/*
* Insert the L3 layer on top of the layer 2 connection
*
*/
static int
diag_l3_vag_start(struct diag_l3_conn *d_l3_conn) {
struct diag_l2_data l2data;
struct diag_l2_conn *d_l2_conn;
/* 5 baud init has been done, make sure we got the correct keybytes */
d_l2_conn = d_l3_conn->d_l3l2_conn;
(void)diag_l2_ioctl(d_l2_conn, DIAG_IOCTL_GET_L2_DATA, (void *)&l2data);
DIAG_DBGM(diag_l3_debug, DIAG_DEBUG_INIT, DIAG_DBGLEVEL_V,
FLFMT "start L3 KB 0x%X 0x%X need 0x01 0x8A\n",
FL, l2data.kb1, l2data.kb2);
if (l2data.kb1 != 0x01) {
return diag_iseterr(DIAG_ERR_WRONGKB);
}
if (l2data.kb2 != 0x8A) {
return diag_iseterr(DIAG_ERR_WRONGKB);
}
/* OK, ISO 9141 keybytes are correct ! */
/* Get the initial stuff the ECU tells us */
return 0;
}
int
diag_l2_proto_raw_startcomms( struct diag_l2_conn *d_l2_conn,
UNUSED(flag_type flags),
unsigned int bitrate,
target_type target,
source_type source)
{
int rv;
struct diag_serial_settings set;
set.speed = bitrate;
set.databits = diag_databits_8;
set.stopbits = diag_stopbits_1;
set.parflag = diag_par_n;
/* Set the speed as shown */
rv=diag_l2_ioctl(d_l2_conn, DIAG_IOCTL_SETSPEED, &set);
if (!rv)
return diag_iseterr(DIAG_ERR_GENERAL);
//set tgt and src address in d_l2_conn
d_l2_conn->diag_l2_destaddr=target;
d_l2_conn->diag_l2_srcaddr=source;
return 0;
}
// diag_l3_ioctl : call the diag_l3_proto_ioctl AND diag_l2_ioctl !?
// But why L2 ?
int diag_l3_ioctl(struct diag_l3_conn *d_l3_conn, unsigned int cmd, void *data)
{
int rv = 0;
const struct diag_l3_proto *dp = d_l3_conn->d_l3_proto;
/* Call the L3 ioctl routine */
if (dp->diag_l3_proto_ioctl)
rv = dp->diag_l3_proto_ioctl(d_l3_conn, cmd, data);
if (rv < 0)
return rv;
/* And now the L2 ioctl routine, which will call the L1 one etc */
rv = diag_l2_ioctl(d_l3_conn->d_l3l2_conn, cmd, data);
return rv;
}
/*
* Protocol start (connect a protocol on top of a L2 connection)
* make sure to diag_l3_stop afterwards to free() the diag_l3_conn !
* This adds the new l3 connection to the diag_l3_list linked-list
*/
struct diag_l3_conn *
diag_l3_start(const char *protocol, struct diag_l2_conn *d_l2_conn)
{
struct diag_l3_conn *d_l3_conn = NULL;
unsigned int i;
int rv;
const struct diag_l3_proto *dp;
assert(d_l2_conn != NULL);
if (diag_l3_debug & DIAG_DEBUG_OPEN)
fprintf(stderr,FLFMT "start protocol %s l2 %p\n",
FL, protocol, (void *)d_l2_conn);
/* Find the protocol */
dp = NULL;
for (i=0; diag_l3_protocols[i]; i++) {
if (strcasecmp(protocol, diag_l3_protocols[i]->proto_name) == 0)
{
dp = diag_l3_protocols[i]; /* Found. */
break;
}
}
if (dp)
{
if (diag_l3_debug & DIAG_DEBUG_OPEN)
fprintf(stderr,FLFMT "start protocol %s found\n",
FL, dp->proto_name);
/*
* Malloc us a L3
*/
if (diag_calloc(&d_l3_conn, 1))
return diag_pseterr(DIAG_ERR_NOMEM);
d_l3_conn->d_l3l2_conn = d_l2_conn;
d_l3_conn->d_l3_proto = dp;
/* Get L2 flags */
(void)diag_l2_ioctl(d_l2_conn,
DIAG_IOCTL_GET_L2_FLAGS,
&d_l3_conn->d_l3l2_flags);
/* Get L1 flags */
(void)diag_l2_ioctl(d_l2_conn,
DIAG_IOCTL_GET_L1_FLAGS,
&d_l3_conn->d_l3l1_flags);
/* Call the proto routine */
rv = dp->diag_l3_proto_start(d_l3_conn);
if (rv < 0) {
free(d_l3_conn);
return diag_pseterr(rv);
} else {
/*
* Set time to now
*/
d_l3_conn->timer=diag_os_getms();
/*
* And add to list
*/
LL_PREPEND(diag_l3_list, d_l3_conn);
}
}
if (diag_l3_debug & DIAG_DEBUG_OPEN)
fprintf(stderr,FLFMT "start returns %p\n",
FL, (void *)d_l3_conn);
return d_l3_conn;
}
/*
* The complex initialisation routine for ISO14230, which supports
* 2 types of initialisation (5-BAUD, FAST) and functional
* and physical addressing. The ISO14230 spec describes CARB initialisation
* which is done in the ISO9141 code
*
* Remember, we have to wait longer on smart L1 interfaces.
*/
static int
diag_l2_proto_14230_startcomms( struct diag_l2_conn *d_l2_conn, flag_type flags,
unsigned int bitrate, target_type target, source_type source)
{
struct diag_l2_14230 *dp;
struct diag_msg msg={0};
uint8_t data[MAXRBUF];
int rv;
unsigned int wait_time;
uint8_t cbuf[MAXRBUF];
unsigned int timeout;
struct diag_serial_settings set;
struct diag_l1_initbus_args in;
if (diag_calloc(&dp, 1))
return diag_iseterr(DIAG_ERR_NOMEM);
d_l2_conn->diag_l2_proto_data = (void *)dp;
dp->initype = flags & DIAG_L2_TYPE_INITMASK; //only keep initmode flags
dp->srcaddr = source;
dp->dstaddr = target;
//set iso14230-specific flags according to what we were given
if (flags & DIAG_L2_IDLE_J1978)
dp->modeflags |= ISO14230_IDLE_J1978;
if (flags & DIAG_L2_TYPE_FUNCADDR)
dp->modeflags |= ISO14230_FUNCADDR;
dp->first_frame = 1;
if (diag_l2_debug & DIAG_DEBUG_PROTO)
fprintf(stderr, FLFMT "_startcomms flags=0x%X tgt=0x%X src=0x%X\n",
FL, flags, target, source);
memset(data, 0, sizeof(data));
/*
* If 0 has been specified, use the correct speed
* for ISO14230 protocol
*/
if (bitrate == 0)
bitrate = 10400;
d_l2_conn->diag_l2_speed = bitrate;
set.speed = bitrate;
set.databits = diag_databits_8;
set.stopbits = diag_stopbits_1;
set.parflag = diag_par_n;
/* Set the speed*/
if ((rv=diag_l2_ioctl(d_l2_conn, DIAG_IOCTL_SETSPEED, (void *) &set))) {
free(dp);
d_l2_conn->diag_l2_proto_data=NULL; //delete pointer to dp
return diag_iseterr(rv);
}
dp->state = STATE_CONNECTING ;
/* Flush unread input, then wait for idle bus. */
(void)diag_l2_ioctl(d_l2_conn, DIAG_IOCTL_IFLUSH, NULL);
diag_os_millisleep(300);
//inside this switch, we set rv=0 or rv=error before "break;"
switch (dp->initype & DIAG_L2_TYPE_INITMASK) {
/* Fast initialisation */
case DIAG_L2_TYPE_FASTINIT:
/* Build an ISO14230 StartComms message */
if (flags & DIAG_L2_TYPE_FUNCADDR) {
msg.fmt = DIAG_FMT_ISO_FUNCADDR;
d_l2_conn->diag_l2_physaddr = 0; /* Don't know it yet */
in.physaddr = 0;
} else {
msg.fmt = 0;
d_l2_conn->diag_l2_physaddr = target;
in.physaddr = 1;
}
msg.src = source;
msg.dest = target;
msg.len = 1 ;
data[0]= DIAG_KW2K_SI_SCR ; /* startCommunication rqst*/
msg.data = data;
/* Do fast init stuff */
in.type = DIAG_L1_INITBUS_FAST;
in.addr = target;
in.testerid = source;
rv = diag_l2_ioctl(d_l2_conn, DIAG_IOCTL_INITBUS, &in);
// some L0 devices already do the full startcomm transaction:
if ((d_l2_conn->diag_link->l1flags & DIAG_L1_DOESFULLINIT) && (rv==0)) {
//TODO : somehow extract keybyte data for those cases...
//original elm327s have the "atkw" command to get the keybytes, but clones suck.
dp->state = STATE_ESTABLISHED;
break;
}
if (rv < 0)
break;
/* Send the prepared message */
if (diag_l2_proto_14230_send(d_l2_conn, &msg)) {
rv=DIAG_ERR_GENERAL;
break;
}
if (d_l2_conn->diag_link->l1flags & DIAG_L1_DOESL2FRAME)
timeout = 200;
else
timeout = d_l2_conn->diag_l2_p2max + RXTOFFSET;
/* And wait for a response, ISO14230 says will arrive in P2 */
rv = diag_l2_proto_14230_int_recv(d_l2_conn, timeout);
if (rv < 0)
break;
// _int_recv() should have filled d_l2_conn->diag_msg properly.
// check if message is OK :
if (d_l2_conn->diag_msg->fmt & DIAG_FMT_BADCS) {
rv=DIAG_ERR_BADCSUM;
break;
}
switch (d_l2_conn->diag_msg->data[0]) {
case DIAG_KW2K_RC_SCRPR: /* StartComms positive response */
d_l2_conn->diag_l2_kb1 = d_l2_conn->diag_msg->data[1];
d_l2_conn->diag_l2_kb2 = d_l2_conn->diag_msg->data[2];
d_l2_conn->diag_l2_physaddr = d_l2_conn->diag_msg->src;
if (diag_l2_debug & DIAG_DEBUG_PROTO) {
fprintf(stderr,
FLFMT "_StartComms Physaddr=0x%X KB1=%02X, KB2=%02X\n",
FL, d_l2_conn->diag_l2_physaddr, d_l2_conn->diag_l2_kb1, d_l2_conn->diag_l2_kb2);
}
rv=0;
dp->state = STATE_ESTABLISHED ;
break;
case DIAG_KW2K_RC_NR:
if (diag_l2_debug & DIAG_DEBUG_PROTO) {
fprintf(stderr,
FLFMT "_StartComms got neg response\n", FL);
}
rv=DIAG_ERR_ECUSAIDNO;
break;
default:
if (diag_l2_debug & DIAG_DEBUG_PROTO) {
fprintf(stderr,
FLFMT "_StartComms got unexpected response 0x%X\n",
FL, d_l2_conn->diag_msg->data[0]);
}
rv=DIAG_ERR_ECUSAIDNO;
break;
} //switch data[0]
break; //case _FASTINIT
/* 5 Baud init */
case DIAG_L2_TYPE_SLOWINIT:
in.type = DIAG_L1_INITBUS_5BAUD;
in.addr = target;
rv = diag_l2_ioctl(d_l2_conn, DIAG_IOCTL_INITBUS, &in);
//some L0 devices handle the full init transaction:
if ((d_l2_conn->diag_link->l1flags & DIAG_L1_DOESFULLINIT) && (rv==0)) {
dp->state = STATE_ESTABLISHED ;
break;
}
if (rv < 0)
break;
/* Mode bytes are in 7-Odd-1, read as 8N1 and ignore parity */
rv = diag_l1_recv (d_l2_conn->diag_link->diag_l2_dl0d, 0,
cbuf, 2, 100);
if (rv < 0)
break;
/* ISO14230 uses KB2 of 0x8F */
if (cbuf[1] != 0x8f) {
rv=DIAG_ERR_WRONGKB;
break;
}
/* Note down the mode bytes */
// KB1 : we eliminate the Parity bit (MSB !)
d_l2_conn->diag_l2_kb1 = cbuf[0] & 0x7f;
d_l2_conn->diag_l2_kb2 = cbuf[1];
if ( (d_l2_conn->diag_link->l1flags
& DIAG_L1_DOESSLOWINIT) == 0) {
/*
* Now transmit KB2 inverted
*/
cbuf[0] = ~ d_l2_conn->diag_l2_kb2;
rv = diag_l1_send (d_l2_conn->diag_link->diag_l2_dl0d, 0,
cbuf, 1, d_l2_conn->diag_l2_p4min);
/*
* And wait for the address byte inverted
*/
//first init cbuf[0] to the wrong value in case l1_recv gets nothing
cbuf[0]= (uint8_t) target;
rv = diag_l1_recv (d_l2_conn->diag_link->diag_l2_dl0d, 0,
cbuf, 1, 350);
if (cbuf[0] != ((~target) & 0xFF) ) {
fprintf(stderr, FLFMT "_startcomms : addr mismatch %02X!=%02X\n",
FL, cbuf[0], (uint8_t) ~target);
rv=DIAG_ERR_WRONGKB;
break;
}
if (diag_l2_debug & DIAG_DEBUG_INIT)
fprintf(stderr, FLFMT "ISO14230 KB1=%02X KB2=%02X\n", FL,
d_l2_conn->diag_l2_kb1, d_l2_conn->diag_l2_kb2);
}
rv=0;
dp->state = STATE_ESTABLISHED ;
break; //case _SLOWINIT
case DIAG_L2_TYPE_MONINIT:
/* Monitor mode, don't send anything */
dp->state = STATE_ESTABLISHED ;
rv = 0;
break;
default:
rv = DIAG_ERR_INIT_NOTSUPP;
break;
} //end of switch dp->initype
//At this point we just finished the handshake and got KB1 and KB2
if (rv < 0) {
free(dp);
d_l2_conn->diag_l2_proto_data=NULL; //delete pointer to dp
return diag_iseterr(rv);
}
// Analyze keybytes and set modeflags properly. See
// iso14230 5.2.4.1 & Table 8
dp->modeflags |= ((d_l2_conn->diag_l2_kb1 & 1)? ISO14230_FMTLEN:0) |
((d_l2_conn->diag_l2_kb1 & 2)? ISO14230_LENBYTE:0) |
((d_l2_conn->diag_l2_kb1 & 4)? ISO14230_SHORTHDR:0) |
((d_l2_conn->diag_l2_kb1 & 8)? ISO14230_LONGHDR:0);
if (diag_l2_debug & DIAG_DEBUG_PROTO)
fprintf(stderr, FLFMT "new modeflags=0x%04X\n", FL, dp->modeflags);
//For now, we won't bother with Normal / Extended timings. We don't
//need to unless we use the AccessTimingParameters service (scary)
/*
* Now, we want to remove any rubbish left
* in inbound buffers, and wait for the bus to be
* quiet for a while before we will communicate
* (so that the next byte received is the first byte
* of an iso14230 frame, not a middle byte)
* We use 1/2 of P2max (inter response gap) or
* 5 * p4max (inter byte delay), whichever is larger
* a correct value to use
*/
wait_time = d_l2_conn->diag_l2_p2max / 2 ;
if ((d_l2_conn->diag_l2_p4max * 5) > wait_time)
wait_time = d_l2_conn->diag_l2_p4max * 5;
while ( diag_l1_recv (d_l2_conn->diag_link->diag_l2_dl0d, 0,
data, sizeof(data), wait_time) != DIAG_ERR_TIMEOUT) ;
/* And we're done */
dp->state = STATE_ESTABLISHED ;
return 0;
}
static int
diag_l2_proto_vag_startcomms( struct diag_l2_conn *d_l2_conn,
UNUSED(flag_type flags),
unsigned int bitrate, target_type target, UNUSED(source_type source))
{
struct diag_serial_settings set;
struct diag_l2_vag *dp;
uint8_t data[MAXRBUF];
int rv;
/* int wait_time;*/
/* int hdrlen;*/
/* int datalen;*/
/* int datasrc;*/
uint8_t cbuf[MAXRBUF];
/* int len;*/
struct diag_l1_initbus_args in;
if (diag_calloc(&dp, 1))
return diag_iseterr(DIAG_ERR_NOMEM);
d_l2_conn->diag_l2_proto_data = (void *)dp;
memset(data, 0, sizeof(data));
/*
* If 0 has been specified, use a useful default of 9600
*/
if (bitrate == 0)
bitrate = 9600;
d_l2_conn->diag_l2_speed = bitrate;
set.speed = bitrate;
set.databits = diag_databits_8;
set.stopbits = diag_stopbits_1;
set.parflag = diag_par_n;
/* Set the speed as shown */
rv = diag_l2_ioctl(d_l2_conn, DIAG_IOCTL_SETSPEED, &set);
if (rv < 0)
{
free(dp);
d_l2_conn->diag_l2_proto_data=NULL;
return diag_iseterr(rv);
}
/* Flush unread input, then wait for idle bus. */
(void)diag_l2_ioctl(d_l2_conn, DIAG_IOCTL_IFLUSH, NULL);
diag_os_millisleep(300);
/* Now do 5 baud init of supplied address */
in.type = DIAG_L1_INITBUS_5BAUD;
in.addr = target;
rv = diag_l2_ioctl(d_l2_conn, DIAG_IOCTL_INITBUS, &in);
if (rv < 0) {
free(dp);
d_l2_conn->diag_l2_proto_data=NULL;
return rv;
}
/* Mode bytes are in 7-Odd-1, read as 8N1 and ignore parity */
rv = diag_l1_recv (d_l2_conn->diag_link->diag_l2_dl0d, 0,
cbuf, 1, 100);
if (rv < 0) {
free(dp);
d_l2_conn->diag_l2_proto_data=NULL;
return diag_iseterr(rv);
}
rv = diag_l1_recv (d_l2_conn->diag_link->diag_l2_dl0d, 0,
&cbuf[1], 1, 100);
if (rv < 0) {
free(dp);
d_l2_conn->diag_l2_proto_data=NULL;
return diag_iseterr(rv);
}
/* Keybytes are 0x1 0x8a for VAG protocol */
if ((cbuf[0] != 0x01) || (cbuf[1] != 0x8a)) {
free(dp);
d_l2_conn->diag_l2_proto_data=NULL;
return diag_iseterr(DIAG_ERR_WRONGKB);
}
/* Note down the mode bytes */
d_l2_conn->diag_l2_kb1 = cbuf[0] & 0x7f;
d_l2_conn->diag_l2_kb2 = cbuf[1] & 0x7f;
if ( (d_l2_conn->diag_link->l1flags
& DIAG_L1_DOESSLOWINIT) == 0)
{
/*
* Now transmit KB2 inverted
*/
cbuf[0] = ~ d_l2_conn->diag_l2_kb2;
rv = diag_l1_send (d_l2_conn->diag_link->diag_l2_dl0d, 0,
cbuf, 1, d_l2_conn->diag_l2_p4min);
}
/*
* Now receive the first 3 messages
* which show ECU versions etc
*/
return 0;
}
