I can add just a bit more info. That chip with code "AVNH" is probably 2019 to 2021 vintage.
Here is a photo of a newer chip with "AAUY" sitting on the NXP packaging label with date code 2325 and lot code info.
At the very least, hopefully...
I only know how to read the first line, where M2T5 identifies the part number as MKL02Z32 (the last character is number '5' not letter 'S').
On this chip, I have no idea how to interpret "AVNH". I suspect it is the date code and maybe more...
Except … a “small cheap purple board from AliExpress” might, just possibly, have a knock-off copy of the PCM5102 which doesn’t comply with the official datasheet…
I would like to add my two-penneth.
As I see it groups of pins have many particular functions.
Might it not be a good idea to also route the pins to functional connectors. It is likely that some connectors will have an overlap of pins. That does...
Go ahead and be picky. I appreciate it. I used to work at the Nucular Regulatory Commision on seismic saftey of reactors. . Now that was pickey.
I like the seismometer with laser sensors. That is a class act!
I do not know how the more...
Doesn't seem to be anything to do with the chip, which only enters power-save if the I2S clocks go away or are wrong.
Adding a constant fixed offset to output _after_ the envelope shouldn't have any effect on the sound as the output is AC...
@Paul I have a question. I am looking at a teensy 4.1, and would like to decipher the manufacture date of the bootloader. Do the letters on either side of (what I'm assuming is) the 4 digit date code mean anything important, or are they simply...
Tom:
I apologize for the appearance of being nit-picky. I come from an Aerospace background were our measuring circuitry had to be at least 1000 times better (in every way) than that which we were measuring. My best friend and mentor Paul...
I would like to add my two-penneth.
As I see it groups of pins have many particular functions.
Might it not be a good idea to also route the pins to functional connectors. It is likely that some connectors will have an overlap of pins. That does...
Quick update, I am now actually capturing some of the JPG images using DMA :D
More or less along the line I mentioned. A few wrong turns here and there but the
MATCH shifter finds the match, and it's callback enables the main shifters Interrupt...
Last year was an odd numbered year so it was safe. I believe the bug offsets all leap years by two, so any dates after the end of February in even numbered years will be incorrect.
Quick update, I am now actually capturing some of the JPG images using DMA :D
More or less along the line I mentioned. A few wrong turns here and there but the
MATCH shifter finds the match, and it's callback enables the main shifters Interrupt...
Ed
Thanks for the info. Conviniently, in this application, processing of the data is post collection. I think that will help. These signals are "tame" audio of realtively constatn magnitude. Frequency varies over a known relatively tight...
MTP is able to access the SD card in the audio adapter as well as the built-in SD card. Due to having 4 bits for data transfer, the built-in SD card is slightly faster, but MTP can access any file system object. Within the LittleFS code, there...
Generally if you are going to be using USB host for things like USB sticks a Teensy 4.1 will be easier to deal with because it has 5 standard 2.54mm holes on the inside that you can solder a USB A cable to attach devices. With the Teensy 4.0...
MTP is able to access the SD card in the audio adapter as well as the built-in SD card. Due to having 4 bits for data transfer, the built-in SD card is slightly faster, but MTP can access any file system object. Within the LittleFS code, there...
I'm working on a polyphonic synthesizer project using a Teensy 4.1 and a PCM5102a DAC (the small cheap purple boards from AliExpress). I noticed a slight tick / pop at the beginning of each note when using a slow attack / release. The volume of...
Sorry, from my standpoint, not much I can add, I think those of you who are using these boards to potentially create some new products or the like need to finalize.
But: if it were me, I would probably continue with your existing pins plus fill...
I am ready to make a DevBoard Gen 5, as soon as I get a list of pins. I'll let you guys sort out what functions are needed. My goal is to allow all your ideas to become reality. When I sall "all", I mean all of you who got a Gen 4 board. As you...
Sorry, from my standpoint, not much I can add, I think those of you who are using these boards to potentially create some new products or the like need to finalize.
But: if it were me, I would probably continue with your existing pins plus fill...
Hi everyone !
I'm also on this project and I have a problem. When I lift up the phone, the program doesn't detect it every time. Sometimes it works, sometimes it doesn't. But, it always detect when I replace the phone. I checked the mold and...
I am ready to make a DevBoard Gen 5, as soon as I get a list of pins. I'll let you guys sort out what functions are needed. My goal is to allow all your ideas to become reality. When I sall "all", I mean all of you who got a Gen 4 board. As you...
I am ready to make a DevBoard Gen 5, as soon as I get a list of pins. I'll let you guys sort out what functions are needed. My goal is to allow all your ideas to become reality. When I sall "all", I mean all of you who got a Gen 4 board. As you...
In my personal experience, I have used audio interfaces very successfully as data acquisition devices. The key is to be aware of the limitations:
* Your signals must be AC...most audio interfaces are not DC coupled
* Audio interfaces aren't...
Thanks all for your advices !
@MichaelMeissner can the Audio Adapter board read/write on the SD of the Teensy 4.1 ? (I imagine MTP access is only possible for Teensy 4.1 built-in SD card and not the SD card on the Audio Adapter board)
As requested, I've deleted the schematic and photos.
Did you watch the voltage and current while working with the unresponsive hardware? Make any progress?
@Thundercat - Awesome having those Teensy units return to some degree of function - so not burned up or totally destroyed. @KurtE recently reposted the Pin_Test we worked out that allows seeing each pin tapped to GND or 3.3V in turn to verify...
I cleaned the boards really well to remove any suspicious "no clean" flux from them. @defragster, I did your suggestion of first holding the button in prior to inserting the USB cable, and then counting about 16 seconds. No flashing red light...
Other than the voltage the RS232 protocol is the same the standard uart protocol only with the bits inverted.
So Serial1.begin(57600,SERIAL_8N1_RXINV_TXINV); should configure serial port 1 to be compatible with the signals you are getting.
Yes, that’s one way of looking at it.
The return value from write() is easy enough to cast, but read() and many of the bool-returning functions destroy the value. This is in LittleFS.h.
One of these days, I should submit a PR to at least set...
Would it be a good idea to provide a mechanism for error handling with a callback that converts error codes of the used filesystem library to error codes that are understood by my library or by SQLite?
I could provide default callbacks for some...
This is a bug in makeTime(), in Time.cpp in the Teensyduino core library. It is miscalculating leap years when converting from an expanded time (DateTimeFields) to unix time.
I will send a pull request to Paul's github with a suggested fix.
For...
Ed
Thank you very much! This is very much a stop gap measure. I am operating with a "optimize later" philosophy.
I agree with you re that the eventual digitization should be with a dedicated chip. I have quite a few ADS8866s around. They...
Thanks. Any way to get back to a post from a couple days ago to edit? Sensitive info. Perhaps an admin can help...I can't seem to find a link to contact an admin...
Thanks for support,
Mike