I have installed the latest version of libftdi in a RPi: "libftdi 1.5 (major: 1, minor: 5, micro: 0, snapshot ver: v1.5-42-gde9f01e)"
ftdi_eeprom_get_strings() fails with a segmentation fault if the connected device does not have a serial number. ftdi_eeprom_get_strings() calls strncpy(serial, eeprom->serial, serial_len);, however if the device has no serial number, then eeprom->serial == NULL
Am I taking the wrong approach, is there a way around this without modifying libftdi?. The code I am running is as follows:
/* Based on simple.c
Simple libftdi usage example
This program is distributed under the GPL, version 2
*/
#include <stdio.h>
#include <stdlib.h>
#include <ftdi.h>
int main(void)
{
int ret;
struct ftdi_context *ftdi;
struct ftdi_version_info version;
if ((ftdi = ftdi_new()) == 0)
{
fprintf(stderr, "ftdi_new failed\n");
return EXIT_FAILURE;
}
version = ftdi_get_library_version();
printf("Initialized libftdi %s (major: %d, minor: %d, micro: %d, snapshot ver: %s)\n",
version.version_str, version.major, version.minor, version.micro,
version.snapshot_str);
if ((ret = ftdi_usb_open_desc(ftdi, 0x0403, 0x6010, "Lattice FTUSB Interface Cable", NULL)) < 0)
{
fprintf(stderr, "unable to open ftdi device: %d (%s)\n", ret, ftdi_get_error_string(ftdi));
ftdi_free(ftdi);
return EXIT_FAILURE;
}
if ((ret = ftdi_read_eeprom(ftdi)) < 0)
{
fprintf(stderr, "unable to open ftdi eeprom: %d (%s)\n", ret, ftdi_get_error_string(ftdi));
ftdi_free(ftdi);
return EXIT_FAILURE;
}
int value;
if ((ret = ftdi_get_eeprom_value(ftdi, CHIP_SIZE, &value)) < 0)
{
fprintf(stderr, "unable to get ftdi eeprom size: %d (%s)\n", ret, ftdi_get_error_string(ftdi));
ftdi_free(ftdi);
return EXIT_FAILURE;
}
if (value < 0)
{
fprintf(stderr, "No EEPROM found or EEPROM empty\n");
return EXIT_FAILURE;
}
if ((ret = ftdi_eeprom_decode(ftdi, 0)) < 0)
{
fprintf(stderr, "unable to decode ftdi eeprom: %d (%s)\n", ret, ftdi_get_error_string(ftdi));
ftdi_free(ftdi);
return EXIT_FAILURE;
}
char manufacturer[512] = "\0";
char product[512] = "\0";
char serial[512] = "\0";
struct ftdi_eeprom *eeprom = ftdi->eeprom;
if ((ret = ftdi_eeprom_get_strings(ftdi, manufacturer, sizeof(manufacturer), product, sizeof(product), serial, sizeof(serial))) < 0)
{
fprintf(stderr, "unable to get ftdi device info: %d (%s)\n", ret, ftdi_get_error_string(ftdi));
ftdi_free(ftdi);
return EXIT_FAILURE;
}
printf("manufacturer = %s, product = %s, serial = %s\n", manufacturer, product, serial);
if (ftdi->type != TYPE_2232H)
{
fprintf(stderr, "Expected a FT2232H\n");
}
if ((ret = ftdi_usb_close(ftdi)) < 0)
{
fprintf(stderr, "unable to close ftdi device: %d (%s)\n", ret, ftdi_get_error_string(ftdi));
ftdi_free(ftdi);
return EXIT_FAILURE;
}
ftdi_free(ftdi);
return EXIT_SUCCESS;
}
