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MPU-401 read data now clears IRQ in UART mode if it was pending, fixes stuck pending MPU-401 IRQ (and broken wave audio).

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This commit is contained in:
OBattler
2018-09-15 20:17:13 +02:00
parent 7f26f64882
commit 4e7d0e5b6b
1 changed files with 16 additions and 6 deletions
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22
src/sound/snd_mpu401.c
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@@ -8,7 +8,7 @@
*
* Roland MPU-401 emulation.
*
* Version: @(#)snd_mpu401.c 1.0.16 2018/09/11
* Version: @(#)snd_mpu401.c 1.0.17 2018/09/15
*
* Authors: Sarah Walker, <http://pcem-emulator.co.uk/>
* DOSBox Team,
@@ -117,7 +117,10 @@ MPU401_Reset(mpu_t *mpu)
{
uint8_t i;
picintc(1 << mpu->irq);
if (mpu->mode == M_INTELLIGENT) {
picintc(1 << mpu->irq);
mpu->state.irq_pending = 0;
}
mpu->mode = M_INTELLIGENT;
mpu->state.eoi_scheduled = 0;
@@ -128,7 +131,6 @@ MPU401_Reset(mpu_t *mpu)
mpu->state.cond_set = 0;
mpu->state.playing = 0;
mpu->state.run_irq = 0;
mpu->state.irq_pending = 0;
mpu->state.cmask = 0xff;
mpu->state.amask = mpu->state.tmask = 0;
mpu->state.midi_mask = 0xffff;
@@ -733,11 +735,19 @@ MPU401_ReadData(mpu_t *mpu)
}
/* Shouldn't this check mpu->mode? */
if (mpu->mode == M_UART)
return ret;
if (mpu->mode == M_UART) {
if (mpu->state.irq_pending) {
picintc(1 << mpu->irq);
mpu->state.irq_pending = 0;
}
if (mpu->queue_used == 0)
return ret;
}
if (mpu->queue_used == 0) {
picintc(1 << mpu->irq);
mpu->state.irq_pending = 0;
}
if ((ret >= 0xf0) && (ret <= 0xf7)) {
/* MIDI data request */