CDC-like blocking behaviour for MIDI

Also added a dummy readout for MIDI into examples

2 files changed, 12 insertions, 0 deletions

diff --git a/examples/device/dynamic_configuration/src/main.c b/examples/device/dynamic_configuration/src/main.c
index 3ad13aefa..45786e99a 100644
--- a/examples/device/dynamic_configuration/src/main.c
+++ b/examples/device/dynamic_configuration/src/main.c
@@ -165,6 +165,12 @@ void midi_task(void)
 {
   static uint32_t start_ms = 0;
 
+  // The MIDI interface always creates input and output port/jack descriptors
+  // regardless of these being used or not. Therefore incoming traffic should be read
+  // (possibly just discarded) to avoid the sender blocking in IO
+  uint8_t packet[4];
+  while(tud_midi_available()) tud_midi_receive(packet);
+
   // send note every 1000 ms
   if (board_millis() - start_ms < 286) return; // not enough time
   start_ms += 286;
diff --git a/examples/device/midi_test/src/main.c b/examples/device/midi_test/src/main.c
index 96292dd6b..d92621fc9 100644
--- a/examples/device/midi_test/src/main.c
+++ b/examples/device/midi_test/src/main.c
@@ -125,6 +125,12 @@ void midi_task(void)
 {
   static uint32_t start_ms = 0;
 
+  // The MIDI interface always creates input and output port/jack descriptors
+  // regardless of these being used or not. Therefore incoming traffic should be read
+  // (possibly just discarded) to avoid the sender blocking in IO
+  uint8_t packet[4];
+  while(tud_midi_available()) tud_midi_receive(packet);
+
   // send note every 1000 ms
   if (board_millis() - start_ms < 286) return; // not enough time
   start_ms += 286;