RaySollium99/libpicofe
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git-svn-id: file:///home/notaz/opt/svn/PicoDrive/platform@2 be3aeb3a-fb24-0410-a615-afba39da0efa
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notaz 2006-12-19 20:53:21 +00:00
commit 720ee7f624
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gp2x/940.c Normal file
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#include "940shared.h"
/* this code assumes that we live @ 0x3000000 bank */
//static volatile unsigned short *gp2x_memregs = (void *) 0x0xbd000000;
//static volatile unsigned long *gp2x_memregl = (void *) 0x0xbd000000;
static _940_data_t *shared_data = (_940_data_t *) 0x100000;
static _940_ctl_t *shared_ctl = (_940_ctl_t *) 0x200000;
YM2612 *ym2612_940;
int *mix_buffer;
// from init.s
void wait_irq(void);
void spend_cycles(int c);
void cache_clean(void);
void cache_clean_flush(void);
// asm volatile ("mov r0, #0" ::: "r0");
// asm volatile ("mcr p15, 0, r0, c7, c6, 0" ::: "r0"); /* flush dcache */
// asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer */
void Main940(int startvector)
{
ym2612_940 = &shared_data->ym2612;
mix_buffer = shared_data->mix_buffer;
// debug
shared_ctl->vstarts[startvector]++;
asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0");
/* unmask IRQs */
for (;; shared_ctl->loopc++)
{
/*
while (!shared_ctl->busy)
{
//shared_ctl->waitc++;
spend_cycles(256);
}
*/
if (!shared_ctl->busy)
{
wait_irq();
}
switch (shared_ctl->job)
{
case JOB940_YM2612INIT:
shared_ctl->writebuff0[0] = shared_ctl->writebuff1[0] = 0xffff;
YM2612Init_(shared_ctl->baseclock, shared_ctl->rate);
break;
case JOB940_YM2612RESETCHIP:
YM2612ResetChip_();
break;
case JOB940_PICOSTATELOAD:
YM2612PicoStateLoad_();
break;
case JOB940_YM2612UPDATEONE: {
int i, dw, *wbuff;
if (shared_ctl->writebuffsel == 1) {
wbuff = (int *) shared_ctl->writebuff1;
} else {
wbuff = (int *) shared_ctl->writebuff0;
}
/* playback all writes */
for (i = 2048/2; i > 0; i--) {
UINT16 d;
dw = *wbuff++;
d = dw;
if (d == 0xffff) break;
YM2612Write_(d >> 8, d);
d = (dw>>16);
if (d == 0xffff) break;
YM2612Write_(d >> 8, d);
}
YM2612UpdateOne_(0, shared_ctl->length, shared_ctl->stereo);
// cache_clean_flush();
cache_clean();
// asm volatile ("mov r0, #0" ::: "r0");
// asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer, should be done on nonbuffered write */
break;
}
}
shared_ctl->busy = 0;
}
}