/* Match VID/PID */
- bool id_match = true; /* match if we don't enter the loop (no filter) */
+ bool id_match = false;
+ bool id_filter = vids[0] || pids[0];
for (int id = 0; vids[id] || pids[id]; id++) {
id_match = !vids[id] || dev_desc.idVendor == vids[id];
id_match &= !pids[id] || dev_desc.idProduct == pids[id];
break;
}
- if (!id_match)
+ if (id_filter && !id_match)
continue;
/* Don't continue if we asked for a serial number and the device doesn't have one */
/* It's to be expected that most USB devices can't be opened
* so only report an error if it was explicitly selected
*/
- if (vids[0] || pids[0]) {
+ if (id_filter) {
LOG_ERROR("could not open device 0x%04x:0x%04x: %s",
dev_desc.idVendor, dev_desc.idProduct, libusb_strerror(err));
} else {
/* Match serial number */
- bool serial_match = (serial == NULL);
+ bool serial_match = false;
char dev_serial[256] = {0};
if (dev_desc.iSerialNumber > 0) {
err = libusb_get_string_descriptor_ascii(
(uint8_t *)dev_serial, sizeof(dev_serial));
if (err < 0) {
- LOG_ERROR("could not read serial number for device 0x%04x:0x%04x: %s",
- dev_desc.idVendor, dev_desc.idProduct, libusb_strerror(err));
+ const char *msg = "could not read serial number for device 0x%04x:0x%04x: %s";
+ if (serial)
+ LOG_WARNING(msg, dev_desc.idVendor, dev_desc.idProduct,
+ libusb_strerror(err));
+ else
+ LOG_DEBUG(msg, dev_desc.idVendor, dev_desc.idProduct,
+ libusb_strerror(err));
} else if (serial && strncmp(dev_serial, serial, sizeof(dev_serial)) == 0) {
serial_match = true;
}
}
- if (!serial_match) {
+ if (serial && !serial_match) {
libusb_close(dev_handle);
continue;
}
/* Find the CMSIS-DAP string in product string */
- bool cmsis_dap_found = false;
+ bool cmsis_dap_in_product_str = false;
char product_string[256] = {0};
if (dev_desc.iProduct > 0) {
err = libusb_get_string_descriptor_ascii(
dev_handle, dev_desc.iProduct,
(uint8_t *)product_string, sizeof(product_string));
if (err < 0) {
- LOG_ERROR("could not read product string for device 0x%04x:0x%04x: %s",
+ LOG_WARNING("could not read product string for device 0x%04x:0x%04x: %s",
dev_desc.idVendor, dev_desc.idProduct, libusb_strerror(err));
} else if (strstr(product_string, "CMSIS-DAP")) {
- LOG_DEBUG("CMSIS-DAP found in product string");
- cmsis_dap_found = true;
+ LOG_DEBUG("found product string of 0x%04x:0x%04x '%s'",
+ dev_desc.idVendor, dev_desc.idProduct, product_string);
+ cmsis_dap_in_product_str = true;
}
}
+ bool device_identified_reliably = cmsis_dap_in_product_str
+ || serial_match || id_match;
+
/* Find the CMSIS-DAP interface */
for (int config = 0; config < dev_desc.bNumConfigurations; config++) {
continue;
}
+ LOG_DEBUG("enumerating interfaces of 0x%04x:0x%04x",
+ dev_desc.idVendor, dev_desc.idProduct);
int config_num = config_desc->bConfigurationValue;
+ const struct libusb_interface_descriptor *intf_desc_candidate = NULL;
+ const struct libusb_interface_descriptor *intf_desc_found = NULL;
for (int interface = 0; interface < config_desc->bNumInterfaces; interface++) {
const struct libusb_interface_descriptor *intf_desc = &config_desc->interface[interface].altsetting[0];
* - Endpoint 3: Bulk In (optional) – used for streaming SWO trace (if enabled with SWO_STREAM).
*/
- if (intf_desc->bNumEndpoints < 2)
+ /* Search for "CMSIS-DAP" in the interface string */
+ bool cmsis_dap_in_interface_str = false;
+ if (intf_desc->iInterface != 0) {
+
+ char interface_str[256] = {0};
+
+ err = libusb_get_string_descriptor_ascii(
+ dev_handle, intf_desc->iInterface,
+ (uint8_t *)interface_str, sizeof(interface_str));
+ if (err < 0) {
+ LOG_DEBUG("could not read interface string %d for device 0x%04x:0x%04x: %s",
+ intf_desc->iInterface,
+ dev_desc.idVendor, dev_desc.idProduct,
+ libusb_strerror(err));
+ } else if (strstr(interface_str, "CMSIS-DAP")) {
+ cmsis_dap_in_interface_str = true;
+ LOG_DEBUG("found interface %d string '%s'",
+ interface_num, interface_str);
+ }
+ }
+
+ /* Bypass the following check if this interface was explicitly requested. */
+ if (cmsis_dap_usb_interface == -1) {
+ if (!cmsis_dap_in_product_str && !cmsis_dap_in_interface_str)
+ continue;
+ }
+
+ /* check endpoints */
+ if (intf_desc->bNumEndpoints < 2) {
+ LOG_DEBUG("skipping interface %d, has only %d endpoints",
+ interface_num, intf_desc->bNumEndpoints);
continue;
+ }
if ((intf_desc->endpoint[0].bmAttributes & 3) != LIBUSB_TRANSFER_TYPE_BULK ||
- (intf_desc->endpoint[0].bEndpointAddress & 0x80) != LIBUSB_ENDPOINT_OUT)
+ (intf_desc->endpoint[0].bEndpointAddress & 0x80) != LIBUSB_ENDPOINT_OUT) {
+ LOG_DEBUG("skipping interface %d, endpoint[0] is not bulk out",
+ interface_num);
continue;
+ }
if ((intf_desc->endpoint[1].bmAttributes & 3) != LIBUSB_TRANSFER_TYPE_BULK ||
- (intf_desc->endpoint[1].bEndpointAddress & 0x80) != LIBUSB_ENDPOINT_IN)
+ (intf_desc->endpoint[1].bEndpointAddress & 0x80) != LIBUSB_ENDPOINT_IN) {
+ LOG_DEBUG("skipping interface %d, endpoint[1] is not bulk in",
+ interface_num);
continue;
+ }
- /* Bypass the following checks if this interface was explicitly requested. */
- if (cmsis_dap_usb_interface == -1) {
- if (intf_desc->bInterfaceClass != LIBUSB_CLASS_VENDOR_SPEC ||
- intf_desc->bInterfaceSubClass != 0 || intf_desc->bInterfaceProtocol != 0)
+ /* We can rely on the interface is really CMSIS-DAP if
+ * - we've seen CMSIS-DAP in the interface string
+ * - config asked explicitly for an interface number
+ * - the device has only one interface
+ * The later two cases should be honored only if we know
+ * we are on the rigt device */
+ bool intf_identified_reliably = cmsis_dap_in_interface_str
+ || (device_identified_reliably &&
+ (cmsis_dap_usb_interface != -1
+ || config_desc->bNumInterfaces == 1));
+
+ if (intf_desc->bInterfaceClass != LIBUSB_CLASS_VENDOR_SPEC ||
+ intf_desc->bInterfaceSubClass != 0 || intf_desc->bInterfaceProtocol != 0) {
+ /* If the interface is reliably identified
+ * then we need not insist on setting USB class, subclass and protocol
+ * exactly as the specification requires.
+ * At least KitProg3 uses class 0 contrary to the specification */
+ if (intf_identified_reliably) {
+ LOG_WARNING("Using CMSIS-DAPv2 interface %d with wrong class %" PRId8
+ " subclass %" PRId8 " or protocol %" PRId8,
+ interface_num,
+ intf_desc->bInterfaceClass,
+ intf_desc->bInterfaceSubClass,
+ intf_desc->bInterfaceProtocol);
+ } else {
+ LOG_DEBUG("skipping interface %d, class %" PRId8
+ " subclass %" PRId8 " protocol %" PRId8,
+ interface_num,
+ intf_desc->bInterfaceClass,
+ intf_desc->bInterfaceSubClass,
+ intf_desc->bInterfaceProtocol);
continue;
- /* Search for "CMSIS-DAP" in the interface string */
- if (cmsis_dap_usb_interface != -1 && !cmsis_dap_found) {
- if (intf_desc->iInterface == 0)
- continue;
-
- char interface_str[256] = {0};
-
- err = libusb_get_string_descriptor_ascii(
- dev_handle, intf_desc->iInterface,
- (uint8_t *)interface_str, sizeof(interface_str));
- if (err < 0) {
- LOG_ERROR("could not read interface string for device 0x%04x:0x%04x: %s",
- dev_desc.idVendor, dev_desc.idProduct, libusb_strerror(err));
- continue;
- } else if (!strstr(interface_str, "CMSIS-DAP")) {
- continue;
- } else {
- LOG_DEBUG("CMSIS-DAP found in interface string");
- }
}
}
- int packet_size = intf_desc->endpoint[0].wMaxPacketSize;
- int ep_out = intf_desc->endpoint[0].bEndpointAddress;
- int ep_in = intf_desc->endpoint[1].bEndpointAddress;
+ if (intf_identified_reliably) {
+ /* That's the one! */
+ intf_desc_found = intf_desc;
+ break;
+ }
+
+ if (!intf_desc_candidate && device_identified_reliably) {
+ /* This interface looks suitable for CMSIS-DAP. Store the pointer to it
+ * and keep searching for another one with CMSIS-DAP in interface string */
+ intf_desc_candidate = intf_desc;
+ }
+ }
+
+ if (!intf_desc_found) {
+ /* We were not able to identify reliably which interface is CMSIS-DAP.
+ * Let's use the first suitable if we found one */
+ intf_desc_found = intf_desc_candidate;
+ }
- /* That's the one! */
+ if (!intf_desc_found) {
libusb_free_config_descriptor(config_desc);
- libusb_free_device_list(device_list, true);
+ continue;
+ }
- LOG_INFO("Using CMSIS-DAPv2 interface with VID:PID=0x%04x:0x%04x, serial=%s",
- dev_desc.idVendor, dev_desc.idProduct, dev_serial);
+ /* We've chosen an interface, connect to it */
+ int interface_num = intf_desc_found->bInterfaceNumber;
+ int packet_size = intf_desc_found->endpoint[0].wMaxPacketSize;
+ int ep_out = intf_desc_found->endpoint[0].bEndpointAddress;
+ int ep_in = intf_desc_found->endpoint[1].bEndpointAddress;
- int current_config;
- err = libusb_get_configuration(dev_handle, ¤t_config);
- if (err) {
- LOG_ERROR("could not find current configuration: %s", libusb_strerror(err));
- libusb_close(dev_handle);
- libusb_exit(ctx);
- return ERROR_FAIL;
- }
+ libusb_free_config_descriptor(config_desc);
+ libusb_free_device_list(device_list, true);
- if (config_num != current_config) {
- err = libusb_set_configuration(dev_handle, config_num);
- if (err) {
- LOG_ERROR("could not set configuration: %s", libusb_strerror(err));
- libusb_close(dev_handle);
- libusb_exit(ctx);
- return ERROR_FAIL;
- }
- }
+ LOG_INFO("Using CMSIS-DAPv2 interface with VID:PID=0x%04x:0x%04x, serial=%s",
+ dev_desc.idVendor, dev_desc.idProduct, dev_serial);
- err = libusb_claim_interface(dev_handle, interface_num);
- if (err)
- LOG_WARNING("could not claim interface: %s", libusb_strerror(err));
+ int current_config;
+ err = libusb_get_configuration(dev_handle, ¤t_config);
+ if (err) {
+ LOG_ERROR("could not find current configuration: %s", libusb_strerror(err));
+ libusb_close(dev_handle);
+ libusb_exit(ctx);
+ return ERROR_FAIL;
+ }
- dap->bdata = malloc(sizeof(struct cmsis_dap_backend_data));
- if (dap->bdata == NULL) {
- LOG_ERROR("unable to allocate memory");
- libusb_release_interface(dev_handle, interface_num);
+ if (config_num != current_config) {
+ err = libusb_set_configuration(dev_handle, config_num);
+ if (err) {
+ LOG_ERROR("could not set configuration: %s", libusb_strerror(err));
libusb_close(dev_handle);
libusb_exit(ctx);
return ERROR_FAIL;
}
+ }
- dap->packet_size = packet_size + 1; /* "+ 1" for compatibility with the HID backend */
- dap->bdata->usb_ctx = ctx;
- dap->bdata->dev_handle = dev_handle;
- dap->bdata->ep_out = ep_out;
- dap->bdata->ep_in = ep_in;
- dap->bdata->interface = interface_num;
- return ERROR_OK;
+ err = libusb_claim_interface(dev_handle, interface_num);
+ if (err)
+ LOG_WARNING("could not claim interface: %s", libusb_strerror(err));
+
+ dap->bdata = malloc(sizeof(struct cmsis_dap_backend_data));
+ if (dap->bdata == NULL) {
+ LOG_ERROR("unable to allocate memory");
+ libusb_release_interface(dev_handle, interface_num);
+ libusb_close(dev_handle);
+ libusb_exit(ctx);
+ return ERROR_FAIL;
}
- libusb_free_config_descriptor(config_desc);
+ dap->packet_size = packet_size + 1; /* "+ 1" for compatibility with the HID backend */
+ dap->bdata->usb_ctx = ctx;
+ dap->bdata->dev_handle = dev_handle;
+ dap->bdata->ep_out = ep_out;
+ dap->bdata->ep_in = ep_in;
+ dap->bdata->interface = interface_num;
+ return ERROR_OK;
}
libusb_close(dev_handle);
projects / fw / openocd / blobdiff