Diff: CANMessage.cpp

Revision:

0:f0ce97992c5f

Child:

1:c56577ae52df

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/CANMessage.cpp	Sun Jul 15 15:15:18 2012 +0000
@@ -0,0 +1,134 @@
+/// @file CANMessage.h
+/// This is the basic CAN message, and supports construction of, formatting and decoding.
+///
+/// @version 1.0
+///
+/// @note Copyright &copr; 2011 by Smartware Computing, all rights reserved.
+///     Individuals may use this application for evaluation or non-commercial
+///     purposes. Within this restriction, changes may be made to this application
+///     as long as this copyright notice is retained. The user shall make
+///     clear that their work is a derived work, and not the original.
+///     Users of this application and sources accept this application "as is" and
+///     shall hold harmless Smartware Computing, for any undesired results while
+///     using this application - whether real or imagined.
+///
+/// @author David Smart, Smartware Computing
+///
+/// @note
+/// Version History
+/// 20110724
+/// \li Extending timestamp to 64 bits
+///
+#include <mbed.h>
+#include "CANMessage.h"
+#include "Utilities.h"      // mbed <-> Visual Studio
+
+#include "FreeRunTimer.h"
+
+static FreeRunTimer timer;
+static bool timer_on;
+
+CANmsg::CANmsg() {
+    if (!timer_on) {
+        timer.start();
+        timer_on = true;
+    }
+    timestamp = timer.read_us();
+}
+
+CANmsg::CANmsg(CANCHANNEL_T _ch, CANDIR_T _dir, CANMessage _msg) {
+    if (!timer_on) {
+        timer.start();
+        timer_on = true;
+    }
+    timestamp = timer.read_us();
+    ch = _ch;
+    dir = _dir;
+    id = _msg.id;
+    len = _msg.len;
+    for (int i=0; i<len; i++)
+        data[i] = _msg.data[i];
+    format = _msg.format;
+    type = _msg.type;
+}
+
+//        0 1   2  3        4  5---------------------| 6   7 8
+//        t xtd 02 1CF00400 08 11 22 33 44 55 66 77 88 0   0 1234.567890
+//        If the first letter is not 't'ransmit or 'r'eceive, transmit is
+//          assumed
+//        xtd 02 1CF00400 08 11 22 33 44 55 66 77 88 0   0 1234.567890
+CANmsg::CANmsg(char *p) {
+    if (!timer_on) {
+        timer.start();
+        timer_on = true;
+    }
+    ParseCANMessage(p);
+}
+
+CANmsg::~CANmsg() {
+}
+
+bool CANmsg::ParseCANMessage(char *p) {
+    //int state = 0;
+    //printf("\r\nParseCANMessage(%s)\r\n",p);
+    char *token;
+    char *search = " ,\t";  // any of these is a separator
+    token = strtok(p, search);  // might now point to 't'|'r', or 'xtd'|'nrm'
+    if (*token == 'r')
+        dir = rcv;
+    else
+        dir = xmt;
+    if (*token == 't' || *token == 'r') // transmit or receive
+        token = strtok(NULL, search);    // advance past 't'|'r'
+    if (mystrnicmp(token,"xtd",3) == 0)
+        format = CANExtended;
+    else if (mystrnicmp(token, "nrm", 3) == 0)
+        format = CANStandard;
+    token = strtok(NULL, search);
+    ch = (CANCHANNEL_T)(atoi(token) - 1);
+    token = strtok(NULL, search);
+    id = hextoul(token);
+    token = strtok(NULL, search);
+    len = hextoul(token);
+    for (int i=0; i<len; i++) {
+        token = strtok(NULL, search);
+        data[i] = (char)hextoul(token);
+    }
+    token = strtok(NULL, search);
+    // fixedZero = atoi(token)
+    token = strtok(NULL, search);
+    // lostMessages = atoi(token);
+    token = strtok(NULL, search);
+    timestamp = timer.read_us();        // set it to "now"
+    if (token)
+        timestamp = (uint32_t)(1000000 * atof(token));
+    return true;
+}
+
+void CANmsg::SetTimestamp() {
+    timestamp = (uint32_t)timer.read_us();
+}
+
+// 12345678901234567890123456789012345678901234567890123456789012345
+// r xtd 01 1CF00400 08 11 22 33 44 55 66 77 88 0    0 0012.123456
+void CANmsg::FormatCANMessage(char *buffer, int buflen) {
+    if (buflen >= 68) {    // 63+\r+\n+\0+2spare
+        sprintf(buffer, "%c %s %02d %08X %02X ",
+                (dir == xmt ) ? 't' : 'r',
+                (format == CANExtended) ? "xtd" : "nrm",
+                ch + 1,
+                id,
+                len);
+        for (int d=0; d<8; d++) {
+            if (d < len)
+                sprintf(buffer + strlen(buffer), "%02X ", data[d]);
+            else
+                strcat(buffer, "   ");
+        }
+        uint32_t uSec = timestamp % 1000000;    // integer math is faster than float
+        uint32_t Sec = timestamp / 1000000;
+        sprintf(buffer + strlen(buffer), "0   0 %04u.%06u", Sec, uSec);
+    } else {
+        strcpy(buffer,"ERROR, buf too small");
+    }
+}