view libftmini/eeprom_rd.c @ 23:7e6dcceb5ee8

fteeprom-prog: implement -r option for FT232R mode
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 09 Sep 2023 07:05:51 +0000
parents 67ecb394b24f
children
line wrap: on
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/* elementary FTDI EEPROM read 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"

u_short ftmini_read_eeprom_loc(usb_dev_handle *usbh, u_short addr)
{
	u_char buf[2];
	int rc;

	rc = usb_control_msg(usbh, FTDI_DEVICE_IN_REQTYPE,
			     SIO_READ_EEPROM_REQUEST, 0, addr, (char *) buf, 2,
			     USB_READ_TIMEOUT);
	if (rc != 2) {
		fprintf(stderr,
			"EEPROM read error: usb_control_msg() returned %d\n",
			rc);
		exit(1);
	}
	return buf[0] | (buf[1] << 8);
}