32x: preliminary PWM implementation. 32x opts in menu

git-svn-id: file:///home/notaz/opt/svn/PicoDrive@790 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2009-09-22 19:38:49 +00:00
parent 5e128c6d27
commit db1d3564e6
16 changed files with 256 additions and 46 deletions

View file

@ -135,12 +135,15 @@ static __inline void SekRunM68k(int cyc)
void PicoFrame32x(void)
{
pwm_frame_smp_cnt = 0;
Pico32x.vdp_regs[0x0a/2] &= ~P32XV_VBLK; // get out of vblank
if ((Pico32x.vdp_regs[0] & 3 ) != 0) // no forced blanking
Pico32x.vdp_regs[0x0a/2] &= ~P32XV_PEN; // no pal access
if ((Pico32x.vdp_regs[0] & P32XV_Mx) != 0) // no forced blanking
Pico32x.vdp_regs[0x0a/2] &= ~P32XV_PEN; // no palette access
p32x_poll_event(1);
PicoFrameStart();
PicoFrameHints();
}

View file

@ -123,7 +123,6 @@ static void dma_68k2sh2_do(void)
Pico32x.regs[6 / 2] &= ~P32XS_68S; // transfer complete
if (dmac0->tcr0 == 0)
dmac0->chcr0 |= 2; // DMA has ended normally
p32x_poll_undetect(&m68k_poll, 0);
}
// ------------------------------------------------------------------
@ -137,7 +136,7 @@ static u32 p32x_reg_read16(u32 a)
if ((a & 0x30) == 0x20)
return sh2_comm_faker(a);
#else
if (p32x_poll_detect(&m68k_poll, a, SekPc, 0)) {
if ((a & 0x30) == 0x20 && p32x_poll_detect(&m68k_poll, a, SekPc, 0)) {
SekEndRun(16);
}
#endif
@ -146,6 +145,8 @@ static u32 p32x_reg_read16(u32 a)
if (a == 0x24 || a == 0x26)
return sh2_comm_faker(a);
#endif
if ((a & 0x30) == 0x30)
return p32x_pwm_read16(a);
return Pico32x.regs[a / 2];
}
@ -196,9 +197,6 @@ static void p32x_reg_write16(u32 a, u32 d)
u16 *r = Pico32x.regs;
a &= 0x3e;
// for write loops with FIFO checks..
m68k_poll.cnt = 0;
switch (a) {
case 0x00: // adapter ctl
r[0] = (r[0] & 0x83) | (d & P32XS_FM);
@ -234,6 +232,11 @@ static void p32x_reg_write16(u32 a, u32 d)
SekEndRun(16);
return;
}
// PWM
else if ((a & 0x30) == 0x30) {
p32x_pwm_write16(a, d);
return;
}
p32x_reg_write8(a + 1, d);
}
@ -296,9 +299,19 @@ static u32 p32x_sh2reg_read16(u32 a, int cpuid)
return r[a / 2];
}
// DREQ src, dst; comm port
if ((a & 0x38) == 0x08 || (a & 0x30) == 0x20)
// DREQ src, dst
if ((a & 0x38) == 0x08)
return r[a / 2];
// comm port
if ((a & 0x30) == 0x20) {
if (p32x_poll_detect(&sh2_poll[cpuid], a, sh2_pc(cpuid), 0))
ash2_end_run(8);
return r[a / 2];
}
if ((a & 0x30) == 0x30) {
sh2_poll[cpuid].cnt = 0;
return p32x_pwm_read16(a);
}
return 0;
}
@ -316,12 +329,18 @@ static void p32x_sh2reg_write16(u32 a, u32 d, int cpuid)
{
a &= 0xfe;
// comm
if ((a & 0x30) == 0x20 && Pico32x.regs[a/2] != d) {
Pico32x.regs[a / 2] = d;
p32x_poll_undetect(&m68k_poll, 0);
p32x_poll_undetect(&sh2_poll[cpuid ^ 1], 0);
return;
}
// PWM
else if ((a & 0x30) == 0x30) {
p32x_pwm_write16(a, d);
return;
}
switch (a) {
case 0x14: Pico32x.sh2irqs &= ~P32XI_VRES; goto irls;
@ -561,7 +580,6 @@ static void bank_switch(int b)
u32 p32x_sh2_read8(u32 a, int id)
{
int pd_vdp = 0;
u32 d = 0;
if (id == 0 && a < sizeof(Pico32xMem->sh2_rom_m))
@ -581,13 +599,14 @@ u32 p32x_sh2_read8(u32 a, int id)
if ((a & 0x0fffff00) == 0x4000) {
d = p32x_sh2reg_read16(a, id);
goto out_pd;
goto out_16to8;
}
if ((a & 0x0fffff00) == 0x4100) {
d = p32x_vdp_read16(a);
pd_vdp = 1;
goto out_pd;
if (p32x_poll_detect(&sh2_poll[id], a, sh2_pc(id), 1))
ash2_end_run(8);
goto out_16to8;
}
if ((a & 0x0fffff00) == 0x4200) {
@ -599,10 +618,6 @@ u32 p32x_sh2_read8(u32 a, int id)
id ? 's' : 'm', a, d, sh2_pc(id));
return d;
out_pd:
if (p32x_poll_detect(&sh2_poll[id], a, sh2_pc(id), pd_vdp))
ash2_end_run(8);
out_16to8:
if (a & 1)
d &= 0xff;
@ -616,7 +631,6 @@ out_16to8:
u32 p32x_sh2_read16(u32 a, int id)
{
int pd_vdp = 0;
u32 d = 0;
if (id == 0 && a < sizeof(Pico32xMem->sh2_rom_m))
@ -636,13 +650,14 @@ u32 p32x_sh2_read16(u32 a, int id)
if ((a & 0x0fffff00) == 0x4000) {
d = p32x_sh2reg_read16(a, id);
goto out_pd;
goto out;
}
if ((a & 0x0fffff00) == 0x4100) {
d = p32x_vdp_read16(a);
pd_vdp = 1;
goto out_pd;
if (p32x_poll_detect(&sh2_poll[id], a, sh2_pc(id), 1))
ash2_end_run(8);
goto out;
}
if ((a & 0x0fffff00) == 0x4200) {
@ -654,10 +669,6 @@ u32 p32x_sh2_read16(u32 a, int id)
id ? 's' : 'm', a, d, sh2_pc(id));
return d;
out_pd:
if (p32x_poll_detect(&sh2_poll[id], a, sh2_pc(id), pd_vdp))
ash2_end_run(8);
out:
elprintf(EL_32X, "%csh2 r16 [%08x] %04x @%06x",
id ? 's' : 'm', a, d, sh2_pc(id));

144
pico/32x/pwm.c Normal file
View file

@ -0,0 +1,144 @@
#include "../pico_int.h"
static int pwm_line_samples;
static int pwm_cycles;
static int pwm_mult;
static int pwm_ptr;
int pwm_frame_smp_cnt;
void p32x_pwm_refresh(void)
{
int cycles = Pico32x.regs[0x32 / 2];
int frame_samples;
cycles = (cycles - 1) & 0x0fff;
if (cycles < 500) {
elprintf(EL_32X|EL_ANOMALY, "pwm: low cycle value: %d", cycles + 1);
cycles = 500;
}
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;
}
// irq for every sample??
// FIXME: we need to hit more than once per line :(
void p32x_pwm_irq_check(void)
{
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();
}
}
unsigned int p32x_pwm_read16(unsigned int a)
{
unsigned int d = 0;
int predict;
a &= 0x0e;
switch (a) {
case 0: // control
case 2: // cycle
return Pico32x.regs[(0x30 + a) / 2];
case 4: // L ch
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",
pwm_frame_smp_cnt, (pwm_line_samples * scanlines_total) >> 16, predict);
if (pwm_frame_smp_cnt > predict + 3)
d |= P32XP_FULL;
else if (pwm_frame_smp_cnt == 0 || pwm_frame_smp_cnt < predict - 1)
d |= P32XP_EMPTY;
break;
}
return d;
}
void p32x_pwm_write16(unsigned int a, unsigned int d)
{
a &= 0x0e;
if (a == 0) // control
Pico32x.regs[0x30 / 2] = d;
else if (a == 2) { // cycle
Pico32x.regs[0x32 / 2] = d & 0x0fff;
p32x_pwm_refresh();
Pico32x.pwm_irq_sample_cnt = 0; // resets?
}
else if (a <= 8) {
d &= 0x0fff;
if (d > pwm_cycles)
d = pwm_cycles;
d = (d - pwm_cycles / 2) * pwm_mult;
if (a < 6) // L ch
Pico32xMem->pwm[pwm_ptr * 2] = d;
else if (a == 6) // R ch
Pico32xMem->pwm[pwm_ptr * 2 + 1] = d;
else // MONO
Pico32xMem->pwm[pwm_ptr * 2] = Pico32xMem->pwm[pwm_ptr * 2 + 1] = d;
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);
}
}
}
void p32x_pwm_update(int *buf32, int length, int stereo)
{
extern int pwm_ptr;
short *pwmb;
int step;
int p = 0;
if (pwm_ptr <= 16) // at least some samples..
return;
step = (pwm_ptr << 16) / length; // FIXME: division..
pwmb = Pico32xMem->pwm;
if (stereo)
{
while (length-- > 0) {
*buf32++ += pwmb[0];
*buf32++ += pwmb[1];
p += step;
pwmb += (p >> 16) * 2;
p &= 0xffff;
}
}
else
{
while (length-- > 0) {
*buf32++ += pwmb[0];
p += step;
pwmb += (p >> 16) * 2;
p &= 0xffff;
}
}
elprintf(EL_STATUS, "pwm_update: pwm_ptr %d, len %d, step %04x, done %d",
pwm_ptr, length, step, (pwmb - Pico32xMem->pwm) / 2);
pwm_ptr = 0;
}