Explication de routine-02-can CANcommunication
# CAN 扩展板示例
#
# 此示例演示了两个摄像机之间的CAN通信。
# 注意:您需要两个CAN收发器扩展板和DB9电缆才能运行此示例。
import time, omv
from pyb import CAN
# 注意:在接收节点上设置为False。
TRANSMITTER = True
can = CAN(2, CAN.NORMAL)
# 设置不同的波特率(默认为125Kbps)
# 注意:以下参数仅适用于H7。
#
# can.init(CAN.NORMAL, prescaler=32, sjw=1, bs1=8, bs2=3) # 125Kbps
# can.init(CAN.NORMAL, prescaler=16, sjw=1, bs1=8, bs2=3) # 250Kbps
# can.init(CAN.NORMAL, prescaler=8, sjw=1, bs1=8, bs2=3) # 500Kbps
# can.init(CAN.NORMAL, prescaler=4, sjw=1, bs1=8, bs2=3) # 1000Kbps
can.restart()
if (TRANSMITTER):
while (True):
# Send message with id 1
can.send('Hello', 1)
time.sleep_ms(1000)
else:
# 在接收节点上运行。
if (omv.board_type() == 'H7'): # FDCAN
# Set a filter to receive messages with id=1 -> 4
# Filter index, mode (RANGE, DUAL or MASK), FIFO (0 or 1), params
can.setfilter(0, CAN.RANGE, 0, (1, 4))
else:
# Set a filter to receive messages with id=1, 2, 3 and 4
# Filter index, mode (LIST16, etc..), FIFO (0 or 1), params
can.setfilter(0, CAN.LIST16, 0, (1, 2, 3, 4))
while (True):
# Receive messages on FIFO 0
print(can.recv(0, timeout=10000))
Le module pyb ne peut pas être utilisé sur OpenMV RT. Seuls les modules machine suivants peuvent être utilisés :
# CAN 扩展板示例
#
# 此示例演示了两个摄像机之间的CAN通信。
# 注意:您需要两个CAN收发器扩展板和DB9电缆才能运行此示例。
import time
from machine import CAN
# 注意:在接收节点上设置为False。
TRANSMITTER = True
can = CAN(0, CAN.NORMAL, baudrate=1000000, auto_restart=True)
if TRANSMITTER:
while True:
# Send message with id 1
can.send("Hello", 1, timeout=100, extframe=False)
time.sleep_ms(1000)
else:
# Runs on the receiving node.
# Set a filter to receive messages with id=1 and 2
# Filter index, mode (DUAL, etc..), FIFO (0), params
can.setfilter(0, CAN.DUAL, 0, [1, 2])
while True:
# Receive messages on FIFO 0 (there's only one fifo)
print(can.recv(0, timeout=10000))