added clearing functionality

SATES20-CPCL-DYNA/SATES20-CPCL-DYNA_fixed.template

@@ -23,6 +23,12 @@ record(bi, "$(SYSTEM):REMOVE") {
     field(ONAM, "proc")
 }
 
+record(bi, "$(SYSTEM):CLEAR") {
+    field(DESC, "Remove all currently defined PVs")
+    field(ZNAM, "idle")
+    field(ONAM, "proc")
+}
+
 record(waveform, "$(SYSTEM):LIST") {
     field(DESC, "List of currently defined PVs")
     field(FTVL, "CHAR")

SATES20-CPCL-DYNA/cfg/python/pvs.py

@@ -46,12 +46,25 @@ def cb_remove(value=None, **kwargs):
     pv_list.put(mk_printable_data(data))
 
 
+@toggle
+def cb_clear(value=None, **kwargs):
+    log.info(f"clear: {kwargs}")
+    data = {}
+    save_data(data, FN_ENTRIES)
+    mk_db(data, FN_DB_TMPL)
+    log.info(f"data: {data}")
+    pv_list.put(mk_printable_data(data))
+
+
 pv_add = PV("SATES20-DYNA:ADD")
 pv_add.add_callback(cb_add)
 
 pv_remove = PV("SATES20-DYNA:REMOVE")
 pv_remove.add_callback(cb_remove)
 
+pv_clear = PV("SATES20-DYNA:CLEAR")
+pv_clear.add_callback(cb_clear)
+
 
 def mk_printable_data(data):
     return "\n".join(f"{k} ({v})" for k, v in sorted(data.items()))