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Forum Index : Microcontroller and PC projects : MMX play wav and tts issue

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astro1
Regular Member

Joined: 26/06/2016
Location: Australia
Posts: 53

Posted: 12:51am 11 Mar 2018

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Anyone seeing a problem with the audio results, where is plays a lot faster from a tts command after doing a play wav? It seems like play defaults for tts gets changed.
I then tried tts with a speed of 225, which plays a little better, but then I loose comms. No response in Tera Term, LED on PIC16F1455 does flash on a key stroke. Need to do a reset to recover.
Using latest version off firmware/144.

matherp
Guru

Joined: 11/12/2012
Location: United Kingdom
Posts: 10569

Posted: 08:25am 11 Mar 2018

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Didn't think anyone was playing with TTS after an initial try so haven't tested it for ages - I'll have a look and see if I can find the problem

UPDATE
Found the issue

When playing a WAV file the code checks whether the WAV is mono or stereo and sets a parameter accordingly. This tells the interrupt routine that outputs the sound whether to copy one channel to the other or read both from the input. The TTS command is of course mono but wasn't resetting the parameter so if the last WAV played was stereo then the TTS output was double proper speed - AND it read past the end of the buffer by a factor of 2 - causing the crash.

I'll post a fix in the next couple of daysEdited by matherp 2018-03-13

astro1
Regular Member

Joined: 26/06/2016
Location: Australia
Posts: 53

Posted: 04:06am 24 Mar 2018

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Working now. Refer to;
Topic: MMX Help needed. Posted: 23 March 2018 at 8:12pm
2018-03-23_201142_MMX5.04.15.zip

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