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) 2022-2024 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        port  = 1
 47        speed = 0 ## 0 = 125 KHz, 1 = 250 kHz, 2 = 500 kHz, 3 = 1 MHz
 48        read_delay = 0.005 ## second
 49
 50        ## Get Firmware model & version
 51        driver_info = await dev.Sys_getDriverInfo_async()
 52        print("Model name: " + driver_info[0])
 53        print("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 [s]
 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    ## Disconnect device
 88    dev.disconnect()
 89
 90    ## Release device handle
 91    dev.close()
 92
 93    return
 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
101if __name__ == '__main__':
102    asyncio.run(main()) ## Use terminal
103    # await main() ## Use Jupyter or IPython(>=7.0)
104    # main_for_spyder() ## Use Spyder