cereal: fix frequency precision by changing from int to float (#36060)

cereal/messaging/socketmaster.cc

@@ -33,7 +33,7 @@ MessageContext message_context;
 struct SubMaster::SubMessage {
   std::string name;
   SubSocket *socket = nullptr;
-  int freq = 0;
+  float freq = 0.0f;
   bool updated = false, alive = false, valid = false, ignore_alive;
   uint64_t rcv_time = 0, rcv_frame = 0;
   void *allocated_msg_reader = nullptr;

cereal/services.py

@@ -109,12 +109,12 @@ def build_header():
   h += "#include <map>\n"
   h += "#include <string>\n"
 
-  h += "struct service { std::string name; bool should_log; int frequency; int decimation; };\n"
+  h += "struct service { std::string name; bool should_log; float frequency; int decimation; };\n"
   h += "static std::map<std::string, service> services = {\n"
   for k, v in SERVICE_LIST.items():
     should_log = "true" if v.should_log else "false"
     decimation = -1 if v.decimation is None else v.decimation
-    h += '  { "%s", {"%s", %s, %d, %d}},\n' % \
+    h += '  { "%s", {"%s", %s, %f, %d}},\n' % \
          (k, k, should_log, v.frequency, decimation)
   h += "};\n"