Init MPU asynchronously to avoid holding IOCHRDY

sw/mpu401/mpu401.c

@@ -69,6 +69,7 @@ bool MIDI_Available(void);
 
 static uint32_t MPU401_Event(Bitu val);
 static uint32_t MPU401_ResetDone(Bitu val);
+static uint32_t MPU401_InitHandler(Bitu val);
 static uint32_t MPU401_EOIHandler(Bitu val);
 static void MPU401_Reset(void);
 static void MPU401_EOIHandlerDispatch(void);
@@ -97,6 +98,8 @@ typedef enum MpuDataType MpuDataType; /* SOFTMPU */
 #define MSG_MPU_ACK             0xfe
 
 static bool config_versionfix = false;
+static bool config_delaysysex = false;
+static bool config_fakeallnotesoff = false;
 
 static struct {
     bool intelligent;
@@ -745,27 +748,30 @@ __force_inline static void MPU401_Reset(void) {
 /* HardMPU: Initialisation */
 void MPU401_Init(bool delaysysex, bool fakeallnotesoff)
 {
-    /* Initalise PIC code */
-    /* PIC_Init(); */
+    config_delaysysex = delaysysex;
+    config_fakeallnotesoff = fakeallnotesoff;
+    config_versionfix = false;
     if (!critical_section_is_initialized(&mpu_crit)) {
         critical_section_init(&mpu_crit);
     }
+    PIC_AddEvent(MPU401_InitHandler, 1000, 3);
+}
 
+uint32_t MPU401_InitHandler(Bitu val)
+{
     /* Initialise MIDI handler */
-    MIDI_Init(delaysysex, fakeallnotesoff);
-    if (!MIDI_Available()) return;
-
-    config_versionfix = false;
+    MIDI_Init(config_delaysysex, config_fakeallnotesoff);
+    if (!MIDI_Available()) return 0;
 
     mpu.queue_used=0;
     mpu.queue_pos=0;
     mpu.mode=M_UART;
 
     mpu.intelligent=true; /* Default is on */
-    if (!mpu.intelligent) return;
 
     /* SOFTMPU: Moved IRQ 9 handler init to asm */
     MPU401_Reset();
+    return 0;
 }
 
 #if 0

sw/mpuplay.cpp

@@ -23,6 +23,7 @@ void play_mpu() {
     PIC_Init();
     puts("pic inited on core 1");
 #endif
+    MPU401_Init(false, false);
 
     for (;;) {
         send_midi_byte();				// see if we need to send a byte	

sw/picogus.cpp

@@ -674,8 +674,6 @@ int main()
         gpio_set_drive_strength(UART_TX_PIN, GPIO_DRIVE_STRENGTH_12MA);
     }
     gpio_set_function(UART_TX_PIN, GPIO_FUNC_UART);
-    busy_wait_ms(100);
-    MPU401_Init(false, false);
 #endif // SOUND_MPU
 
 #ifdef PSRAM_CORE0