Perform no-delay time synchronization

[~andy/csm213a-hw] / hw2 / messages.h

diff --git a/hw2/messages.h b/hw2/messages.h
index 20887ccb9097bfcb707a87603b100584c98a1d0b..752476fb2c4ecd60b8fd2425b72171eceb868be0 100644 (file)
--- a/hw2/messages.h
+++ b/hw2/messages.h
@@ -4,18 +4,25 @@
 
 #include <stdint.h>
 
-#define MSG_HEADER 0x1234
-#define MSG_MAXID  2
+#define MSG_HEADER       0x1234
+
+#define MSG_VALID_DEVICE 0x0001  // device id is valid
+#define MSG_VALID_WORLD  0x0002  // world time is valid
+#define MSG_VALID_START  0x0004  // start time is valid
+#define MSG_VALID_PERIOD 0x0008  // period is valid
+#define MSG_VALID_SYNC   0x8000  // begin time sync
 
 #pragma pack(1)
 
 typedef enum {
+       MSG_ID_INIT,       // Device initialization
        MSG_ID_SYNC,       // Time synchronization
        MSG_ID_EVENT,      // Event occurred
+       MSG_MAX_ID,        // Maximum message ID
 } msgid_t;
 
 typedef struct {
-       uint32_t seconds;  // Seconds since 1970 (without leap seconds)
+       uint32_t seconds;  // Seconds since 1970
        uint32_t nanosec;  // Nanoseconds since 'seconds'
 } ntime_t;
 
@@ -27,14 +34,22 @@ typedef struct {
 } header_t;
 
 typedef struct {
-       uint32_t seq;      // Current sequence counter
+       uint16_t valid;    // Message valid bits
+       uint16_t device;   // Device ID to use
+       ntime_t  world;    // World time (since 1970)
+       ntime_t  start;    // Transmit start time 
+       ntime_t  period;   // Transmit period
+} init_msg_t;
+
+typedef struct {
        ntime_t  time;     // Time of previous message
 } sync_msg_t;
 
 typedef struct {
        uint16_t device;   // Device ID
        uint16_t event;    // Event ID
-       ntime_t  time;     // Timestamp
+       ntime_t  world;    // UTC Time of event
+       ntime_t  local;    // Time since turn-on
 } event_msg_t;
 
 #pragma pack()