mspdebug/olimex.c

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/* MSPDebug - debugging tool for the eZ430
* Copyright (C) 2009-2011 Daniel Beer
* Copyright (C) 2010 Peter Jansen
*
* 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 "olimex.h"
#include "util.h"
#include "usbutil.h"
#include "output.h"
struct olimex_transport {
struct transport base;
int int_number;
struct usb_dev_handle *handle;
int in_ep;
int out_ep;
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 0x15ba
#define V1_PRODUCT 0x0002
#define V1_INTERFACE_CLASS 255
#define V1_IN_EP 0x81
#define V1_OUT_EP 0x01
#define V2_PRODUCT 0x0031
#define V2_INTERFACE_CLASS 10
#define V2_IN_EP 0x82
#define V2_OUT_EP 0x02
#define CP210x_REQTYPE_HOST_TO_DEVICE 0x41
#define CP210X_IFC_ENABLE 0x00
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#define CP210X_SET_BAUDDIV 0x01
#define CP210X_SET_MHS 0x07
#define TIMEOUT 10000
static int open_interface(struct olimex_transport *tr,
struct usb_device *dev, int ino)
{
#if defined(__linux__)
int drv;
char drName[256];
#endif
printc(__FILE__": Trying to open interface %d on %s\n",
ino, dev->filename);
tr->int_number = ino;
tr->handle = usb_open(dev);
if (!tr->handle) {
pr_error(__FILE__": can't open device");
return -1;
}
#if defined(__linux__)
drv = usb_get_driver_np(tr->handle, tr->int_number, drName,
sizeof(drName));
printc(__FILE__" : driver %d\n", drv);
if (drv >= 0) {
if (usb_detach_kernel_driver_np(tr->handle,
tr->int_number) < 0)
pr_error(__FILE__": warning: can't detach "
"kernel driver");
}
#endif
if (usb_claim_interface(tr->handle, tr->int_number) < 0) {
pr_error(__FILE__": can't claim interface");
usb_close(tr->handle);
return -1;
}
int ret = usb_control_msg(tr->handle, CP210x_REQTYPE_HOST_TO_DEVICE,
CP210X_IFC_ENABLE, 0x1, 0, NULL, 0, 300);
#ifdef DEBUG_OLIMEX
printc(__FILE__": %s : Sending control message ret %d\n",
__FUNCTION__, ret);
#endif
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/* Set the baud rate to 500000 bps */
ret = usb_control_msg(tr->handle, CP210x_REQTYPE_HOST_TO_DEVICE,
CP210X_SET_BAUDDIV, 0x7, 0, NULL, 0, 300);
#ifdef DEBUG_OLIMEX
printc(__FILE__": %s : Sending control message ret %d\n",
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__FUNCTION__, ret);
#endif
/* Set the modem control settings.
* Set RTS, DTR and WRITE_DTR, WRITE_RTS
*/
ret = usb_control_msg(tr->handle, CP210x_REQTYPE_HOST_TO_DEVICE,
CP210X_SET_MHS, 0x303, 0, NULL, 0, 300);
#ifdef DEBUG_OLIMEX
printc(__FILE__": %s : Sending control message ret %d\n",
__FUNCTION__, ret);
#endif
return 0;
}
static int open_device(struct olimex_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 == V1_INTERFACE_CLASS &&
!open_interface(tr, dev, desc->bInterfaceNumber)) {
printc_dbg("olimex: rev 1 device\n");
tr->in_ep = V1_IN_EP;
tr->out_ep = V1_OUT_EP;
return 0;
} else if (desc->bInterfaceClass == V2_INTERFACE_CLASS &&
!open_interface(tr, dev, desc->bInterfaceNumber)) {
printc_dbg("olimex: rev 2 device\n");
tr->in_ep = V2_IN_EP;
tr->out_ep = V2_OUT_EP;
return 0;
}
}
return -1;
}
static int usbtr_send(transport_t tr_base, const uint8_t *data, int len)
{
struct olimex_transport *tr = (struct olimex_transport *)tr_base;
int sent;
while (len) {
#ifdef DEBUG_OLIMEX
debug_hexdump(__FILE__": USB transfer out", data, len);
#endif
sent = usb_bulk_write(tr->handle, tr->out_ep,
(char *)data, len, TIMEOUT);
if (sent < 0) {
pr_error(__FILE__": can't send data");
return -1;
}
len -= sent;
}
return 0;
}
static int usbtr_recv(transport_t tr_base, uint8_t *databuf, int max_len)
{
struct olimex_transport *tr = (struct olimex_transport *)tr_base;
int rlen;
#ifdef DEBUG_OLIMEX
printc(__FILE__": %s : read max %d\n", __FUNCTION__, max_len);
#endif
rlen = usb_bulk_read(tr->handle, tr->in_ep, (char *)databuf,
max_len, TIMEOUT);
#ifdef DEBUG_OLIMEX
printc(__FILE__": %s : read %d\n", __FUNCTION__, rlen);
#endif
if (rlen < 0) {
pr_error(__FILE__": can't receive data");
return -1;
}
#ifdef DEBUG_OLIMEX
debug_hexdump(__FILE__": USB transfer in", databuf, rlen);
#endif
return rlen;
}
static void usbtr_destroy(transport_t tr_base)
{
struct olimex_transport *tr = (struct olimex_transport *)tr_base;
usb_release_interface(tr->handle, tr->int_number);
usb_close(tr->handle);
free(tr);
}
transport_t olimex_open(const char *devpath, const char *requested_serial)
{
struct olimex_transport *tr = malloc(sizeof(*tr));
struct usb_device *dev;
char buf[64];
if (!tr) {
pr_error(__FILE__": 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, V1_PRODUCT,
requested_serial);
if (!dev)
dev = usbutil_find_by_id(USB_FET_VENDOR, V2_PRODUCT,
requested_serial);
}
if (!dev) {
free(tr);
return NULL;
}
if (open_device(tr, dev) < 0) {
printc_err(__FILE__ ": failed to open Olimex device\n");
return NULL;
}
/* Flush out lingering data */
while (usb_bulk_read(tr->handle, tr->in_ep,
buf, sizeof(buf),
100) >= 0);
return (transport_t)tr;
}