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Implemented Sound Blaster MIDI through the DSP (was surprisingly missing before). Native Windows 3.1 and NT Sound Blaster drivers can now use their DSP to drive the MIDI out.

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Added MIDI out config to pre-SB16's for this new change.
This commit is contained in:
TC1995
2017-05-10 18:29:16 +02:00
parent 53317aed28
commit 8576e2523b
5 changed files with 93 additions and 34 deletions
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75
src/SOUND/snd_mpu401.c
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@@ -528,6 +528,47 @@ static void MPU401_EOIHandlerDispatch(void *p)
MPU401_EOIHandler(mpu, 0);
}
uint8_t MPU401_ReadData(mpu_t *mpu)
{
uint8_t ret;
ret = MSG_MPU_ACK;
if (mpu->queue_used)
{
if (mpu->queue_pos>=MPU401_QUEUE) mpu->queue_pos-=MPU401_QUEUE;
ret=mpu->queue[mpu->queue_pos];
mpu->queue_pos++;mpu->queue_used--;
}
if (!mpu->intelligent) return ret;
if (mpu->queue_used == 0) picintc(1 << mpu->irq);
if (ret>=0xf0 && ret<=0xf7)
{ /* MIDI data request */
mpu->state.channel=ret&7;
mpu->state.data_onoff=0;
mpu->state.cond_req=0;
}
if (ret==MSG_MPU_COMMAND_REQ)
{
mpu->state.data_onoff=0;
mpu->state.cond_req=1;
if (mpu->condbuf.type!=T_OVERFLOW)
{
mpu->state.block_ack=1;
MPU401_WriteCommand(mpu, mpu->condbuf.value[0]);
if (mpu->state.command_byte) MPU401_WriteData(mpu, mpu->condbuf.value[1]);
}
mpu->condbuf.type=T_OVERFLOW;
}
if (ret==MSG_MPU_END || ret==MSG_MPU_CLOCK || ret==MSG_MPU_ACK) {
mpu->state.data_onoff=-1;
MPU401_EOIHandlerDispatch(mpu);
}
return ret;
}
static void mpu401_write(uint16_t addr, uint8_t val, void *p)
{
mpu_t *mpu = (mpu_t *)p;
@@ -554,39 +595,7 @@ static uint8_t mpu401_read(uint16_t addr, void *p)
switch (addr & 1)
{
case 0: //Read Data
ret = MSG_MPU_ACK;
if (mpu->queue_used)
{
if (mpu->queue_pos>=MPU401_QUEUE) mpu->queue_pos-=MPU401_QUEUE;
ret=mpu->queue[mpu->queue_pos];
mpu->queue_pos++;mpu->queue_used--;
}
if (!mpu->intelligent) return ret;
if (mpu->queue_used == 0) picintc(1 << mpu->irq);
if (ret>=0xf0 && ret<=0xf7)
{ /* MIDI data request */
mpu->state.channel=ret&7;
mpu->state.data_onoff=0;
mpu->state.cond_req=0;
}
if (ret==MSG_MPU_COMMAND_REQ)
{
mpu->state.data_onoff=0;
mpu->state.cond_req=1;
if (mpu->condbuf.type!=T_OVERFLOW)
{
mpu->state.block_ack=1;
MPU401_WriteCommand(mpu, mpu->condbuf.value[0]);
if (mpu->state.command_byte) MPU401_WriteData(mpu, mpu->condbuf.value[1]);
}
mpu->condbuf.type=T_OVERFLOW;
}
if (ret==MSG_MPU_END || ret==MSG_MPU_CLOCK || ret==MSG_MPU_ACK) {
mpu->state.data_onoff=-1;
MPU401_EOIHandlerDispatch(mpu);
}
ret = MPU401_ReadData(mpu);
break;
case 1: //Read Status