--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libftmini/ft232r_magic.c	Sat Sep 09 01:06:43 2023 +0000
@@ -0,0 +1,49 @@
+/*
+ * Programming of FT232R internal EEPROM requires a special magic sequence
+ * of non-EEPROM-specific commands to be issued prior to actual EEPROM write
+ * commands.  This module implements this magic command sequence.
+ */
+
+#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 ft232r_eeprom_magic(usb_dev_handle *usbh)
+{
+	u_char buf[2];
+	int rc;
+
+	/* equivalent of ftdi_usb_reset() */
+	rc = usb_control_msg(usbh, FTDI_DEVICE_OUT_REQTYPE, SIO_RESET_REQUEST,
+			     SIO_RESET_SIO, 0, NULL, 0, USB_WRITE_TIMEOUT);
+	if (rc != 0) {
+		fprintf(stderr,
+			"ftdi_usb_reset error: usb_control_msg() returned %d\n",
+			rc);
+		exit(1);
+	}
+	/* equivalent of ftdi_poll_modem_status() */
+	rc = usb_control_msg(usbh, FTDI_DEVICE_IN_REQTYPE,
+			     SIO_POLL_MODEM_STATUS_REQUEST, 0, 0, (char *) buf,
+			     2, USB_READ_TIMEOUT);
+	if (rc != 2) {
+		fprintf(stderr,
+		"ftdi_poll_modem_status error: usb_control_msg() returned %d\n",
+			rc);
+		exit(1);
+	}
+	/* equivalent of ftdi_set_latency_timer() */
+	rc = usb_control_msg(usbh, FTDI_DEVICE_OUT_REQTYPE,
+			     SIO_SET_LATENCY_TIMER_REQUEST, 0x77, 0, NULL, 0,
+			     USB_WRITE_TIMEOUT);
+	if (rc != 0) {
+		fprintf(stderr,
+		"ftdi_set_latency_timer error: usb_control_msg() returned %d\n",
+			rc);
+		exit(1);
+	}
+}