From 95cfba9715c9913d3b66513cf68ada24cab91728 Mon Sep 17 00:00:00 2001
From: OBattler <oubattler@gmail.com>
Date: Sun, 4 Jun 2017 16:19:11 +0200
Subject: [PATCH] MPU-401 reset now sends ACK also in UART mode, fixes MEGAMID
 and possibly other programs.

---
 src/SOUND/snd_mpu401.c | 12 +++++++++++-
 src/SOUND/snd_mpu401.h |  4 ++++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/SOUND/snd_mpu401.c b/src/SOUND/snd_mpu401.c
index 97fece713..60e3bd1c6 100644
--- a/src/SOUND/snd_mpu401.c
+++ b/src/SOUND/snd_mpu401.c
@@ -162,7 +162,7 @@ static void MPU401_ResetDone(void *p)
 static void MPU401_WriteCommand(mpu_t *mpu, uint8_t val)
 {	
 	uint8_t i;
-	
+
 	if (mpu->state.reset) 
 	{
 		mpu->state.cmd_pending=val+1;
@@ -301,7 +301,9 @@ static void MPU401_WriteCommand(mpu_t *mpu, uint8_t val)
 			mpu401_reset_callback = MPU401_RESETBUSY * 33 * TIMER_USEC;
 			mpu->state.reset=1;
 			MPU401_Reset(mpu);
+#if 0
 			if (mpu->mode==M_UART) return;//do not send ack in UART mode
+#endif
 			break;
 		case 0x3f:	/* UART mode */
 			pclog("MPU-401:Set UART mode %X\n",val);
@@ -733,6 +735,14 @@ 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;
diff --git a/src/SOUND/snd_mpu401.h b/src/SOUND/snd_mpu401.h
index 86dfa2058..41c1e9240 100644
--- a/src/SOUND/snd_mpu401.h
+++ b/src/SOUND/snd_mpu401.h
@@ -43,6 +43,8 @@ typedef enum MpuDataType {T_OVERFLOW,T_MARK,T_MIDI_SYS,T_MIDI_NORM,T_COMMAND} Mp
 
 typedef struct mpu_t
 {
+	int uart_mode;
+	uint8_t rx_data;
 	int intelligent;
 	MpuMode mode;
 	int irq;
@@ -88,3 +90,5 @@ extern int mpu401_standalone_enable;
 
 void mpu401_device_add(void);
 device_t mpu401_device;
+
+void mpu401_uart_init(mpu_t *mpu, uint16_t addr);