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-rw-r--r--src/survive_cal.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/src/survive_cal.c b/src/survive_cal.c
index 760692c..2ed1986 100644
--- a/src/survive_cal.c
+++ b/src/survive_cal.c
@@ -96,6 +96,14 @@ void survive_cal_install( struct SurviveContext * ctx )
cd->stage = 1;
cd->ctx = ctx;
+ cd->hmd = survive_get_so_by_name( ctx, "HMD" );
+ if( !cd->hmd )
+ {
+ SV_ERROR( "Error: cannot find any devices labeled HMD. Required for calibration" );
+ free( cd );
+ return;
+ }
+
ootx_packet_clbk = ootx_packet_clbk_d;
ctx->calptr = cd;