Add MIDI device implementation

Author: kirikak2

include/midi.h

@@ -0,0 +1,12 @@
+#ifndef MIDI_DEFINED_H_
+#define MIDI_DEFINED_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* MIDI_DEFINED_H_ */

src/midi.c

@@ -0,0 +1,18 @@
+#include <mrubyc.h>
+
+#include "../include/midi.h"
+#include "../include/usb_descriptors.h"
+#include "picoruby-prk-midi/include/prk-midi.h"
+
+uint8_t const cable_num = 0; // MIDI jack associated with USB endpoint
+uint8_t packet[4];
+
+void Midi_init(void)
+{
+  while(tud_midi_available()) tud_midi_packet_read(packet);
+}
+
+void Midi_stream_write(uint8_t* packet, uint8_t len)
+{
+  tud_midi_stream_write(cable_num, packet, len);
+}

src/usb_descriptors.c

@@ -33,7 +33,7 @@ tusb_desc_device_t desc_device =
   .bNumConfigurations = 0x01
 };
 
-#define STRING_DESC_ARR_SIZE 6
+#define STRING_DESC_ARR_SIZE 7
 
 #define PRK_CONF_SIZE 64
 
@@ -47,6 +47,7 @@ static char const *string_desc_arr[STRING_DESC_ARR_SIZE] =
   PRK_SERIAL,                    // 3: Serial
   "PRK CDC",                     // 4: CDC Interface
   "PRK MSC",                     // 5: MSC Interface
+  "PRK MIDI",                    // 6: MIDI Interface
 };
 
 // Invoked when received GET DEVICE DESCRIPTOR
@@ -61,9 +62,9 @@ tud_descriptor_device_cb(void)
 //--------------------------------------------------------------------+
 
 #ifdef PICORUBY_NO_MSC
-#define CONFIG_TOTAL_LEN    (TUD_CONFIG_DESC_LEN + TUD_CDC_DESC_LEN + TUD_HID_INOUT_DESC_LEN + TUD_HID_DESC_LEN)
+#define CONFIG_TOTAL_LEN    (TUD_CONFIG_DESC_LEN + TUD_CDC_DESC_LEN + TUD_HID_INOUT_DESC_LEN + TUD_HID_DESC_LEN + TUD_MIDI_DESC_LEN)
 #else
-#define CONFIG_TOTAL_LEN    (TUD_CONFIG_DESC_LEN + TUD_CDC_DESC_LEN + TUD_MSC_DESC_LEN + TUD_HID_INOUT_DESC_LEN + TUD_HID_DESC_LEN)
+#define CONFIG_TOTAL_LEN    (TUD_CONFIG_DESC_LEN + TUD_CDC_DESC_LEN + TUD_MSC_DESC_LEN + TUD_HID_INOUT_DESC_LEN + TUD_HID_DESC_LEN + TUD_MIDI_DESC_LEN)
 #endif
 
 #if CFG_TUSB_MCU == OPT_MCU_LPC175X_6X || CFG_TUSB_MCU == OPT_MCU_LPC177X_8X || CFG_TUSB_MCU == OPT_MCU_LPC40XX
@@ -112,6 +113,9 @@ tud_descriptor_device_cb(void)
 #define EPNUM_HID_IN   0x84
 #define EPNUM_JOYSTICK_IN 0x85
 
+#define EPNUM_MIDI_OUT  0x06
+#define EPNUM_MIDI_IN   0x86
+
 uint8_t const desc_hid_report[] =
 {
   TUD_HID_REPORT_DESC_KEYBOARD( HID_REPORT_ID(REPORT_ID_KEYBOARD         )),
@@ -131,6 +135,8 @@ enum
   ITF_NUM_CDC_DATA,
   ITF_NUM_HID,
   ITF_NUM_JOYSTICK,
+  ITF_NUM_MIDI,
+  ITF_NUM_MIDI_STREAMING,
 #ifndef PICORUBY_NO_MSC
   ITF_NUM_MSC,
 #endif
@@ -145,6 +151,9 @@ uint8_t const desc_fs_configuration[] =
   // Interface number, string index, EP notification address and size, EP data address (out, in) and size.
   TUD_CDC_DESCRIPTOR(ITF_NUM_CDC, 4, EPNUM_CDC_NOTIF, 8, EPNUM_CDC_OUT, EPNUM_CDC_IN, 64),
 
+  // Interface number, string index, EP Out & EP In address, EP size
+  TUD_MIDI_DESCRIPTOR(ITF_NUM_MIDI, 6, EPNUM_MIDI_OUT, EPNUM_MIDI_IN, 64),
+
 #ifndef PICORUBY_NO_MSC
   // Interface number, string index, EP Out & EP In address, EP size
   TUD_MSC_DESCRIPTOR(ITF_NUM_MSC, 5, EPNUM_MSC_OUT, EPNUM_MSC_IN, 64),

test/models/midi.rb

@@ -0,0 +1 @@
+../../lib/picoruby/mrbgems/picoruby-prk-midi/mrblib/midi.rb

tinyusb/tusb_config.h

@@ -97,7 +97,7 @@
 #define CFG_TUD_CDC               1
 #define CFG_TUD_MSC               1
 #define CFG_TUD_HID               2
-#define CFG_TUD_MIDI              0
+#define CFG_TUD_MIDI              1
 #define CFG_TUD_VENDOR            0
 
 // HID buffer size Should be sufficient to hold ID (if any) + Data
@@ -118,6 +118,10 @@
 // CDC Endpoint transfer buffer size, more is faster
 #define CFG_TUD_CDC_EP_BUFSIZE   (TUD_OPT_HIGH_SPEED ? 512 : 64)
 
+// MIDI FIFO size of TX and RX
+#define CFG_TUD_MIDI_RX_BUFSIZE   (TUD_OPT_HIGH_SPEED ? 512 : 64)
+#define CFG_TUD_MIDI_TX_BUFSIZE   (TUD_OPT_HIGH_SPEED ? 512 : 64)
+
 #ifdef __cplusplus
  }
 #endif