+/*
+ * 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_ptr;
int pwm_frame_smp_cnt;
+static int timer_line_ticks[2];
-void p32x_pwm_refresh(void)
+// 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;
if (cycles < 500) {
- elprintf(EL_32X|EL_ANOMALY, "pwm: low cycle value: %d", cycles + 1);
+ elprintf(EL_32X|EL_PWM|EL_ANOMALY, "pwm: low cycle value: %d", cycles + 1);
cycles = 500;
}
pwm_cycles = cycles;
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++) {
+ tmp = PREG8(Pico32xMem->sh2_peri_regs[i], 0x80) & 7;
+ // Sclk cycles per timer tick
+ if (tmp)
+ 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);
+ }
}
-// irq for every sample??
-// FIXME: we need to hit more than once per line :(
-void p32x_pwm_irq_check(void)
+// PWM irq for every tm samples
+void p32x_timers_do(int line_call)
{
- int tm = (Pico32x.regs[0x30 / 2] & 0x0f00) >> 8;
- if (tm == 0)
- return; // TODO: verify
-
- 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();
+ int tm, 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);
+ }
+ }
+ }
+
+ if (!line_call)
+ return;
+
+ for (i = 0; i < 2; i++) {
+ void *pregs = Pico32xMem->sh2_peri_regs[i];
+ if (PREG8(pregs, 0x80) & 0x20) { // TME
+ cnt = PREG8(pregs, 0x81);
+ cnt += timer_line_ticks[i];
+ 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;
+ }
}
}
case 6: // R ch
case 8: // MONO
predict = (pwm_line_samples * Pico.m.scanline) >> 16;
- elprintf(EL_32X, "pwm: read status: ptr %d/%d, predict %d",
+ 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)
d |= P32XP_FULL;
Pico32x.regs[0x30 / 2] = d;
else if (a == 2) { // cycle
Pico32x.regs[0x32 / 2] = d & 0x0fff;
- p32x_pwm_refresh();
+ p32x_timers_recalc();
Pico32x.pwm_irq_sample_cnt = 0; // resets?
}
else if (a <= 8) {
if (a >= 6) { // R or MONO
pwm_frame_smp_cnt++;
pwm_ptr = (pwm_ptr + 1) & (PWM_BUFF_LEN - 1);
- elprintf(EL_32X, "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_frame_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;
}
}
- elprintf(EL_STATUS, "pwm_update: pwm_ptr %d, len %d, step %04x, done %d",
+ elprintf(EL_PWM, "pwm_update: pwm_ptr %d, len %d, step %04x, done %d",
pwm_ptr, length, step, (pwmb - Pico32xMem->pwm) / 2);
pwm_ptr = 0;