt &= 0xff;
- }
- PREG8(pregs, 0x81) = cnt;
+ if (--Pico32x.pwm_irq_cnt == 0) {
+ Pico32x.pwm_irq_cnt = pwm_irq_reload;
+ do_pwm_irq(sh2, m68k_cycles);
}
}
+ Pico32x.pwm_cycle_p = m68k_cycles * 3 - sh2_cycles_diff;
+ pwm_doing_fifo = 0;
+ if (sum != 0)
+ pwm_silent = 0;
}
-static int p32x_pwm_schedule_(void)
+static int p32x_pwm_schedule_(SH2 *sh2, unsigned int m68k_now)
{
- int tm;
+ unsigned int sh2_now = m68k_now * 3;
+ int cycles_diff_sh2;
+
+ if (pwm_cycles == 0)
+ return 0;
+
+ cycles_diff_sh2 = sh2_now - Pico32x.pwm_cycle_p;
+ if (cycles_diff_sh2 >= pwm_cycles)
+ consume_fifo_do(sh2, m68k_now, cycles_diff_sh2);
- if (Pico32x.emu_flags & P32XF_PWM_PEND)
- return 0; // already scheduled
- if (Pico32x.sh2irqs & P32XI_PWM)
- return 0; // previous not acked
if (!((Pico32x.sh2irq_mask[0] | Pico32x.sh2irq_mask[1]) & 1))
return 0; // masked by everyone
- Pico32x.emu_flags |= P32XF_PWM_PEND;
- tm = (Pico32x.regs[0x30 / 2] & 0x0f00) >> 8;
- tm = ((tm - 1) & 0x0f) + 1;
- return pwm_cycles * tm / 3;
+ cycles_diff_sh2 = sh2_now - Pico32x.pwm_cycle_p;
+ return (Pico32x.pwm_irq_cnt * pwm_cycles
+ - cycles_diff_sh2) / 3 + 1;
}
-void p32x_pwm_schedule(unsigned int now)
+void p32x_pwm_schedule(unsigned int m68k_now)
{
- int after = p32x_pwm_schedule_();
+ int after = p32x_pwm_schedule_(NULL, m68k_now);
if (after != 0)
- p32x_event_schedule(now, P32X_EVENT_PWM, after);
+ p32x_event_schedule(m68k_now, P32X_EVENT_PWM, after);
}
void p32x_pwm_schedule_sh2(SH2 *sh2)
{
- int after = p32x_pwm_schedule_();
+ int after = p32x_pwm_schedule_(sh2, sh2_cycles_done_m68k(sh2));
if (after != 0)
p32x_event_schedule_sh2(sh2, P32X_EVENT_PWM, after);
}
-unsigned int p32x_pwm_read16(unsigned int a, unsigned int cycles)
+void p32x_pwm_sync_to_sh2(SH2 *sh2)
+{
+ int m68k_cycles = sh2_cycles_done_m68k(sh2);
+ consume_fifo(sh2, m68k_cycles);
+}
+
+void p32x_pwm_irq_event(unsigned int m68k_now)
+{
+ p32x_pwm_schedule(m68k_now);
+}
+
+unsigned int p32x_pwm_read16(unsigned int a, SH2 *sh2,
+ unsigned int m68k_cycles)
{
unsigned int d = 0;
- consume_fifo(cycles);
+ consume_fifo(sh2, m68k_cycles);
a &= 0x0e;
switch (a) {
break;
}
- elprintf(EL_PWM, "pwm: read %02x %04x (p %d %d), c %u",
- a, d, Pico32x.pwm_p[0], Pico32x.pwm_p[1], cycles);
+ elprintf(EL_PWM, "pwm: %u: r16 %02x %04x (p %d %d)",
+ m68k_cycles, a, d, Pico32x.pwm_p[0], Pico32x.pwm_p[1]);
return d;
}
-void p32x_pwm_write16(unsigned int a, unsigned int d, unsigned int cycles)
+void p32x_pwm_write16(unsigned int a, unsigned int d,
+ SH2 *sh2, unsigned int m68k_cycles)
{
- consume_fifo(cycles);
+ elprintf(EL_PWM, "pwm: %u: w16 %02x %04x (p %d %d)",
+ m68k_cycles, a & 0x0e, d, Pico32x.pwm_p[0], Pico32x.pwm_p[1]);
+
+ consume_fifo(sh2, m68k_cycles);
a &= 0x0e;
if (a == 0) { // control
- // supposedly we should stop FIFO when xMd is 0,
- // but mars test disagrees
+ // avoiding pops..
+ if ((Pico32x.regs[0x30 / 2] & 0x0f) == 0)
+ Pico32xMem->pwm_fifo[0][0] = Pico32xMem->pwm_fifo[1][0] = 0;
Pico32x.regs[0x30 / 2] = d;
+ p32x_pwm_ctl_changed();
+ Pico32x.pwm_irq_cnt = pwm_irq_reload; // ?
}
else if (a == 2) { // cycle
Pico32x.regs[0x32 / 2] = d & 0x0fff;
- p32x_timers_recalc();
- Pico32x.pwm_irq_sample_cnt = 0; // resets?
+ p32x_pwm_ctl_changed();
}
else if (a <= 8) {
d = (d - 1) & 0x0fff;
- if (d > pwm_cycles)
- d = pwm_cycles;
- d = (d - pwm_cycles / 2) * pwm_mult;
if (a == 4 || a == 8) { // L ch or MONO
- short *fifo = Pico32xMem->pwm_fifo[0];
+ unsigned short *fifo = Pico32xMem->pwm_fifo[0];
if (Pico32x.pwm_p[0] < 3)
Pico32x.pwm_p[0]++;
else {
fifo[Pico32x.pwm_p[0]] = d;
}
if (a == 6 || a == 8) { // R ch or MONO
- short *fifo = Pico32xMem->pwm_fifo[1];
+ unsigned short *fifo = Pico32xMem->pwm_fifo[1];
if (Pico32x.pwm_p[1] < 3)
Pico32x.pwm_p[1]++;
else {
int p = 0;
int xmd;
+ consume_fifo(NULL, SekCyclesDone());
+
xmd = Pico32x.regs[0x30 / 2] & 0x0f;
- if ((xmd != 0x05 && xmd != 0x0a) || pwm_ptr <= 16)
- goto out;
+ if (xmd == 0 || xmd == 0x06 || xmd == 0x09 || xmd == 0x0f)
+ goto out; // invalid?
+ if (pwm_silent)
+ return;
- step = (pwm_ptr << 16) / length; // FIXME: division..
+ step = (pwm_ptr << 16) / length;
pwmb = Pico32xMem->pwm;
if (stereo)
{
- if (xmd == 0x0a) {
+ if (xmd == 0x05) {
+ // normal
+ while (length-- > 0) {
+ *buf32++ += pwmb[0];
+ *buf32++ += pwmb[1];
+
+ p += step;
+ pwmb += (p >> 16) * 2;
+ p &= 0xffff;
+ }
+ }
+ else if (xmd == 0x0a) {
// channel swap
while (length-- > 0) {
*buf32++ += pwmb[1];
}
}
else {
+ // mono - LMD, RMD specify dst
+ if (xmd & 0x06) // src is R
+ pwmb++;
+ if (xmd & 0x0c) // dst is R
+ buf32++;
while (length-- > 0) {
- *buf32++ += pwmb[0];
- *buf32++ += pwmb[1];
+ *buf32 += *pwmb;
p += step;
pwmb += (p >> 16) * 2;
p &= 0xffff;
+ buf32 += 2;
}
}
}
else
{
+ // mostly unused
while (length-- > 0) {
*buf32++ += pwmb[0];
out:
pwm_ptr = 0;
+ pwm_silent = Pico32xMem->pwm_current[0] == 0
+ && Pico32xMem->pwm_current[1] == 0;
+}
+
+void p32x_pwm_state_loaded(void)
+{
+ int cycles_diff_sh2;
+
+ p32x_pwm_ctl_changed();
+
+ // for old savestates
+ cycles_diff_sh2 = Pico.t.m68c_cnt * 3 - Pico32x.pwm_cycle_p;
+ if (cycles_diff_sh2 >= pwm_cycles || cycles_diff_sh2 < 0) {
+ Pico32x.pwm_irq_cnt = pwm_irq_reload;
+ Pico32x.pwm_cycle_p = Pico.t.m68c_cnt * 3;
+ p32x_pwm_schedule(Pico.t.m68c_cnt);
+ }
}
// vim:shiftwidth=2:ts=2:expandtab
notaz.gp2x.de / picodrive.git / blobdiff