mirror of
https://github.com/LIV2/WinUAE.git
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681 lines
23 KiB
C++
681 lines
23 KiB
C++
/*IBM AT -
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Write B0
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Write aa55
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Expects aa55 back*/
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#include <string.h>
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#include "ibm.h"
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#include "cpu.h"
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#include "device.h"
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#include "dma.h"
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#include "io.h"
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#include "pic.h"
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#include "pit.h"
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#include "sound_speaker.h"
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#include "timer.h"
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#include "video.h"
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#include "model.h"
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/*B0 to 40, two writes to 43, then two reads - value does not change!*/
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/*B4 to 40, two writes to 43, then two reads - value _does_ change!*/
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//Tyrian writes 4300 or 17512
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int displine;
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uint64_t PITCONST;
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uint64_t CGACONST;
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uint64_t MDACONST;
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uint64_t VGACONST1, VGACONST2;
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uint64_t RTCCONST;
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float cpuclock;
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float isa_timing, bus_timing;
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int firsttime=1;
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void setpitclock(float clock)
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{
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// printf("PIT clock %f\n",clock);
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cpuclock=clock;
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PITCONST = (uint64_t)(clock / 1193182.0 * (float)(1ull << 32));
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CGACONST = (uint64_t)((clock / (19687503.0/11.0)) * (float)(1ull << 32));
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MDACONST = (uint64_t)((clock / 2032125.0) * (float)(1ull << 32));
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VGACONST1 = (uint64_t)((clock / 25175000.0) * (float)(1ull << 32));
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VGACONST2 = (uint64_t)((clock / 28322000.0) * (float)(1ull << 32));
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isa_timing = clock/8000000.0;
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bus_timing = clock/(double)cpu_busspeed;
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video_updatetiming();
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// pclog("PITCONST=%f CGACONST=%f\n", PITCONST, CGACONST);
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// pclog("CPUMULTI=%g\n", ((14318184.0*(double)(1 << TIMER_SHIFT)) / (double)models[model].cpu[cpu_manufacturer].cpus[cpu].rspeed));
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xt_cpu_multi = (uint64_t)((14318184.0*(double)(1ull << 32)) / (double)cpu_get_speed());
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// pclog("egacycles %i egacycles2 %i temp %f clock %f\n",egacycles,egacycles2,temp,clock);
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/* if (video_recalctimings)
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video_recalctimings();*/
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RTCCONST = (uint64_t)((clock / 32768.0) * (float)(1ull << 32));
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TIMER_USEC = (uint64_t)((clock / 1000000.0) * (float)(1ull << 32));
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device_speed_changed();
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}
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//#define PITCONST (8000000.0/1193000.0)
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//#define PITCONST (cpuclock/1193000.0)
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void pit_reset(PIT *pit)
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{
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memset(pit, 0, sizeof(PIT));
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pit->l[0] = 0xFFFF;
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pit->l[1] = 0xFFFF;
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pit->l[2] = 0xFFFF;
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pit->m[0] = pit->m[1] = pit->m[2] = 0;
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pit->ctrls[0] = pit->ctrls[1] = pit->ctrls[2] = 0;
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pit->thit[0]=1;
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pit->gate[0] = pit->gate[1] = 1;
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pit->gate[2] = 0;
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pit->using_timer[0] = pit->using_timer[1] = pit->using_timer[2] = 1;
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}
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float pit_timer0_freq()
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{
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if (pit.l[0])
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return 1193182.0f/(float)pit.l[0];
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else
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return 1193182.0f/(float)0x10000;
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}
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static void pit_set_out(PIT *pit, int t, int out)
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{
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pit->set_out_funcs[t](out, pit->out[t]);
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pit->out[t] = out;
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}
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static int pit_read_timer(PIT *pit, int t)
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{
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// pclog("pit_read_timer: t=%i using_timer=%i m=%i enabled=%i\n", t, pit->using_timer[t], pit->m[t], timer_is_enabled(&pit->timer[t]));
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if (pit->using_timer[t] && !(pit->m[t] == 3 && !pit->gate[t]) && timer_is_enabled(&pit->timer[t]))
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{
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int read = (int)((timer_get_remaining_u64(&pit->timer[t])) / PITCONST);
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// pclog(" read %i %08x %016llx\n", t, read, timer_get_remaining_u64(&pit->timer[t]));
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if (pit->m[t] == 2)
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read++;
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if (read < 0)
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read = 0;
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if (read > 0x10000)
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read = 0x10000;
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if (pit->m[t] == 3)
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read <<= 1;
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return read;
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}
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if (pit->m[t] == 2)
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return pit->count[t] + 1;
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return pit->count[t];
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}
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/*Dump timer count back to pit->count[], and disable timer. This should be used
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when stopping a PIT timer, to ensure the correct value can be read back.*/
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static void pit_dump_and_disable_timer(PIT *pit, int t)
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{
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if (pit->using_timer[t] && timer_is_enabled(&pit->timer[t]))
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{
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pit->count[t] = pit_read_timer(pit, t);
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timer_disable(&pit->timer[t]);
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}
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}
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static void pit_load(PIT *pit, int t)
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{
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int l = pit->l[t] ? pit->l[t] : 0x10000;
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pit->newcount[t] = 0;
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pit->disabled[t] = 0;
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// pclog("pit_load: t=%i l=%x m=%i %016llx\n", t, l, pit->m[t], PITCONST);
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switch (pit->m[t])
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{
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case 0: /*Interrupt on terminal count*/
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pit->count[t] = l;
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if (pit->using_timer[t])
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timer_set_delay_u64(&pit->timer[t], (uint64_t)(l * PITCONST));
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pit_set_out(pit, t, 0);
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pit->thit[t] = 0;
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pit->enabled[t] = pit->gate[t];
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break;
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case 1: /*Hardware retriggerable one-shot*/
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pit->enabled[t] = 1;
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break;
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case 2: /*Rate generator*/
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if (pit->initial[t])
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{
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pit->count[t] = l - 1;
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if (pit->using_timer[t])
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timer_set_delay_u64(&pit->timer[t], (uint64_t)((l - 1) * PITCONST));
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pit_set_out(pit, t, 1);
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pit->thit[t] = 0;
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}
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pit->enabled[t] = pit->gate[t];
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break;
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case 3: /*Square wave mode*/
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if (pit->initial[t])
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{
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pit->count[t] = l;
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if (pit->using_timer[t])
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timer_set_delay_u64(&pit->timer[t], (uint64_t)(((l + 1) >> 1) * PITCONST));
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pit_set_out(pit, t, 1);
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pit->thit[t] = 0;
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}
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pit->enabled[t] = pit->gate[t];
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// pclog("pit_load: square wave mode c=%x\n", );
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break;
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case 4: /*Software triggered stobe*/
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if (!pit->thit[t] && !pit->initial[t])
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pit->newcount[t] = 1;
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else
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{
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pit->count[t] = l;
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if (pit->using_timer[t])
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timer_set_delay_u64(&pit->timer[t], (uint64_t)(l * PITCONST));
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pit_set_out(pit, t, 0);
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pit->thit[t] = 0;
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}
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pit->enabled[t] = pit->gate[t];
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break;
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case 5: /*Hardware triggered stobe*/
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pit->enabled[t] = 1;
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break;
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}
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pit->initial[t] = 0;
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pit->running[t] = pit->enabled[t] && pit->using_timer[t] && !pit->disabled[t];
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if (pit->using_timer[t] && !pit->running[t])
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pit_dump_and_disable_timer(pit, t);
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// pclog("pit_load: t=%i running=%i thit=%i enabled=%i m=%i l=%x c=%g gate=%i\n", t, pit.running[t], pit.thit[t], pit.enabled[t], pit.m[t], pit.l[t], pit.c[t], pit.gate[t]);
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}
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void pit_set_gate_no_timer(PIT *pit, int t, int gate)
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{
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int l = pit->l[t] ? pit->l[t] : 0x10000;
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if (pit->disabled[t])
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{
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pit->gate[t] = gate;
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return;
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}
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switch (pit->m[t])
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{
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case 0: /*Interrupt on terminal count*/
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case 4: /*Software triggered stobe*/
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if (pit->using_timer[t] && !pit->running[t])
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timer_set_delay_u64(&pit->timer[t], (uint64_t)(l * PITCONST));
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pit->enabled[t] = gate;
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break;
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case 1: /*Hardware retriggerable one-shot*/
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case 5: /*Hardware triggered stobe*/
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if (gate && !pit->gate[t])
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{
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pit->count[t] = l;
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if (pit->using_timer[t])
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timer_set_delay_u64(&pit->timer[t], (uint64_t)(l * PITCONST));
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pit_set_out(pit, t, 0);
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pit->thit[t] = 0;
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pit->enabled[t] = 1;
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}
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break;
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case 2: /*Rate generator*/
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if (gate && !pit->gate[t])
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{
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pit->count[t] = l - 1;
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if (pit->using_timer[t])
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timer_set_delay_u64(&pit->timer[t], (uint64_t)(l * PITCONST));
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pit_set_out(pit, t, 1);
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pit->thit[t] = 0;
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}
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pit->enabled[t] = gate;
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break;
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case 3: /*Square wave mode*/
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if (gate && !pit->gate[t])
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{
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pit->count[t] = l;
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if (pit->using_timer[t])
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timer_set_delay_u64(&pit->timer[t], (uint64_t)(((l + 1) >> 1) * PITCONST));
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pit_set_out(pit, t, 1);
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pit->thit[t] = 0;
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}
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pit->enabled[t] = gate;
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break;
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}
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pit->gate[t] = gate;
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pit->running[t] = pit->enabled[t] && pit->using_timer[t] && !pit->disabled[t];
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if (pit->using_timer[t] && !pit->running[t])
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pit_dump_and_disable_timer(pit, t);
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// pclog("pit_set_gate: t=%i gate=%i\n", t, gate);
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}
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void pit_set_gate(PIT *pit, int t, int gate)
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{
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// pclog("pit_set_gate: t=%i gate=%i\n", t, gate);
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if (pit->disabled[t])
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{
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pit->gate[t] = gate;
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return;
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}
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pit_set_gate_no_timer(pit, t, gate);
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}
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static void pit_over(PIT *pit, int t)
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{
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int l = pit->l[t] ? pit->l[t] : 0x10000;
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if (pit->disabled[t])
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{
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pit->count[t] += 0xffff;
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if (pit->using_timer[t])
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timer_advance_u64(&pit->timer[t], (uint64_t)(0xffff * PITCONST));
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return;
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}
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// if (t == 2) pclog("pit_over: t=%i l=%x c=%llx hit=%i %016llx\n", t, pit->l[t], timer_get_remaining_u64(&pit->timer[t]), pit->thit[t], tsc);
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switch (pit->m[t])
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{
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case 0: /*Interrupt on terminal count*/
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case 1: /*Hardware retriggerable one-shot*/
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if (!pit->thit[t])
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pit_set_out(pit, t, 1);
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pit->thit[t] = 1;
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pit->count[t] += 0xffff;
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if (pit->using_timer[t])
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timer_advance_u64(&pit->timer[t], (uint64_t)(0xffff * PITCONST));
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break;
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case 2: /*Rate generator*/
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pit->count[t] += l;
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if (pit->using_timer[t])
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timer_advance_u64(&pit->timer[t], (uint64_t)(l * PITCONST));
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pit_set_out(pit, t, 0);
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pit_set_out(pit, t, 1);
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break;
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case 3: /*Square wave mode*/
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if (pit->out[t])
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{
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pit_set_out(pit, t, 0);
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pit->count[t] += (l >> 1);
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if (pit->using_timer[t])
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timer_advance_u64(&pit->timer[t], (uint64_t)((l >> 1) * PITCONST));
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}
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else
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{
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pit_set_out(pit, t, 1);
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pit->count[t] += ((l + 1) >> 1);
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if (pit->using_timer[t])
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timer_advance_u64(&pit->timer[t], (uint64_t)(((l + 1) >> 1) * PITCONST));
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}
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// if (!t) pclog("pit_over: square wave mode c=%x %lli %f\n", pit.c[t], tsc, PITCONST);
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break;
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case 4: /*Software triggered strove*/
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if (!pit->thit[t])
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{
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pit_set_out(pit, t, 0);
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pit_set_out(pit, t, 1);
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}
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if (pit->newcount[t])
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{
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pit->newcount[t] = 0;
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pit->count[t] += l;
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if (pit->using_timer[t])
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timer_advance_u64(&pit->timer[t], (uint64_t)(l * PITCONST));
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}
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else
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{
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pit->thit[t] = 1;
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pit->count[t] += 0xffff;
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if (pit->using_timer[t])
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timer_advance_u64(&pit->timer[t], (uint64_t)(0xffff * PITCONST));
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}
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break;
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case 5: /*Hardware triggered strove*/
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if (!pit->thit[t])
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{
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pit_set_out(pit, t, 0);
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pit_set_out(pit, t, 1);
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}
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pit->thit[t] = 1;
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pit->count[t] += 0xffff;
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if (pit->using_timer[t])
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timer_advance_u64(&pit->timer[t], (uint64_t)(0xffff * PITCONST));
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break;
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}
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pit->running[t] = pit->enabled[t] && pit->using_timer[t] && !pit->disabled[t];
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if (pit->using_timer[t] && !pit->running[t])
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pit_dump_and_disable_timer(pit, t);
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}
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void pit_write(uint16_t addr, uint8_t val, void *p)
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{
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PIT *pit = (PIT *)p;
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int t;
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// /*if (val != 0x40) */pclog("Write PIT %04X %02X %04X:%08X %i %i\n",addr,val,CS,cpu_state.pc,ins, pit->gate[0]);
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switch (addr&3)
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{
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case 3: /*CTRL*/
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if ((val&0xC0)==0xC0)
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{
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if (!(val&0x20))
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{
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if (val & 2)
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pit->rl[0] = pit_read_timer(pit, 0);
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if (val & 4)
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pit->rl[1] = pit_read_timer(pit, 1);
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if (val & 8)
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pit->rl[2] = pit_read_timer(pit, 2);
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}
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if (!(val & 0x10))
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{
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if (val & 2)
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{
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pit->read_status[0] = (pit->ctrls[0] & 0x3f) | (pit->out[0] ? 0x80 : 0);
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pit->do_read_status[0] = 1;
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}
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if (val & 4)
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{
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pit->read_status[1] = (pit->ctrls[1] & 0x3f) | (pit->out[1] ? 0x80 : 0);
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pit->do_read_status[1] = 1;
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}
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if (val & 8)
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{
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pit->read_status[2] = (pit->ctrls[2] & 0x3f) | (pit->out[2] ? 0x80 : 0);
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pit->do_read_status[2] = 1;
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}
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}
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return;
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}
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t = val >> 6;
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pit->ctrl=val;
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if ((val>>7)==3)
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{
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printf("Bad PIT reg select\n");
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return;
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// dumpregs();
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// exit(-1);
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}
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// printf("CTRL write %02X\n",val);
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if (!(pit->ctrl&0x30))
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{
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pit->rl[t] = pit_read_timer(pit, t);
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// pclog("Timer latch %f %04X %04X\n",pit->c[0],pit->rl[0],pit->l[0]);
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pit->ctrl |= 0x30;
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pit->rereadlatch[t] = 0;
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pit->rm[t] = 3;
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pit->latched[t] = 1;
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}
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else
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{
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pit->ctrls[t] = val;
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pit->rm[t]=pit->wm[t]=(pit->ctrl>>4)&3;
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pit->m[t]=(val>>1)&7;
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if (pit->m[t]>5)
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pit->m[t]&=3;
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if (!(pit->rm[t]))
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{
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pit->rm[t]=3;
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pit->rl[t] = pit_read_timer(pit, t);
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}
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pit->rereadlatch[t]=1;
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pit->initial[t] = 1;
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if (!pit->m[t])
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pit_set_out(pit, t, 0);
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else
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pit_set_out(pit, t, 1);
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pit->disabled[t] = 1;
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// pclog("ppispeakon %i\n",ppispeakon);
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}
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pit->wp=0;
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pit->thit[t]=0;
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break;
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case 0: case 1: case 2: /*Timers*/
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t=addr&3;
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// if (t==2) ppispeakon=speakon=0;
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// pclog("Write timer %02X %i\n",pit.ctrls[t],pit.wm[t]);
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switch (pit->wm[t])
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{
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case 1:
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pit->l[t]=val;
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pit_load(pit, t);
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break;
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case 2:
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pit->l[t]=(val<<8);
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pit_load(pit, t);
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break;
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case 0:
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pit->l[t]&=0xFF;
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pit->l[t]|=(val<<8);
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pit_load(pit, t);
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pit->wm[t]=3;
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break;
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case 3:
|
|
pit->l[t]&=0xFF00;
|
|
pit->l[t]|=val;
|
|
pit->wm[t]=0;
|
|
break;
|
|
}
|
|
speakval=(((float)pit->l[2]/(float)pit->l[0])*0x4000)-0x2000;
|
|
// printf("Speakval now %i\n",speakval);
|
|
// if (speakval>0x2000)
|
|
// printf("Speaker overflow - %i %i %04X %04X\n",pit.l[0],pit.l[2],pit.l[0],pit.l[2]);
|
|
if (speakval>0x2000) speakval=0x2000;
|
|
/* if (!pit.l[t])
|
|
{
|
|
pit.l[t]|=0x10000;
|
|
pit.c[t]=pit.l[t]*PITCONST;
|
|
}*/
|
|
break;
|
|
}
|
|
}
|
|
|
|
uint8_t pit_read(uint16_t addr, void *p)
|
|
{
|
|
PIT *pit = (PIT *)p;
|
|
int t;
|
|
uint8_t temp = 0xff;
|
|
// printf("Read PIT %04X\n",addr);
|
|
switch (addr&3)
|
|
{
|
|
case 0: case 1: case 2: /*Timers*/
|
|
t = addr & 3;
|
|
if (pit->do_read_status[t])
|
|
{
|
|
pit->do_read_status[t] = 0;
|
|
temp = pit->read_status[t];
|
|
break;
|
|
}
|
|
if (pit->rereadlatch[addr & 3] && !pit->latched[addr & 3])
|
|
{
|
|
pit->rereadlatch[addr & 3] = 0;
|
|
pit->rl[t] = pit_read_timer(pit, t);
|
|
}
|
|
switch (pit->rm[addr & 3])
|
|
{
|
|
case 0:
|
|
temp = pit->rl[addr & 3] >> 8;
|
|
pit->rm[addr & 3] = 3;
|
|
pit->latched[addr & 3] = 0;
|
|
pit->rereadlatch[addr & 3] = 1;
|
|
break;
|
|
case 1:
|
|
temp = (pit->rl[addr & 3]) & 0xFF;
|
|
pit->latched[addr & 3] = 0;
|
|
pit->rereadlatch[addr & 3] = 1;
|
|
break;
|
|
case 2:
|
|
temp = (pit->rl[addr & 3]) >> 8;
|
|
pit->latched[addr & 3] = 0;
|
|
pit->rereadlatch[addr & 3] = 1;
|
|
break;
|
|
case 3:
|
|
temp = (pit->rl[addr & 3]) & 0xFF;
|
|
if (pit->m[addr & 3] & 0x80)
|
|
pit->m[addr & 3] &= 7;
|
|
else
|
|
pit->rm[addr & 3] = 0;
|
|
break;
|
|
}
|
|
break;
|
|
case 3: /*Control*/
|
|
temp = pit->ctrl;
|
|
break;
|
|
}
|
|
// pclog("%02X\n", temp);
|
|
// printf("%02X %i %i %04X:%04X %i\n",temp,pit.rm[addr&3],pit.wp,cs>>4,pc, ins);
|
|
return temp;
|
|
}
|
|
|
|
void pit_timer_over(void *p)
|
|
{
|
|
PIT_nr *pit_nr = (PIT_nr *)p;
|
|
PIT *pit = pit_nr->pit;
|
|
int timer = pit_nr->nr;
|
|
// pclog("pit_timer_over %i\n", timer);
|
|
|
|
pit_over(pit, timer);
|
|
}
|
|
|
|
void pit_clock(PIT *pit, int t)
|
|
{
|
|
if (pit->thit[t] || !pit->enabled[t])
|
|
return;
|
|
|
|
if (pit->using_timer[t])
|
|
return;
|
|
|
|
pit->count[t] -= (pit->m[t] == 3) ? 2 : 1;
|
|
if (!pit->count[t])
|
|
pit_over(pit, t);
|
|
}
|
|
|
|
void pit_set_using_timer(PIT *pit, int t, int using_timer)
|
|
{
|
|
// pclog("pit_set_using_timer: t=%i using_timer=%i\n", t, using_timer);
|
|
timer_process();
|
|
if (pit->using_timer[t] && !using_timer)
|
|
pit->count[t] = pit_read_timer(pit, t);
|
|
pit->running[t] = pit->enabled[t] && using_timer && !pit->disabled[t];
|
|
if (!pit->using_timer[t] && using_timer && pit->running[t])
|
|
timer_set_delay_u64(&pit->timer[t], (uint64_t)(pit->count[t] * PITCONST));
|
|
else if (!pit->running[t])
|
|
timer_disable(&pit->timer[t]);
|
|
pit->using_timer[t] = using_timer;
|
|
}
|
|
|
|
void pit_set_out_func(PIT *pit, int t, void (*func)(int new_out, int old_out))
|
|
{
|
|
pit->set_out_funcs[t] = func;
|
|
}
|
|
|
|
void pit_null_timer(int new_out, int old_out)
|
|
{
|
|
}
|
|
|
|
void pit_irq0_timer(int new_out, int old_out)
|
|
{
|
|
if (new_out && !old_out)
|
|
picint(1);
|
|
if (!new_out)
|
|
picintc(1);
|
|
}
|
|
|
|
void pit_irq0_timer_pcjr(int new_out, int old_out)
|
|
{
|
|
if (new_out && !old_out)
|
|
{
|
|
picint(1);
|
|
pit_clock(&pit, 1);
|
|
}
|
|
if (!new_out)
|
|
picintc(1);
|
|
}
|
|
|
|
void pit_irq0_ps2(int new_out, int old_out)
|
|
{
|
|
//pclog("pit_irq0_ps2 %i %i\n", new_out, old_out);
|
|
if (new_out && !old_out)
|
|
{
|
|
picint(1);
|
|
pit_set_gate_no_timer(&pit2, 0, 1);
|
|
}
|
|
if (!new_out)
|
|
picintc(1);
|
|
if (!new_out && old_out)
|
|
pit_clock(&pit2, 0);
|
|
}
|
|
|
|
void pit_refresh_timer_xt(int new_out, int old_out)
|
|
{
|
|
if (new_out && !old_out)
|
|
dma_channel_read(0);
|
|
}
|
|
|
|
void pit_refresh_timer_at(int new_out, int old_out)
|
|
{
|
|
if (new_out && !old_out)
|
|
ppi.pb ^= 0x10;
|
|
}
|
|
|
|
void pit_speaker_timer(int new_out, int old_out)
|
|
{
|
|
int l;
|
|
|
|
speaker_update();
|
|
|
|
l = pit.l[2] ? pit.l[2] : 0x10000;
|
|
if (l < 25)
|
|
speakon = 0;
|
|
else
|
|
speakon = new_out;
|
|
ppispeakon = new_out;
|
|
}
|
|
|
|
void pit_nmi_ps2(int new_out, int old_out)
|
|
{
|
|
nmi = new_out;
|
|
if (nmi)
|
|
nmi_auto_clear = 1;
|
|
}
|
|
|
|
void pit_init()
|
|
{
|
|
pit_reset(&pit);
|
|
|
|
io_sethandler(0x0040, 0x0004, pit_read, NULL, NULL, pit_write, NULL, NULL, &pit);
|
|
pit.gate[0] = pit.gate[1] = 1;
|
|
pit.gate[2] = 0;
|
|
pit.using_timer[0] = pit.using_timer[1] = pit.using_timer[2] = 1;
|
|
|
|
pit.pit_nr[0].nr = 0;
|
|
pit.pit_nr[1].nr = 1;
|
|
pit.pit_nr[2].nr = 2;
|
|
pit.pit_nr[0].pit = pit.pit_nr[1].pit = pit.pit_nr[2].pit = &pit;
|
|
|
|
timer_add(&pit.timer[0], pit_timer_over, (void *)&pit.pit_nr[0], 0);
|
|
timer_add(&pit.timer[1], pit_timer_over, (void *)&pit.pit_nr[1], 0);
|
|
timer_add(&pit.timer[2], pit_timer_over, (void *)&pit.pit_nr[2], 0);
|
|
|
|
pit_set_out_func(&pit, 0, pit_irq0_timer);
|
|
pit_set_out_func(&pit, 1, pit_null_timer);
|
|
pit_set_out_func(&pit, 2, pit_speaker_timer);
|
|
}
|
|
|
|
void pit_ps2_init()
|
|
{
|
|
pit_reset(&pit2);
|
|
|
|
io_sethandler(0x0044, 0x0001, pit_read, NULL, NULL, pit_write, NULL, NULL, &pit2);
|
|
io_sethandler(0x0047, 0x0001, pit_read, NULL, NULL, pit_write, NULL, NULL, &pit2);
|
|
|
|
pit2.gate[0] = 0;
|
|
pit2.using_timer[0] = 0;
|
|
pit2.disabled[0] = 1;
|
|
|
|
pit2.pit_nr[0].nr = 0;
|
|
pit2.pit_nr[0].pit = &pit2;
|
|
|
|
timer_add(&pit2.timer[0], pit_timer_over, (void *)&pit2.pit_nr[0], 0);
|
|
|
|
pit_set_out_func(&pit, 0, pit_irq0_ps2);
|
|
pit_set_out_func(&pit2, 0, pit_nmi_ps2);
|
|
}
|
|
|