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Added changes to the Relative Tempo command of the MPU-401 (first introduced by DOSBox).

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This commit is contained in:
TC1995
2018-08-17 21:01:12 +02:00
parent d47646d42f
commit 051f5a4214
1 changed files with 6 additions and 12 deletions
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18
src/sound/snd_mpu401.c
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@@ -300,6 +300,7 @@ MPU401_WriteCommand(mpu_t *mpu, uint8_t val)
return;
case 0xb1: /* Reset relative tempo */
mpu->clock.old_tempo_rel=mpu->clock.tempo_rel;
mpu->clock.tempo_rel=40;
break;
@@ -363,8 +364,8 @@ MPU401_WriteData(mpu_t *mpu, uint8_t val)
case 0xe1: /* Set relative tempo */
mpu->state.command_byte=0;
if (val!=0x40) //default value
mpu401_log("MPU-401:Relative tempo change not implemented\n");
mpu->clock.old_tempo_rel=mpu->clock.tempo_rel;
mpu->clock.tempo_rel=val;
return;
case 0xe7: /* Set internal clock to host interval */
@@ -773,7 +774,7 @@ mpu401_read(uint16_t addr, void *priv)
case 1: //Read Status
if (mpu->state.cmd_pending) ret=STATUS_OUTPUT_NOT_READY;
if (!mpu->queue_used) ret=STATUS_INPUT_NOT_READY;
ret |= 0x3f; //FIXME: check with MPU401 TechRef
ret |= 0x3f;
mpu401_log("Read Status (0x331) %x\n", ret);
break;
@@ -825,8 +826,8 @@ MPU401_Event(void *priv)
next_event:
/* mpu401_event_callback = 0LL; */
new_time = (mpu->clock.tempo * mpu->clock.timebase);
if (new_time == 0) {
new_time = ((mpu->clock.tempo * mpu->clock.timebase * mpu->clock.tempo_rel)/0x40);
if (new_time == 0) {
mpu401_event_callback = 0LL;
return;
} else {
@@ -839,13 +840,6 @@ next_event:
void
mpu401_init(mpu_t *mpu, uint16_t addr, int irq, int mode)
{
#if 0
if (mode != M_INTELLIGENT) {
mpu401_uart_init(mpu, addr);
return;
}
#endif
mpu->status = STATUS_INPUT_NOT_READY;
mpu->irq = irq;
mpu->queue_used = 0;