1'''
2CAN - CAN_read.py with asynchronous mode.
3
4This example demonstrates how to read data from another device with CAN interface from USBDAQF1CD.
5
6First, it shows how to open CAN port and configure CAN parameters.
7Second, read bytes from another device.
8Last, stop and close CAN port.
9
10-------------------------------------------------------------------------------------
11Please change correct serial number or IP and port number BEFORE you run example code.
12
13For other examples please check:
14 https://github.com/WPC-Systems-Ltd/WPC_Python_driver_release/tree/main/examples
15See README.md file to get detailed usage of this example.
16
17Copyright (c) 2022-2025 WPC Systems Ltd. All rights reserved.
18'''
19
20## WPC
21from wpcsys import pywpc
22
23## Python
24import asyncio
25import sys
26sys.path.insert(0, 'src/')
27
28
29async def main():
30 ## Get python driver version
31 print(f'{pywpc.PKG_FULL_NAME} - Version {pywpc.__version__}')
32
33 ## Create device handle
34 dev = pywpc.USBDAQF1CD()
35
36 ## Connect to device
37 try:
38 dev.connect("default") ## Depend on your device
39 except Exception as err:
40 pywpc.printGenericError(err)
41 ## Release device handle
42 dev.close()
43 return
44
45 try:
46 ## Parameters setting
47 port = 1 ## Depend on your device
48 speed = 0 ## 0: 125 KHz, 1: 250 kHz, 2: 500 kHz, 3: 1 MHz
49 read_delay = 0.005 ## [sec]
50
51 ## Get firmware model & version
52 driver_info = await dev.Sys_getDriverInfo_async()
53 print(f"Model name: {driver_info[0]}, Firmware version: {driver_info[-1]} ")
54
55 ## Open CAN
56 err = await dev.CAN_open_async(port)
57 print(f"CAN_open_async in port {port}, status: {err}")
58
59 ## Set CAN port and set speed to 0
60 err = await dev.CAN_setSpeed_async(port, speed)
61 print(f"CAN_setSpeed_async in port {port}, status: {err}")
62
63 ## Set CAN port and start CAN
64 err = await dev.CAN_start_async(port)
65 print(f"CAN_start_async in port {port}, status: {err}")
66
67 ## Read 5 frames for 1000 times
68 for i in range(1000):
69 frame_list = await dev.CAN_read_async(port, 5, read_delay)
70 if len(frame_list) > 0:
71 for frame in frame_list:
72 print(frame)
73 else:
74 ## Wait
75 await asyncio.sleep(0.01) ## delay [sec]
76
77 ## Set CAN port and stop CAN
78 err = await dev.CAN_stop_async(port)
79 print(f"CAN_stop_async in port {port}, status: {err}")
80
81 ## Close CAN
82 err = await dev.CAN_close_async(port)
83 print(f"CAN_close_async in port {port}, status: {err}")
84 except Exception as err:
85 pywpc.printGenericError(err)
86
87 finally:
88 ## Disconnect device
89 dev.disconnect()
90
91 ## Release device handle
92 dev.close()
93
94
95def main_for_spyder(*args):
96 if asyncio.get_event_loop().is_running():
97 return asyncio.create_task(main(*args)).result()
98 else:
99 return asyncio.run(main(*args))
100
101
102if __name__ == '__main__':
103 asyncio.run(main()) ## Use terminal
104 # await main() ## Use Jupyter or IPython(>=7.0)
105 # main_for_spyder() ## Use Spyder