/*
* Do wakeup on the bus
*
* We do this by noting a wakeup needs to be done for the next packet for
* fastinit, and doing slowinit now
*/
static int
diag_l0_muleng_initbus(struct diag_l0_device *dl0d, struct diag_l1_initbus_args *in)
{
int rv = 0;
struct diag_l0_muleng_device *dev;
dev = (struct diag_l0_muleng_device *)dl0d->l0_int;
if (!dev)
return diag_iseterr(DIAG_ERR_GENERAL);
if (diag_l0_debug & DIAG_DEBUG_IOCTL)
fprintf(stderr, FLFMT "device link %p info %p initbus type %d proto %d\n",
FL, (void *)dl0d, (void *)dev, in->type, dev->protocol);
diag_tty_iflush(dl0d); /* Empty the receive buffer, wait for idle bus */
if (in->type == DIAG_L1_INITBUS_5BAUD)
rv = diag_l0_muleng_slowinit(dl0d, in, dev);
else
{
/* Do wakeup on first TX */
dev->dev_wakeup = in->type;
dev->dev_state = MULENG_STATE_FASTSTART;
}
return rv;
}
/*
* Open the diagnostic device, returns a file descriptor
* records original state of term interface so we can restore later
*/
static struct diag_l0_device *
diag_l0_muleng_open(const char *subinterface, int iProtocol)
{
int rv;
struct diag_l0_device *dl0d;
struct diag_l0_muleng_device *dev;
struct diag_serial_settings set;
if (diag_l0_debug & DIAG_DEBUG_OPEN) {
fprintf(stderr, FLFMT "open subinterface %s protocol %d\n",
FL, subinterface, iProtocol);
}
diag_l0_muleng_init();
if ((rv=diag_calloc(&dev, 1)))
return diag_pseterr(rv);
dev->protocol = iProtocol;
dl0d = diag_l0_new(&diag_l0_me, (void *)dev);
if (!dl0d) {
free(dev);
return diag_pseterr(rv);
}
/* try to open TTY */
if ((rv=diag_tty_open(dl0d, subinterface))) {
diag_l0_del(dl0d);
free(dev);
return diag_pseterr(rv);
}
/* And set to 19200 baud , 8N1 */
set.speed = 19200;
set.databits = diag_databits_8;
set.stopbits = diag_stopbits_1;
set.parflag = diag_par_n;
if ((rv=diag_tty_setup(dl0d, &set))) {
diag_l0_muleng_close(dl0d);
return diag_pseterr(rv);
}
/* And set DTR high and RTS low to power the device */
if ((rv=diag_tty_control(dl0d, 1, 0))) {
diag_l0_muleng_close(dl0d);
return diag_pseterr(rv);
}
diag_tty_iflush(dl0d); /* Flush unread input */
return dl0d ;
}
/*
* Open the diagnostic device, returns a file descriptor
* records original state of term interface so we can restore later
*/
static struct diag_l0_device *
diag_l0_dumb_open(const char *subinterface, int iProtocol)
{
int rv;
struct diag_l0_device *dl0d;
struct diag_l0_dumb_device *dev;
if (diag_l0_debug & DIAG_DEBUG_OPEN) {
fprintf(stderr, FLFMT "open subinterface %s protocol %d\n",
FL, subinterface, iProtocol);
}
diag_l0_dumb_init(); //make sure it is initted
if ((rv=diag_calloc(&dev, 1)))
return diag_pseterr(DIAG_ERR_NOMEM);
dev->protocol = iProtocol;
dl0d = diag_l0_new(&diag_l0_dumb, (void *)dev);
if (!dl0d) {
free(dev);
return diag_pseterr(rv);
}
/* try to open TTY */
if ((rv=diag_tty_open(dl0d, subinterface))) {
diag_l0_del(dl0d);
free(dev);
return diag_pseterr(rv);
}
/*
* We set RTS to low, and DTR high, because this allows some
* interfaces to work than need power from the DTR/RTS lines;
* this is altered according to dumb_flags.
*/
if (diag_tty_control(dl0d, !(dumb_flags & CLEAR_DTR), (dumb_flags & SET_RTS)) < 0) {
diag_l0_dumb_close(&dl0d);
return diag_pseterr(DIAG_ERR_GENERAL);
}
if (dumb_flags & DUMBDEFAULTS)
dumb_flags = DUMBDEFAULTS & MAN_BREAK;
(void)diag_tty_iflush(dl0d); /* Flush unread input */
return dl0d;
}
/*
* Do wakeup on the bus
*
* We do this by noting a wakeup needs to be done for the next packet for
* fastinit, and doing slowinit now
*/
static int
diag_l0_br_initbus(struct diag_l0_device *dl0d, struct diag_l1_initbus_args *in)
{
int rv = 0;
struct diag_l0_br_device *dev;
dev = (struct diag_l0_br_device *)dl0d->l0_int;
if (diag_l0_debug & DIAG_DEBUG_IOCTL)
fprintf(stderr,
FLFMT "device link %p info %p initbus type %d proto %d\n",
FL, (void *)dl0d, (void *)dev, in->type,
dev ? dev->protocol : -1);
if (!dev)
return diag_iseterr(DIAG_ERR_GENERAL);
diag_tty_iflush(dl0d); /* Flush unread input */
switch (in->type)
{
case DIAG_L1_INITBUS_5BAUD:
rv = diag_l0_br_slowinit(dl0d, in);
break;
case DIAG_L1_INITBUS_FAST:
if ((dev->dev_features & BR_FEATURE_FASTINIT) == 0)
{
/* Fast init Not supported */
rv = DIAG_ERR_INIT_NOTSUPP;
}
else
{
/* Fastinit done on 1st TX */
dev->dev_state = BR_STATE_KWP_FASTINIT;
rv = 0;
}
break;
default:
rv = DIAG_ERR_INIT_NOTSUPP;
break;
}
return rv? diag_iseterr(rv):0 ;
}
/*
* Open the diagnostic device, return a file descriptor,
* record the original state of term interface so we can restore later
*/
static int br_open(struct diag_l0_device *dl0d, int iProtocol) {
struct br_device *dev = dl0d->l0_int;
int rv;
uint8_t buf[4]; /* Was MAXRBUF. We only use 1! */
struct diag_serial_settings set;
br_init();
dev->protocol = iProtocol;
dev->dev_rdoffset = 0;
dev->dev_txlen = 0;
dev->dev_framenr = 0;
dev->dev_state = BR_STATE_CLOSED;
dev->dev_features = BR_FEATURE_SETADDR;
/* try to open TTY */
dev->tty_int = diag_tty_open(dev->port.val.str);
if (dev->tty_int == NULL) {
return diag_iseterr(DIAG_ERR_GENERAL);
}
DIAG_DBGM(diag_l0_debug, DIAG_DEBUG_OPEN, DIAG_DBGLEVEL_V,
FLFMT "features 0x%X\n", FL, dev->dev_features);
/* Set serial line to 19200 baud , 8N1 */
set.speed = 19200;
set.databits = diag_databits_8;
set.stopbits = diag_stopbits_1;
set.parflag = diag_par_n;
if (diag_tty_setup(dev->tty_int, &set)) {
fprintf(stderr, FLFMT "open: TTY setup failed\n", FL);
br_close(dl0d);
return diag_iseterr(DIAG_ERR_GENERAL);
}
diag_tty_iflush(dev->tty_int); /* Flush unread input data */
/*
* Initialise the BR1 interface by sending the CHIP CONNECT
* (0x20h) command, we should get a 0xFF back
*/
buf[0] = 0x20;
if (br_write(dl0d, buf, 1)) {
DIAG_DBGM(diag_l0_debug, DIAG_DEBUG_OPEN, DIAG_DBGLEVEL_V,
FLFMT "CHIP CONNECT write failed link %p\n",
FL, (void *)dl0d);
br_close(dl0d);
return diag_iseterr(DIAG_ERR_BADIFADAPTER);
}
/* And expect 0xff as a response */
if (diag_tty_read(dev->tty_int, buf, 1, 100) != 1) {
DIAG_DBGM(diag_l0_debug, DIAG_DEBUG_OPEN, DIAG_DBGLEVEL_V,
FLFMT "CHIP CONNECT read failed link %p\n",
FL, (void *)dl0d);
br_close(dl0d);
return diag_iseterr(DIAG_ERR_BADIFADAPTER);
}
if (buf[0] != 0xff) {
DIAG_DBGM(diag_l0_debug, DIAG_DEBUG_OPEN, DIAG_DBGLEVEL_V,
FLFMT "CHIP CONNECT rcvd 0x%X != 0xff, link %p\n",
FL, buf[0], (void *)dl0d);
br_close(dl0d);
return diag_iseterr(DIAG_ERR_BADIFADAPTER);
}
/* If it's J1850, send initialisation string now */
rv = 0;
switch (iProtocol) {
case DIAG_L1_J1850_VPW:
rv = br_initialise(dl0d, 0, 0);
break;
case DIAG_L1_J1850_PWM:
rv = br_initialise(dl0d, 1, 0);
break;
case DIAG_L1_ISO9141:
case DIAG_L1_ISO14230:
/* This initialisation is done in the SLOWINIT code */
break;
}
if (rv) {
br_close(dl0d);
return diag_ifwderr(rv);
}
DIAG_DBGM(diag_l0_debug, DIAG_DEBUG_OPEN, DIAG_DBGLEVEL_V,
FLFMT "open succeeded link %p features 0x%X\n",
FL, (void *)dl0d, dev->dev_features);
dl0d->opened = 1;
return 0;
}
/*
* Open the diagnostic device, return a file descriptor,
* record the original state of term interface so we can restore later
*/
static struct diag_l0_device *
diag_l0_br_open(const char *subinterface, int iProtocol)
{
struct diag_l0_device *dl0d;
struct diag_l0_br_device *dev;
int rv;
uint8_t buf[4]; /* Was MAXRBUF. We only use 1! */
struct diag_serial_settings set;
diag_l0_br_init();
if ((rv=diag_calloc(&dev, 1)))
return diag_pseterr(rv);
dev->protocol = iProtocol;
dev->dev_rdoffset = 0;
dev->dev_txlen = 0;
dev->dev_framenr = 0;
dev->dev_state = BR_STATE_CLOSED;
dev->dev_features = BR_FEATURE_SETADDR;
/* Get an L0 link */
dl0d = diag_l0_new(&diag_l0_br, (void *)dev);
if (!dl0d) {
free(dev);
return diag_pseterr(rv);
}
/* try to open TTY */
if ((rv=diag_tty_open(dl0d, subinterface))) {
diag_l0_del(dl0d);
free(dev);
return diag_pseterr(rv);
}
if (diag_l0_debug & DIAG_DEBUG_OPEN) {
fprintf(stderr, FLFMT "features 0x%X\n", FL, dev->dev_features);
}
/* Set serial line to 19200 baud , 8N1 */
set.speed = 19200;
set.databits = diag_databits_8;
set.stopbits = diag_stopbits_1;
set.parflag = diag_par_n;
if (diag_tty_setup(dl0d, &set)) {
fprintf(stderr, FLFMT "open: TTY setup failed\n", FL);
diag_l0_br_close(&dl0d);
return diag_pseterr(rv);
}
diag_tty_iflush(dl0d); /* Flush unread input data */
/*
* Initialise the BR1 interface by sending the CHIP CONNECT
* (0x20h) command, we should get a 0xFF back
*/
buf[0] = 0x20;
if (diag_l0_br_write(dl0d, buf, 1)) {
if ((diag_l0_debug&DIAG_DEBUG_OPEN)) {
fprintf(stderr, FLFMT "CHIP CONNECT write failed link %p\n",
FL, (void *)dl0d);
}
diag_l0_br_close(&dl0d);
return diag_pseterr(DIAG_ERR_BADIFADAPTER);
}
/* And expect 0xff as a response */
if (diag_tty_read(dl0d, buf, 1, 100) != 1) {
if (diag_l0_debug & DIAG_DEBUG_OPEN) {
fprintf(stderr, FLFMT "CHIP CONNECT read failed link %p\n",
FL, (void *)dl0d);
}
diag_l0_br_close(&dl0d);
return diag_pseterr(DIAG_ERR_BADIFADAPTER);
}
if (buf[0] != 0xff) {
if (diag_l0_debug & DIAG_DEBUG_OPEN) {
fprintf(stderr, FLFMT "CHIP CONNECT rcvd 0x%X != 0xff, link %p\n",
FL, buf[0], (void *)dl0d);
}
diag_l0_br_close(&dl0d);
return diag_pseterr(DIAG_ERR_BADIFADAPTER);
}
/* If it's J1850, send initialisation string now */
rv = 0;
switch (iProtocol)
{
case DIAG_L1_J1850_VPW:
rv = diag_l0_br_initialise(dl0d, 0, 0);
break;
case DIAG_L1_J1850_PWM:
rv = diag_l0_br_initialise(dl0d, 1, 0);
break;
case DIAG_L1_ISO9141:
case DIAG_L1_ISO14230:
/* This initialisation is done in the SLOWINIT code */
break;
}
if (rv) {
diag_l0_br_close(&dl0d);
return diag_pseterr(rv);
}
if (diag_l0_debug & DIAG_DEBUG_OPEN) {
fprintf(stderr, FLFMT "open succeeded link %p features 0x%X\n",
FL, (void *)dl0d, dev->dev_features);
}
return dl0d;
}
/*
* Open the diagnostic device
* ELM settings used : no echo (E0), headers on (H1), linefeeds off (L0), mem off (M0)
*/
static struct diag_l0_device *
diag_l0_elm_open(const char *subinterface, int iProtocol)
{
int i,rv;
struct diag_l0_device *dl0d;
struct diag_l0_elm_device *dev;
struct diag_serial_settings sset;
const uint8_t *buf;
uint8_t rxbuf[ELM_BUFSIZE];
const char ** elm_official;
const char ** elm_clones; //point to elm323_ or elm327_ clone and official version string lists
if (diag_l0_debug & DIAG_DEBUG_OPEN) {
fprintf(stderr, FLFMT "open subinterface %s protocol %d\n",
FL, subinterface, iProtocol);
}
diag_l0_elm_init();
if ((rv=diag_calloc(&dev, 1)))
return diag_pseterr(rv);
dev->protocol = iProtocol;
dl0d = diag_l0_new(&diag_l0_elm, (void *)dev);
if (!dl0d) {
free(dev);
return diag_pseterr(rv);
}
/* try to open TTY */
if ((rv=diag_tty_open(dl0d, subinterface))) {
diag_l0_del(dl0d);
free(dev);
return diag_pseterr(rv);
}
//set speed to 38400;8n1.
sset.speed=38400;
sset.databits = diag_databits_8;
sset.stopbits = diag_stopbits_1;
sset.parflag = diag_par_n;
dev->serial = sset;
if ((rv=diag_tty_setup(dl0d, &sset))) {
fprintf(stderr, FLFMT "Error setting 38400;8N1 on %s\n",
FL, subinterface);
diag_l0_elm_close(&dl0d);
return diag_pseterr(rv);
}
diag_tty_iflush(dl0d); /* Flush unread input */
//At this stage, the ELM has possibly been powered up for a while;
//it may have an unfinished command / garbage in its input buffer. We
//need to clear that before sending the real ATZ ==> ATI is quick and safe; elm_purge does this.
dev->elmflags=0; //we know nothing yet
rv=elm_purge(dl0d);
//if rv=0, we got a prompt so we know speed is set properly.
if (rv==0) {
dev->elmflags |= ELM_38400;
} else {
fprintf(stderr, FLFMT "sending ATI @ 38400 failed; trying @ 9600...\n", FL);
sset.speed=9600;
dev->serial = sset;
if ((rv=diag_tty_setup(dl0d, &sset))) {
fprintf(stderr, FLFMT "Error setting 9600;8N1 on %s\n",
FL, subinterface);
diag_l0_elm_close(&dl0d);
return diag_pseterr(rv);
}
diag_tty_iflush(dl0d); /* Flush unread input */
rv = elm_purge(dl0d); //try ATI\r again
if (rv !=0) {
fprintf(stderr, FLFMT "sending ATI @ 9600 failed. Verify connection to ELM\n", FL);
diag_l0_elm_close(&dl0d);
return diag_pseterr(DIAG_ERR_BADIFADAPTER);
}
}
if (diag_l0_debug&DIAG_DEBUG_OPEN) {
fprintf(stderr, FLFMT "elm_open : sending ATZ...\n", FL);
}
//the command "ATZ" causes a full reset and the ELM replies with
//a string like "ELM32x vX.Xx\n>"
buf=(uint8_t *)"ATZ\x0D";
rv=elm_sendcmd(dl0d, buf, 4, 2000, rxbuf);
if (rv) {
fprintf(stderr, FLFMT "elm_open : ATZ failed !\n", FL);
diag_l0_elm_close(&dl0d);
return diag_pseterr(DIAG_ERR_BADIFADAPTER);
}
//Correct prompt received; try to identify device.
// 1) guess 323 vs 327
if (strstr((char *)rxbuf, "ELM323")!=NULL) {
dev->elmflags |= ELM_323_BASIC;
elm_official=elm323_official;
elm_clones=elm323_clones;
} else if (strstr((char *)rxbuf, "ELM327")!=NULL) {
dev->elmflags |= ELM_327_BASIC;
elm_official=elm327_official;
elm_clones=elm327_clones;
} else {
fprintf(stderr, FLFMT "no valid version string !! Report this !. Got:\n%s\n", FL, rxbuf);
//no point in continuing...
diag_l0_elm_close(&dl0d);
return diag_pseterr(DIAG_ERR_BADIFADAPTER);
}
// 2) identify valid VS clone devices.
rv=0; // temp "device identified" flag
for (i=0; elm_clones[i]; i++) {
if (strstr((char *)rxbuf, elm_clones[i])) {
printf("Clone ELM found, v%s\n", elm_clones[i]);
dev->elmflags |= ELM_32x_CLONE;
rv=1;
break;
}
}
if (rv==0) {
for (i=0; elm_official[i]; i++) {
if (strstr((char *)rxbuf, elm_official[i])) {
printf("Official ELM found, v%s\n", elm_official[i]);
rv=1;
break;
}
}
}
if (rv==0) {
//still not identified : assume clone.
dev->elmflags |= ELM_32x_CLONE;
printf("ELM version not recognized! Please report this ! Resp=%s\n", rxbuf);
}
if ((dev->elmflags & ELM_323_BASIC) && (dev->elmflags & ELM_32x_CLONE)) {
printf("A 323 clone ? Report this !\n");
}
if (diag_l0_debug & DIAG_DEBUG_OPEN) {
fprintf(stderr, FLFMT "ELM reset success, elmflags=%#x\n", FL, dev->elmflags);
}
//now send "ATE0\n" command to disable echo.
buf=(uint8_t *)"ATE0\x0D";
if (elm_sendcmd(dl0d, buf, 5, 500, NULL)) {
if (diag_l0_debug & DIAG_DEBUG_OPEN) {
fprintf(stderr, FLFMT "sending \"ATE0\" failed\n", FL);
}
diag_l0_elm_close(&dl0d);
return diag_pseterr(DIAG_ERR_BADIFADAPTER);
}
//ATL0 : disable linefeeds
buf=(uint8_t *)"ATL0\x0D";
if (elm_sendcmd(dl0d, buf, 5, 500, NULL)) {
if (diag_l0_debug & DIAG_DEBUG_OPEN) {
fprintf(stderr, FLFMT "sending \"ATL0\" failed\n", FL);
}
diag_l0_elm_close(&dl0d);
return diag_pseterr(DIAG_ERR_BADIFADAPTER);
}
//ATH1 : always show header bytes
buf=(uint8_t *)"ATH1\x0D";
if (elm_sendcmd(dl0d, buf, 5, 500, NULL)) {
if (diag_l0_debug & DIAG_DEBUG_OPEN) {
fprintf(stderr, FLFMT "sending \"ATH1\" failed\n", FL);
}
diag_l0_elm_close(&dl0d);
return diag_pseterr(DIAG_ERR_BADIFADAPTER);
}
//for elm327 only: disable memory
if (dev->elmflags & ELM_327_BASIC) {
buf=(uint8_t *)"ATM0\x0D";
if (elm_sendcmd(dl0d, buf, 5, 500, NULL)) {
if (diag_l0_debug & DIAG_DEBUG_OPEN) {
fprintf(stderr, FLFMT "sending \"ATM0\" failed\n", FL);
}
diag_l0_elm_close(&dl0d);
return diag_pseterr(DIAG_ERR_BADIFADAPTER);
}
}
//check if proto is really supported (323 supports only 9141 and 14230)
if ((dev->elmflags & ELM_323_BASIC) &&
((iProtocol != DIAG_L1_ISO9141) && (iProtocol != DIAG_L1_ISO14230)))
return diag_pseterr(DIAG_ERR_PROTO_NOTSUPP);
//if 327, set proto when possible; we won't if 14230, because init type (fast vs slow) isn't decided yet
// CAN is also not implemented here
buf=NULL;
if (dev->elmflags & ELM_327_BASIC) {
switch (iProtocol) {
case DIAG_L1_J1850_PWM:
buf=(uint8_t *)"ATTP1\x0D";
break;
case DIAG_L1_J1850_VPW:
buf=(uint8_t *)"ATTP2\x0D";
break;
case DIAG_L1_ISO9141:
buf=(uint8_t *)"ATTP3\x0D";
break;
default:
buf=NULL;
}
}
if (buf != NULL) {
if (elm_sendcmd(dl0d, buf, 6, 500, NULL)) {
if (diag_l0_debug & DIAG_DEBUG_OPEN) {
fprintf(stderr, FLFMT "sending \"ATTPx\" failed\n", FL);
}
diag_l0_elm_close(&dl0d);
return diag_pseterr(DIAG_ERR_BADIFADAPTER);
}
}
//at this point : ELM is ready for further ops
if (diag_l0_debug & DIAG_DEBUG_OPEN) {
fprintf(stderr, FLFMT "ELM ready.\n", FL);
}
return dl0d;
}
//Send a command to ELM device and make sure no error occured. Data is passed on directly as a string;
//caller must make sure the string is \r-terminated , i.e. 0x0D-terminated.
//Sending 0A after 0D will cause ELM to interrupt what it's doing to "process" 0A, resulting in a
//failure.
//This func should not be used for commands that elicit a data response (i.e. all data destined to the OBD bus,
//hence not prefixed by "AT"). Response is dumped in *resp (0-terminated) for optional analysis by caller; *resp must be ELM_BUFSIZE long.
//returns 0 if (prompt_good) && ("OK" found anywhere in the response) && (no known error message was present) ||
// (prompt_good && ATZ command was sent) , since response doesn't contain "OK" for ATZ.
//elm_sendcmd should not be called from outside diag_l0_elm.c.
static int
elm_sendcmd(struct diag_l0_device *dl0d, const uint8_t *data, size_t len, unsigned int timeout, uint8_t *resp)
{
//note : we better not request (len == (size_t) -1) bytes ! The casts between ssize_t and size_t are
// "muddy" in here
//ssize_t xferd;
int rv;
uint8_t ebuf[ELM_BUFSIZE]; //local buffer if caller provides none.
uint8_t *buf;
struct diag_l0_elm_device *dev;
const char *err_str; //hold a possible error message
dev = (struct diag_l0_elm_device *)dl0d->l0_int;
//we need access to diag_l0_elm_device to access .elmflags
if (resp==NULL)
buf=ebuf; //use local buffer
else
buf=resp; //or caller-provided buffer
if (!len)
return diag_iseterr(DIAG_ERR_BADLEN);
if (!dev)
return diag_iseterr(DIAG_ERR_BADFD);
if (data[len-1] != 0x0D) {
//Last byte is not a carriage return, this would die.
fprintf(stderr, FLFMT "elm_sendcmd: non-terminated command : %.*s\n", FL, (int) len, (char *) data);
//the %.*s is pure magic : limits the string length to len, even if the string is not null-terminated.
return diag_iseterr(DIAG_ERR_GENERAL);
}
diag_tty_iflush(dl0d); //currently the code often "forgets" data in the input buffer, especially if the previous
//transaction failed. Flushing the input increases the odds of not crashing soon
if (diag_l0_debug & DIAG_DEBUG_WRITE) {
fprintf(stderr, FLFMT "elm_sendcmd: %.*s\n", FL, (int) len-1, (char *)data);
}
rv = diag_tty_write(dl0d, data, len);
if (rv != (int) len) { //XXX danger ! evil cast
fprintf(stderr, FLFMT "elm_sendcmd: write error\n", FL);
return diag_iseterr(DIAG_ERR_GENERAL);
}
//next, receive ELM response, within {ms} delay.
rv=diag_tty_read(dl0d, buf, ELM_BUFSIZE-1, timeout); //rv=# bytes read
if (rv<1) {
//no data or error
if (diag_l0_debug & DIAG_DEBUG_WRITE) {
fprintf(stderr, FLFMT "ELM did not respond\n", FL);
}
return diag_iseterr(DIAG_ERR_GENERAL);
}
if (diag_l0_debug & DIAG_DEBUG_READ) {
elm_parse_cr(buf, rv); //debug output is prettier with this
fprintf(stderr, FLFMT "received %d bytes (%.*s\n); hex: ", FL, rv, rv, (char *)buf);
if (diag_l0_debug & DIAG_DEBUG_DATA) {
diag_data_dump(stderr, buf, rv);
fprintf(stderr, "\n");
}
}
buf[rv]=0; //terminate string
if (buf[rv-1] != '>') {
//if last character isn't the input prompt, there is a problem
fprintf(stderr, FLFMT "ELM not ready (no prompt received): %s\nhex: ", FL, buf);
diag_data_dump(stderr, buf, rv);
fprintf(stderr, "\n");
return diag_iseterr(DIAG_ERR_GENERAL);
}
//At this point we got a prompt but there may have been an error message.
//There is some ambiguity in the ELM datasheets on the exact format of the replies.
//1) the prompt character '>' is always alone on its line;
//2) depending on some parameters, it may be preceded by 0D or 0D 0A
//3) some errors ( "<DATA ERROR" and "<RX ERROR" ) can be appended after
//a reply; others should be at the beginning of the response (alone on a line)
//ex. of good reply : "41 00 00 \r>", bad reply :"NO DATA\r>"
//let's just use strstr() to find occurences for each known error.
//it'll take a while but speed isn't normally critical when sending commands
err_str = elm_parse_errors(dl0d, buf);
if (err_str != NULL) {
fprintf(stderr, FLFMT "ELM returned error : %s\n", FL, err_str);
return diag_iseterr(DIAG_ERR_GENERAL);
}
//check if we either 1)got a positive response "OK"
//2)were sending ATZ (special case hack, it doesn't answer "OK")
if ((strstr((char *)buf, "OK") != NULL) ||
(strstr((char *)data, "ATZ") != NULL)) {
return 0;
}
fprintf(stderr, FLFMT "Response not recognized ! Report this ! Got: \n", FL);
diag_data_dump(stderr, buf, rv);
fprintf(stderr, "\n");
return diag_iseterr(DIAG_ERR_GENERAL);
}
/*
* Do 5 Baud initialisation
*
* In the case of ISO9141 we operate in the interface's "raw" mode
* (VAG compatibility mode), in 14230 we do a slow init and send
* a tester present message
*/
static int
diag_l0_muleng_slowinit( struct diag_l0_device *dl0d, struct diag_l1_initbus_args *in,
struct diag_l0_muleng_device *dev)
{
/*
* Slow init
* Build message into send buffer, and calculate checksum
*/
uint8_t txbuf[15];
uint8_t rxbuf[15];
int rv;
unsigned int baud;
memset(txbuf, 0, sizeof(txbuf));
txbuf[0] = INTERFACE_ADDRESS;
switch (dev->protocol) {
case DIAG_L1_ISO9141:
txbuf[1] = 0x20; /* Raw mode 5 baud init */
txbuf[2] = in->addr;
break;
case DIAG_L1_ISO14230:
txbuf[1] = 0x85;
txbuf[2] = 0x01; /* One byte message */
txbuf[3] = DIAG_KW2K_SI_TP; /* tester present */
break;
}
/*
* Calculate the checksum, and send the request
*/
(void)diag_l0_muleng_txcksum(txbuf);
if ((rv = diag_l0_muleng_write(dl0d, txbuf, 15)))
return diag_iseterr(rv);
/*
* Get answer
*/
switch (dev->protocol) {
case DIAG_L1_ISO9141:
/*
* This is raw mode, we should get a single byte back
* with the timing interval, then we need to change speed
* to match that speed. Remember it takes 2 seconds to send
* the 10 bit (1+8+1) address at 5 baud
*/
rv = diag_tty_read(dl0d, rxbuf, 1, 2350);
if (rv != 1)
return diag_iseterr(DIAG_ERR_GENERAL);
if (rxbuf[0] == 0x40) {
/* Problem ..., got an error message */
diag_tty_iflush(dl0d); /* Empty the receive buffer */
return diag_iseterr(DIAG_ERR_GENERAL);
}
baud = me_baud_table[rxbuf[0]];
if (diag_l0_debug & DIAG_DEBUG_PROTO)
fprintf(stderr, FLFMT "device link %p setting baud to %u\n",
FL, (void *)dl0d, baud);
if (baud) {
struct diag_serial_settings set;
set.speed = baud;
set.databits = diag_databits_8;
set.stopbits = diag_stopbits_1;
set.parflag = diag_par_n;
/* And set the baud rate */
diag_tty_setup(dl0d, &set);
}
dev->dev_state = MULENG_STATE_RAW;
break;
case DIAG_L1_ISO14230:
/* XXX
* Should get an ack back, rather than an error response
*/
if ((rv = diag_tty_read(dl0d, rxbuf, 14, 200)) < 0)
return diag_iseterr(rv);
if (rxbuf[1] == 0x80)
return diag_iseterr(DIAG_ERR_GENERAL);
/*
* Now send the "get keybyte" request, and wait for
* response
*/
memset(txbuf, 0, sizeof(txbuf));
txbuf[0] = INTERFACE_ADDRESS;
txbuf[1] = 0x86;
(void)diag_l0_muleng_txcksum(txbuf);
rv = diag_l0_muleng_write(dl0d, txbuf, 15);
if (rv < 0)
return diag_iseterr(rv);
if ((rv = diag_tty_read(dl0d, rxbuf, 14, 200)) < 0)
return diag_iseterr(rv);
if (rxbuf[1] == 0x80) /* Error */
return diag_iseterr(rv);
/*
* Store the keybytes
*/
dev->dev_kb1 = rxbuf[2];
dev->dev_kb2 = rxbuf[3];
/*
* And tell read code to report the keybytes on first read
*/
dev->dev_state = MULENG_STATE_KWP_SENDKB1;
break;
}
return rv;
}
