How to fix the CAN bus send error
Posted: Wed May 18, 2022 12:03 pm
I had STM32F407VGT6 board, had porting the pyb can function base on Micropython-v1.18-443. The Can Bus LOOPBACK is ok, but when send the message used
the API:Can.send("message!", 123), send four times later every 1 seconds, had show: OSError 16. How slove this issue.
the API:Can.send("message!", 123), send four times later every 1 seconds, had show: OSError 16. How slove this issue.
Code: Select all
from pyb import CAN
from machine import Pin
import uasyncio as asyncio
from pyb import CAN
can1 = CAN(2, CAN.NORMAL,prescaler=2, sjw=1, bs1=14, bs2=6 )
buf = bytearray(1)
buf[0] = 0
msg_id = 123
def printmsg(msg):
buf[0] += 1
print('msg: {} count: {}'.format(msg,buf[0]))
can1.send((msg), msg_id)
def cb0(bus, reason):
print('cb0')
if reason == 0:
print('pending')
buf1[0] += 1
print('msg: {} count: {}'.format(bytes(lst[3]), buf1[0]))
if reason == 1:
print('full')
if reason == 2:
print('overflow')
can2.rxcallback(0, cb0)
async def main():
#pin = Pin(Pin.cpu.C4, Pin.IN, Pin.PULL_UP)
#pb = Pushbutton(pin)
#pb.press_func(printmsg, ('push', ))
#pb.long_func(printmsg, ('long',))
while True:
await asyncio.sleep(1) #keep the uasyncio loop alive
printmsg('message')
try:
asyncio.run(main())
except (KeyboardInterrupt, Exception) as e:
print('Exception {} {}\n'.format(type(e).__name__, e))
#finally:
# ret = asyncio.new_event_loop() # Clear retained uasyncio state