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/*
This file is part of TALER
Copyright (C) 2022 Taler Systems SA
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more
details.
You should have received a copy of the GNU General Public License
along with
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @brief Program to talk to the coin acceptor via USB-RS232.
*
* @author Christian Grothoff
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <libusb-1.0/libusb.h>
// FIXME: make this configurable later...
/* future technology devices international */
#define VENDOR_ID 0x0403
/* FT232 Serial UART IC */
#define PRODUCT_ID 0x6001
#define USB_CTL_REQ_SET_LINE_CODING 0x20
#define LEO_ONE_STOP_BIT 0x00
#define LEO_ONEHALF_STOP_BIT 0x01
#define LEO_TWO_STOP_BIT 0x02
#define LEO_PARITY_NONE 0x00
#define LEO_PARITY_ODD 0x01
#define LEO_PARITY_EVEN 0x02
#define LEO_PARITY_MARK 0x03
#define LEO_PARITY_SPACE 0x04
#define ACM_CTRL_DTR 0x01
#define ACM_CTRL_RTS 0x02
/**
* Handle to USB device.
*/
static struct libusb_device_handle *device_handle;
/* The Endpoint address are hard coded. You should use lsusb -v to find
* the values corresponding to your device.
*/
static int ep_in_addr = 0x83;
static int ep_out_addr = 0x02;
static int
read_char (void)
{
int actual_length;
unsigned char data;
int rc;
rc = libusb_bulk_transfer (device_handle,
ep_in_addr,
&data,
sizeof (data),
&actual_length,
1000 /* timeout? */);
if (rc == LIBUSB_ERROR_TIMEOUT)
{
fprintf (stderr,
"TIMEOUT\n");
return EOF;
}
if (rc < 0)
{
fprintf (stderr,
"Error %s while waiting for char\n",
libusb_error_name (rc));
return EOF;
}
return data;
}
int
main (int argc,
char **argv)
{
int rc;
rc = libusb_init (NULL);
if (rc < 0)
{
fprintf (stderr,
"Error initializing usb: %s\n",
libusb_error_name (rc));
return 1;
}
libusb_set_debug (NULL,
3);
device_handle = libusb_open_device_with_vid_pid (NULL,
VENDOR_ID,
PRODUCT_ID);
if (NULL == device_handle)
{
fprintf (stderr,
"Error finding USB device\n");
libusb_exit (NULL);
return 1;
}
/* Maybe there is someone else attached, detach other drivers from
all the USB interfaces. NOTE: not sure if there are *2*! */
for (int if_num = 0; if_num < 2; if_num++)
{
if (libusb_kernel_driver_active (device_handle,
if_num))
{
libusb_detach_kernel_driver (device_handle,
if_num);
}
rc = libusb_claim_interface (device_handle,
if_num);
if (rc < 0)
{
fprintf (stderr,
"Error claiming interface: %s\n",
libusb_error_name (rc));
libusb_close (device_handle);
libusb_exit (NULL);
return 1;
}
}
#if 1
rc = libusb_control_transfer (device_handle,
0x21,
0x22,
ACM_CTRL_DTR | ACM_CTRL_RTS,
0,
NULL,
0,
0);
if (rc < 0)
{
fprintf (stderr,
"Error during control transfer: %s\n",
libusb_error_name (rc));
libusb_close (device_handle);
libusb_exit (NULL);
return 1;
}
#endif
/* - set line encoding: here 9600 8N1
* 9600 = 0x2580 ~> 0x80, 0x25 in little endian
*/
{
struct LineEncodingOptions
{
/**
* In *little* endian.
*/
uint32_t baud_rate;
uint8_t b_char_format;
uint8_t b_parity_type;
uint8_t b_data_bits;
} leo = {
.baud_rate = __builtin_bswap32 (htonl (4800)),
.b_char_format = LEO_ONE_STOP_BIT,
.b_parity_type = LEO_PARITY_ODD,
.b_data_bits = 0x08
};
rc = libusb_control_transfer (device_handle,
0x21,
USB_CTL_REQ_SET_LINE_CODING,
0,
0,
(unsigned char *) &leo,
sizeof(leo),
0);
if (rc < 0)
{
fprintf (stderr,
"Error during control transfer: %s\n",
libusb_error_name (rc));
libusb_close (device_handle);
libusb_exit (NULL);
return 1;
}
}
/* FIXME: proper event loop... */
while (1)
{
int in = read_char ();
if (-1 != in)
fprintf (stdout,
"Received: %d\n",
in);
}
libusb_release_interface (device_handle,
0);
libusb_close (device_handle);
libusb_exit (NULL);
return 0;
}
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