lufa: Add comment on INTERRUPT_CONTROL_ENDPOINT

This feature can block other executions and prevents converter
from handling signal.

Author: tmk

tmk_core/protocol/lufa.mk

@@ -41,6 +41,7 @@ VPATH += $(TMK_DIR)/$(TMK_LUFA_PATH)
 TMK_LUFA_OPTS  = -DUSB_DEVICE_ONLY
 TMK_LUFA_OPTS += -DUSE_FLASH_DESCRIPTORS
 TMK_LUFA_OPTS += -DUSE_STATIC_OPTIONS="(USB_DEVICE_OPT_FULLSPEED | USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL)"
+# Do not enable this for converters in particular, it blocks other tasks long.
 #TMK_LUFA_OPTS += -DINTERRUPT_CONTROL_ENDPOINT
 TMK_LUFA_OPTS += -DFIXED_CONTROL_ENDPOINT_SIZE=8
 TMK_LUFA_OPTS += -DFIXED_NUM_CONFIGURATIONS=1