1 /***************************************************************************
2 * Copyright (C) 2018 by Mickaƫl Thomas *
5 * Copyright (C) 2016 by Maksym Hilliaka *
6 * oter@frozen-team.com *
8 * Copyright (C) 2016 by Phillip Pearson *
11 * Copyright (C) 2014 by Paul Fertser *
12 * fercerpav@gmail.com *
14 * Copyright (C) 2013 by mike brown *
15 * mike@theshedworks.org.uk *
17 * Copyright (C) 2013 by Spencer Oliver *
18 * spen@spen-soft.co.uk *
20 * This program is free software; you can redistribute it and/or modify *
21 * it under the terms of the GNU General Public License as published by *
22 * the Free Software Foundation; either version 2 of the License, or *
23 * (at your option) any later version. *
25 * This program is distributed in the hope that it will be useful, *
26 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
27 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
28 * GNU General Public License for more details. *
30 * You should have received a copy of the GNU General Public License *
31 * along with this program. If not, see <http://www.gnu.org/licenses/>. *
32 ***************************************************************************/
38 #include <helper/system.h>
40 #include <helper/log.h>
41 #include <helper/replacements.h>
43 #include "cmsis_dap.h"
45 struct cmsis_dap_backend_data
{
46 struct libusb_context
*usb_ctx
;
47 struct libusb_device_handle
*dev_handle
;
53 static int cmsis_dap_usb_interface
= -1;
55 static void cmsis_dap_usb_close(struct cmsis_dap
*dap
);
56 static int cmsis_dap_usb_alloc(struct cmsis_dap
*dap
, unsigned int pkt_sz
);
58 static int cmsis_dap_usb_open(struct cmsis_dap
*dap
, uint16_t vids
[], uint16_t pids
[], char *serial
)
61 struct libusb_context
*ctx
;
62 struct libusb_device
**device_list
;
64 err
= libusb_init(&ctx
);
66 LOG_ERROR("libusb initialization failed: %s", libusb_strerror(err
));
70 int num_devices
= libusb_get_device_list(ctx
, &device_list
);
71 if (num_devices
< 0) {
72 LOG_ERROR("could not enumerate USB devices: %s", libusb_strerror(num_devices
));
77 for (int i
= 0; i
< num_devices
; i
++) {
78 struct libusb_device
*dev
= device_list
[i
];
79 struct libusb_device_descriptor dev_desc
;
81 err
= libusb_get_device_descriptor(dev
, &dev_desc
);
83 LOG_ERROR("could not get device descriptor for device %d: %s", i
, libusb_strerror(err
));
89 bool id_match
= false;
90 bool id_filter
= vids
[0] || pids
[0];
91 for (int id
= 0; vids
[id
] || pids
[id
]; id
++) {
92 id_match
= !vids
[id
] || dev_desc
.idVendor
== vids
[id
];
93 id_match
&= !pids
[id
] || dev_desc
.idProduct
== pids
[id
];
99 if (id_filter
&& !id_match
)
102 /* Don't continue if we asked for a serial number and the device doesn't have one */
103 if (dev_desc
.iSerialNumber
== 0 && serial
&& serial
[0])
106 struct libusb_device_handle
*dev_handle
= NULL
;
107 err
= libusb_open(dev
, &dev_handle
);
109 /* It's to be expected that most USB devices can't be opened
110 * so only report an error if it was explicitly selected
113 LOG_ERROR("could not open device 0x%04x:0x%04x: %s",
114 dev_desc
.idVendor
, dev_desc
.idProduct
, libusb_strerror(err
));
116 LOG_DEBUG("could not open device 0x%04x:0x%04x: %s",
117 dev_desc
.idVendor
, dev_desc
.idProduct
, libusb_strerror(err
));
122 /* Match serial number */
124 bool serial_match
= false;
125 char dev_serial
[256] = {0};
126 if (dev_desc
.iSerialNumber
> 0) {
127 err
= libusb_get_string_descriptor_ascii(
128 dev_handle
, dev_desc
.iSerialNumber
,
129 (uint8_t *)dev_serial
, sizeof(dev_serial
));
132 const char *msg
= "could not read serial number for device 0x%04x:0x%04x: %s";
134 LOG_WARNING(msg
, dev_desc
.idVendor
, dev_desc
.idProduct
,
135 libusb_strerror(err
));
137 LOG_DEBUG(msg
, dev_desc
.idVendor
, dev_desc
.idProduct
,
138 libusb_strerror(err
));
139 } else if (serial
&& strncmp(dev_serial
, serial
, sizeof(dev_serial
)) == 0) {
144 if (serial
&& !serial_match
) {
145 libusb_close(dev_handle
);
149 /* Find the CMSIS-DAP string in product string */
151 bool cmsis_dap_in_product_str
= false;
152 char product_string
[256] = {0};
153 if (dev_desc
.iProduct
> 0) {
154 err
= libusb_get_string_descriptor_ascii(
155 dev_handle
, dev_desc
.iProduct
,
156 (uint8_t *)product_string
, sizeof(product_string
));
158 LOG_WARNING("could not read product string for device 0x%04x:0x%04x: %s",
159 dev_desc
.idVendor
, dev_desc
.idProduct
, libusb_strerror(err
));
160 } else if (strstr(product_string
, "CMSIS-DAP")) {
161 LOG_DEBUG("found product string of 0x%04x:0x%04x '%s'",
162 dev_desc
.idVendor
, dev_desc
.idProduct
, product_string
);
163 cmsis_dap_in_product_str
= true;
167 bool device_identified_reliably
= cmsis_dap_in_product_str
168 || serial_match
|| id_match
;
170 /* Find the CMSIS-DAP interface */
172 for (int config
= 0; config
< dev_desc
.bNumConfigurations
; config
++) {
173 struct libusb_config_descriptor
*config_desc
;
174 err
= libusb_get_config_descriptor(dev
, config
, &config_desc
);
176 LOG_ERROR("could not get configuration descriptor %d for device 0x%04x:0x%04x: %s",
177 config
, dev_desc
.idVendor
, dev_desc
.idProduct
, libusb_strerror(err
));
181 LOG_DEBUG("enumerating interfaces of 0x%04x:0x%04x",
182 dev_desc
.idVendor
, dev_desc
.idProduct
);
183 int config_num
= config_desc
->bConfigurationValue
;
184 const struct libusb_interface_descriptor
*intf_desc_candidate
= NULL
;
185 const struct libusb_interface_descriptor
*intf_desc_found
= NULL
;
187 for (int interface
= 0; interface
< config_desc
->bNumInterfaces
; interface
++) {
188 const struct libusb_interface_descriptor
*intf_desc
= &config_desc
->interface
[interface
].altsetting
[0];
189 int interface_num
= intf_desc
->bInterfaceNumber
;
191 /* Skip this interface if another one was requested explicitly */
192 if (cmsis_dap_usb_interface
!= -1 && cmsis_dap_usb_interface
!= interface_num
)
195 /* CMSIS-DAP v2 spec says:
197 * CMSIS-DAP with default V2 configuration uses WinUSB and is therefore faster.
198 * Optionally support for streaming SWO trace is provided via an additional USB endpoint.
200 * The WinUSB configuration requires custom class support with the interface setting
201 * Class Code: 0xFF (Vendor specific)
203 * Protocol code: 0x00
205 * Depending on the configuration it uses the following USB endpoints which should be configured
206 * in the interface descriptor in this order:
207 * - Endpoint 1: Bulk Out ā used for commands received from host PC.
208 * - Endpoint 2: Bulk In ā used for responses send to host PC.
209 * - Endpoint 3: Bulk In (optional) ā used for streaming SWO trace (if enabled with SWO_STREAM).
212 /* Search for "CMSIS-DAP" in the interface string */
213 bool cmsis_dap_in_interface_str
= false;
214 if (intf_desc
->iInterface
!= 0) {
216 char interface_str
[256] = {0};
218 err
= libusb_get_string_descriptor_ascii(
219 dev_handle
, intf_desc
->iInterface
,
220 (uint8_t *)interface_str
, sizeof(interface_str
));
222 LOG_DEBUG("could not read interface string %d for device 0x%04x:0x%04x: %s",
223 intf_desc
->iInterface
,
224 dev_desc
.idVendor
, dev_desc
.idProduct
,
225 libusb_strerror(err
));
226 } else if (strstr(interface_str
, "CMSIS-DAP")) {
227 cmsis_dap_in_interface_str
= true;
228 LOG_DEBUG("found interface %d string '%s'",
229 interface_num
, interface_str
);
233 /* Bypass the following check if this interface was explicitly requested. */
234 if (cmsis_dap_usb_interface
== -1) {
235 if (!cmsis_dap_in_product_str
&& !cmsis_dap_in_interface_str
)
239 /* check endpoints */
240 if (intf_desc
->bNumEndpoints
< 2) {
241 LOG_DEBUG("skipping interface %d, has only %d endpoints",
242 interface_num
, intf_desc
->bNumEndpoints
);
246 if ((intf_desc
->endpoint
[0].bmAttributes
& 3) != LIBUSB_TRANSFER_TYPE_BULK
||
247 (intf_desc
->endpoint
[0].bEndpointAddress
& 0x80) != LIBUSB_ENDPOINT_OUT
) {
248 LOG_DEBUG("skipping interface %d, endpoint[0] is not bulk out",
253 if ((intf_desc
->endpoint
[1].bmAttributes
& 3) != LIBUSB_TRANSFER_TYPE_BULK
||
254 (intf_desc
->endpoint
[1].bEndpointAddress
& 0x80) != LIBUSB_ENDPOINT_IN
) {
255 LOG_DEBUG("skipping interface %d, endpoint[1] is not bulk in",
260 /* We can rely on the interface is really CMSIS-DAP if
261 * - we've seen CMSIS-DAP in the interface string
262 * - config asked explicitly for an interface number
263 * - the device has only one interface
264 * The later two cases should be honored only if we know
265 * we are on the rigt device */
266 bool intf_identified_reliably
= cmsis_dap_in_interface_str
267 || (device_identified_reliably
&&
268 (cmsis_dap_usb_interface
!= -1
269 || config_desc
->bNumInterfaces
== 1));
271 if (intf_desc
->bInterfaceClass
!= LIBUSB_CLASS_VENDOR_SPEC
||
272 intf_desc
->bInterfaceSubClass
!= 0 || intf_desc
->bInterfaceProtocol
!= 0) {
273 /* If the interface is reliably identified
274 * then we need not insist on setting USB class, subclass and protocol
275 * exactly as the specification requires.
276 * At least KitProg3 uses class 0 contrary to the specification */
277 if (intf_identified_reliably
) {
278 LOG_WARNING("Using CMSIS-DAPv2 interface %d with wrong class %" PRId8
279 " subclass %" PRId8
" or protocol %" PRId8
,
281 intf_desc
->bInterfaceClass
,
282 intf_desc
->bInterfaceSubClass
,
283 intf_desc
->bInterfaceProtocol
);
285 LOG_DEBUG("skipping interface %d, class %" PRId8
286 " subclass %" PRId8
" protocol %" PRId8
,
288 intf_desc
->bInterfaceClass
,
289 intf_desc
->bInterfaceSubClass
,
290 intf_desc
->bInterfaceProtocol
);
296 if (intf_identified_reliably
) {
297 /* That's the one! */
298 intf_desc_found
= intf_desc
;
302 if (!intf_desc_candidate
&& device_identified_reliably
) {
303 /* This interface looks suitable for CMSIS-DAP. Store the pointer to it
304 * and keep searching for another one with CMSIS-DAP in interface string */
305 intf_desc_candidate
= intf_desc
;
309 if (!intf_desc_found
) {
310 /* We were not able to identify reliably which interface is CMSIS-DAP.
311 * Let's use the first suitable if we found one */
312 intf_desc_found
= intf_desc_candidate
;
315 if (!intf_desc_found
) {
316 libusb_free_config_descriptor(config_desc
);
320 /* We've chosen an interface, connect to it */
321 int interface_num
= intf_desc_found
->bInterfaceNumber
;
322 int packet_size
= intf_desc_found
->endpoint
[0].wMaxPacketSize
;
323 int ep_out
= intf_desc_found
->endpoint
[0].bEndpointAddress
;
324 int ep_in
= intf_desc_found
->endpoint
[1].bEndpointAddress
;
326 libusb_free_config_descriptor(config_desc
);
327 libusb_free_device_list(device_list
, true);
329 LOG_INFO("Using CMSIS-DAPv2 interface with VID:PID=0x%04x:0x%04x, serial=%s",
330 dev_desc
.idVendor
, dev_desc
.idProduct
, dev_serial
);
333 err
= libusb_get_configuration(dev_handle
, ¤t_config
);
335 LOG_ERROR("could not find current configuration: %s", libusb_strerror(err
));
336 libusb_close(dev_handle
);
341 if (config_num
!= current_config
) {
342 err
= libusb_set_configuration(dev_handle
, config_num
);
344 LOG_ERROR("could not set configuration: %s", libusb_strerror(err
));
345 libusb_close(dev_handle
);
351 err
= libusb_claim_interface(dev_handle
, interface_num
);
353 LOG_WARNING("could not claim interface: %s", libusb_strerror(err
));
355 dap
->bdata
= malloc(sizeof(struct cmsis_dap_backend_data
));
356 if (dap
->bdata
== NULL
) {
357 LOG_ERROR("unable to allocate memory");
358 libusb_release_interface(dev_handle
, interface_num
);
359 libusb_close(dev_handle
);
364 dap
->packet_size
= packet_size
;
365 dap
->packet_buffer_size
= packet_size
;
366 dap
->bdata
->usb_ctx
= ctx
;
367 dap
->bdata
->dev_handle
= dev_handle
;
368 dap
->bdata
->ep_out
= ep_out
;
369 dap
->bdata
->ep_in
= ep_in
;
370 dap
->bdata
->interface
= interface_num
;
372 dap
->packet_buffer
= malloc(dap
->packet_buffer_size
);
373 if (dap
->packet_buffer
== NULL
) {
374 LOG_ERROR("unable to allocate memory");
375 cmsis_dap_usb_close(dap
);
379 dap
->command
= dap
->packet_buffer
;
380 dap
->response
= dap
->packet_buffer
;
385 libusb_close(dev_handle
);
388 libusb_free_device_list(device_list
, true);
394 static void cmsis_dap_usb_close(struct cmsis_dap
*dap
)
396 libusb_release_interface(dap
->bdata
->dev_handle
, dap
->bdata
->interface
);
397 libusb_close(dap
->bdata
->dev_handle
);
398 libusb_exit(dap
->bdata
->usb_ctx
);
401 free(dap
->packet_buffer
);
402 dap
->packet_buffer
= NULL
;
405 static int cmsis_dap_usb_read(struct cmsis_dap
*dap
, int timeout_ms
)
410 err
= libusb_bulk_transfer(dap
->bdata
->dev_handle
, dap
->bdata
->ep_in
,
411 dap
->packet_buffer
, dap
->packet_size
, &transferred
, timeout_ms
);
413 if (err
== LIBUSB_ERROR_TIMEOUT
) {
414 return ERROR_TIMEOUT_REACHED
;
416 LOG_ERROR("error reading data: %s", libusb_strerror(err
));
421 memset(&dap
->packet_buffer
[transferred
], 0, dap
->packet_buffer_size
- transferred
);
426 static int cmsis_dap_usb_write(struct cmsis_dap
*dap
, int txlen
, int timeout_ms
)
431 /* skip the first byte that is only used by the HID backend */
432 err
= libusb_bulk_transfer(dap
->bdata
->dev_handle
, dap
->bdata
->ep_out
,
433 dap
->packet_buffer
, txlen
, &transferred
, timeout_ms
);
435 if (err
== LIBUSB_ERROR_TIMEOUT
) {
436 return ERROR_TIMEOUT_REACHED
;
438 LOG_ERROR("error writing data: %s", libusb_strerror(err
));
446 static int cmsis_dap_usb_alloc(struct cmsis_dap
*dap
, unsigned int pkt_sz
)
448 uint8_t *buf
= malloc(pkt_sz
);
450 LOG_ERROR("unable to allocate CMSIS-DAP packet buffer");
454 dap
->packet_buffer
= buf
;
455 dap
->packet_size
= pkt_sz
;
456 dap
->packet_buffer_size
= pkt_sz
;
458 dap
->command
= dap
->packet_buffer
;
459 dap
->response
= dap
->packet_buffer
;
464 COMMAND_HANDLER(cmsis_dap_handle_usb_interface_command
)
467 cmsis_dap_usb_interface
= strtoul(CMD_ARGV
[0], NULL
, 10);
469 LOG_ERROR("expected exactly one argument to cmsis_dap_usb_interface <interface_number>");
474 const struct command_registration cmsis_dap_usb_subcommand_handlers
[] = {
477 .handler
= &cmsis_dap_handle_usb_interface_command
,
478 .mode
= COMMAND_CONFIG
,
479 .help
= "set the USB interface number to use (for USB bulk backend only)",
480 .usage
= "<interface_number>",
482 COMMAND_REGISTRATION_DONE
485 const struct cmsis_dap_backend cmsis_dap_usb_backend
= {
487 .open
= cmsis_dap_usb_open
,
488 .close
= cmsis_dap_usb_close
,
489 .read
= cmsis_dap_usb_read
,
490 .write
= cmsis_dap_usb_write
,
491 .packet_buffer_alloc
= cmsis_dap_usb_alloc
,
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