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Forum Index : Microcontroller and PC projects : PicoMite: PWM - Invalid frequency
| Author | Message | ||||
thwill Guru  Joined: 16/09/2019 Location: United KingdomPosts: 4047 |
Hi Peter, I know this used to work, up until very recently, as I was using this frequency (with volume 0) when I needed to play a "rest" on my handheld: > pwm 2,15.43,0 Error : Invalid frequency Note that 15.43 Hz is the note below bottom-C. Obviously I can "fix" my code but: 1. Is there a reason for this limitation ? 2. When was the limitation added ? I could swear it was working one week and then not the next week without my having updated the firmware inbetween - obviously that isn't what happened, but still  .Best wishes, Tom Edited 2023-03-19 18:40 by thwill Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 9139 |
You are running at a greater cpu frequency than before |
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| thwill Guru Joined: 16/09/2019 Location: United KingdomPosts: 4047 |
Thanks Peter. You are correct of course and that fixed the problem. I could have sworn I had already tried that already though after I read the source - getting old is no fun, and by the demographics of TBS I'm barely halfway there.Best wishes, Tom Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 2141 |
From the manual. Minimum frequency = (cpuspeed + 1) / (2^24) Hz. Maximum speed is OPTION CPUSPEED/4. At very fast speeds the duty cycles will be increasingly limited. |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6814 |
Welcome to my world.... ;) Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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