diff --git a/SENT-box/firmware/Makefile b/SENT-box/firmware/Makefile
index 9c6334c..6d51aec 100644
--- a/SENT-box/firmware/Makefile
+++ b/SENT-box/firmware/Makefile
@@ -144,6 +144,7 @@ ASMXSRC = $(ALLXASMSRC)
 # Inclusion directories.
 INCDIR = $(CONFDIR) $(ALLINC) \
    io \
+   ../../ext/libfirmware/sent/include \
    ../../ext/libfirmware/stm32-util
 
 # Define C warning options here.
diff --git a/SENT-box/firmware/sent_conf.h b/SENT-box/firmware/sent_conf.h
index 4180913..1907b3d 100644
--- a/SENT-box/firmware/sent_conf.h
+++ b/SENT-box/firmware/sent_conf.h
@@ -8,6 +8,4 @@
 #define SENT_CHANNELS_NUM 4 // Number of sent channels
 #endif
 
-#define SENT_MSG_DATA_SIZE      6
-/* Status + two 12-bit signals + CRC */
-#define SENT_MSG_PAYLOAD_SIZE   (1 + SENT_MSG_DATA_SIZE + 1)  // Size of payload
+#include "sent_constants.h"
diff --git a/ext/libfirmware b/ext/libfirmware
index 330a1e5..63ffcdb 160000
--- a/ext/libfirmware
+++ b/ext/libfirmware
@@ -1 +1 @@
-Subproject commit 330a1e55979606cddfd164234fc75dc9d8a0a470
+Subproject commit 63ffcdbe07015e46609248d88caf4f7d31bcd7db