3509e83475
Fixes to issues with interrupts. Added more support for exceptions going to the panic screen. Test commands for PSG and OPL3 now work.
127 lines
2.7 KiB
C
127 lines
2.7 KiB
C
/*
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* Commands to work with the sound devices
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*/
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#include "timers.h"
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#include "sound_cmds.h"
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#include "sound_reg.h"
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#include "snd/psg.h"
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/*
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* Play a sound on the PSG
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*/
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short psg_test(short channel, int argc, char * argv[]) {
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int i;
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long target_time;
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psg_tone(0, 34923);
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psg_attenuation(0, 0);
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target_time = timers_jiffies() + 20;
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while (target_time > timers_jiffies()) ;
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psg_tone(1, 44000);
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psg_attenuation(1, 0);
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target_time = timers_jiffies() + 20;
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while (target_time > timers_jiffies()) ;
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psg_tone(2, 52325);
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psg_attenuation(2, 0);
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target_time = timers_jiffies() + 60;
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while (target_time > timers_jiffies()) ;
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psg_attenuation(0, 15);
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psg_tone(0, 0);
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psg_attenuation(1, 15);
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psg_tone(1, 0);
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psg_attenuation(2, 15);
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psg_tone(2, 0);
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return 0;
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}
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const unsigned char opl3_tone_on[] = {
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0x01,0x00, /* initialise */
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0x05,0x01, /* OPL3 mode, necessary for stereo */
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0xc0,0x31, /* both channel, parallel connection */
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/* Carrier settings
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* no amplitude modulation (D7=0), no vibrato (D6=0)
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* sustained envelope type (D5=1), KSR=0 (D4=0)
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* frequency multiplier=1 (D4-D0=1) */
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0x23,0x21,
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/* no volume decrease with pitch (D7-D6=0)
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* no attenuation (D5-D0=0) */
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0x43,0x00,
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/* fast attack (D7-D4=0xF) and decay (D3-D0=0xF) */
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0x63,0xff,
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/* high sustain level (D7-D4=0), slow release rate (D3-D0=5) */
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0x83,0x05,
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/* Modulator settings
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* sustained envelope type, frequency multiplier=0 */
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0x20,0x20,
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/* maximum attenuation, no volume decrease with pitch */
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0x40,0x3f,
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/* Since the modulator signal is attenuated as much as possible, these
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* next two values shouldn't have any effect. */
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0x60,0x44,
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0x80,0x05,
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/* 440Hz */
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0xa0,0x41,
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/* block 0, key on */
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0xb0,0x32,
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/* end of sequence marker */
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0xff
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};
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const unsigned char opl3_tone_off[] = {
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/* block 0, key off */
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0xb0,0x00,
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/* end of sequence marker */
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0xff
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};
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/*
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* Play a sound on the OPL3
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*/
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short opl3_test(short channel, int argc, char * argv[]) {
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short i;
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unsigned char reg;
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unsigned char data;
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long target_time;
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i = 0;
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while (1) {
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reg = opl3_tone_on[i++];
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if (reg == 0xff) {
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break;
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} else {
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data = opl3_tone_on[i++];
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OPL3_PORT[reg] = data;
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}
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}
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target_time = timers_jiffies() + 60;
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while (target_time > timers_jiffies()) ;
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i = 0;
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while (1) {
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reg = opl3_tone_off[i++];
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if (reg == 0xff) {
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break;
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} else {
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data = opl3_tone_off[i++];
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OPL3_PORT[reg] = data;
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}
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}
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return 0;
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}
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