mspdebug/rf2500.c

228 lines
5.3 KiB
C

/* MSPDebug - debugging tool for the eZ430
* Copyright (C) 2009, 2010 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 <string.h>
#include <usb.h>
#include "rf2500.h"
#include "util.h"
#include "usbutil.h"
struct rf2500_transport {
struct transport base;
int int_number;
struct usb_dev_handle *handle;
uint8_t buf[64];
int len;
int offset;
};
/*********************************************************************
* USB transport
*
* These functions handle the details of slicing data over USB
* transfers. The interface presented is a continuous byte stream with
* no slicing codes.
*
* Writes are unbuffered -- a single write translates to at least
* one transfer.
*/
#define USB_FET_VENDOR 0x0451
#define USB_FET_PRODUCT 0xf432
#define USB_FET_INTERFACE_CLASS 3
#define USB_FET_IN_EP 0x81
#define USB_FET_OUT_EP 0x01
static int open_interface(struct rf2500_transport *tr,
struct usb_device *dev, int ino)
{
printf("Trying to open interface %d on %s\n", ino, dev->filename);
tr->int_number = ino;
tr->handle = usb_open(dev);
if (!tr->handle) {
perror("rf2500: can't open device");
return -1;
}
#if !(defined(__APPLE__) || defined(WIN32))
if (usb_detach_kernel_driver_np(tr->handle, tr->int_number) < 0)
perror("rf2500: warning: can't "
"detach kernel driver");
#endif
if (usb_claim_interface(tr->handle, tr->int_number) < 0) {
perror("rf2500: can't claim interface");
usb_close(tr->handle);
return -1;
}
return 0;
}
static int open_device(struct rf2500_transport *tr,
struct usb_device *dev)
{
struct usb_config_descriptor *c = &dev->config[0];
int i;
for (i = 0; i < c->bNumInterfaces; i++) {
struct usb_interface *intf = &c->interface[i];
struct usb_interface_descriptor *desc = &intf->altsetting[0];
if (desc->bInterfaceClass == USB_FET_INTERFACE_CLASS &&
!open_interface(tr, dev, desc->bInterfaceNumber))
return 0;
}
return -1;
}
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("USB transfer out", pbuf, txlen);
#endif
if (usb_bulk_write(tr->handle, USB_FET_OUT_EP,
(char *)pbuf, txlen, 10000) < 0) {
perror("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 (usb_bulk_read(tr->handle, USB_FET_IN_EP,
(char *)tr->buf, sizeof(tr->buf),
10000) < 0) {
perror("rf2500: can't receive data");
return -1;
}
#ifdef DEBUG_USBTR
debug_hexdump("USB 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;
usb_release_interface(tr->handle, tr->int_number);
usb_close(tr->handle);
free(tr);
}
transport_t rf2500_open(const char *devpath)
{
struct rf2500_transport *tr = malloc(sizeof(*tr));
struct usb_device *dev;
char buf[64];
if (!tr) {
perror("rf2500: can't allocate memory");
return NULL;
}
tr->base.destroy = usbtr_destroy;
tr->base.send = usbtr_send;
tr->base.recv = usbtr_recv;
usb_init();
usb_find_busses();
usb_find_devices();
if (devpath)
dev = usbutil_find_by_loc(devpath);
else
dev = usbutil_find_by_id(USB_FET_VENDOR, USB_FET_PRODUCT);
if (!dev) {
free(tr);
return NULL;
}
if (open_device(tr, dev) < 0) {
fprintf(stderr, "rf2500: failed to open RF2500 device\n");
return NULL;
}
/* Flush out lingering data.
*
* The timeout apparently doesn't work on OS/X, and this loop
* just hangs once the endpoint buffer empties.
*/
#ifndef __APPLE__
while (usb_bulk_read(tr->handle, USB_FET_IN_EP,
buf, sizeof(buf),
100) >= 0);
#endif
return (transport_t)tr;
}