modbus_master: fix modbus master example

examples/modbusmaster/mbmaster_main.c

@@ -280,7 +280,7 @@ int main(int argc, FAR char *argv[])
 
   if (ret != OK)
     {
-      fprintf(stderr, "mbmaster_main: ",
+      fprintf(stderr, "mbmaster_main: "
               "ERROR: mbmaster_initialize failed: %d\n", ret);
       goto errout;
     }
@@ -292,11 +292,15 @@ int main(int argc, FAR char *argv[])
 
   if (ret != OK)
     {
-      fprintf(stderr, "mbmaster_main: ",
+      fprintf(stderr, "mbmaster_main: "
               "ERROR: mbmaster_pollthread create failed: %d\n", ret);
       goto errout_with_initialize;
     }
 
+  /* Work around to give time to pthread_create run the modbus poller */
+
+  usleep(100000);
+
   printf("Sending %d requests to slave %d\n",
          MBMASTER_REQUESTS_COUNT, SLAVE_ID);
 

modbus/mb_m.c

@@ -429,6 +429,13 @@ eMBErrorCode eMBMasterPoll(void)
 
           vMBMasterRunResRelease();
           break;
+
+          case EV_MASTER_PROCESS_SUCCESS:
+          case EV_MASTER_ERROR_RESPOND_TIMEOUT:
+          case EV_MASTER_ERROR_RECEIVE_DATA:
+          case EV_MASTER_ERROR_EXECUTE_FUNCTION:
+          default:
+          break;
         }
     }
 

modbus/rtu/mbrtu_m.c

@@ -278,7 +278,7 @@ bool xMBMasterRTUReceiveFSM(void)
 
   /* Always read the character. */
 
-  xMBMasterPortSerialGetByte((uint8_t *) & ucByte);
+  xMBMasterPortSerialGetByte((int8_t *) & ucByte);
 
   switch (eRcvState)
     {
@@ -397,6 +397,10 @@ bool xMBMasterRTUTransmitFSM(void)
             }
         }
       break;
+
+      case STATE_M_TX_XFWR:
+      default:
+      break;
     }
 
   return xNeedPoll;