| /* This file is part of the Dreamcast function library. |
| * Please see libdream.c for further details. |
| * |
| * (c)2000 Dan Potter |
| * modify BERO |
| */ |
| #include "aica.h" |
| |
| #include <arch/irq.h> |
| #include <dc/spu.h> |
| |
| /* #define dc_snd_base ((volatile unsigned char *)0x00800000) */ /* arm side */ |
| #define dc_snd_base ((volatile unsigned char *)0xa0700000) /* dc side */ |
| |
| /* Some convienence macros */ |
| #define SNDREGADDR(x) (0xa0700000 + (x)) |
| #define CHNREGADDR(ch,x) SNDREGADDR(0x80*(ch)+(x)) |
| |
| |
| #define SNDREG32(x) (*(volatile unsigned long *)SNDREGADDR(x)) |
| #define SNDREG8(x) (*(volatile unsigned char *)SNDREGADDR(x)) |
| #define CHNREG32(ch, x) (*(volatile unsigned long *)CHNREGADDR(ch,x)) |
| #define CHNREG8(ch, x) (*(volatile unsigned long *)CHNREGADDR(ch,x)) |
| |
| #define G2_LOCK(OLD) \ |
| do { \ |
| if (!irq_inside_int()) \ |
| OLD = irq_disable(); \ |
| /* suspend any G2 DMA here... */ \ |
| while((*(volatile unsigned int *)0xa05f688c) & 0x20) \ |
| ; \ |
| } while(0) |
| |
| #define G2_UNLOCK(OLD) \ |
| do { \ |
| /* resume any G2 DMA here... */ \ |
| if (!irq_inside_int()) \ |
| irq_restore(OLD); \ |
| } while(0) |
| |
| |
| void aica_init() { |
| int i, j, old = 0; |
| |
| /* Initialize AICA channels */ |
| G2_LOCK(old); |
| SNDREG32(0x2800) = 0x0000; |
| |
| for (i=0; i<64; i++) { |
| for (j=0; j<0x80; j+=4) { |
| if ((j&31)==0) g2_fifo_wait(); |
| CHNREG32(i, j) = 0; |
| } |
| g2_fifo_wait(); |
| CHNREG32(i,0) = 0x8000; |
| CHNREG32(i,20) = 0x1f; |
| } |
| |
| SNDREG32(0x2800) = 0x000f; |
| g2_fifo_wait(); |
| G2_UNLOCK(old); |
| } |
| |
| /* Translates a volume from linear form to logarithmic form (required by |
| the AICA chip */ |
| /* int logs[] = { |
| |
| 0, 40, 50, 58, 63, 68, 73, 77, 80, 83, 86, 89, 92, 94, 97, 99, 101, 103, |
| 105, 107, 109, 111, 112, 114, 116, 117, 119, 120, 122, 123, 125, 126, 127, |
| 129, 130, 131, 133, 134, 135, 136, 137, 139, 140, 141, 142, 143, 144, 145, |
| 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 156, 157, 158, 159, |
| 160, 161, 162, 162, 163, 164, 165, 166, 166, 167, 168, 169, 170, 170, 171, |
| 172, 172, 173, 174, 175, 175, 176, 177, 177, 178, 179, 180, 180, 181, 182, |
| 182, 183, 183, 184, 185, 185, 186, 187, 187, 188, 188, 189, 190, 190, 191, |
| 191, 192, 193, 193, 194, 194, 195, 196, 196, 197, 197, 198, 198, 199, 199, |
| 200, 201, 201, 202, 202, 203, 203, 204, 204, 205, 205, 206, 206, 207, 207, |
| 208, 208, 209, 209, 210, 210, 211, 211, 212, 212, 213, 213, 214, 214, 215, |
| 215, 216, 216, 217, 217, 217, 218, 218, 219, 219, 220, 220, 221, 221, 222, |
| 222, 222, 223, 223, 224, 224, 225, 225, 225, 226, 226, 227, 227, 228, 228, |
| 228, 229, 229, 230, 230, 230, 231, 231, 232, 232, 232, 233, 233, 234, 234, |
| 234, 235, 235, 236, 236, 236, 237, 237, 238, 238, 238, 239, 239, 240, 240, |
| 240, 241, 241, 241, 242, 242, 243, 243, 243, 244, 244, 244, 245, 245, 245, |
| 246, 246, 247, 247, 247, 248, 248, 248, 249, 249, 249, 250, 250, 250, 251, |
| 251, 251, 252, 252, 252, 253, 253, 253, 254, 254, 254, 255 |
| |
| }; */ |
| |
| const static unsigned char logs[] = { |
| 0, 15, 22, 27, 31, 35, 39, 42, 45, 47, 50, 52, 55, 57, 59, 61, |
| 63, 65, 67, 69, 71, 73, 74, 76, 78, 79, 81, 82, 84, 85, 87, 88, |
| 90, 91, 92, 94, 95, 96, 98, 99, 100, 102, 103, 104, 105, 106, |
| 108, 109, 110, 111, 112, 113, 114, 116, 117, 118, 119, 120, 121, |
| 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, |
| 135, 136, 137, 138, 138, 139, 140, 141, 142, 143, 144, 145, 146, |
| 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 156, |
| 157, 158, 159, 160, 160, 161, 162, 163, 164, 164, 165, 166, 167, |
| 167, 168, 169, 170, 170, 171, 172, 173, 173, 174, 175, 176, 176, |
| 177, 178, 178, 179, 180, 181, 181, 182, 183, 183, 184, 185, 185, |
| 186, 187, 187, 188, 189, 189, 190, 191, 191, 192, 193, 193, 194, |
| 195, 195, 196, 197, 197, 198, 199, 199, 200, 200, 201, 202, 202, |
| 203, 204, 204, 205, 205, 206, 207, 207, 208, 209, 209, 210, 210, |
| 211, 212, 212, 213, 213, 214, 215, 215, 216, 216, 217, 217, 218, |
| 219, 219, 220, 220, 221, 221, 222, 223, 223, 224, 224, 225, 225, |
| 226, 227, 227, 228, 228, 229, 229, 230, 230, 231, 232, 232, 233, |
| 233, 234, 234, 235, 235, 236, 236, 237, 237, 238, 239, 239, 240, |
| 240, 241, 241, 242, 242, 243, 243, 244, 244, 245, 245, 246, 246, |
| 247, 247, 248, 248, 249, 249, 250, 250, 251, 251, 252, 252, 253, 254, 255 |
| }; |
| |
| /* For the moment this is going to have to suffice, until we really |
| figure out what these mean. */ |
| #define AICA_PAN(x) ((x)==0x80?(0):((x)<0x80?(0x1f):(0x0f))) |
| #define AICA_VOL(x) (0xff - logs[128 + (((x) & 0xff) / 2)]) |
| //#define AICA_VOL(x) (0xff - logs[x&255]) |
| |
| static inline unsigned AICA_FREQ(unsigned freq) { |
| unsigned long freq_lo, freq_base = 5644800; |
| int freq_hi = 7; |
| |
| /* Need to convert frequency to floating point format |
| (freq_hi is exponent, freq_lo is mantissa) |
| Formula is ferq = 44100*2^freq_hi*(1+freq_lo/1024) */ |
| while (freq < freq_base && freq_hi > -8) { |
| freq_base >>= 1; |
| --freq_hi; |
| } |
| while (freq < freq_base && freq_hi > -8) { |
| freq_base >>= 1; |
| freq_hi--; |
| } |
| freq_lo = (freq<<10) / freq_base; |
| return (freq_hi << 11) | (freq_lo & 1023); |
| } |
| |
| /* Sets up a sound channel completely. This is generally good if you want |
| a quick and dirty way to play notes. If you want a more comprehensive |
| set of routines (more like PC wavetable cards) see below. |
| |
| ch is the channel to play on (0 - 63) |
| smpptr is the pointer to the sound data; if you're running off the |
| SH4, then this ought to be (ptr - 0xa0800000); otherwise it's just |
| ptr. Basically, it's an offset into sound ram. |
| mode is one of the mode constants (16 bit, 8 bit, ADPCM) |
| nsamp is the number of samples to play (not number of bytes!) |
| freq is the sampling rate of the sound |
| vol is the volume, 0 to 0xff (0xff is louder) |
| pan is a panning constant -- 0 is left, 128 is center, 255 is right. |
| |
| This routine (and the similar ones) owe a lot to Marcus' sound example -- |
| I hadn't gotten quite this far into dissecting the individual regs yet. */ |
| void aica_play(int ch,int mode,unsigned long smpptr,int loopst,int loopend,int freq,int vol,int pan,int loopflag) { |
| /* int i; |
| */ |
| int val; |
| int old = 0; |
| |
| /* Stop the channel (if it's already playing) */ |
| aica_stop(ch); |
| /* doesn't seem to be needed, but it's here just in case */ |
| /* |
| for (i=0; i<256; i++) { |
| asm("nop"); |
| asm("nop"); |
| asm("nop"); |
| asm("nop"); |
| } |
| */ |
| G2_LOCK(old); |
| /* Envelope setup. The first of these is the loop point, |
| e.g., where the sample starts over when it loops. The second |
| is the loop end. This is the full length of the sample when |
| you are not looping, or the loop end point when you are (though |
| storing more than that is a waste of memory if you're not doing |
| volume enveloping). */ |
| CHNREG32(ch, 8) = loopst & 0xffff; |
| CHNREG32(ch, 12) = loopend & 0xffff; |
| |
| /* Write resulting values */ |
| CHNREG32(ch, 24) = AICA_FREQ(freq); |
| |
| /* Set volume, pan, and some other things that we don't know what |
| they do =) */ |
| CHNREG32(ch, 36) = AICA_PAN(pan) | (0xf<<8); |
| /* Convert the incoming volume and pan into hardware values */ |
| /* Vol starts at zero so we can ramp */ |
| vol = AICA_VOL(vol); |
| CHNREG32(ch, 40) = 0x24 | (vol<<8); |
| /* Convert the incoming volume and pan into hardware values */ |
| /* Vol starts at zero so we can ramp */ |
| |
| /* If we supported volume envelopes (which we don't yet) then |
| this value would set that up. The top 4 bits determine the |
| envelope speed. f is the fastest, 1 is the slowest, and 0 |
| seems to be an invalid value and does weird things). The |
| default (below) sets it into normal mode (play and terminate/loop). |
| CHNREG32(ch, 16) = 0xf010; |
| */ |
| CHNREG32(ch, 16) = 0x1f; /* No volume envelope */ |
| |
| |
| /* Set sample format, buffer address, and looping control. If |
| 0x0200 mask is set on reg 0, the sample loops infinitely. If |
| it's not set, the sample plays once and terminates. We'll |
| also set the bits to start playback here. */ |
| CHNREG32(ch, 4) = smpptr & 0xffff; |
| val = 0xc000 | 0x0000 | (mode<<7) | (smpptr >> 16); |
| if (loopflag) val|=0x200; |
| |
| CHNREG32(ch, 0) = val; |
| |
| G2_UNLOCK(old); |
| |
| /* Enable playback */ |
| /* CHNREG32(ch, 0) |= 0xc000; */ |
| g2_fifo_wait(); |
| |
| #if 0 |
| for (i=0xff; i>=vol; i--) { |
| if ((i&7)==0) g2_fifo_wait(); |
| CHNREG32(ch, 40) = 0x24 | (i<<8);; |
| } |
| |
| g2_fifo_wait(); |
| #endif |
| } |
| |
| /* Stop the sound on a given channel */ |
| void aica_stop(int ch) { |
| g2_write_32(CHNREGADDR(ch, 0),(g2_read_32(CHNREGADDR(ch, 0)) & ~0x4000) | 0x8000); |
| g2_fifo_wait(); |
| } |
| |
| |
| /* The rest of these routines can change the channel in mid-stride so you |
| can do things like vibrato and panning effects. */ |
| |
| /* Set channel volume */ |
| void aica_vol(int ch,int vol) { |
| // g2_write_8(CHNREGADDR(ch, 41),AICA_VOL(vol)); |
| g2_write_32(CHNREGADDR(ch, 40),(g2_read_32(CHNREGADDR(ch, 40))&0xffff00ff)|(AICA_VOL(vol)<<8) ); |
| g2_fifo_wait(); |
| } |
| |
| /* Set channel pan */ |
| void aica_pan(int ch,int pan) { |
| // g2_write_8(CHNREGADDR(ch, 36),AICA_PAN(pan)); |
| g2_write_32(CHNREGADDR(ch, 36),(g2_read_32(CHNREGADDR(ch, 36))&0xffffff00)|(AICA_PAN(pan)) ); |
| g2_fifo_wait(); |
| } |
| |
| /* Set channel frequency */ |
| void aica_freq(int ch,int freq) { |
| g2_write_32(CHNREGADDR(ch, 24),AICA_FREQ(freq)); |
| g2_fifo_wait(); |
| } |
| |
| /* Get channel position */ |
| int aica_get_pos(int ch) { |
| #if 1 |
| /* Observe channel ch */ |
| g2_write_32(SNDREGADDR(0x280c),(g2_read_32(SNDREGADDR(0x280c))&0xffff00ff) | (ch<<8)); |
| g2_fifo_wait(); |
| /* Update position counters */ |
| return g2_read_32(SNDREGADDR(0x2814)) & 0xffff; |
| #else |
| /* Observe channel ch */ |
| g2_write_8(SNDREGADDR(0x280d),ch); |
| /* Update position counters */ |
| return g2_read_32(SNDREGADDR(0x2814)) & 0xffff; |
| #endif |
| } |
