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thwill

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Joined: 16/09/2019
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Posted: 03:17pm 26 Mar 2023

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Hi Peter,

I assume I'm just having some sort of mental breakdown, but with b28:

Option Base 0
Option Explicit On
Option Default None

' Why (if uncommented) does this do nothing ?
'Play Sound 1,B,S,256,25
'Do : Pause 1000 : Loop

' But this play Middle-C ?
Do
Play Sound 1,B,S,256,25
Pause 1000
Loop

Best wishes,

Tom

Game*Mite, CMM2 Welcome Tape, Creaky old text adventures

matherp
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Posted: 03:27pm 26 Mar 2023

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Works for me

thwill

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Posted: 03:37pm 26 Mar 2023

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Seriously,

I can see on the scope that it's doing nothing:

Play Sound 1,B,S,256,25
Do : Pause 1000 : Loop

> option list
PicoMite MMBasic Version 5.07.07b28
OPTION SYSTEM SPI GP18,GP19,GP16
OPTION CPUSPEED (KHz) 252000
OPTION LCDPANEL ILI9341, RLANDSCAPE,GP20,GP21,GP17
OPTION SDCARD GP22
OPTION AUDIO GP6,GP7, ON PWM CHANNEL 3

Best wishes,

Tom

Game*Mite, CMM2 Welcome Tape, Creaky old text adventures

hitsware2

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Joined: 03/08/2019
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Posted: 04:15pm 26 Mar 2023

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Doesn't

Do : Pause 1000 : Loop

Simply loop the pause 1000 ?

my site

thwill

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Posts: 4047

Posted: 04:20pm 26 Mar 2023

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hitsware2 said Doesn't

Do : Pause 1000 : Loop

Simply loop the pause 1000 ?

Yes it does, I'm just doing something so the program doesn't end. The behaviour is the same (no tone) with just DO : LOOP after the PLAY SOUND.

Best wishes,

Tom

Game*Mite, CMM2 Welcome Tape, Creaky old text adventures

matherp
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Posted: 04:29pm 26 Mar 2023

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PicoMite.zip

thwill

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Posted: 04:52pm 26 Mar 2023

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matherp said PicoMite.zip

Quick test ... same nothing.

Will try again later or tomorrow, but my free time has expired for the moment, need to feed the troops.

Best wishes,

Tom

Game*Mite, CMM2 Welcome Tape, Creaky old text adventures

matherp
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Posted: 05:53pm 26 Mar 2023

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Oops - sorry, wrong version

PicoMite.zip

thwill

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Posted: 08:11pm 26 Mar 2023

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Thanks Peter, that fixes the issue

.

Tom

Game*Mite, CMM2 Welcome Tape, Creaky old text adventures

mozzie
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Joined: 15/06/2020
Location: Australia
Posts: 68

Posted: 02:06pm 27 Mar 2023

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G'day Peter
I may be asking a bit much from the play sound function, but if I attempt to run two white noise sources:
>Play Sound 1,b,n,1
>Play Sound 2,b,n,2
The Pico locks up / requires power cycle.

Also 3 tones plus white noise source:
>Play Sound 1,b,n,1
>Play Sound 2,b,t,420
>Play Sound 3,b,t,525
>Play Sound 4,b,t,740
The Pico locks up / requires power cycle.

If only the left channel is used it functions as normal.

Only require 2 white noise sources to increase output modulation, am I correct in thinking the output is 25% for 1 sound, 50% for 2, 75% for 3 and 100% for all 4?

I imagine there is a fair bit going on in the background to get 8 signals across 2 channels (4x2) simultaneously at 44Khz PWM, including all the lookup table calls etc.
Not surprising the processor load is fairly high

Can you please also advise if you think inverting the 2nd channel:
Poke Short &h40050000,&h09
Is likely to cause any problems.

Running PicoMite 5.070729 but also 5.070728 is the same.

Regards,
Lyle.
Edited 2023-03-28 00:10 by mozzie

matherp
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Posted: 02:52pm 27 Mar 2023

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Mozzie - what happens at 252MHz CPU speed?

mozzie
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Posted: 09:14am 28 Mar 2023

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Cheers Peter,
Can confirm at 252MHz 3 white noise sources in parallel or 1 white noise plus 3 sine or triangle.
Also tried 315MHz and 4 white noise or any combination of types.

The answer should have been "jumping off the screen" but couldn't see the woods for the trees

Thanks again for the excellent work .

Regards,
Lyle.

P.S. so far using Poke Short &h40050000,&h09 to invert the output is working ok but I'll keep testing.

matherp
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Posted: 09:17am 28 Mar 2023

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Quote Can confirm at 252MHz 3 white noise sources in parallel or 1 white noise plus 3 sine or triangle.
Also tried 315MHz and 4 white noise or any combination of types.

Have found a fix at normal clock speed 4*noise now works fine on both channels. Watch for b29 being posted

mozzie
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Posted: 09:32am 28 Mar 2023

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Cheers Peter,

Maybe a thought / suggestion for a later time...
The ability to allow a single Play Sound output at 100% modulation to match play tone, I realise this may take significant work to ensure that if more than 1 sound is running the output is not overdriven, I currently run 1-3 in parallel so not really needed but would be handy.

Thanks again.
Regards,
Lyle.

phil99

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Posted: 11:37am 28 Mar 2023

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"so far using Poke Short &h40050000,&h09 to invert the output is working ok"

@mozzie
Also works with beta 10.
Are other phase shifts possible? If so it could also be useful for non-audio applications.
A variable speed inverter for a split-phase motor would need 90 deg. An open delta inverter for a 3 phase motor would need 60 deg.

Even if it is only possible to get 180 deg. it would still be handy for a single phase unit.

matherp
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Posted: 11:42am 28 Mar 2023

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Quote Are other phase shifts possible? If so it could also be useful for non-audio applications.
A variable speed inverter for a split-phase motor would need 90 deg. An open delta inverter for a 3 phase motor would need 60 deg.

Even if it is only possible to get 180 deg. it would still be handy for a single phase unit.

This is all already covered in enhancements to the PWM command in the 7.07.07 betas.

Quote The PWM command is modified as follows:

PWM channel, frequency, [dutyA] [,dutyB] [,phase] [,deferredstart]

Phase is a new parameter that causes the waveforms to be centred such that a wave form with a shorter duty cycle starts and ends equal times from a longer one. Use 1 to enable this mode and 0 (or omit) to run as normal

The new parameter "deferredstart" when set to 1 prepares the PWM channels as before but does not start the output running. This is to avoid any undesirable startup artefacts

There is a new sub command

PWM SYNC [channel0offset] [,channel1offset] .......[channel7offset]

This initiates the PWM on channels where a deferred start was defined or just syncs exisitng running channels. However, the power comes in the ability to offset the channels one to another (defined as a percentage of the time period as per the duty cycle - can be a float)
You can use an offset of -1 to omit a channel from the synch
Using a negative value for the duty cycle will invert the signal

Edited 2023-03-28 21:58 by matherp

phil99

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Posted: 12:14pm 28 Mar 2023

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Yes it is, and thankyou for that.
It is excellent for modified square wave inverters of all types. Play Tone makes sine wave inverters a piece of cake. Output feedback goes to Play Volume. The 180 deg. trick makes H-bridge driving easier.
More phase shifts would open up more possibilities so was interested to know if Poking other values would work. If not I don't expect you to modify the code. Very few people would use it.

PS. Thanks for the Library. That will be useful to many people.

JohnS
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Posted: 02:09pm 28 Mar 2023

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&h40050000 is (in C) 0x40050000 which is PWM_BASE in RP2040 datasheet

See 4.5.3 for the registers.

The web has comments on using the registers, too, e.g. search on
Pico 0x40050000
or
RP2040 0x40050000

John
Edited 2023-03-29 00:10 by JohnS

stanleyella

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Posted: 03:29pm 28 Mar 2023

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4.7mH inductors arrived today so built the low pass filter and tried play tone 1000,500,2000
it worked!
Check the photos of the ebay £14 stereo, runs off battery/usb, rechargable. Womans voice says blue tooth mode when turned on then pressing mode says fm mode, pressing again says a u x mode which I'm using, next says u s b mode. Great for the price.
I didn't have the caps for the filter so
68nF was 47nF + 22nF in parallel.
33nF was 22nF + 10nF in parallel,
2.7nF was 2.2nF+ (1nF + 1nF in series) in parallel,
would have been simpler with the right caps... see the photo
but sounds seem ok, I'm happy my soldering with my vision it worked.

Volhout
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Posts: 4256

Posted: 03:57pm 28 Mar 2023

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Copy some cd music to the sd card. You'll be surprised of the sound quality of this 4 dollar pico.

Volhout

PicomiteVGA PETSCII ROBOTS

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