add modbus (not tested yet)

F1:F103/FX3U/flash.h

@@ -23,6 +23,15 @@
 #define FLASH_SIZE_REG      ((uint32_t)0x1FFFF7E0)
 #define FLASH_SIZE          *((uint16_t*)FLASH_SIZE_REG)
 
+// maximal bit number of flags
+#define MAX_FLAG_BITNO      (0)
+typedef union{
+    uint32_t u32;
+    struct{
+        uint32_t sw_send_relay_cmd; // switching ESW state will send also CMD_RELAY command with CANID_OUT
+    };
+} confflags_t;
+
 /*
  * struct to save user configurations
  */
@@ -30,10 +39,13 @@ typedef struct __attribute__((aligned(4))){
     uint16_t userconf_sz;       // "magick number"
     uint16_t CANIDin;           // CAN bus device ID for input commands
     uint16_t CANIDout;          // -//- for output signals
-    uint16_t reserved;
+    uint16_t reserved;          // added for 32-bit align
     uint32_t bouncetime;        // anti-bounce timeout (ms)
     uint32_t usartspeed;        // RS-232 speed
     uint32_t CANspeed;          // CAN bus speed
+    confflags_t flags;          // different flags
+    uint32_t modbusID;          // MODBUS-RTU ID (0 for master)
+    uint32_t modbusspeed;       // Speed of modbus interface
 } user_conf;
 
 extern user_conf the_conf;