Performing operations on non-initialized Timer leads to crashes/lockups
After pressing RESET button and typing:
Micro Python v1.3.10 on 2015-02-13; PYBv1.0 with STM32F405RG
Type "help()" for more information.
>>> n = 3
>>> def countdown(timer):
... global n
... if n <= 0:
... print("Launch!")
... timer.deinit()
... else:
... print(n)
... n -= 1
...
>>> tim = pyb.Timer(4, freq=1, callback=countdown)
At this moment REPL hangs and I need to press RESET to recover. :cry:
Probably related issue:
Micro Python v1.3.10 on 2015-02-13; PYBv1.0 with STM32F405RG
Type "help()" for more information.
>>> n = 3
>>> def countdown(timer):
... global n
... if n <= 0:
... print("Launch!")
... timer.deinit()
... else:
... print(n)
... n -= 1
...
>>> tim = pyb.Timer(4)
>>> tim.callback(countdown)
>>> tim.init(freq=1)
>>> # Nothing happens :|
Nevertheless it does work if I continue and provide both kwargs:
>>> tim.init(freq=1, callback=countdown)
3
>>> 2
1
Launch!
However, if I continue with:
>>> tim.deinit()
>>> tim.callback(countdown)
>>> Launch!
I did not expect after issuing deinit() to have triggered callbacks without explicitly calling init with freq kwarg. :confused:
And after issuing a soft reset
PYB: sync filesystems
PYB: soft reboot
Micro Python v1.3.10 on 2015-02-13; PYBv1.0 with STM32F405RG
Type "help()" for more information.
>>> tim = pyb.Timer(4, callback=print("I did not set freq option"))
I did not set freq option
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: must specify either freq, or prescaler and period
>>> tim = pyb.Timer(4)
>>> tim.callback(print("I did not set freq option"))
I did not set freq option
>>>
It certainly comes as a surprise that callback is still kicking without explicit freq
Timer: deinit(): lag
Hello I was wonders if there is lag when de-initialising the timer at faster PERIODs < 5ms; in my application I require the faster period, please let me know if this is expected? If said behaviour expected I suppose I can use the counter_en return value to stop my code as needed? Thanks Team.
`from machine import Timer, freq
print(freq()) # get the current frequency of the CPU
freq(240000000) # set the CPU frequency to 240 MHz
print(freq())
count = 0
timeX = Timer(1)
def timer_callback(t):
print(t)
global count
print(count)
count += 1
if (count == 50):
timeX.deinit()
timeX.init(mode=Timer.PERIODIC, period=5, callback=timer_callback)`
Lag: Count should stop at 49 but goes to 53 when period=5
Good: Works great stops at 49 for period=10
