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Atomic CAN Base
Example
When button A is pressed, a CAN data frame [0, 1, 2, 3, 4, 5, 6, 7] (ID is 0) is sent, and the CAN bus status is continuously detected in the main loop
from m5stack import *
from m5ui import *
from uiflow import *
from base.CAN import CAN
import time
frame = None
atom_can = CAN()
def buttonA_wasPressed():
global frame
atom_can.send([0, 1, 2, 3, 4, 5, 6, 7], 0)
pass
btnA.wasPressed(buttonA_wasPressed)
atom_can.can_init(0, extframe=True, mode=atom_can.NORMAL, baudrate=atom_can.BAUDRATE_250K, tx_io=22, rx_io=19, auto_restart=False)
while True:
print((str('status:') + str(atom_can.state())))
if atom_can.any():
frame = atom_can.recv()
print((str('data:') + str(frame)))
wait_ms(30)
wait_ms(2)Base
API
from base.CAN import CAN
atom_can = CAN()
atom_can.can_init(0, extframe=True, mode=atom_can.NORMAL, baudrate=atom_can.BAUDRATE_250K, tx_io=22, rx_io=19, auto_restart=False)- Initialize the CAN bus, configure whether it is in extended frame mode, set the operating mode (normal mode, loopback mode, etc.), and set the baud rate.
atom_can.any()- Check if there is unread data in the FIFO.
frame = atom_can.recv()- Receive data.
atom_can.send([0, 1, 2, 3, 4, 5, 6, 7], id)- Send a data frame with the specified ID. The ID length is
1 byte, and the data must be of typelistortuple, with a data frame length of8 bytes.
atom_can.setfilter(0, CAN.FILTER_RAW_SINGLE, [])- Set a filter group.
atom_can.state()- Get the CAN controller status.
atom_can.clear_rx_queue()- Clear the receive queue.
atom_can.clear_tx_queue()- Clear the transmit queue.
atom_can.clearfilter()- Clear the filter group.
atom_can.restart()- Restart the CAN bus.
atom_can.deinit()- Stop the CAN bus.