--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/L1/cfile/dummy_tch_data.c	Thu Jun 09 00:02:41 2016 +0000
@@ -0,0 +1,24 @@
+/*
+ * [rt]x_tch_data() calls appear to be some old API for passing CSD payloads
+ * between L1 and the higher layers.  If this API was ever used at all,
+ * it is so old that even the TSM30 code does not use it; the new API that
+ * took its place is dll_data_[du]l().  However, the code in l1_cmplx.c
+ * still calls the old API, thus stub functions are needed.  TSM30 and
+ * Leonardo versions have these stubs in the dl1_com module, but that
+ * module no longer exists in our version - see l1_isr_glue.c for the
+ * explanation.  The LoCosto version has a stub (in sys_dummy.c) only
+ * for tx_tch_data() - the other function gets called only when IDS
+ * is not enabled.
+ *
+ * This module provides the necessary stubs for our version.
+ */
+ 
+void rx_tch_data()
+{
+  return;
+}
+ 
+char *tx_tch_data()
+{
+  return(0);
+}