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/***************************************************************************
* Copyright (C) 2018 by Mickaël Thomas *
* mickael9@gmail.com *
* *
* Copyright (C) 2016 by Maksym Hilliaka *
* oter@frozen-team.com *
* *
* Copyright (C) 2016 by Phillip Pearson *
* pp@myelin.co.nz *
* *
* Copyright (C) 2014 by Paul Fertser *
* fercerpav@gmail.com *
* *
* Copyright (C) 2013 by mike brown *
* mike@theshedworks.org.uk *
* *
* Copyright (C) 2013 by Spencer Oliver *
* spen@spen-soft.co.uk *
* *
* 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, see <http://www.gnu.org/licenses/>. *
***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <hidapi.h>
#include <helper/log.h>
#include "cmsis_dap.h"
struct cmsis_dap_backend_data {
hid_device *dev_handle;
};
static void cmsis_dap_hid_close(struct cmsis_dap *dap);
static int cmsis_dap_hid_alloc(struct cmsis_dap *dap, unsigned int pkt_sz);
static int cmsis_dap_hid_open(struct cmsis_dap *dap, uint16_t vids[], uint16_t pids[], char *serial)
{
hid_device *dev = NULL;
int i;
struct hid_device_info *devs, *cur_dev;
unsigned short target_vid, target_pid;
target_vid = 0;
target_pid = 0;
if (hid_init() != 0) {
LOG_ERROR("unable to open HIDAPI");
return ERROR_FAIL;
}
/*
* The CMSIS-DAP specification stipulates:
* "The Product String must contain "CMSIS-DAP" somewhere in the string. This is used by the
* debuggers to identify a CMSIS-DAP compliant Debug Unit that is connected to a host computer."
*/
devs = hid_enumerate(0x0, 0x0);
cur_dev = devs;
while (cur_dev) {
bool found = false;
if (0 == vids[0]) {
if (!cur_dev->product_string) {
LOG_DEBUG("Cannot read product string of device 0x%x:0x%x",
cur_dev->vendor_id, cur_dev->product_id);
} else if (wcsstr(cur_dev->product_string, L"CMSIS-DAP")) {
/* if the user hasn't specified VID:PID *and*
* product string contains "CMSIS-DAP", pick it
*/
found = true;
}
} else {
/* otherwise, exhaustively compare against all VID:PID in list */
for (i = 0; vids[i] || pids[i]; i++) {
if ((vids[i] == cur_dev->vendor_id) && (pids[i] == cur_dev->product_id))
found = true;
}
}
/* LPC-LINK2 has cmsis-dap on interface 0 and other HID functions on other interfaces */
if (cur_dev->vendor_id == 0x1fc9 && cur_dev->product_id == 0x0090 && cur_dev->interface_number != 0)
found = false;
if (found) {
/* check serial number matches if given */
if (!serial)
break;
if (cur_dev->serial_number) {
size_t len = (strlen(serial) + 1) * sizeof(wchar_t);
wchar_t *wserial = malloc(len);
mbstowcs(wserial, serial, len);
if (wcscmp(wserial, cur_dev->serial_number) == 0) {
free(wserial);
break;
} else {
free(wserial);
wserial = NULL;
}
}
}
cur_dev = cur_dev->next;
}
if (cur_dev) {
target_vid = cur_dev->vendor_id;
target_pid = cur_dev->product_id;
}
if (target_vid == 0 && target_pid == 0) {
hid_free_enumeration(devs);
return ERROR_FAIL;
}
dap->bdata = malloc(sizeof(struct cmsis_dap_backend_data));
if (!dap->bdata) {
LOG_ERROR("unable to allocate memory");
return ERROR_FAIL;
}
dev = hid_open_path(cur_dev->path);
hid_free_enumeration(devs);
if (!dev) {
LOG_ERROR("unable to open CMSIS-DAP device 0x%x:0x%x", target_vid, target_pid);
return ERROR_FAIL;
}
/* allocate default packet buffer, may be changed later.
* currently with HIDAPI we have no way of getting the output report length
* without this info we cannot communicate with the adapter.
* For the moment we have to hard code the packet size */
unsigned int packet_size = 64;
/* atmel cmsis-dap uses 512 byte reports */
/* except when it doesn't e.g. with mEDBG on SAMD10 Xplained
* board */
/* TODO: HID report descriptor should be parsed instead of
* hardcoding a match by VID */
if (target_vid == 0x03eb && target_pid != 0x2145 && target_pid != 0x2175)
packet_size = 512;
dap->bdata->dev_handle = dev;
int retval = cmsis_dap_hid_alloc(dap, packet_size);
if (retval != ERROR_OK) {
cmsis_dap_hid_close(dap);
return ERROR_FAIL;
}
dap->command = dap->packet_buffer + REPORT_ID_SIZE;
dap->response = dap->packet_buffer;
return ERROR_OK;
}
static void cmsis_dap_hid_close(struct cmsis_dap *dap)
{
hid_close(dap->bdata->dev_handle);
hid_exit();
free(dap->bdata);
dap->bdata = NULL;
free(dap->packet_buffer);
dap->packet_buffer = NULL;
}
static int cmsis_dap_hid_read(struct cmsis_dap *dap, int timeout_ms)
{
int retval = hid_read_timeout(dap->bdata->dev_handle, dap->packet_buffer, dap->packet_buffer_size, timeout_ms);
if (retval == 0) {
return ERROR_TIMEOUT_REACHED;
} else if (retval == -1) {
LOG_ERROR("error reading data: %ls", hid_error(dap->bdata->dev_handle));
return ERROR_FAIL;
}
return retval;
}
static int cmsis_dap_hid_write(struct cmsis_dap *dap, int txlen, int timeout_ms)
{
(void) timeout_ms;
dap->packet_buffer[0] = 0; /* HID report number */
/* Pad the rest of the TX buffer with 0's */
memset(dap->command + txlen, 0, dap->packet_size - txlen);
/* write data to device */
int retval = hid_write(dap->bdata->dev_handle, dap->packet_buffer, dap->packet_buffer_size);
if (retval == -1) {
LOG_ERROR("error writing data: %ls", hid_error(dap->bdata->dev_handle));
return ERROR_FAIL;
}
return retval;
}
static int cmsis_dap_hid_alloc(struct cmsis_dap *dap, unsigned int pkt_sz)
{
unsigned int packet_buffer_size = pkt_sz + REPORT_ID_SIZE;
uint8_t *buf = malloc(packet_buffer_size);
if (!buf) {
LOG_ERROR("unable to allocate CMSIS-DAP packet buffer");
return ERROR_FAIL;
}
dap->packet_buffer = buf;
dap->packet_size = pkt_sz;
dap->packet_buffer_size = packet_buffer_size;
dap->command = dap->packet_buffer + REPORT_ID_SIZE;
dap->response = dap->packet_buffer;
return ERROR_OK;
}
const struct cmsis_dap_backend cmsis_dap_hid_backend = {
.name = "hid",
.open = cmsis_dap_hid_open,
.close = cmsis_dap_hid_close,
.read = cmsis_dap_hid_read,
.write = cmsis_dap_hid_write,
.packet_buffer_alloc = cmsis_dap_hid_alloc,
};
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