altos/chaoskey: use both halves of the CRC

[fw/altos] / src / stmf0 / ao_crc.h

diff --git a/src/stmf0/ao_crc.h b/src/stmf0/ao_crc.h
index 7acc6f9c0e33df5cb610271d73f3669ffbe982c5..b6d91023bde46e4fa8ba37df4a1647f850973d47 100644 (file)
--- a/src/stmf0/ao_crc.h
+++ b/src/stmf0/ao_crc.h
@@ -35,7 +35,8 @@
 static inline uint16_t
 ao_crc_in_32_out_16(uint32_t v) {
        stm_crc.dr.u32 = v;
-       return stm_crc.dr.u16;
+       v = stm_crc.dr.u32;
+       return v ^ (v >> 16);
 }
 
 static inline uint16_t