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) 2022-2024 WPC Systems Ltd. All rights reserved.
 18'''
 19
 20## Python
 21import asyncio
 22
 23## WPC
 24
 25from wpcsys import pywpc
 26
 27async def main():
 28    ## Get python driver version
 29    print(f'{pywpc.PKG_FULL_NAME} - Version {pywpc.__version__}')
 30
 31    ## Create device handle
 32    dev = pywpc.USBDAQF1CD()
 33
 34    ## Connect to device
 35    try:
 36        dev.connect("default") ## Depend on your device
 37    except Exception as err:
 38        pywpc.printGenericError(err)
 39        ## Release device handle
 40        dev.close()
 41        return
 42
 43    try:
 44        ## Parameters setting
 45        port = 1 ## Depend on your device
 46        speed = 0 ## 0 = 125 KHz, 1 = 250 kHz, 2 = 500 kHz, 3 = 1 MHz
 47
 48        ## Get Firmware model & version
 49        driver_info = await dev.Sys_getDriverInfo_async()
 50        print("Model name: " + driver_info[0])
 51        print("Firmware version: " + driver_info[-1])
 52
 53        ## Open CAN
 54        err = await dev.CAN_open_async(port)
 55        print(f"CAN_open_async in port {port}, status: {err}")
 56
 57        ## Set CAN port and set speed to 0
 58        err = await dev.CAN_setSpeed_async(port, speed)
 59        print(f"CAN_setSpeed_async in port {port}, status: {err}")
 60
 61        ## Set CAN port and start CAN
 62        err = await dev.CAN_start_async(port)
 63        print(f"CAN_start_async in port {port}, status: {err}")
 64
 65        ## CAN_length: True: Extended, False: Standard
 66        ## CAN_type:   True: Remote, False: Data
 67
 68        ## ID: 10, data with 8 bytes, Standard & Data
 69        err = await dev.CAN_write_async(port, 10, [33, 22, 11, 88, 77, 55, 66, 22], False, False)
 70        print(f"CAN_write_async in port {port}, status: {err}")
 71
 72        ## Wait for 1 sec
 73        await asyncio.sleep(1) ## delay [s]
 74
 75        ## ID: 20, data less than 8 bytes, Standard & Data
 76        err = await dev.CAN_write_async(port, 20, [1, 2, 3], False, False)
 77        print(f"CAN_write_async in port {port}, status: {err}")
 78
 79        ## Wait for 1 sec
 80        await asyncio.sleep(1) ## delay [s]
 81
 82        ## Set CAN port and stop CAN
 83        err = await dev.CAN_stop_async(port)
 84        print(f"CAN_stop_async in port {port}, status: {err}")
 85
 86        ## Close CAN
 87        err = await dev.CAN_close_async(port)
 88        print(f"CAN_close_async in port {port}, status: {err}")
 89    except Exception as err:
 90        pywpc.printGenericError(err)
 91
 92    ## Disconnect device
 93    dev.disconnect()
 94
 95    ## Release device handle
 96    dev.close()
 97
 98    return
 99
100def main_for_spyder(*args):
101    if asyncio.get_event_loop().is_running():
102        return asyncio.create_task(main(*args)).result()
103    else:
104        return asyncio.run(main(*args))
105
106if __name__ == '__main__':
107    asyncio.run(main()) ## Use terminal
108    # await main() ## Use Jupyter or IPython(>=7.0)
109    # main_for_spyder() ## Use Spyder