pcduino/python-pcduino

python-pcduino's Issues

What happened with pwm?

Hello, I'm really curios to know, why the PWM was removed.
Thanks

Using CFFI with c_environment

The python lib provided for pcduino with gpio lacks quite a bit. In particular I am interested in in pulseIn function, which is not available. I tried to write my own, but I get strange behavior (this is for HC-SR04 distance sensor).
I see that another issue was closed asking people to use CFFI. It is not clear to me how to use it, so I tried the following and failed with ugly compile errors:

from cffi import FFI
ffi = FFI()
lib = ffi.verify("#include <~/c_enviroment/sample/core.h>")

as you can see I did not get far ( I am sure I am doing something totally wrong). I get this error:

File "/usr/local/lib/python2.7/dist-packages/cffi/ffiplatform.py", line 51, in _build
raise VerificationError('%s: %s' % (e.class.name, e))
cffi.ffiplatform.VerificationError: CompileError: command 'gcc' failed with exit status 1

I have also tried:

ffi.verify("#include \"/home/ubuntu/c_enviroment/sample/core.h\"")

This time it will find core.h, but complain that it can not find all the other .h files like Arduino.h that core.h refers too.

I would appreciate your help. Thank you

eeror

The following error occurred while I was editing my project: No such file or directory :/sys/class/misc/pwmtimer/enable

pwm pins exhibit bimodal behavior

Edit: see below for how to reproduce

Sometimes a PWM pin will get in to a mode where values
0: off
1:
2: <same as 1>

i.e. setting a value >= 1 will cause it to emit at a certain frequency (I've seen low values and high values), but no value > 1 will change it.

The actual value written can still be read.

Rebooting the device fixes the issue.

rewrite to use cffi

Let's use cffi to talk to the c library files instead of duplicating functionality in python.

Would solve #5

latest image breaks current version