CAN write

  1'''
  2CAN - CAN_write.py with asynchronous mode.
  3
  4This example demonstrates how to write data to another device with CAN interface from USBDAQF1CD.
  5
  6First, it shows how to open CAN port and configure CAN parameters.
  7Second, write bytes to 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
 50        ## Get firmware model & version
 51        driver_info = await dev.Sys_getDriverInfo_async()
 52        print(f"Model name: {driver_info[0]}, Firmware version: {driver_info[-1]} ")
 53
 54        ## Open CAN
 55        err = await dev.CAN_open_async(port)
 56        print(f"CAN_open_async in port {port}, status: {err}")
 57
 58        ## Set CAN port and set speed to 0
 59        err = await dev.CAN_setSpeed_async(port, speed)
 60        print(f"CAN_setSpeed_async in port {port}, status: {err}")
 61
 62        ## Set CAN port and start CAN
 63        err = await dev.CAN_start_async(port)
 64        print(f"CAN_start_async in port {port}, status: {err}")
 65
 66        ## CAN_length: True: Extended, False: Standard
 67        ## CAN_type:   True: Remote, False: Data
 68
 69        ## ID: 10, data with 8 bytes, Standard & Data
 70        err = await dev.CAN_write_async(port, 10, [33, 22, 11, 88, 77, 55, 66, 22], False, False)
 71        print(f"CAN_write_async in port {port}, status: {err}")
 72
 73        ## Wait for 1 sec
 74        await asyncio.sleep(1)  ## delay [sec]
 75
 76        ## ID: 20, data less than 8 bytes, Standard & Data
 77        err = await dev.CAN_write_async(port, 20, [1, 2, 3], False, False)
 78        print(f"CAN_write_async in port {port}, status: {err}")
 79
 80        ## Wait for 1 sec
 81        await asyncio.sleep(1)  ## delay [sec]
 82
 83        ## Set CAN port and stop CAN
 84        err = await dev.CAN_stop_async(port)
 85        print(f"CAN_stop_async in port {port}, status: {err}")
 86
 87        ## Close CAN
 88        err = await dev.CAN_close_async(port)
 89        print(f"CAN_close_async in port {port}, status: {err}")
 90    except Exception as err:
 91        pywpc.printGenericError(err)
 92
 93    finally:
 94        ## Disconnect device
 95        dev.disconnect()
 96
 97        ## Release device handle
 98        dev.close()
 99
100
101def main_for_spyder(*args):
102    if asyncio.get_event_loop().is_running():
103        return asyncio.create_task(main(*args)).result()
104    else:
105        return asyncio.run(main(*args))
106
107
108if __name__ == '__main__':
109    asyncio.run(main())  ## Use terminal
110    # await main()  ## Use Jupyter or IPython(>=7.0)
111    # main_for_spyder()  ## Use Spyder