- remove tuh_midi_read_poll(), auto schedule EP in when set_config() and xfer_cb as well as ep read()

- de-dup tuh_midi_get_num_rx/tx_cables
- add tuh_midi_read_available()

examples/host/midi_rx/src/main.c

@@ -38,7 +38,7 @@
 static uint8_t midi_dev_addr = 0;
 
 //--------------------------------------------------------------------+
-// MACRO CONSTANT TYPEDEF PROTYPES
+// MACRO CONSTANT TYPEDEF PROTOTYPES
 //--------------------------------------------------------------------+
 void led_blinking_task(void);
 void midi_host_rx_task(void);
@@ -92,10 +92,9 @@ void midi_host_rx_task(void) {
   if (!midi_dev_addr || !tuh_midi_configured(midi_dev_addr)) {
     return;
   }
-  if (tuh_midih_get_num_rx_cables(midi_dev_addr) < 1) {
+  if (tuh_midi_get_num_rx_cables(midi_dev_addr) < 1) {
     return;
   }
-  tuh_midi_read_poll(midi_dev_addr);
 }
 
 //--------------------------------------------------------------------+

src/class/midi/midi_host.c

@@ -26,7 +26,7 @@
 
 #include "tusb_option.h"
 
-#if (TUSB_OPT_HOST_ENABLED && CFG_TUH_MIDI)
+#if (CFG_TUH_ENABLED && CFG_TUH_MIDI)
 
 #include "host/usbh.h"
 #include "host/usbh_pvt.h"
@@ -195,8 +195,7 @@ bool midih_xfer_cb(uint8_t dev_addr, uint8_t ep_addr, xfer_result_t result, uint
       }
     }
 
-    // prepare for next transfer if needed
+    tu_edpt_stream_read_xfer(dev_addr, &p_midi_host->ep_stream.rx); // prepare for next transfer
-    tu_edpt_stream_read_xfer(dev_addr, &p_midi_host->ep_stream.rx);
   } else if (ep_addr == p_midi_host->ep_stream.tx.ep_addr) {
     if (tuh_midi_tx_cb) {
       tuh_midi_tx_cb(dev_addr);
@@ -416,12 +415,6 @@ bool midih_open(uint8_t rhport, uint8_t dev_addr, tusb_desc_interface_t const *d
   return true;
 }
 
-bool tuh_midi_configured(uint8_t dev_addr) {
-  midih_interface_t *p_midi_host = find_midi_by_daddr(dev_addr);
-  TU_VERIFY(p_midi_host != NULL);
-  return p_midi_host->configured;
-}
-
 bool midih_set_config(uint8_t dev_addr, uint8_t itf_num) {
   (void) itf_num;
   midih_interface_t *p_midi_host = find_midi_by_daddr(dev_addr);
@@ -432,18 +425,20 @@ bool midih_set_config(uint8_t dev_addr, uint8_t itf_num) {
     tuh_midi_mount_cb(dev_addr, p_midi_host->ep_in, p_midi_host->ep_out, p_midi_host->num_cables_rx, p_midi_host->num_cables_tx);
   }
 
+  tu_edpt_stream_read_xfer(dev_addr, &p_midi_host->ep_stream.rx); // prepare for incoming data
+
   // No special config things to do for MIDI
   usbh_driver_set_config_complete(dev_addr, p_midi_host->itf_num);
   return true;
 }
 
 //--------------------------------------------------------------------+
-// Stream API
+// API
 //--------------------------------------------------------------------+
-bool tuh_midi_read_poll(uint8_t dev_addr) {
+bool tuh_midi_configured(uint8_t dev_addr) {
   midih_interface_t *p_midi_host = find_midi_by_daddr(dev_addr);
   TU_VERIFY(p_midi_host != NULL);
-  return tu_edpt_stream_read_xfer(dev_addr, &p_midi_host->ep_stream.rx) > 0;
+  return p_midi_host->configured;
 }
 
 uint32_t tuh_midi_stream_write(uint8_t dev_addr, uint8_t cable_num, uint8_t const *buffer, uint32_t bufsize) {
@@ -557,24 +552,27 @@ uint32_t tuh_midi_stream_flush(uint8_t dev_addr) {
 //--------------------------------------------------------------------+
 // Helper
 //--------------------------------------------------------------------+
-uint8_t tuh_midih_get_num_tx_cables (uint8_t dev_addr)
+uint8_t tuh_midi_get_num_tx_cables (uint8_t dev_addr) {
-{
   midih_interface_t *p_midi_host = find_midi_by_daddr(dev_addr);
-  TU_VERIFY(p_midi_host != NULL);
+  TU_VERIFY(p_midi_host != NULL, 0);
-  TU_VERIFY(p_midi_host->ep_out != 0); // returns 0 if fails
+  TU_VERIFY(p_midi_host->ep_out != 0, 0);
   return p_midi_host->num_cables_tx;
 }
 
-uint8_t tuh_midih_get_num_rx_cables (uint8_t dev_addr)
+uint8_t tuh_midi_get_num_rx_cables (uint8_t dev_addr) {
-{
   midih_interface_t *p_midi_host = find_midi_by_daddr(dev_addr);
-  TU_VERIFY(p_midi_host != NULL);
+  TU_VERIFY(p_midi_host != NULL, 0);
-  TU_VERIFY(p_midi_host->ep_in != 0); // returns 0 if fails
+  TU_VERIFY(p_midi_host->ep_in != 0, 0);
   return p_midi_host->num_cables_rx;
 }
 
-bool tuh_midi_packet_read (uint8_t dev_addr, uint8_t packet[4])
+uint32_t tuh_midi_read_available(uint8_t dev_addr) {
-{
+  midih_interface_t *p_midi_host = find_midi_by_daddr(dev_addr);
+  TU_VERIFY(p_midi_host != NULL);
+  return tu_edpt_stream_read_available(&p_midi_host->ep_stream.rx);
+}
+
+bool tuh_midi_packet_read (uint8_t dev_addr, uint8_t packet[4]) {
   midih_interface_t *p_midi_host = find_midi_by_daddr(dev_addr);
   TU_VERIFY(p_midi_host != NULL);
   TU_VERIFY(tu_edpt_stream_read_available(&p_midi_host->ep_stream.rx) >= 4);
@@ -661,6 +659,7 @@ uint32_t tuh_midi_stream_read(uint8_t dev_addr, uint8_t *p_cable_num, uint8_t *p
         bytes_to_add_to_stream = 1;
       }
     }
+
     for (uint8_t idx = 1; idx <= bytes_to_add_to_stream; idx++) {
       *p_buffer++ = p_midi_host->stream_read.buffer[idx];
     }
@@ -678,30 +677,6 @@ uint32_t tuh_midi_stream_read(uint8_t dev_addr, uint8_t *p_cable_num, uint8_t *p
   return bytes_buffered;
 }
 
-uint8_t tuh_midi_get_num_rx_cables(uint8_t dev_addr)
-{
-  midih_interface_t *p_midi_host = find_midi_by_daddr(dev_addr);
-  TU_VERIFY(p_midi_host != NULL);
-  uint8_t num_cables = 0;
-  if (p_midi_host)
-  {
-    num_cables = p_midi_host->num_cables_rx;
-  }
-  return num_cables;
-}
-
-uint8_t tuh_midi_get_num_tx_cables(uint8_t dev_addr)
-{
-  midih_interface_t *p_midi_host = find_midi_by_daddr(dev_addr);
-  TU_VERIFY(p_midi_host != NULL);
-  uint8_t num_cables = 0;
-  if (p_midi_host)
-  {
-    num_cables = p_midi_host->num_cables_tx;
-  }
-  return num_cables;
-}
-
 #if CFG_MIDI_HOST_DEVSTRINGS
 static uint8_t find_string_index(midih_interface_t *ptr, uint8_t jack_id)
 {

src/class/midi/midi_host.h

@@ -58,22 +58,34 @@
 #endif
 
 //--------------------------------------------------------------------+
-// Application API (Single Interface)
+// Application API
 //--------------------------------------------------------------------+
 bool     tuh_midi_configured      (uint8_t dev_addr);
 
-// return the number of virtual midi cables on the device's OUT endpoint
-uint8_t tuh_midih_get_num_tx_cables (uint8_t dev_addr);
-
 // return the number of virtual midi cables on the device's IN endpoint
-uint8_t tuh_midih_get_num_rx_cables (uint8_t dev_addr);
+uint8_t tuh_midi_get_num_rx_cables(uint8_t dev_addr);
 
-// request available data from the device. tuh_midi_message_received_cb() will
+// return the number of virtual midi cables on the device's OUT endpoint
-// be called if the device has any data to send. Otherwise, the device will
+uint8_t tuh_midi_get_num_tx_cables(uint8_t dev_addr);
-// respond NAK. This function blocks until the transfer completes or the
+
-// devices sends NAK.
+#if CFG_MIDI_HOST_DEVSTRINGS
-// This function will return false if the hardware is busy.
+uint8_t tuh_midi_get_rx_cable_istrings(uint8_t dev_addr, uint8_t* istrings, uint8_t max_istrings);
-bool tuh_midi_read_poll( uint8_t dev_addr );
+uint8_t tuh_midi_get_tx_cable_istrings(uint8_t dev_addr, uint8_t* istrings, uint8_t max_istrings);
+uint8_t tuh_midi_get_all_istrings(uint8_t dev_addr, const uint8_t** istrings);
+#endif
+
+// return the raw number of bytes available from device endpoint.
+// Note: this is related but not the same as number of stream bytes available.
+uint32_t tuh_midi_read_available(uint8_t dev_addr);
+
+//--------------------------------------------------------------------+
+// Packet API
+//--------------------------------------------------------------------+
+
+// Read a raw MIDI packet from the connected device
+// This function does not parse the packet format
+// Return true if a packet was returned
+bool tuh_midi_packet_read (uint8_t dev_addr, uint8_t packet[4]);
 
 // Queue a packet to the device. The application
 // must call tuh_midi_stream_flush to actually have the
@@ -82,6 +94,10 @@ bool tuh_midi_read_poll( uint8_t dev_addr );
 // Returns true if the packet was successfully queued.
 bool tuh_midi_packet_write (uint8_t dev_addr, uint8_t const packet[4]);
 
+//--------------------------------------------------------------------+
+// Stream API
+//--------------------------------------------------------------------+
+
 // Queue a message to the device. The application
 // must call tuh_midi_stream_flush to actually have the
 // data go out.
@@ -101,19 +117,6 @@ uint32_t tuh_midi_stream_flush( uint8_t dev_addr);
 // it properly.
 uint32_t tuh_midi_stream_read (uint8_t dev_addr, uint8_t *p_cable_num, uint8_t *p_buffer, uint16_t bufsize);
 
-// Read a raw MIDI packet from the connected device
-// This function does not parse the packet format
-// Return true if a packet was returned
-bool tuh_midi_packet_read (uint8_t dev_addr, uint8_t packet[4]);
-
-uint8_t tuh_midi_get_num_rx_cables(uint8_t dev_addr);
-uint8_t tuh_midi_get_num_tx_cables(uint8_t dev_addr);
-#if CFG_MIDI_HOST_DEVSTRINGS
-uint8_t tuh_midi_get_rx_cable_istrings(uint8_t dev_addr, uint8_t* istrings, uint8_t max_istrings);
-uint8_t tuh_midi_get_tx_cable_istrings(uint8_t dev_addr, uint8_t* istrings, uint8_t max_istrings);
-uint8_t tuh_midi_get_all_istrings(uint8_t dev_addr, const uint8_t** istrings);
-#endif
-
 //--------------------------------------------------------------------+
 // Callbacks (Weak is optional)
 //--------------------------------------------------------------------+