MicroPython Forum (Archive)

dhylands wrote:You can get more detailed information on the exception by doing:

Code: Select all

import micropython
micropython.alloc_emergency_exception_buf(100)

what is 'heap is locked'?

def rfid_tick(timer):
if rfid_port.any():
beep_on()
start_ns_delay()
def start_rfid_tick():
tim = pyb.Timer(4,freq=5)
tim.callback(rfid_tick)

uncaught exception in Timer(4) interrupt handler
MemoryError:

The reason is that you are allocating memory in the callback. tmp = bus.recv(self.fifo) The callback is executing in interrupt mode, and in that mode memory it is not allowed to allocate memory. There has been some discussions about how to solve this. One way is to add soft interrupts like in this ...

who can tell me why? Me. It is because your second regex tries to match '~0' at the beginning ('^') of the string, but the value of a doesn't match. If you want to match at the beginning of a line , you need the re.MULTILINE flag. Not sure if the micropython re module supports that. https://docs.py...

re.match() is anchored to the start of the string. You have to use re.search(), if the pattern is in the middle of the string. And in re.search(), '^' and '$' mean the begin and end of the string, not special characters like \r or \n. the function match and search will get the same rezult. it can n...

If I run the tmp=re.match('^abc(.*?)cde$','abc123213cde') tmp.group(1) it can print '123213'. but if I run the a=b'\r\nSEND OK\r\nAT+CIPSEND=125\r\n~011200g\x8a\xb0\xd3F\x0b\xc9\x88\x1e\x9d\xaf\x14\x9f\xfb\x9fR\xcb\xc5\xb4"\xf8>\xff\x0ftc t,\x18\xfa\xad\xf7!0V\xb6\xa6Y\xefH8\x0e\x17\xd4\xc8s\x0f\x04...

when I use the can.recv(0) in the rxcallback function, it will point that ' uncaught exception in CAN(2) rx interrupt handler MemoryError:' . why? def rec0(self,bus, reason): print('rec0') if reason == 0: print('pending') #print(bus) #print(self.can) #help(bus) tmp = bus.recv(self.fifo) print(tmp[3]...

when I run the order 'can.send('12345678',0x7ff)' in the commend window, the system return the error : OSError 16. what is it?

dhylands wrote:http://forum.micropython.org/viewtopic. ... 9873#p9873

thank you very much!

dhylands wrote:You can also use select on the uarts.

thanks , and do you give me an example?