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MPU-401: Revert some unnecessary changes, fixes the NT 3.1 Sound Blaster 16 driver regression.

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OBattler
2024-08-05 02:21:06 +02:00
parent 7d53c02c39
commit 28c1e7b8fb
1 changed files with 7 additions and 12 deletions
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19
src/sound/snd_mpu401.c
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@@ -342,11 +342,15 @@ MPU401_Reset(mpu_t *mpu)
static uint8_t static uint8_t
MPU401_ReadStatus(mpu_t *mpu) MPU401_ReadStatus(mpu_t *mpu)
{ {
uint8_t ret = 0x3f; uint8_t ret = 0x00;
if (mpu->state.cmd_pending) if (mpu->state.cmd_pending)
ret |= STATUS_OUTPUT_NOT_READY; ret = STATUS_OUTPUT_NOT_READY;
if (!mpu->queue_used) if (!mpu->queue_used)
ret |= STATUS_INPUT_NOT_READY; ret = STATUS_INPUT_NOT_READY;
ret |= 0x3f;
return ret; return ret;
} }
@@ -378,15 +382,6 @@ MPU401_WriteCommand(mpu_t *mpu, uint8_t val)
if ((val != 0xff) && (mpu->mode == M_UART)) if ((val != 0xff) && (mpu->mode == M_UART))
return; return;
if (mpu->state.reset) {
if (mpu->state.cmd_pending || (val != 0xff)) {
mpu->state.cmd_pending = val + 1;
return;
}
timer_disable(&mpu->mpu401_reset_callback);
mpu->state.reset = 0;
}
/* In Intelligent mode, UART-only variants of the MPU-401 only support commands 0x3F and 0xFF. */ /* In Intelligent mode, UART-only variants of the MPU-401 only support commands 0x3F and 0xFF. */
if (!mpu->intelligent && (val != 0x3f) && (val != 0xff)) if (!mpu->intelligent && (val != 0x3f) && (val != 0xff))
return; return;