周立功USBCANFD_200U的Python调用
参考前篇 周立功USBCAN-II的Python调用
当普通CAN用, 500K, 程序参考如下(未验证, 如需CANFD Fast传输, 把发送函数的BRS参数提出来, 采样点设置暂无)
from zlgcan import *
import time
import platform
zcanlib = ZCAN()
def open_usbcan2():
device_handle = zcanlib.OpenDevice(ZCAN_USBCANFD_200U, 0,0)
if device_handle == INVALID_DEVICE_HANDLE:
print("Open Device failed!")
exit(0)
print("device handle:%d." %(device_handle))
# info = zcanlib.GetDeviceInf(device_handle)
# print("Device Information:\n%s" %(info))
return device_handle
def open_channel(device_handle, channel):
chn_init_cfg = ZCAN_CHANNEL_INIT_CONFIG()
chn_init_cfg.can_type = ZCAN_TYPE_CANFD
chn_init_cfg.config.canfd.mode = 0
# From dev_info.json
chn_init_cfg.config.canfd.abit_timing = 104286 # 500K
chn_init_cfg.config.canfd.dbit_timing = 4260362 # 2M
chn_handle = zcanlib.InitCAN(device_handle, channel, chn_init_cfg)
if chn_handle is None:
return None
zcanlib.StartCAN(chn_handle)
return chn_handle
def transmit_can(chn_handle, stdorext, id, data, len):
transmit_num = 1
msgs = (ZCAN_TransmitFD_Data * transmit_num)()
for i in range(transmit_num):
msgs[i].transmit_type = 0 #Send Self
msgs[i].frame.eff = 0
if stdorext:
msgs[i].frame.eff = 1 #extern frame
msgs[i].frame.rtr = 0 #remote frame
msgs[i].frame.can_id = id
msgs[i].frame.brs = 0 # 1: fast, for examplt: 2M
msgs[i].frame.len = len
for j in range(len):
msgs[i].frame.data[j] = data[j]
ret = zcanlib.TransmitFD(chn_handle, msgs, transmit_num)
def receive_can(chn_handle):
rcv_num = zcanlib.GetReceiveNum(chn_handle, ZCAN_TYPE_CANFD)
if rcv_num:
print("Receive CAN message number:%d" % rcv_num)
rcv_msg, rcv_num = zcanlib.ReceiveFD(chn_handle, rcv_num)
for i in range(rcv_num):
print("[%d]:ts:%d, id:0x%x, dlc:%d, eff:%d, rtr:%d, data:%s" %(i, rcv_msg[i].timestamp,
rcv_msg[i].frame.can_id, rcv_msg[i].frame.can_dlc,
rcv_msg[i].frame.eff, rcv_msg[i].frame.rtr,
''.join(hex(rcv_msg[i].frame.data[j])[2:] + ' ' for j in range(rcv_msg[i].frame.can_dlc))))
if __name__ == "__main__":
# dll support
if platform.python_version()>='3.8.0':
import os
os.add_dll_directory(os.getcwd())
# open device and channel 0
dev_handle = open_usbcan2()
chn_handle = open_channel(dev_handle, 0)
chn1_handle = open_channel(dev_handle, 1)
print("channel 0 handle:%d." %(chn_handle))
print("channel 1 handle:%d." %(chn_handle))
# send can message
data = [0,1,2,3,4,5,6,0xFF]
for i in range(2):
transmit_can(chn_handle, 0, 0x100, data, 6)
transmit_can(chn1_handle, 0, 0x101, data, 7)
transmit_can(chn_handle, 1, 0x12345678, data, 8)
transmit_can(chn1_handle, 1, 0x12345679, data, 8)
data[0] = data[0] + 1
time.sleep(0.1)
# receive can message
zcanlib.ClearBuffer(chn_handle)
time.sleep(3)
receive_can(chn_handle)
receive_can(chn1_handle)
#Close Channel
zcanlib.ResetCAN(chn_handle)
zcanlib.ResetCAN(chn1_handle)
#Close Device
zcanlib.CloseDevice(dev_handle)
print("Finished")
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