 Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me. |
Forum Index : Microcontroller and PC projects : PicoMite: Another PLAY SOUND bug ?
  Page 2 of 2 |
|||||
| Author | Message | ||||
| mozzie Regular Member  Joined: 15/06/2020 Location: AustraliaPosts: 68 |
@Stanleyella That filter does work exceedingly well, I too have just put one together and it is far better than any of the other R/C filters mentioned. As Volhout suggests, try some music but can I suggest posting the results in the Low Pass Filter thread that has been started. @Phil99 The PWM block in the RP2040 does have registers for phase control but not for the individual outputs of a single slice (if I'm reading it correctly) so only logical inversion of each output is possible. Using Address &h40050000 (PWM0 control register) &h01 is normal mode &h05 is Invert output A &h09 is Invert output B This also assumes that the MMbasic program doesn't re-write this value at some given time and reset it, only Peter or someone who can read the source code can answer that, hence the reason for the original question. So far its been fine. I found the info in the datasheet, but as JohnS suggests, there will be info out there on the interwebs. Regards, Lyle. |
||||
phil99 Guru  Joined: 11/02/2018 Location: AustraliaPosts: 2141 |
Thanks Mozzie and JohnS for the information. |
||||
homa Guru Joined: 05/11/2021 Location: GermanyPosts: 351 |
Hello, the days I finally had time to build the sound output (low pass filter) for the PicoMite VGA. Picture 1, 2 and 3: .jpg) .jpg) .jpg) Question to @Stanleyella: Is the used 3.5 mm stereo socket as in the picture of you to use immediately without modification on the breadboard of you? On mine (https://www.reichelt.de/klinkeneinbaubuchse-3-5-mm-stereo-ebs-35-p7301.html) I had to clip off pins and drill additional holes beside the pitch :-( The sound quality is as noted really very good. However, there are short noise at the beginning of a wav playback. Also, the output on the mixer is very noisy. The gain must remain quite low. I have here a recording as an example: PlaySoundNoise.zip  Is it possible to improve this behavior? I still saw these threads: https://www.thebackshed.com/forum/ViewTopic.php?FID=16&TID=15758 https://www.thebackshed.com/forum/ViewTopic.php?FID=16&TID=15716 https://www.thebackshed.com/forum/ViewTopic.php?FID=16&TID=15771 I also had the question ... https://www.thebackshed.com/forum/ViewTopic.php?FID=16&TID=15748 Greetings Matthias Edited 2023-03-30 06:49 by homa |
||||
| Page 2 of 2 |
|||||
 Print this page |
