+PS2_USE_USART = yes # uses hardware USART engine for PS/2 signal receive(recomened)
+#PS2_USE_INT = yes # uses external interrupt for falling edge of PS/2 clock pin
+#PS2_USE_BUSYWAIT = yes # uses primitive reference code
+
+
+# keyboard dependent files
+SRC = keymap.c \
+ matrix.c \
+ led.c
+
+
+ifdef PS2_USE_USART
+ SRC += protocol/ps2_usart.c
+ OPT_DEFS += -DPS2_USE_USART
+endif
+ifdef PS2_USE_INT
+ SRC += protocol/ps2.c
+ OPT_DEFS += -DPS2_USE_INT
+endif
+ifdef PS2_USE_BUSYWAIT
+ SRC += protocol/ps2.c
+ OPT_DEFS += -DPS2_USE_BUSYWAIT
+endif
+
+
+#CONFIG_H = config_pjrc_usart.h
+CONFIG_H = config.h