/*
* 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;
}
/*
* 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;
}
