SR_PRIV int scanaplus_get_device_id(struct dev_context *devc)
{
int ret;
uint16_t val1, val2;
/* FTDI EEPROM indices 16+17 contain the 3 device ID bytes. */
if ((ret = ftdi_read_eeprom_location(devc->ftdic, 16, &val1)) < 0) {
sr_err("Failed to read EEPROM index 16 (%d): %s.",
ret, ftdi_get_error_string(devc->ftdic));
return SR_ERR;
}
if ((ret = ftdi_read_eeprom_location(devc->ftdic, 17, &val2)) < 0) {
sr_err("Failed to read EEPROM index 17 (%d): %s.",
ret, ftdi_get_error_string(devc->ftdic));
return SR_ERR;
}
/*
* Note: Bit 7 of the three bytes must not be used, apparently.
*
* Even though the three bits can be either 0 or 1 (we've seen both
* in actual ScanaPLUS devices), the device ID as sent to the FPGA
* has bit 7 of each byte zero'd out.
*
* It is unknown whether bit 7 of these bytes has any meaning,
* whether it's used somewhere, or whether it can be simply ignored.
*/
devc->devid[0] = ((val1 >> 0) & 0xff) & ~(1 << 7);
devc->devid[1] = ((val1 >> 8) & 0xff) & ~(1 << 7);
devc->devid[2] = ((val2 >> 0) & 0xff) & ~(1 << 7);
return SR_OK;
}
int Eeprom::read_location(int eeprom_addr, unsigned short *eeprom_val)
{
return ftdi_read_eeprom_location(d->context, eeprom_addr, eeprom_val);
}
