Re: RA8875 display problems with T4.x - a visual study
¿ªÔÆÌåÓýHave you got a block diagram of this/ signal flows.? Its something to contemplate vs. a FPGA and a Teensy.? I¡¯m formulating my next steps and want to get the next step absolutely perfect. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of Mark J Culross
Sent: Tuesday, March 25, 2025 3:01 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] RA8875 display problems with T4.x - a visual study ? Greg et al: ? The TMPS previously had noise induced in the audio chain by the display interface when everything was managed by a single Teensy (touching the screen & changing onscreen objects caused a high-pitched whine in the audio...the audio was also interrupted/delayed by the same actions).? That's the primary reason why I split the functionality across two Teensy processors, as well as spreading/reducing the RAM consumption & spreading/reducing the processor load.? Now that the audio & display are on separate Teensy processors, there is absolutely no detectable noise in the generated audio stream & everything executes in real time, so problem(s) solved. ? Mark J Culross KD5RXT ? ?
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