Andrew Boyson / net

A stack which works with or without an Mbed os library. Provides IPv4 or IPv6 with a full 1500 byte buffer.

Dependents:   oldheating gps motorhome heating

link/nicmac.c@94:e2973a2c488e, 2018-12-05 (annotated)

Committer:
andrewboyson
Date:
Wed Dec 05 18:30:37 2018 +0000
Revision:
94:e2973a2c488e
Parent:
61:aad055f1b0d1 
Fixed bug - incorrect MSS being sent from a polled sync: expected 1440 but had -60. Traced to buffer datalength in EthPollForPacketToSend being set to zero instead of being calculated from the buffer length - headersize.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
andrewboyson 60:1d8c7a1e7483 1 #include <stdint.h>
andrewboyson 60:1d8c7a1e7483 2 #include <stdio.h>
andrewboyson 60:1d8c7a1e7483 3 #include "log.h"
andrewboyson 60:1d8c7a1e7483 4
andrewboyson 60:1d8c7a1e7483 5 #define USR_UID 0x101
andrewboyson 60:1d8c7a1e7483 6 #define DEVICE_ID_LENGTH 32
andrewboyson 60:1d8c7a1e7483 7 #define DEVICE_MAC_OFFSET 20
andrewboyson 60:1d8c7a1e7483 8
andrewboyson 60:1d8c7a1e7483 9 void NicMac(char *mac) //Do not call this outwith of an initialisation phase - the semihost call blocks interrupts.
andrewboyson 60:1d8c7a1e7483 10 {
andrewboyson 60:1d8c7a1e7483 11 char uid[DEVICE_ID_LENGTH + 1];
andrewboyson 60:1d8c7a1e7483 12 uint32_t args[2];
andrewboyson 60:1d8c7a1e7483 13 args[0] = (uint32_t)uid;
andrewboyson 60:1d8c7a1e7483 14 args[1] = DEVICE_ID_LENGTH + 1;
andrewboyson 60:1d8c7a1e7483 15
andrewboyson 60:1d8c7a1e7483 16 __semihost(USR_UID, &args);
andrewboyson 60:1d8c7a1e7483 17
andrewboyson 60:1d8c7a1e7483 18 char *p = uid;
andrewboyson 60:1d8c7a1e7483 19 p += DEVICE_MAC_OFFSET;
andrewboyson 60:1d8c7a1e7483 20 for (int i=0; i<6; i++)
andrewboyson 60:1d8c7a1e7483 21 {
andrewboyson 60:1d8c7a1e7483 22 int byte;
andrewboyson 60:1d8c7a1e7483 23 sscanf(p, "%2x", &byte);
andrewboyson 60:1d8c7a1e7483 24 mac[i] = byte;
andrewboyson 60:1d8c7a1e7483 25 p += 2;
andrewboyson 60:1d8c7a1e7483 26 }
andrewboyson 60:1d8c7a1e7483 27 mac[0] &= ~0x01; // reset the IG bit in the address; see IEE 802.3-2002, Section 3.2.3(b)
andrewboyson 60:1d8c7a1e7483 28 }