Modified the Win32 datalink for MSTP to be more effecient by using semaphores for dataready signals. Also increased task priority. Still not fast enough - needs to respond to PFM and Token within 20ms to be compliant.

bacnet-stack/mstp.h

@@ -42,6 +42,72 @@
 #include "bacdef.h"
 #include "dlmstp.h"
 
+/*  The value 255 is used to denote broadcast when used as a */
+/* destination address but is not allowed as a value for a station. */
+/* Station addresses for master nodes can be 0-127.  */
+/* Station addresses for slave nodes can be 127-254.  */
+#define MSTP_BROADCAST_ADDRESS 255
+
+/* MS/TP Frame Type */
+/* Frame Types 8 through 127 are reserved by ASHRAE. */
+#define FRAME_TYPE_TOKEN 0
+#define FRAME_TYPE_POLL_FOR_MASTER 1
+#define FRAME_TYPE_REPLY_TO_POLL_FOR_MASTER 2
+#define FRAME_TYPE_TEST_REQUEST 3
+#define FRAME_TYPE_TEST_RESPONSE 4
+#define FRAME_TYPE_BACNET_DATA_EXPECTING_REPLY 5
+#define FRAME_TYPE_BACNET_DATA_NOT_EXPECTING_REPLY 6
+#define FRAME_TYPE_REPLY_POSTPONED 7
+/* Frame Types 128 through 255: Proprietary Frames */
+/* These frames are available to vendors as proprietary (non-BACnet) frames. */
+/* The first two octets of the Data field shall specify the unique vendor */
+/* identification code, most significant octet first, for the type of */
+/* vendor-proprietary frame to be conveyed. The length of the data portion */
+/* of a Proprietary frame shall be in the range of 2 to 501 octets. */
+#define FRAME_TYPE_PROPRIETARY_MIN 128
+#define FRAME_TYPE_PROPRIETARY_MAX 255
+/* The initial CRC16 checksum value */
+#define CRC16_INITIAL_VALUE (0xFFFF)
+
+/* receive FSM states */
+typedef enum {
+    MSTP_RECEIVE_STATE_IDLE = 0,
+    MSTP_RECEIVE_STATE_PREAMBLE = 1,
+    MSTP_RECEIVE_STATE_HEADER = 2,
+    MSTP_RECEIVE_STATE_HEADER_CRC = 3,
+    MSTP_RECEIVE_STATE_DATA = 4
+} MSTP_RECEIVE_STATE;
+
+/* master node FSM states */
+typedef enum {
+    MSTP_MASTER_STATE_INITIALIZE = 0,
+    MSTP_MASTER_STATE_IDLE = 1,
+    MSTP_MASTER_STATE_USE_TOKEN = 2,
+    MSTP_MASTER_STATE_WAIT_FOR_REPLY = 3,
+    MSTP_MASTER_STATE_DONE_WITH_TOKEN = 4,
+    MSTP_MASTER_STATE_PASS_TOKEN = 5,
+    MSTP_MASTER_STATE_NO_TOKEN = 6,
+    MSTP_MASTER_STATE_POLL_FOR_MASTER = 7,
+    MSTP_MASTER_STATE_ANSWER_DATA_REQUEST = 8
+} MSTP_MASTER_STATE;
+
+/* The time without a DataAvailable or ReceiveError event before declaration */
+/* of loss of token: 500 milliseconds. */
+#define Tno_token 500
+
+/* The minimum time without a DataAvailable or ReceiveError event */
+/* that a node must wait for a station to begin replying to a */
+/* confirmed request: 255 milliseconds. (Implementations may use */
+/* larger values for this timeout, not to exceed 300 milliseconds.) */
+#define Treply_timeout 255
+
+/* The minimum time without a DataAvailable or ReceiveError event that a */
+/* node must wait for a remote node to begin using a token or replying to */
+/* a Poll For Master frame: 20 milliseconds. (Implementations may use */
+/* larger values for this timeout, not to exceed 100 milliseconds.) */
+#define Tusage_timeout 20
+
+
 struct mstp_port_struct_t {
     MSTP_RECEIVE_STATE receive_state;
     /* When a master node is powered up or reset, */
@@ -93,7 +159,7 @@ struct mstp_port_struct_t {
     /* InputBuffer is indexed from 0 to InputBufferSize-1. */
     /* The maximum size of a frame is 501 octets. */
     /* FIXME: assign this to an actual array of bytes! */
-    /* Note: the buffer is designed as a pointer since some compilers 
+    /* Note: the buffer is designed as a pointer since some compilers
        and microcontroller architectures have limits as to places to
        hold contiguous memory. */
     uint8_t *InputBuffer;
@@ -158,12 +224,12 @@ struct mstp_port_struct_t {
     /* less than or equal to 127. If Max_Master is not writable in a node, */
     /* its value shall be 127. */
     unsigned Nmax_master;
-    
+
     /* An array of octets, used to store octets for transmitting */
     /* OutputBuffer is indexed from 0 to OutputBufferSize-1. */
     /* The maximum size of a frame is 501 octets. */
     /* FIXME: assign this to an actual array of bytes! */
-    /* Note: the buffer is designed as a pointer since some compilers 
+    /* Note: the buffer is designed as a pointer since some compilers
        and microcontroller architectures have limits as to places to
        hold contiguous memory. */
     uint8_t *OutputBuffer;