standby = digitalio.DigitalInOut(board.CAN_STANDBY)
standby.switch_to_output(False)
# If the CAN transceiver is powered by a boost converter, turn on its supply
if hasattr(board, 'BOOST_ENABLE'):
boost_enable = digitalio.DigitalInOut(board.BOOST_ENABLE)
boost_enable.switch_to_output(True)
# Use this line if your board has dedicated CAN pins. (Feather M4 CAN and Feather STM32F405)
can = canio.CAN(rx=board.CAN_RX,
tx=board.CAN_TX,
baudrate=250_000,
auto_restart=True)
# On ESP32S2 most pins can be used for CAN. Uncomment the following line to use IO5 and IO6
#can = canio.CAN(rx=board.IO6, tx=board.IO5, baudrate=250_000, auto_restart=True)
listener = can.listen(matches=[canio.Match(0x408)], timeout=.9)
old_bus_state = None
old_count = -1
while True:
bus_state = can.state
if bus_state != old_bus_state:
print(f"Bus state changed to {bus_state}")
old_bus_state = bus_state
message = listener.receive()
if message is None:
print("No messsage received within timeout")
continue
standby = digitalio.DigitalInOut(board.CAN_STANDBY)
standby.switch_to_output(False)
# The CAN transceiver is powered by a boost converter, turn on its supply
if hasattr(board, 'BOOST_ENABLE'):
boost_enable = digitalio.DigitalInOut(board.BOOST_ENABLE)
boost_enable.switch_to_output(True)
# Use this line if your board has dedicated CAN pins. (Feather M4 CAN and Feather STM32F405)
can = canio.CAN(rx=board.CAN_RX,
tx=board.CAN_TX,
baudrate=500_000,
auto_restart=True)
# CAN listener 0x602 and 0x603
listener = can.listen(matches=[canio.Match(0x602, mask=0x604)], timeout=.1)
# Needed for CAN BUS
old_bus_state = None
last_message_id = 0
# Main loop
while True:
# Touch control
while st.touched:
while not st.buffer_empty:
ts = st.touches
for point in ts:
# Perform transformation to get into
# display coordinate system! (Not in use)
# y = point["y"]
