rm fteeprom/test/fteeprom-prog-bad When the magic command sequence for FT232R was added to libftdi-based fteeprom-prog, a version without this magic sequence was preserved in fteeprom-prog-bad. However, the new minilib version of fteeprom-prog operates without this magic sequence by default (as appropriate for FT2232D, FT2232H etc) and needs to be run with -r option to invoke FT232R-specific mode with the necessary magic. Anyone who needs fteeprom-prog-bad for study or experimentation can find it in freecalypso-hwlab Hg repository where it was originally developed.

/* elementary FTDI EEPROM erase function */

#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <usb.h>
#include "ftdi_defs.h"
#include "ftdi_tune.h"
#include "eeprom_func.h"

void ftmini_erase_eeprom(usb_dev_handle *usbh)
{
	int rc;

	rc = usb_control_msg(usbh, FTDI_DEVICE_OUT_REQTYPE,
			     SIO_ERASE_EEPROM_REQUEST, 0, 0, NULL, 0,
			     USB_WRITE_TIMEOUT);
	if (rc != 0) {
		fprintf(stderr,
			"EEPROM erase error: usb_control_msg() returned %d\n",
			rc);
		exit(1);
	}
}