Cannot use SDK PWM

[patrickjahns]

In relation to #836 I`ve been trying to use the PWM functions provided by the sdk

I included the header file with
`extern "C" {

include "pwm.h"

}`

Trying to initialize it in setup() with
pwm_start();

Linker complains that it can`t find pwm_init() function ??

build1c4a41795fe117f0cc67c7576913ee7e.tmp\sketch\CallSDKFunctions.ino.cpp.o: In function 'setup':
CallSDKFunctions.ino:24: undefined reference to `pwm_start'

Latest Staging Version 2.1-rc2

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[patrickjahns]

Managed to include it by changing the linker flags and adding lpwm.

But it won`t run smoothly - experiencing constant watchdog resets - did anyone else try this already?

[kaeferfreund]

@patrickjahns how did you proceed to include the sdk pwm into the sketch?

[patrickjahns]

@kaeferfreund

I changed the build files to include lpwm library - but a stated - it won't run. As soon as I initialized it - the esp would reset. I`ve been using the code from the espressif iot_sdk example.

After trying everything that came to my mind I switched to a different framework (SMING) for the time being. The same code works there without problems

[ge0rg]

The crash problem should be fixed as of 234a874 - I tried to run the PWM code I had trouble with in #836, however so far all my channels remain dark. Will need to play around a little more.

[patrickjahns]

Thanks for the information - I migrated my code to utilize a different framework (SMING) since it required hardware pwm. I`d be curious to know if you manage to get it working.

I utilized the esp8266 pwm output in this library of mine:
https://github.com/patrickjahns/RGBWWLed/blob/master/RGBWWLedOutput.cpp

You probably need to change the EspDigitalPins part to match the arduinowiring
Also i found the iot example from espressif also a good start for working with pwm

If you can confirm it working - i probably would polish the library to be SMING and Arduino SDK compatible

[ge0rg]

Yeah, I had ripped a large part of the IoT light demo and frankensteined it into my arduino project out of sheer despair, just to end up with a wdt reset.

Now, my code is running without resets, and I can see my logs over serial, as well as reactions to MQTT.

However, the RGB lines are all off, no matter which vaules I write (and I'm pretty sure the pins are properly configured, it's copy&paste from user_light.c).