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/* MSPDebug - debugging tool for the eZ430
* Copyright (C) 2009-2012 Daniel Beer
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <hidapi.h>
#include "rf2500.h"
#include "util.h"
#include "usbutil.h"
#include "output.h"
#define USB_FET_VENDOR 0x0451
#define USB_FET_PRODUCT 0xf432
#define USB_FET_IN_EP 0x81
#define USB_FET_OUT_EP 0x01
struct rf2500_transport {
struct transport base;
hid_device *handle;
uint8_t buf[64];
int len;
int offset;
};
static int usbtr_send(transport_t tr_base, const uint8_t *data, int len)
{
struct rf2500_transport *tr = (struct rf2500_transport *)tr_base;
while (len) {
uint8_t pbuf[256];
int plen = len > 255 ? 255 : len;
int txlen = plen + 1;
memcpy(pbuf + 1, data, plen);
/* This padding is needed to work around an apparent bug in
* the RF2500 FET. Without this, the device hangs.
*/
if (txlen > 32 && (txlen & 0x3f))
while (txlen < 255 && (txlen & 0x3f))
pbuf[txlen++] = 0xff;
else if (txlen > 16 && (txlen & 0xf))
while (txlen < 255 && (txlen & 0xf) != 1)
pbuf[txlen++] = 0xff;
pbuf[0] = txlen - 1;
#ifdef DEBUG_USBTR
debug_hexdump("HIDUSB transfer out", pbuf, txlen);
#endif
if (hid_write(tr->handle,
(const unsigned char *)pbuf, txlen) < 0) {
pr_error("rf2500: can't send data");
return -1;
}
data += plen;
len -= plen;
}
return 0;
}
static int usbtr_recv(transport_t tr_base, uint8_t *databuf, int max_len)
{
struct rf2500_transport *tr = (struct rf2500_transport *)tr_base;
int rlen;
if (tr->offset >= tr->len) {
if (hid_read_timeout(tr->handle, (unsigned char *)tr->buf,
sizeof(tr->buf), 10000) < 0) {
pr_error("rf2500: can't receive data");
return -1;
}
#ifdef DEBUG_USBTR
debug_hexdump("HIDUSB transfer in", tr->buf, 64);
#endif
tr->len = tr->buf[1] + 2;
if (tr->len > sizeof(tr->buf))
tr->len = sizeof(tr->buf);
tr->offset = 2;
}
rlen = tr->len - tr->offset;
if (rlen > max_len)
rlen = max_len;
memcpy(databuf, tr->buf + tr->offset, rlen);
tr->offset += rlen;
return rlen;
}
static void usbtr_destroy(transport_t tr_base)
{
struct rf2500_transport *tr = (struct rf2500_transport *)tr_base;
hid_close(tr->handle);
free(tr);
hid_exit();
}
static int usbtr_flush(transport_t tr_base)
{
struct rf2500_transport *tr = (struct rf2500_transport *)tr_base;
unsigned char buf[64];
/* Flush out lingering data.
*
* The timeout apparently doesn't work on OS/X, and this loop
* just hangs once the endpoint buffer empties.
*/
while (hid_read_timeout(tr->handle, buf, sizeof(buf), 100) > 0);
tr->len = 0;
tr->offset = 0;
return 0;
}
static int usbtr_set_modem(transport_t tr_base, transport_modem_t state)
{
printc_err("rf2500: unsupported operation: set_modem\n");
return -1;
}
static const struct transport_class rf2500_transport = {
.destroy = usbtr_destroy,
.send = usbtr_send,
.recv = usbtr_recv,
.flush = usbtr_flush,
.set_modem = usbtr_set_modem
};
static const wchar_t * get_wc(const char *c)
{
const size_t csize = strlen(c)+1;
wchar_t* wc = malloc(sizeof(wchar_t)*csize);
mbstowcs (wc, c, csize);
return wc;
}
transport_t rf2500_open(const char *devpath, const char *requested_serial)
{
struct rf2500_transport *tr = malloc(sizeof(*tr));
hid_device *handle;
if (!tr) {
pr_error("rf2500: can't allocate memory");
return NULL;
}
memset(tr, 0, sizeof(*tr));
tr->base.ops = &rf2500_transport;
hid_init();
if (devpath) {
handle = hid_open_path(devpath);
}
else {
const wchar_t * wc_serial;
if ( requested_serial ) {
wc_serial = get_wc(requested_serial);
} else {
wc_serial = NULL;
}
handle = hid_open(USB_FET_VENDOR, USB_FET_PRODUCT, wc_serial);
if ( wc_serial ) {
free((wchar_t *)wc_serial);
}
}
if (!handle) {
printc_err("rf2500: failed to open RF2500 device\n");
free(tr);
hid_exit();
return NULL;
}
tr->handle = handle;
usbtr_flush(&tr->base);
return (transport_t)tr;
}
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