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 ***************************************************************************/
39 #include <helper/log.h>
41 #include "cmsis_dap.h"
43 struct cmsis_dap_backend_data
{
44 hid_device
*dev_handle
;
47 static void cmsis_dap_hid_close(struct cmsis_dap
*dap
);
48 static int cmsis_dap_hid_alloc(struct cmsis_dap
*dap
, unsigned int pkt_sz
);
50 static int cmsis_dap_hid_open(struct cmsis_dap
*dap
, uint16_t vids
[], uint16_t pids
[], char *serial
)
52 hid_device
*dev
= NULL
;
54 struct hid_device_info
*devs
, *cur_dev
;
55 unsigned short target_vid
, target_pid
;
60 if (hid_init() != 0) {
61 LOG_ERROR("unable to open HIDAPI");
66 * The CMSIS-DAP specification stipulates:
67 * "The Product String must contain "CMSIS-DAP" somewhere in the string. This is used by the
68 * debuggers to identify a CMSIS-DAP compliant Debug Unit that is connected to a host computer."
70 devs
= hid_enumerate(0x0, 0x0);
72 while (NULL
!= cur_dev
) {
76 if (NULL
== cur_dev
->product_string
) {
77 LOG_DEBUG("Cannot read product string of device 0x%x:0x%x",
78 cur_dev
->vendor_id
, cur_dev
->product_id
);
79 } else if (wcsstr(cur_dev
->product_string
, L
"CMSIS-DAP")) {
80 /* if the user hasn't specified VID:PID *and*
81 * product string contains "CMSIS-DAP", pick it
86 /* otherwise, exhaustively compare against all VID:PID in list */
87 for (i
= 0; vids
[i
] || pids
[i
]; i
++) {
88 if ((vids
[i
] == cur_dev
->vendor_id
) && (pids
[i
] == cur_dev
->product_id
))
93 /* LPC-LINK2 has cmsis-dap on interface 0 and other HID functions on other interfaces */
94 if (cur_dev
->vendor_id
== 0x1fc9 && cur_dev
->product_id
== 0x0090 && cur_dev
->interface_number
!= 0)
98 /* check serial number matches if given */
102 if (cur_dev
->serial_number
!= NULL
) {
103 size_t len
= (strlen(serial
) + 1) * sizeof(wchar_t);
104 wchar_t *wserial
= malloc(len
);
105 mbstowcs(wserial
, serial
, len
);
107 if (wcscmp(wserial
, cur_dev
->serial_number
) == 0) {
117 cur_dev
= cur_dev
->next
;
120 if (NULL
!= cur_dev
) {
121 target_vid
= cur_dev
->vendor_id
;
122 target_pid
= cur_dev
->product_id
;
125 if (target_vid
== 0 && target_pid
== 0) {
126 hid_free_enumeration(devs
);
130 dap
->bdata
= malloc(sizeof(struct cmsis_dap_backend_data
));
131 if (dap
->bdata
== NULL
) {
132 LOG_ERROR("unable to allocate memory");
136 dev
= hid_open_path(cur_dev
->path
);
137 hid_free_enumeration(devs
);
140 LOG_ERROR("unable to open CMSIS-DAP device 0x%x:0x%x", target_vid
, target_pid
);
144 /* allocate default packet buffer, may be changed later.
145 * currently with HIDAPI we have no way of getting the output report length
146 * without this info we cannot communicate with the adapter.
147 * For the moment we have to hard code the packet size */
149 unsigned int packet_size
= 64;
151 /* atmel cmsis-dap uses 512 byte reports */
152 /* except when it doesn't e.g. with mEDBG on SAMD10 Xplained
154 /* TODO: HID report descriptor should be parsed instead of
155 * hardcoding a match by VID */
156 if (target_vid
== 0x03eb && target_pid
!= 0x2145 && target_pid
!= 0x2175)
159 dap
->bdata
->dev_handle
= dev
;
161 int retval
= cmsis_dap_hid_alloc(dap
, packet_size
);
162 if (retval
!= ERROR_OK
) {
163 cmsis_dap_hid_close(dap
);
167 dap
->command
= dap
->packet_buffer
+ REPORT_ID_SIZE
;
168 dap
->response
= dap
->packet_buffer
;
172 static void cmsis_dap_hid_close(struct cmsis_dap
*dap
)
174 hid_close(dap
->bdata
->dev_handle
);
178 free(dap
->packet_buffer
);
179 dap
->packet_buffer
= NULL
;
182 static int cmsis_dap_hid_read(struct cmsis_dap
*dap
, int timeout_ms
)
184 int retval
= hid_read_timeout(dap
->bdata
->dev_handle
, dap
->packet_buffer
, dap
->packet_buffer_size
, timeout_ms
);
187 return ERROR_TIMEOUT_REACHED
;
188 } else if (retval
== -1) {
189 LOG_ERROR("error reading data: %ls", hid_error(dap
->bdata
->dev_handle
));
196 static int cmsis_dap_hid_write(struct cmsis_dap
*dap
, int txlen
, int timeout_ms
)
200 dap
->packet_buffer
[0] = 0; /* HID report number */
202 /* Pad the rest of the TX buffer with 0's */
203 memset(dap
->command
+ txlen
, 0, dap
->packet_size
- txlen
);
205 /* write data to device */
206 int retval
= hid_write(dap
->bdata
->dev_handle
, dap
->packet_buffer
, dap
->packet_buffer_size
);
208 LOG_ERROR("error writing data: %ls", hid_error(dap
->bdata
->dev_handle
));
215 static int cmsis_dap_hid_alloc(struct cmsis_dap
*dap
, unsigned int pkt_sz
)
217 unsigned int packet_buffer_size
= pkt_sz
+ REPORT_ID_SIZE
;
218 uint8_t *buf
= malloc(packet_buffer_size
);
220 LOG_ERROR("unable to allocate CMSIS-DAP packet buffer");
224 dap
->packet_buffer
= buf
;
225 dap
->packet_size
= pkt_sz
;
226 dap
->packet_buffer_size
= packet_buffer_size
;
228 dap
->command
= dap
->packet_buffer
+ REPORT_ID_SIZE
;
229 dap
->response
= dap
->packet_buffer
;
234 const struct cmsis_dap_backend cmsis_dap_hid_backend
= {
236 .open
= cmsis_dap_hid_open
,
237 .close
= cmsis_dap_hid_close
,
238 .read
= cmsis_dap_hid_read
,
239 .write
= cmsis_dap_hid_write
,
240 .packet_buffer_alloc
= cmsis_dap_hid_alloc
,
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