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feat: add gs_usb support on Windows

Browse Source 
candleLight, CANable, CANnectivity and cantact adapters speak gs_usb. On
Linux and macOS the kernel driver exposes them as SocketCAN interfaces, so
SavvyCAN already reached them through Qt SerialBus. Windows has no such
driver, which left those adapters unusable there.

Add a GSUSBConnection that talks to the hardware directly over WinUSB:

- one connection per physical device, one SavvyCAN bus per CAN channel
- CAN FD including BRS, plus RTR, extended IDs and error frames
- known good bit timings for 16/48/80/160/170 MHz device clocks, with a
  generic solver for clocks the tables do not cover
- hardware timestamps, unwrapped across the 32 bit rollover and anchored
  to the host clock so they line up with the rest of SavvyCAN

gs_usb multiplexes every channel over a single USB bulk IN endpoint, so a
single reader thread drains it and hands frames to the connection thread in
batches, coalescing the wakeups. That keeps one producer on the lock free
queue, which the tx echo path already writes to.

Device scans skip adapters that a live connection holds. candle_dev_open()
shares the file handle and queues read URBs immediately, so probing a device
in use would consume frames the open connection is waiting for.

connections/candle_api is an unmodified copy of the candle Windows API, LGPL
3.0 rather than MIT and only compiled into Windows builds. See its README for
provenance.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XZnuZJ7zc3e8hk6C8bGDZN
This commit is contained in:
Refuhr
2026-07-29 09:25:32 +02:00
co-authored by Claude Opus 5
parent 30328f773a
commit 3ae429ae48
19 changed files with 3157 additions and 3 deletions
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connections/candle_api/LICENSE
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GNU LESSER GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright © 2007 Free Software Foundation, Inc. <http://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed.
This version of the GNU Lesser General Public License incorporates the terms and conditions of version 3 of the GNU General Public License, supplemented by the additional permissions listed below.
0. Additional Definitions.
As used herein, “this License” refers to version 3 of the GNU Lesser General Public License, and the “GNU GPL” refers to version 3 of the GNU General Public License.
“The Library” refers to a covered work governed by this License, other than an Application or a Combined Work as defined below.
An “Application” is any work that makes use of an interface provided by the Library, but which is not otherwise based on the Library. Defining a subclass of a class defined by the Library is deemed a mode of using an interface provided by the Library.
A “Combined Work” is a work produced by combining or linking an Application with the Library. The particular version of the Library with which the Combined Work was made is also called the “Linked Version”.
The “Minimal Corresponding Source” for a Combined Work means the Corresponding Source for the Combined Work, excluding any source code for portions of the Combined Work that, considered in isolation, are based on the Application, and not on the Linked Version.
The “Corresponding Application Code” for a Combined Work means the object code and/or source code for the Application, including any data and utility programs needed for reproducing the Combined Work from the Application, but excluding the System Libraries of the Combined Work.
1. Exception to Section 3 of the GNU GPL.
You may convey a covered work under sections 3 and 4 of this License without being bound by section 3 of the GNU GPL.
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If you modify a copy of the Library, and, in your modifications, a facility refers to a function or data to be supplied by an Application that uses the facility (other than as an argument passed when the facility is invoked), then you may convey a copy of the modified version:
a) under this License, provided that you make a good faith effort to ensure that, in the event an Application does not supply the function or data, the facility still operates, and performs whatever part of its purpose remains meaningful, or
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The object code form of an Application may incorporate material from a header file that is part of the Library. You may convey such object code under terms of your choice, provided that, if the incorporated material is not limited to numerical parameters, data structure layouts and accessors, or small macros, inline functions and templates (ten or fewer lines in length), you do both of the following:
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1) Use a suitable shared library mechanism for linking with the Library. A suitable mechanism is one that (a) uses at run time a copy of the Library already present on the user's computer system, and (b) will operate properly with a modified version of the Library that is interface-compatible with the Linked Version.
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connections/candle_api/README.md
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# candle API (gs_usb / candleLight Windows driver)
Vendored, unmodified copy of the candle Windows API used by SavvyCAN's gs_usb
connection (`connections/gs_usb.cpp`). It talks to gs_usb class devices
(candleLight, CANable, CANnectivity, cantact, ...) over WinUSB, so no vendor
driver is needed — only a WinUSB binding on the device interface (which the
stock candleLight/CANable firmware already declares via WCID descriptors).
## Provenance
- Original: <https://github.com/HubertD/candle_dll> — Copyright (c) 2016 Hubert Denkmair
- This copy: <https://github.com/Schildkroet/CANgaroo>, `src/driver/CandleApiDriver/api/`
at commit `ed3088d5393e02a01afe867af2ee8ab0e12db039`, which adds CAN FD,
multi-channel and hardware timestamp support — Copyright (c) 2026 Schildkroet
## License
These files are **LGPL-3.0**, not MIT like the rest of SavvyCAN. They are only
compiled into Windows builds. Keep `LICENSE` alongside them, and keep the files
separable so the LGPL relinking provision can be satisfied. Do not copy code out
of this directory into the MIT-licensed parts of the tree.
connections/candle_api/candle.c
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connections/candle_api/candle.h
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/*
Copyright (c) 2016 Hubert Denkmair <hubert@denkmair.de>
Copyright (c) 2026 Schildkroet
This file is part of the candle windows API.
This library is free software: you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation, either
version 3 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <stdint.h>
#include <stdbool.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef void* candle_list_handle;
typedef void* candle_handle;
typedef enum {
CANDLE_DEVSTATE_AVAIL,
CANDLE_DEVSTATE_INUSE
} candle_devstate_t;
typedef enum {
CANDLE_FRAMETYPE_UNKNOWN,
CANDLE_FRAMETYPE_RECEIVE,
CANDLE_FRAMETYPE_ECHO,
CANDLE_FRAMETYPE_ERROR,
CANDLE_FRAMETYPE_TIMESTAMP_OVFL
} candle_frametype_t;
enum {
CANDLE_ID_EXTENDED = 0x80000000,
CANDLE_ID_RTR = 0x40000000,
CANDLE_ID_ERR = 0x20000000
};
/* Feature flags reported in candle_capability_t.feature */
enum {
/** CAN channel supports listen-only mode, in which it is not allowed to send dominant bits. */
CANDLE_FEATURE_LISTEN_ONLY = 0x0001,
/** CAN channel supports loopback mode, in which it receives own frames. */
CANDLE_FEATURE_LOOP_BACK = 0x0002,
/** CAN channel supports triple sampling mode */
CANDLE_FEATURE_TRIPLE_SAMPLE = 0x0004,
/** CAN channel supports not retransmitting in case of lost arbitration or missing ACK. */
CANDLE_FEATURE_ONE_SHOT = 0x0008,
/** CAN channel supports hardware timestamping of CAN frames. */
CANDLE_FEATURE_HW_TIMESTAMP = 0x0010,
/** CAN channel supports visual identification. */
CANDLE_FEATURE_IDENTIFY = 0x0020,
/** CAN channel supports user IDs (unsupported). */
CANDLE_FEATURE_USER_ID = 0x0040,
/** CAN channel supports padding of host frames (unsupported). */
CANDLE_FEATURE_PAD_PKTS_TO_MAX = 0x0080,
/** CAN channel supports transmitting/receiving CAN FD frames. */
CANDLE_FEATURE_FD = 0x0100,
/** CAN channel support LPC546xx specific quirks (Unused) */
CANDLE_FEATURE_REQ_USB_QUIRK_LPC546XX = 0x0200,
/** CAN channel supports extended bit timing limits. */
CANDLE_FEATURE_BT_CONST_EXT = 0x0400,
/** CAN channel supports configurable bus termination. */
CANDLE_FEATURE_TERMINATION = 0x0800,
/** CAN channel supports bus error reporting (Unsupported, always enabled) */
CANDLE_FEATURE_BERR_REPORTING = 0x1000,
/** CAN channel supports reporting of bus state. */
CANDLE_FEATURE_GET_STATE = 0x2000,
};
/* Flags in the flags byte of received/transmitted frames */
enum {
CANDLE_FRAME_FLAG_OVERFLOW = 0x01,
CANDLE_FRAME_FLAG_FD = 0x02,
CANDLE_FRAME_FLAG_BRS = 0x04,
CANDLE_FRAME_FLAG_ESI = 0x08,
};
typedef enum {
CANDLE_STATE_ERROR_ACTIVE = 0,
CANDLE_STATE_ERROR_WARNING = 1,
CANDLE_STATE_ERROR_PASSIVE = 2,
CANDLE_STATE_BUS_OFF = 3,
CANDLE_STATE_STOPPED = 4,
CANDLE_STATE_SLEEPING = 5,
} candle_can_state_t;
typedef enum {
CANDLE_MODE_NORMAL = 0x0000,
CANDLE_MODE_LISTEN_ONLY = 0x0001,
CANDLE_MODE_LOOP_BACK = 0x0002,
CANDLE_MODE_TRIPLE_SAMPLE = 0x0004,
CANDLE_MODE_ONE_SHOT = 0x0008,
CANDLE_MODE_HW_TIMESTAMP = 0x0010,
CANDLE_MODE_PAD_PKTS_TO_MAX = 0x0080,
CANDLE_MODE_FD = 0x0100,
} candle_mode_t;
typedef enum {
CANDLE_ERR_OK = 0,
CANDLE_ERR_CREATE_FILE = 1,
CANDLE_ERR_WINUSB_INITIALIZE = 2,
CANDLE_ERR_QUERY_INTERFACE = 3,
CANDLE_ERR_QUERY_PIPE = 4,
CANDLE_ERR_PARSE_IF_DESCR = 5,
CANDLE_ERR_SET_HOST_FORMAT = 6,
CANDLE_ERR_GET_DEVICE_INFO = 7,
CANDLE_ERR_GET_BITTIMING_CONST = 8,
CANDLE_ERR_PREPARE_READ = 9,
CANDLE_ERR_SET_DEVICE_MODE = 10,
CANDLE_ERR_SET_BITTIMING = 11,
CANDLE_ERR_BITRATE_FCLK = 12,
CANDLE_ERR_BITRATE_UNSUPPORTED = 13,
CANDLE_ERR_SEND_FRAME = 14,
CANDLE_ERR_READ_TIMEOUT = 15,
CANDLE_ERR_READ_WAIT = 16,
CANDLE_ERR_READ_RESULT = 17,
CANDLE_ERR_READ_SIZE = 18,
CANDLE_ERR_SETUPDI_IF_DETAILS = 19,
CANDLE_ERR_SETUPDI_IF_DETAILS2 = 20,
CANDLE_ERR_MALLOC = 21,
CANDLE_ERR_PATH_LEN = 22,
CANDLE_ERR_CLSID = 23,
CANDLE_ERR_GET_DEVICES = 24,
CANDLE_ERR_SETUPDI_IF_ENUM = 25,
CANDLE_ERR_SET_TIMESTAMP_MODE = 26,
CANDLE_ERR_DEV_OUT_OF_RANGE = 27,
CANDLE_ERR_GET_TIMESTAMP = 28,
CANDLE_ERR_SET_PIPE_RAW_IO = 29
} candle_err_t;
#pragma pack(push,1)
typedef struct {
uint32_t echo_id;
uint32_t can_id;
uint8_t can_dlc;
uint8_t channel;
uint8_t flags;
uint8_t reserved;
uint8_t data[8];
uint32_t timestamp_us;
} candle_frame_t;
/* CAN FD frame: same header as candle_frame_t but with 64-byte data payload */
typedef struct {
uint32_t echo_id;
uint32_t can_id;
uint8_t can_dlc;
uint8_t channel;
uint8_t flags;
uint8_t reserved;
uint8_t data[64];
uint32_t timestamp_us;
} candle_fd_frame_t;
typedef struct {
uint32_t feature;
uint32_t fclk_can;
uint32_t tseg1_min;
uint32_t tseg1_max;
uint32_t tseg2_min;
uint32_t tseg2_max;
uint32_t sjw_max;
uint32_t brp_min;
uint32_t brp_max;
uint32_t brp_inc;
} candle_capability_t;
typedef struct {
uint32_t prop_seg;
uint32_t phase_seg1;
uint32_t phase_seg2;
uint32_t sjw;
uint32_t brp;
} candle_bittiming_t;
#pragma pack(pop)
/*
* CAN FD DLC encoding:
* DLC 0-8 → 0-8 bytes (same as classic CAN)
* DLC 9 → 12 bytes
* DLC 10 → 16 bytes
* DLC 11 → 20 bytes
* DLC 12 → 24 bytes
* DLC 13 → 32 bytes
* DLC 14 → 48 bytes
* DLC 15 → 64 bytes
*/
static inline uint8_t candle_dlc_to_len(uint8_t dlc)
{
static const uint8_t tbl[16] = { 0,1,2,3,4,5,6,7,8,12,16,20,24,32,48,64 };
return (dlc <= 15u) ? tbl[dlc] : 0u;
}
static inline uint8_t candle_len_to_dlc(uint8_t len)
{
if (len <= 8u) return len;
if (len <= 12u) return 9u;
if (len <= 16u) return 10u;
if (len <= 20u) return 11u;
if (len <= 24u) return 12u;
if (len <= 32u) return 13u;
if (len <= 48u) return 14u;
return 15u;
}
#define DLL
/* Optional log callback — set once at startup to receive diagnostic messages.
* If NULL (the default) no logging is performed. */
typedef void (*candle_log_fn_t)(const wchar_t *msg);
extern candle_log_fn_t candle_log_fn;
/* Set to true to enable per-frame and per-control-transfer trace logs.
* Off by default; only error and setup messages are logged. */
extern bool candle_log_verbose;
bool __stdcall DLL candle_list_scan(candle_list_handle *list);
bool __stdcall DLL candle_list_free(candle_list_handle list);
bool __stdcall DLL candle_list_length(candle_list_handle list, uint8_t *len);
bool __stdcall DLL candle_dev_get(candle_list_handle list, uint8_t dev_num, candle_handle *hdev);
bool __stdcall DLL candle_dev_get_state(candle_handle hdev, candle_devstate_t *state);
wchar_t __stdcall DLL *candle_dev_get_path(candle_handle hdev);
bool __stdcall DLL candle_dev_open(candle_handle hdev);
bool __stdcall DLL candle_dev_get_timestamp_us(candle_handle hdev, uint32_t *timestamp_us);
bool __stdcall DLL candle_dev_close(candle_handle hdev);
bool __stdcall DLL candle_dev_free(candle_handle hdev);
bool __stdcall DLL candle_channel_count(candle_handle hdev, uint8_t *num_channels);
bool __stdcall DLL candle_channel_get_capabilities(candle_handle hdev, uint8_t ch, candle_capability_t *cap);
bool __stdcall DLL candle_channel_get_state(candle_handle hdev, uint8_t ch, candle_can_state_t *state);
bool __stdcall DLL candle_channel_set_timing(candle_handle hdev, uint8_t ch, candle_bittiming_t *data);
bool __stdcall DLL candle_channel_set_bitrate(candle_handle hdev, uint8_t ch, uint32_t bitrate);
bool __stdcall DLL candle_channel_start(candle_handle hdev, uint8_t ch, uint32_t flags);
bool __stdcall DLL candle_channel_stop(candle_handle hdev, uint8_t ch);
bool __stdcall DLL candle_frame_send(candle_handle hdev, uint8_t ch, candle_frame_t *frame);
bool __stdcall DLL candle_frame_read(candle_handle hdev, candle_frame_t *frame, uint32_t timeout_ms);
candle_frametype_t __stdcall DLL candle_frame_type(candle_frame_t *frame);
uint32_t __stdcall DLL candle_frame_id(candle_frame_t *frame);
bool __stdcall DLL candle_frame_is_extended_id(candle_frame_t *frame);
bool __stdcall DLL candle_frame_is_rtr(candle_frame_t *frame);
uint8_t __stdcall DLL candle_frame_dlc(candle_frame_t *frame);
uint8_t __stdcall DLL *candle_frame_data(candle_frame_t *frame);
uint32_t __stdcall DLL candle_frame_timestamp_us(candle_frame_t *frame);
/* CAN FD extensions */
bool __stdcall DLL candle_channel_set_data_timing(candle_handle hdev, uint8_t ch, candle_bittiming_t *data);
bool __stdcall DLL candle_fd_frame_send(candle_handle hdev, uint8_t ch, candle_fd_frame_t *frame);
bool __stdcall DLL candle_fd_frame_read(candle_handle hdev, candle_fd_frame_t *frame, uint32_t timeout_ms);
candle_frametype_t __stdcall DLL candle_fd_frame_type(candle_fd_frame_t *frame);
uint32_t __stdcall DLL candle_fd_frame_id(candle_fd_frame_t *frame);
bool __stdcall DLL candle_fd_frame_is_extended_id(candle_fd_frame_t *frame);
bool __stdcall DLL candle_fd_frame_is_rtr(candle_fd_frame_t *frame);
bool __stdcall DLL candle_fd_frame_is_fd(candle_fd_frame_t *frame);
bool __stdcall DLL candle_fd_frame_is_brs(candle_fd_frame_t *frame);
uint8_t __stdcall DLL candle_fd_frame_dlc(candle_fd_frame_t *frame);
uint8_t __stdcall DLL *candle_fd_frame_data(candle_fd_frame_t *frame);
uint32_t __stdcall DLL candle_fd_frame_timestamp_us(candle_fd_frame_t *frame);
candle_err_t __stdcall DLL candle_dev_last_error(candle_handle hdev);
#ifdef __cplusplus
}
#endif
connections/candle_api/candle_ctrl_req.c
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/*
Copyright (c) 2016 Hubert Denkmair <hubert@denkmair.de>
This file is part of the candle windows API.
This library is free software: you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation, either
version 3 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "candle_ctrl_req.h"
#include "ch_9.h"
#include <stdarg.h>
enum {
CANDLE_BREQ_HOST_FORMAT = 0,
CANDLE_BREQ_BITTIMING = 1,
CANDLE_BREQ_MODE = 2,
CANDLE_BREQ_BERR = 3,
CANDLE_BREQ_BT_CONST = 4,
CANDLE_BREQ_DEVICE_CONFIG = 5,
CANDLE_TIMESTAMP_GET = 6,
/* 7: IDENTIFY, 8: GET_USER_ID, 9: SET_USER_ID (not used here) */
CANDLE_BREQ_DATA_BITTIMING = 10,
/* 11: SET_TERMINATION, not used here */
CANDLE_BREQ_GET_STATE = 12,
};
static void candle_ctrl_logf(const wchar_t *fmt, ...)
{
if (candle_log_fn == NULL || !candle_log_verbose) {
return;
}
wchar_t buf[512];
va_list args;
va_start(args, fmt);
HRESULT hr = StringCchVPrintfW(buf, 512, fmt, args);
va_end(args);
if (SUCCEEDED(hr)) {
candle_log_fn(buf);
}
}
static bool usb_control_msg(WINUSB_INTERFACE_HANDLE hnd, uint8_t request, uint8_t requesttype, uint16_t value, uint16_t index, void *data, uint16_t size)
{
WINUSB_SETUP_PACKET packet;
memset(&packet, 0, sizeof(packet));
packet.Request = request;
packet.RequestType = requesttype;
packet.Value = value;
packet.Index = index;
packet.Length = size;
unsigned long bytes_sent = 0;
BOOL rc = WinUsb_ControlTransfer(hnd, packet, (uint8_t*)data, size, &bytes_sent, 0);
candle_ctrl_logf(L"ctrl req=0x%02x type=0x%02x value=%u index=%u size=%u rc=%u transferred=%lu winerr=%lu",
request,
requesttype,
value,
index,
size,
rc ? 1 : 0,
bytes_sent,
rc ? 0 : GetLastError());
return rc;
}
bool candle_ctrl_set_host_format(candle_device_t *dev)
{
candle_host_config_t hconf;
hconf.byte_order = 0x0000beef;
bool rc = usb_control_msg(
dev->winUSBHandle,
CANDLE_BREQ_HOST_FORMAT,
USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
1,
dev->interfaceNumber,
&hconf,
sizeof(hconf)
);
dev->last_error = rc ? CANDLE_ERR_OK : CANDLE_ERR_SET_HOST_FORMAT;
return rc;
}
bool candle_ctrl_set_device_mode(candle_device_t *dev, uint8_t channel, uint32_t mode, uint32_t flags)
{
candle_device_mode_t dm;
dm.mode = mode;
dm.flags = flags;
bool rc = usb_control_msg(
dev->winUSBHandle,
CANDLE_BREQ_MODE,
USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
channel,
dev->interfaceNumber,
&dm,
sizeof(dm)
);
dev->last_error = rc ? CANDLE_ERR_OK : CANDLE_ERR_SET_DEVICE_MODE;
return rc;
}
bool candle_ctrl_get_config(candle_device_t *dev, candle_device_config_t *dconf)
{
bool rc = usb_control_msg(
dev->winUSBHandle,
CANDLE_BREQ_DEVICE_CONFIG,
USB_DIR_IN|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
1,
dev->interfaceNumber,
dconf,
sizeof(*dconf)
);
dev->last_error = rc ? CANDLE_ERR_OK : CANDLE_ERR_GET_DEVICE_INFO;
return rc;
}
bool candle_ctrl_get_timestamp(candle_device_t *dev, uint32_t *current_timestamp)
{
bool rc = usb_control_msg(
dev->winUSBHandle,
CANDLE_TIMESTAMP_GET,
USB_DIR_IN|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
1,
dev->interfaceNumber,
current_timestamp,
sizeof(*current_timestamp)
);
dev->last_error = rc ? CANDLE_ERR_OK : CANDLE_ERR_GET_TIMESTAMP;
return rc;
}
bool candle_ctrl_get_capability(candle_device_t *dev, uint8_t channel, candle_capability_t *data)
{
bool rc = usb_control_msg(
dev->winUSBHandle,
CANDLE_BREQ_BT_CONST,
USB_DIR_IN|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
channel,
0,
data,
sizeof(*data)
);
dev->last_error = rc ? CANDLE_ERR_OK : CANDLE_ERR_GET_BITTIMING_CONST;
return rc;
}
bool candle_ctrl_set_bittiming(candle_device_t *dev, uint8_t channel, candle_bittiming_t *data)
{
bool rc = usb_control_msg(
dev->winUSBHandle,
CANDLE_BREQ_BITTIMING,
USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
channel,
0,
data,
sizeof(*data)
);
dev->last_error = rc ? CANDLE_ERR_OK : CANDLE_ERR_SET_BITTIMING;
return rc;
}
bool candle_ctrl_set_data_bittiming(candle_device_t *dev, uint8_t channel, candle_bittiming_t *data)
{
bool rc = usb_control_msg(
dev->winUSBHandle,
CANDLE_BREQ_DATA_BITTIMING,
USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
channel,
0,
data,
sizeof(*data)
);
dev->last_error = rc ? CANDLE_ERR_OK : CANDLE_ERR_SET_BITTIMING;
return rc;
}
bool candle_ctrl_get_state(candle_device_t *dev, uint8_t channel, candle_device_state_t *data)
{
bool rc = usb_control_msg(
dev->winUSBHandle,
CANDLE_BREQ_GET_STATE,
USB_DIR_IN|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
channel,
dev->interfaceNumber,
data,
sizeof(*data)
);
dev->last_error = rc ? CANDLE_ERR_OK : CANDLE_ERR_GET_DEVICE_INFO;
return rc;
}
connections/candle_api/candle_ctrl_req.h
+48
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@@ -0,0 +1,48 @@
/*
Copyright (c) 2016 Hubert Denkmair <hubert@denkmair.de>
Copyright (c) 2026 Schildkroet
This file is part of the candle windows API.
This library is free software: you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation, either
version 3 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "candle_defs.h"
enum {
CANDLE_DEVMODE_RESET = 0,
CANDLE_DEVMODE_START = 1
};
#pragma pack(push, 1)
typedef struct {
uint32_t state;
uint32_t rxerr;
uint32_t txerr;
} candle_device_state_t;
#pragma pack(pop)
bool candle_ctrl_set_host_format(candle_device_t *dev);
bool candle_ctrl_set_device_mode(candle_device_t *dev, uint8_t channel, uint32_t mode, uint32_t flags);
bool candle_ctrl_get_config(candle_device_t *dev, candle_device_config_t *dconf);
bool candle_ctrl_get_capability(candle_device_t *dev, uint8_t channel, candle_capability_t *data);
bool candle_ctrl_set_bittiming(candle_device_t *dev, uint8_t channel, candle_bittiming_t *data);
bool candle_ctrl_set_data_bittiming(candle_device_t *dev, uint8_t channel, candle_bittiming_t *data);
bool candle_ctrl_get_timestamp(candle_device_t *dev, uint32_t *current_timestamp);
bool candle_ctrl_get_state(candle_device_t *dev, uint8_t channel, candle_device_state_t *data);
connections/candle_api/candle_defs.h
+101
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@@ -0,0 +1,101 @@
/*
Copyright (c) 2016 Hubert Denkmair <hubert@denkmair.de>
Copyright (c) 2026 Schildkroet
This file is part of the candle windows API.
This library is free software: you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation, either
version 3 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <stdint.h>
#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x0600
#endif
#include <windows.h>
#include <winbase.h>
#include <winusb.h>
#include <setupapi.h>
#include <devguid.h>
#include <regstr.h>
#undef __CRT__NO_INLINE
#include <strsafe.h>
#define __CRT__NO_INLINE
#include "candle.h"
#define CANDLE_MAX_DEVICES 32
#define CANDLE_URB_COUNT 30
#pragma pack(push,1)
typedef struct {
uint32_t byte_order;
} candle_host_config_t;
typedef struct {
uint8_t reserved1;
uint8_t reserved2;
uint8_t reserved3;
uint8_t icount;
uint32_t sw_version;
uint32_t hw_version;
} candle_device_config_t;
typedef struct {
uint32_t mode;
uint32_t flags;
} candle_device_mode_t;
#pragma pack(pop)
typedef struct {
OVERLAPPED ovl;
bool pending;
uint8_t buf[512];
} canlde_rx_urb;
typedef struct {
wchar_t path[256];
candle_devstate_t state;
candle_err_t last_error;
HANDLE deviceHandle;
WINUSB_INTERFACE_HANDLE winUSBHandle;
UCHAR interfaceNumber;
UCHAR bulkInPipe;
UCHAR bulkOutPipe;
HANDLE txEvent; /* pre-allocated event for timed overlapped writes */
candle_device_config_t dconf;
candle_capability_t bt_const;
/* Per-channel capabilities: index 0..dconf.icount, maximum 8 channels */
candle_capability_t ch_caps[8];
canlde_rx_urb rxurbs[CANDLE_URB_COUNT];
HANDLE rxevents[CANDLE_URB_COUNT];
} candle_device_t;
typedef struct {
uint8_t num_devices;
candle_err_t last_error;
candle_device_t dev[CANDLE_MAX_DEVICES];
} candle_list_t;
connections/candle_api/ch_9.h
+37
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@@ -0,0 +1,37 @@
/*
Copyright (c) 2016 Hubert Denkmair <hubert@denkmair.de>
This file is part of the candle windows API.
This library is free software: you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation, either
version 3 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#define USB_DIR_OUT 0 /* to device */
#define USB_DIR_IN 0x80 /* to host */
#define USB_TYPE_MASK (0x03 << 5)
#define USB_TYPE_STANDARD (0x00 << 5)
#define USB_TYPE_CLASS (0x01 << 5)
#define USB_TYPE_VENDOR (0x02 << 5)
#define USB_TYPE_RESERVED (0x03 << 5)
#define USB_RECIP_MASK 0x1f
#define USB_RECIP_DEVICE 0x00
#define USB_RECIP_INTERFACE 0x01
#define USB_RECIP_ENDPOINT 0x02
#define USB_RECIP_OTHER 0x03