CAN read

  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