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icestorm/iceprog/iceprog.c

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/*
* iceprog -- simple programming tool for FTDI-based Lattice iCE programmers
*
* Copyright (C) 2015 Clifford Wolf <clifford@clifford.at>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Relevant Documents:
* -------------------
* http://www.latticesemi.com/~/media/Documents/UserManuals/EI/icestickusermanual.pdf
* http://www.micron.com/~/media/documents/products/data-sheet/nor-flash/serial-nor/n25q/n25q_32mb_3v_65nm.pdf
* http://www.ftdichip.com/Support/Documents/AppNotes/AN_108_Command_Processor_for_MPSSE_and_MCU_Host_Bus_Emulation_Modes.pdf
*/
#define _GNU_SOURCE
#include <ftdi.h>
#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <getopt.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
static struct ftdi_context ftdic;
static bool ftdic_open = false;
static bool verbose = false;
static bool ftdic_latency_set = false;
static unsigned char ftdi_latency;
static void check_rx()
{
while (1) {
uint8_t data;
int rc = ftdi_read_data(&ftdic, &data, 1);
if (rc <= 0)
break;
fprintf(stderr, "unexpected rx byte: %02X\n", data);
}
}
static void error(int status)
{
check_rx();
fprintf(stderr, "ABORT.\n");
if (ftdic_open) {
if (ftdic_latency_set)
ftdi_set_latency_timer(&ftdic, ftdi_latency);
ftdi_usb_close(&ftdic);
}
ftdi_deinit(&ftdic);
exit(status);
}
static uint8_t recv_byte()
{
uint8_t data;
while (1) {
int rc = ftdi_read_data(&ftdic, &data, 1);
if (rc < 0) {
fprintf(stderr, "Read error.\n");
error(2);
}
if (rc == 1)
break;
usleep(100);
}
return data;
}
static void send_byte(uint8_t data)
{
int rc = ftdi_write_data(&ftdic, &data, 1);
if (rc != 1) {
fprintf(stderr, "Write error (single byte, rc=%d, expected %d).\n", rc, 1);
error(2);
}
}
static void send_spi(uint8_t *data, int n)
{
if (n < 1)
return;
send_byte(0x11);
send_byte(n - 1);
send_byte((n - 1) >> 8);
int rc = ftdi_write_data(&ftdic, data, n);
if (rc != n) {
fprintf(stderr, "Write error (chunk, rc=%d, expected %d).\n", rc, n);
error(2);
}
}
static void xfer_spi(uint8_t *data, int n)
{
if (n < 1)
return;
send_byte(0x31);
send_byte(n - 1);
send_byte((n - 1) >> 8);
int rc = ftdi_write_data(&ftdic, data, n);
if (rc != n) {
fprintf(stderr, "Write error (chunk, rc=%d, expected %d).\n", rc, n);
error(2);
}
for (int i = 0; i < n; i++)
data[i] = recv_byte();
}
static void set_gpio(int slavesel_b, int creset_b)
{
uint8_t gpio = 1;
if (slavesel_b) {
// ADBUS4 (GPIOL0)
gpio |= 0x10;
}
if (creset_b) {
// ADBUS7 (GPIOL3)
gpio |= 0x80;
}
send_byte(0x80);
send_byte(gpio);
send_byte(0x93);
}
static int get_cdone()
{
uint8_t data;
send_byte(0x81);
data = recv_byte();
// ADBUS6 (GPIOL2)
return (data & 0x40) != 0;
}
static void flash_read_id()
{
// fprintf(stderr, "read flash ID..\n");
uint8_t data[21] = { 0x9F };
set_gpio(0, 0);
xfer_spi(data, 21);
set_gpio(1, 0);
fprintf(stderr, "flash ID:");
for (int i = 1; i < 21; i++)
fprintf(stderr, " 0x%02X", data[i]);
fprintf(stderr, "\n");
}
static void flash_power_up()
{
uint8_t data[1] = { 0xAB };
set_gpio(0, 0);
xfer_spi(data, 1);
set_gpio(1, 0);
}
static void flash_power_down()
{
uint8_t data[1] = { 0xB9 };
set_gpio(0, 0);
xfer_spi(data, 1);
set_gpio(1, 0);
}
static void flash_write_enable()
{
if (verbose)
fprintf(stderr, "write enable..\n");
uint8_t data[1] = { 0x06 };
set_gpio(0, 0);
xfer_spi(data, 1);
set_gpio(1, 0);
}
static void flash_bulk_erase()
{
fprintf(stderr, "bulk erase..\n");
uint8_t data[1] = { 0xc7 };
set_gpio(0, 0);
xfer_spi(data, 1);
set_gpio(1, 0);
}
static void flash_64kB_sector_erase(int addr)
{
fprintf(stderr, "erase 64kB sector at 0x%06X..\n", addr);
uint8_t command[4] = { 0xd8, (uint8_t)(addr >> 16), (uint8_t)(addr >> 8), (uint8_t)addr };
set_gpio(0, 0);
send_spi(command, 4);
set_gpio(1, 0);
}
static void flash_prog(int addr, uint8_t *data, int n)
{
if (verbose)
fprintf(stderr, "prog 0x%06X +0x%03X..\n", addr, n);
uint8_t command[4] = { 0x02, (uint8_t)(addr >> 16), (uint8_t)(addr >> 8), (uint8_t)addr };
set_gpio(0, 0);
send_spi(command, 4);
send_spi(data, n);
set_gpio(1, 0);
if (verbose)
for (int i = 0; i < n; i++)
fprintf(stderr, "%02x%c", data[i], i == n - 1 || i % 32 == 31 ? '\n' : ' ');
}
static void flash_read(int addr, uint8_t *data, int n)
{
if (verbose)
fprintf(stderr, "read 0x%06X +0x%03X..\n", addr, n);
uint8_t command[4] = { 0x03, (uint8_t)(addr >> 16), (uint8_t)(addr >> 8), (uint8_t)addr };
set_gpio(0, 0);
send_spi(command, 4);
memset(data, 0, n);
xfer_spi(data, n);
set_gpio(1, 0);
if (verbose)
for (int i = 0; i < n; i++)
fprintf(stderr, "%02x%c", data[i], i == n - 1 || i % 32 == 31 ? '\n' : ' ');
}
static void flash_wait()
{
if (verbose)
fprintf(stderr, "waiting..");
while (1)
{
uint8_t data[2] = { 0x05 };
set_gpio(0, 0);
xfer_spi(data, 2);
set_gpio(1, 0);
if ((data[1] & 0x01) == 0)
break;
if (verbose) {
fprintf(stderr, ".");
fflush(stdout);
}
usleep(1000);
}
if (verbose)
fprintf(stderr, "\n");
}
static void help(const char *progname)
{
fprintf(stderr, "Simple programming tool for FTDI-based Lattice iCE programmers.\n");
fprintf(stderr, "Usage: %s [-b|-n|-c] <input file>\n", progname);
fprintf(stderr, " %s -r|-R<bytes> <output file>\n", progname);
fprintf(stderr, " %s -S <input file>\n", progname);
fprintf(stderr, " %s -t\n", progname);
fprintf(stderr, "\n");
fprintf(stderr, "General options:\n");
fprintf(stderr, " -d <device string> use the specified USB device [default: i:0x0403:0x6010]\n");
fprintf(stderr, " d:<devicenode> (e.g. d:002/005)\n");
fprintf(stderr, " i:<vendor>:<product> (e.g. i:0x0403:0x6010)\n");
fprintf(stderr, " i:<vendor>:<product>:<index> (e.g. i:0x0403:0x6010:0)\n");
fprintf(stderr, " s:<vendor>:<product>:<serial-string>\n");
fprintf(stderr, " -I [ABCD] connect to the specified interface on the FTDI chip\n");
fprintf(stderr, " [default: A]\n");
fprintf(stderr, " -o <offset in bytes> start address for read/write [default: 0]\n");
fprintf(stderr, " (append 'k' to the argument for size in kilobytes,\n");
fprintf(stderr, " or 'M' for size in megabytes)\n");
fprintf(stderr, " -v verbose output\n");
fprintf(stderr, "\n");
fprintf(stderr, "Mode of operation:\n");
fprintf(stderr, " [default] write file contents to flash, then verify\n");
fprintf(stderr, " -r read first 256 kB from flash and write to file\n");
fprintf(stderr, " -R <size in bytes> read the specified number of bytes from flash\n");
fprintf(stderr, " (append 'k' to the argument for size in kilobytes,\n");
fprintf(stderr, " or 'M' for size in megabytes)\n");
fprintf(stderr, " -c do not write flash, only verify (`check')\n");
fprintf(stderr, " -S perform SRAM programming\n");
fprintf(stderr, " -t just read the flash ID sequence\n");
fprintf(stderr, "\n");
fprintf(stderr, "Erase mode (only meaningful in default mode):\n");
fprintf(stderr, " [default] erase aligned chunks of 64kB in write mode\n");
fprintf(stderr, " This means that some data after the written data (or\n");
fprintf(stderr, " even before when -o is used) may be erased as well.\n");
fprintf(stderr, " -b bulk erase entire flash before writing\n");
fprintf(stderr, " -n do not erase flash before writing\n");
fprintf(stderr, "\n");
fprintf(stderr, "Miscellaneous options:\n");
fprintf(stderr, " --help display this help and exit\n");
fprintf(stderr, " -- treat all remaining arguments as filenames\n");
fprintf(stderr, "\n");
fprintf(stderr, "Exit status:\n");
fprintf(stderr, " 0 on success,\n");
fprintf(stderr, " 1 if a non-hardware error occurred (e.g., failure to read from or\n");
fprintf(stderr, " write to a file, or invoked with invalid options),\n");
fprintf(stderr, " 2 if communication with the hardware failed (e.g., cannot find the\n");
fprintf(stderr, " iCE FTDI USB device),\n");
fprintf(stderr, " 3 if verification of the data failed.\n");
fprintf(stderr, "\n");
fprintf(stderr, "Notes for iCEstick (iCE40HX-1k devel board):\n");
fprintf(stderr, " An unmodified iCEstick can only be programmed via the serial flash.\n");
fprintf(stderr, " Direct programming of the SRAM is not supported. For direct SRAM\n");
fprintf(stderr, " programming the flash chip and one zero ohm resistor must be desoldered\n");
fprintf(stderr, " and the FT2232H SI pin must be connected to the iCE SPI_SI pin, as shown\n");
fprintf(stderr, " in this picture:\n");
fprintf(stderr, " http://www.clifford.at/gallery/2014-elektronik/IMG_20141115_183838\n");
fprintf(stderr, "\n");
fprintf(stderr, "Notes for the iCE40-HX8K Breakout Board:\n");
fprintf(stderr, " Make sure that the jumper settings on the board match the selected\n");
fprintf(stderr, " mode (SRAM or FLASH). See the iCE40-HX8K user manual for details.\n");
fprintf(stderr, "\n");
fprintf(stderr, "If you have a bug report, please file an issue on github:\n");
fprintf(stderr, " https://github.com/cliffordwolf/icestorm/issues\n");
}
int main(int argc, char **argv)
{
/* used for error reporting */
const char *my_name = argv[0];
for (size_t i = 0; argv[0][i]; i++)
if (argv[0][i] == '/')
my_name = argv[0] + i + 1;
int read_size = 256 * 1024;
int rw_offset = 0;
bool read_mode = false;
bool check_mode = false;
bool bulk_erase = false;
bool dont_erase = false;
bool prog_sram = false;
bool test_mode = false;
const char *filename = NULL;
const char *devstr = NULL;
enum ftdi_interface ifnum = INTERFACE_A;
static struct option long_options[] = {
{"help", no_argument, NULL, -2},
{NULL, 0, NULL, 0}
};
int opt;
char *endptr;
while ((opt = getopt_long(argc, argv, "d:I:rR:o:cbnStv", long_options, NULL)) != -1) {
switch (opt) {
case 'd':
devstr = optarg;
break;
case 'I':
if (!strcmp(optarg, "A"))
ifnum = INTERFACE_A;
else if (!strcmp(optarg, "B"))
ifnum = INTERFACE_B;
else if (!strcmp(optarg, "C"))
ifnum = INTERFACE_C;
else if (!strcmp(optarg, "D"))
ifnum = INTERFACE_D;
else {
fprintf(stderr, "%s: `%s' is not a valid interface (must be `A', `B', `C', or `D')\n", my_name, optarg);
return EXIT_FAILURE;
}
break;
case 'r':
read_mode = true;
break;
case 'R':
read_mode = true;
read_size = strtol(optarg, &endptr, 0);
if (*endptr == '\0')
/* ok */;
else if (!strcmp(endptr, "k"))
read_size *= 1024;
else if (!strcmp(endptr, "M"))
read_size *= 1024 * 1024;
else {
fprintf(stderr, "%s: `%s' is not a valid size\n", my_name, optarg);
return EXIT_FAILURE;
}
break;
case 'o':
rw_offset = strtol(optarg, &endptr, 0);
if (*endptr == '\0')
/* ok */;
else if (!strcmp(endptr, "k"))
rw_offset *= 1024;
else if (!strcmp(endptr, "M"))
rw_offset *= 1024 * 1024;
else {
fprintf(stderr, "%s: `%s' is not a valid offset\n", my_name, optarg);
return EXIT_FAILURE;
}
break;
case 'c':
check_mode = true;
break;
case 'b':
bulk_erase = true;
break;
case 'n':
dont_erase = true;
break;
case 'S':
prog_sram = true;
break;
case 't':
test_mode = true;
break;
case 'v':
verbose = true;
break;
case -2:
help(argv[0]);
return EXIT_SUCCESS;
default:
/* error message has already been printed */
fprintf(stderr, "Try `%s --help' for more information.\n", argv[0]);
return EXIT_FAILURE;
}
}
if (read_mode + check_mode + prog_sram + test_mode > 1) {
fprintf(stderr, "%s: options `-r'/`-R', `-c', `-S', and `-t' are mutually exclusive\n", my_name);
return EXIT_FAILURE;
}
if (bulk_erase && dont_erase) {
fprintf(stderr, "%s: options `-b' and `-n' are mutually exclusive\n", my_name);
return EXIT_FAILURE;
}
if (bulk_erase && (read_mode || check_mode || prog_sram || test_mode)) {
fprintf(stderr, "%s: option `-b' only valid in programming mode\n", my_name);
return EXIT_FAILURE;
}
if (dont_erase && (read_mode || check_mode || prog_sram || test_mode)) {
fprintf(stderr, "%s: option `-n' only valid in programming mode\n", my_name);
return EXIT_FAILURE;
}
if (rw_offset != 0 && prog_sram) {
fprintf(stderr, "%s: option `-o' not supported in SRAM mode\n", my_name);
return EXIT_FAILURE;
}
if (rw_offset != 0 && test_mode) {
fprintf(stderr, "%s: option `-o' not supported in test mode\n", my_name);
return EXIT_FAILURE;
}
if (optind + 1 == argc) {
if (test_mode) {
fprintf(stderr, "%s: test mode doesn't take a file name\n", my_name);
fprintf(stderr, "Try `%s --help' for more information.\n", argv[0]);
return EXIT_FAILURE;
}
filename = argv[optind];
} else if (optind != argc) {
fprintf(stderr, "%s: too many arguments\n", my_name);
fprintf(stderr, "Try `%s --help' for more information.\n", argv[0]);
return EXIT_FAILURE;
} else if (bulk_erase) {
filename = "/dev/null";
} else if (!test_mode) {
fprintf(stderr, "%s: missing argument\n", my_name);
fprintf(stderr, "Try `%s --help' for more information.\n", argv[0]);
return EXIT_FAILURE;
}
/* open input/output file in advance
so we can fail before initializing the hardware */
FILE *f = NULL;
long file_size = -1;
if (test_mode)
/* nop */;
else if (read_mode) {
f = (strcmp(filename, "-") == 0) ? stdout : fopen(filename, "wb");
if (f == NULL) {
fprintf(stderr, "%s: can't open '%s' for writing: ", my_name, filename);
perror(0);
return EXIT_FAILURE;
}
} else {
f = (strcmp(filename, "-") == 0) ? stdin : fopen(filename, "rb");
if (f == NULL) {
fprintf(stderr, "%s: can't open '%s' for reading: ", my_name, filename);
perror(0);
return EXIT_FAILURE;
}
/* For regular programming, we need to read the file
twice--once for programming and once for verifying--and
need to know the file size in advance in order to erase
the correct amount of memory.
See if we can seek on the input file. Checking for "-"
as an argument isn't enough as we might be reading from a
named pipe, or contrarily, the standard input may be an
ordinary file. */
if (!prog_sram && !check_mode) {
if (fseek(f, 0L, SEEK_END) != -1) {
file_size = ftell(f);
if (file_size == -1) {
fprintf(stderr, "%s: %s: ftell: ", my_name, filename);
perror(0);
return EXIT_FAILURE;
}
if (fseek(f, 0L, SEEK_SET) == -1) {
fprintf(stderr, "%s: %s: fseek: ", my_name, filename);
perror(0);
return EXIT_FAILURE;
}
} else {
FILE *pipe = f;
f = tmpfile();
if (f == NULL) {
fprintf(stderr, "%s: can't open temporary file\n", my_name);
return EXIT_FAILURE;
}
file_size = 0;
while (true) {
static unsigned char buffer[4096];
size_t rc = fread(buffer, 1, 4096, pipe);
if (rc <= 0)
break;
size_t wc = fwrite(buffer, 1, rc, f);
if (wc != rc) {
fprintf(stderr, "%s: can't write to temporary file\n", my_name);
return EXIT_FAILURE;
}
file_size += rc;
}
fclose(pipe);
/* now seek to the beginning so we can
start reading again */
fseek(f, 0, SEEK_SET);
}
}
}
// ---------------------------------------------------------
// Initialize USB connection to FT2232H
// ---------------------------------------------------------
fprintf(stderr, "init..\n");
ftdi_init(&ftdic);
ftdi_set_interface(&ftdic, ifnum);
if (devstr != NULL) {
if (ftdi_usb_open_string(&ftdic, devstr)) {
fprintf(stderr, "Can't find iCE FTDI USB device (device string %s).\n", devstr);
error(2);
}
} else {
if (ftdi_usb_open(&ftdic, 0x0403, 0x6010)) {
fprintf(stderr, "Can't find iCE FTDI USB device (vendor_id 0x0403, device_id 0x6010).\n");
error(2);
}
}
ftdic_open = true;
if (ftdi_usb_reset(&ftdic)) {
fprintf(stderr, "Failed to reset iCE FTDI USB device.\n");
error(2);
}
if (ftdi_usb_purge_buffers(&ftdic)) {
fprintf(stderr, "Failed to purge buffers on iCE FTDI USB device.\n");
error(2);
}
if (ftdi_get_latency_timer(&ftdic, &ftdi_latency) < 0) {
fprintf(stderr, "Failed to get latency timer (%s).\n", ftdi_get_error_string(&ftdic));
error(2);
}
/* 1 is the fastest polling, it means 1 kHz polling */
if (ftdi_set_latency_timer(&ftdic, 1) < 0) {
fprintf(stderr, "Failed to set latency timer (%s).\n", ftdi_get_error_string(&ftdic));
error(2);
}
ftdic_latency_set = true;
if (ftdi_set_bitmode(&ftdic, 0xff, BITMODE_MPSSE) < 0) {
fprintf(stderr, "Failed to set BITMODE_MPSSE on iCE FTDI USB device.\n");
error(2);
}
// enable clock divide by 5
send_byte(0x8b);
// set 6 MHz clock
send_byte(0x86);
send_byte(0x00);
send_byte(0x00);
fprintf(stderr, "cdone: %s\n", get_cdone() ? "high" : "low");
set_gpio(1, 1);
usleep(100000);
if (test_mode)
{
fprintf(stderr, "reset..\n");
set_gpio(1, 0);
usleep(250000);
fprintf(stderr, "cdone: %s\n", get_cdone() ? "high" : "low");
flash_power_up();
flash_read_id();
flash_power_down();
set_gpio(1, 1);
usleep(250000);
fprintf(stderr, "cdone: %s\n", get_cdone() ? "high" : "low");
}
else if (prog_sram)
{
// ---------------------------------------------------------
// Reset
// ---------------------------------------------------------
fprintf(stderr, "reset..\n");
set_gpio(0, 0);
usleep(100);
set_gpio(0, 1);
usleep(2000);
fprintf(stderr, "cdone: %s\n", get_cdone() ? "high" : "low");
// ---------------------------------------------------------
// Program
// ---------------------------------------------------------
fprintf(stderr, "programming..\n");
while (1) {
static unsigned char buffer[4096];
int rc = fread(buffer, 1, 4096, f);
if (rc <= 0)
break;
if (verbose)
fprintf(stderr, "sending %d bytes.\n", rc);
send_spi(buffer, rc);
}
// add 48 dummy bits
send_byte(0x8f);
send_byte(0x05);
send_byte(0x00);
// add 1 more dummy bit
send_byte(0x8e);
send_byte(0x00);
fprintf(stderr, "cdone: %s\n", get_cdone() ? "high" : "low");
}
else
{
// ---------------------------------------------------------
// Reset
// ---------------------------------------------------------
fprintf(stderr, "reset..\n");
set_gpio(1, 0);
usleep(250000);
fprintf(stderr, "cdone: %s\n", get_cdone() ? "high" : "low");
flash_power_up();
flash_read_id();
// ---------------------------------------------------------
// Program
// ---------------------------------------------------------
if (!read_mode && !check_mode)
{
if (!dont_erase)
{
if (bulk_erase)
{
flash_write_enable();
flash_bulk_erase();
flash_wait();
}
else
{
fprintf(stderr, "file size: %ld\n", file_size);
int begin_addr = rw_offset & ~0xffff;
int end_addr = (rw_offset + file_size + 0xffff) & ~0xffff;
for (int addr = begin_addr; addr < end_addr; addr += 0x10000) {
flash_write_enable();
flash_64kB_sector_erase(addr);
flash_wait();
}
}
}
fprintf(stderr, "programming..\n");
for (int rc, addr = 0; true; addr += rc) {
uint8_t buffer[256];
int page_size = 256 - (rw_offset + addr) % 256;
rc = fread(buffer, 1, page_size, f);
if (rc <= 0)
break;
flash_write_enable();
flash_prog(rw_offset + addr, buffer, rc);
flash_wait();
}
/* seek to the beginning for second pass */
fseek(f, 0, SEEK_SET);
}
// ---------------------------------------------------------
// Read/Verify
// ---------------------------------------------------------
if (read_mode) {
fprintf(stderr, "reading..\n");
for (int addr = 0; addr < read_size; addr += 256) {
uint8_t buffer[256];
flash_read(rw_offset + addr, buffer, 256);
fwrite(buffer, read_size - addr > 256 ? 256 : read_size - addr, 1, f);
}
} else {
fprintf(stderr, "reading..\n");
for (int addr = 0; true; addr += 256) {
uint8_t buffer_flash[256], buffer_file[256];
int rc = fread(buffer_file, 1, 256, f);
if (rc <= 0)
break;
flash_read(rw_offset + addr, buffer_flash, rc);
if (memcmp(buffer_file, buffer_flash, rc)) {
fprintf(stderr, "Found difference between flash and file!\n");
error(3);
}
}
fprintf(stderr, "VERIFY OK\n");
}
// ---------------------------------------------------------
// Reset
// ---------------------------------------------------------
flash_power_down();
set_gpio(1, 1);
usleep(250000);
fprintf(stderr, "cdone: %s\n", get_cdone() ? "high" : "low");
}
if (f != NULL && f != stdin && f != stdout)
fclose(f);
// ---------------------------------------------------------
// Exit
// ---------------------------------------------------------
fprintf(stderr, "Bye.\n");
ftdi_set_latency_timer(&ftdic, ftdi_latency);
ftdi_disable_bitbang(&ftdic);
ftdi_usb_close(&ftdic);
ftdi_deinit(&ftdic);
return 0;
}
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