Hello,
I try to scan every 5 seconds the usb bus for ftdi 2232 devices, to add
or remove them from my list. And It works, but when I connect to devices
I found and try again to look for 2232 devices
I get an "segmentation fault" at ftdi_init.
This is the code for that. At the first time this works, but If i have a
connection to ftdi devices on bus it doesn't.
And I don't know why? Does someone else know why?
int scan_usb_heliosens()
{
int num_devices = 0;
struct ftdi_context ftdic;
struct ftdi_device_list *devlist, *curdev;
struct heliosens_usb *temp, *temp2;
char tempmanu[128], tempdesc[128], tempserial[50];
if(ftdi_init(&ftdic) < 0) {
fprintf(stderr, "ftdi_init failed\n");
return -1;
}
//USB Heliosens devices use all a FT2232 (VID=0x0403, PID=0x6010)
if((num_devices = ftdi_usb_find_all(&ftdic, &devlist, 0x0403, 0x6010))
< 0) {
fprintf(stderr, "ftdi_usb_find_all failed: %d (%s)\n", num_devices,
ftdi_get_error_string(&ftdic));
goto return_error;
}
if(num_devices > 0) {
for (curdev = devlist; curdev != NULL; curdev = curdev->next) {
if (ftdi_usb_get_strings(&ftdic, curdev->dev, tempmanu,
sizeof(tempmanu)-1, tempdesc, sizeof(tempdesc)-1, tempserial,
sizeof(tempserial)-1) < 0) {
fprintf(stderr, "ftdi_usb_get_strings failed: (%s)\n",
ftdi_get_error_string(&ftdic));
goto return_error;
}
if(verbose) {
fprintf(stdout, "Found Device Manufacturer: %s\tDescription:
%s\n", tempmanu, tempdesc);
}
// Check if ftdi devices is a usb heliosens
if(strncmp(MANUFACTURER,tempmanu, sizeof(tempmanu)-1)==0 &&
strncmp(DESCRIPTION,tempdesc, sizeof(tempdesc)-1)==0) {
// Check if device is always known
int device_known = FALSE;
temp = devices;
while(temp != NULL) {
if( strncmp(temp->ident, tempserial, sizeof(tempserial)-1) == 0)
device_known = TRUE;
temp = temp->next;
}
if(device_known)
continue;
//Try to allocate ftdi_context's for found heliosens
struct heliosens_usb *newdev;
if((newdev = (struct heliosens_usb *)malloc(sizeof(struct
ftdi_context))) == NULL) {
fprintf(stderr, "Can not allocate memory for ftdi device\n");
goto return_error;
}
// init the ftdi_context structure
if(ftdi_init(&newdev->ftdic) < 0) {
fprintf(stderr, "Can not init ftid_context\n");
free(newdev);
continue;
}
// Now let open and initialise this devices
if(open_and_initialise_mpsse(&newdev->ftdic, curdev) < 0) {
fprintf(stderr, "Can not open and initialise device\n" );
close_and_free(newdev);
continue;
}
// Calibrate and configure device if needed
if(calibrate)
run_calibrate(&newdev->ftdic);
else if(conversion_mode != CONVERSION_MODE_4) //Mode 4 is
reset value of the HCPL-0872
set_config(&newdev->ftdic);
// Add struct heliosens_usb (newdev) to list
temp = devices;
fprintf(stderr, "ident: %s | tempserial: %s\n", newdev->ident,
tempserial);
strncpy(newdev->ident, tempserial, sizeof(newdev->ident)-1);
if(temp == NULL) { // add as first entry
newdev->prev = NULL;
newdev->next = NULL;
temp = newdev;
devices = temp;
}
else { // add entry to end
for(; temp->next != NULL; temp = temp->next);
temp->next = newdev;
newdev->prev = temp;
newdev->next = NULL;
}
if(verbose)
fprintf(stdout, "Device %s added\n", newdev->ident);
}
}
}
// Check if all devices in list are really available
unsigned short status;
temp = devices;
while(temp != NULL) {
temp2 = temp;
temp = temp->next;
if(ftdi_poll_modem_status(&temp2->ftdic, &status) < 0 ) {
if(verbose)
fprintf(stderr, "Removing device %s\n", temp2->ident);
// Let's remove device from list
if(temp2->prev == NULL && temp2->next == NULL) { //only one entry
devices = NULL;
}
if(temp2->prev == NULL) { //first entry
temp2->next->prev = NULL;
}
else if(temp2->next == NULL) { //last entry
temp2->prev->next = NULL;
}
else {
temp2->prev->next = temp2->next;
temp2->next->prev = temp2->prev;
}
close_and_free(temp2);
}
}
if(num_devices > 0)
ftdi_list_free(&devlist);
ftdi_deinit(&ftdic);
return 1;
return_error:
ftdi_deinit(&ftdic);
return -1;
}
Regards
Lars
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