cdc_msc_hid: Limit number of endpoints used by STM32F4 for demo.

examples/device/cdc_msc_hid/src/tusb_config.h

@@ -74,7 +74,14 @@
 //------------- CLASS -------------//
 #define CFG_TUD_CDC              1
 #define CFG_TUD_MSC              1
+#if CFG_TUSB_MCU == OPT_MCU_STM32F4
+// STM32F4 does not have enough endpoints (4, including hardcoded control
+// endpoint) to enable CDC, MSC, and HID simultaneously, so disable HID as a
+// compromise.
+#define CFG_TUD_HID              0
+#else
 #define CFG_TUD_HID              1
+#endif
 
 #define CFG_TUD_MIDI             0
 #define CFG_TUD_VENDOR           0