Merge pull request #3738 from sauloverissimo/fix/midi2-fb-direction

feat(midi2): derive function blocks from the GTB descriptor

1 files changed, 19 insertions, 0 deletions

diff --git a/examples/device/midi2_device/src/main.c b/examples/device/midi2_device/src/main.c
index ce052a20b..2c77652dc 100644
--- a/examples/device/midi2_device/src/main.c
+++ b/examples/device/midi2_device/src/main.c
@@ -546,6 +546,25 @@ void tud_midi2_set_itf_cb(uint8_t itf, uint8_t alt) {
   printf("[ALT] Host selected alt=%u\r\n", (unsigned)alt);
 }
 
+// PROTOTYPE: two Function Blocks with independent directions.
+//   FB0: output only, group 0   FB1: input only, group 1
+static const uint8_t gtb_two_blocks[] = {
+  TUD_MIDI2_GTB_HEADER(2),
+  TUD_MIDI2_GTB_BLOCK(1, MIDI2_GTB_OUTPUT_ONLY, 0, 1, 0),  // block 1: group 0
+  TUD_MIDI2_GTB_BLOCK(2, MIDI2_GTB_INPUT_ONLY,  1, 1, 0),  // block 2: group 1
+};
+
+const uint8_t* tud_midi2_gtb_desc_cb(uint8_t itf, uint16_t* len) {
+  (void)itf;
+  *len = sizeof(gtb_two_blocks);
+  return gtb_two_blocks;
+}
+
+const char* tud_midi2_fb_name_cb(uint8_t itf, uint8_t fb_idx) {
+  (void)itf;
+  return (fb_idx == 0) ? "Synth Out" : "Keys In";
+}
+
 //--------------------------------------------------------------------+
 // Initial Setup - Program Change, CC, Per-Note Management
 //--------------------------------------------------------------------+