RPC: fix bool() and begin() return value

This allows `while (!SerialRPC)` construct to work

Author: facchinm

libraries/RPC/src/RPC.cpp

@@ -178,8 +178,14 @@ int RPCClass::begin(long unsigned int np, uint16_t nd) {
 	* The rpmsg service is initiate by the remote processor, on H7 new_service_cb
 	* callback is received on service creation. Wait for the callback
 	*/
-  OPENAMP_Wait_EndPointready(&rp_endpoints[ENDPOINT_RAW], millis() + 500);
-  OPENAMP_Wait_EndPointready(&rp_endpoints[ENDPOINT_RESPONSE], millis() + 500);
+  auto err = OPENAMP_Wait_EndPointready(&rp_endpoints[ENDPOINT_RAW], millis() + 500);
+  err |= OPENAMP_Wait_EndPointready(&rp_endpoints[ENDPOINT_RESPONSE], millis() + 500);
+
+  if (err == 0) {
+    initialized = true;
+  } else {
+    return 0;
+  }
 
 	// Send first dummy message to enable the channel
 	uint8_t message = 0x00;
@@ -226,6 +232,8 @@ int RPCClass::begin(long unsigned int np, uint16_t nd) {
     return 0;
   }
 
+  initialized = true;
+
   return 1;
 }
 

libraries/openamp_arduino/src/openamp.c

@@ -169,14 +169,16 @@ int OPENAMP_check_for_message(void)
 
 unsigned long millis();
 
-void OPENAMP_Wait_EndPointready(struct rpmsg_endpoint *rp_ept, size_t deadline)
+int OPENAMP_Wait_EndPointready(struct rpmsg_endpoint *rp_ept, size_t deadline)
 {
   while(!is_rpmsg_ept_ready(rp_ept) && (millis() < deadline)) {
     MAILBOX_Poll(rvdev.vdev);
   }
   if (millis() >= deadline) {
     printf("OPENAMP_Wait_EndPointready %X timed out\n\r", (unsigned int)rp_ept);
+    return -1;
   }
+  return 0;
 }
 
 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

libraries/openamp_arduino/src/openamp.h

@@ -49,7 +49,7 @@ int OPENAMP_create_endpoint(struct rpmsg_endpoint *ept, const char *name,
 int OPENAMP_check_for_message(void);
 
 /* Wait loop on endpoint ready ( message dest address is know)*/
-void OPENAMP_Wait_EndPointready(struct rpmsg_endpoint *rp_ept, size_t deadline);
+int OPENAMP_Wait_EndPointready(struct rpmsg_endpoint *rp_ept, size_t deadline);
 
 #ifdef __cplusplus
 }