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I dropped the opto isolator resistors to 82R (R4 and R6 - transmit and direction). DMX light randomly flashes occasionally. Something still screwy

However a big part of the optimisation is that I only process every other sensor reading as the requirements are not that great for this calculation. So every other time I process one sensor pair, and the next time I...

Sure: float CrossCorrelation::ComputeHead(int sensorID) { float max = 0.0f; //unrolled loop, the "0" is incremented every time as in a for loop m_targetSignal =...

I was thinking in terms of having the option to use different pins as chip select. D2-4 are also I2S2, so might well be wanted for an audio project. There aren’t many pins on a Teensy 4.0 that can’t be used for some...

Ah, didn't see. Can you show what's the current optimized version?

Yes I have. The code was co written by chatGPT in the first place.

I already did that if you read my comments above :) Thanks for the suggestion.

Aha... very cool. Thank you.

Yes, that is what the start code was and failed here. Forget the chip spec - and never tested for 'smallest usable' - but seems it wasn't asking for enough space and failing on the T_4.1 here. It takes at least...

Hi Paul, I just tried it with 1024*1024, and that works. It seems there is a minimum size that it needs. Can that be added to the documentation?

And when I set DATALENGTH * 1024, I get the filesys not ready message, probably because it is too big.

Hmmm. how interesting. The original code was DATALENGTH * 2 + 1024. The intent was one buffer and another 1K for overhead..

I kept getting this: not able to setup filesys Until I edited the code to this - replacing '+' with '*': if (!filesys.begin( DATALENGTH * 1024 ) ) { Serial.println( "not able to setup filesys" ); }

I just modified the program to load some values into the buffer, for the write() and then to zero the buffer before the read(). With that I can confirm that as far as read is concerned, the data was nt0 stored or read...

Then, I tried "quickformat". The command list files shows that the file has gone away. Save temp.txt, again creates an empty file. So, I feel confused. Why is write() not writing anything to the file?

So, it seems that the call file.write( pointer, number_of_bytes) creates the file but not write anything to it.

At startup it reports Space Used = 65536 Filesystem Size = 65536 After writing the file, save temp.txt, the list command produces the following. It shows that the file has been created, but the size is 0...

Command: save temp.txt Response: saved to temp.txt 4096 0 The first number is the number of bytes that were supposed to be written. The last number is the size returned by file.size() immediately after...

Just out of curiosity, have you tried asking openAI for suggestions on how to optimize it? That seems like it would be one of its ideal intended purposes.

Yes, this is a complete program. I copied it into Arduino and indeed it does compile. But the nature of this program is it does several different things depending on what text it receives. Without the specific...

You can if you would like to. I hope to get more time to gain experience with this. I am on vacation right now so I have some time. But I cannot guarantee that I will be able to work though it in a timely manner:)

This is an awesome guide! Want me to give you edit access to the Mbed wiki so you can improve the instructions there?

@anybody interested - Here is the first go at documenting the installation and usage procedure for MBED CE on the Teensy T40. May try to set it up on Windows 11 (maybe). MBED CE OS installation instructions for...

Hi! I hope you don't mind if I ask a few more questions: 1. When testing the WebServerAP example, I see that server.handleClient() consumes about 2.5 seconds of CPU time (in two ~1.2 second chunks) each time that the...

I'm using a J-LINK plus compact with the MOD on GND, and the teensy side of the flex connector connected to JTAG. Using J-Flash V7.84f, with device , NXP MIMXRT1062xxx6B selected and the JTAG settings on Auto, I can...

The WiFiWebServer that you referenced was written by the same guy as the ESP8266_AT_WebServer that I"m currently using. They seem to have similar capabilities, but there must be some critical difference that I'm not...

You could remove the second loop in NormalizeSignal() and just return the max, then perform the normalization while calculating the abs delta in ComputeManhattan().

Yes, there are three square waves instead of just the two used for quadrature encoders. And they trigger (edge and falling) in U V W order when going forward and W V U when going reverse. These BLDC motors are like the...

Pm sent jefftripz

Okay thank you! I added locations for the pulldowns. Can you please clarify "links to change the device selection lines." Is this just a naming thing, like I should use C0/C1/C2 instead of DO2/DO3/DO4? If so,...

Hello everybody! So, I noticed that there's a multiple joystick example in the Arduino Joystick Library examples. I modified it a bit and tried it on a Micro. #include <Joystick.h> #define JOYSTICK_COUNT 4 ...

Hi Paul - Me too. Based on the installation instructions, readme's and your post #28 I came up with the right sequence start to finish that seems to work. I have @manitou's post #32 working as well. Just tested the...

Might be a good idea to define the _teensy_model_identifier inside the linker script. Here's how we do it for Arduino builds: ...

no, i don't have the wav file on my sd card. the code i was using allowed me to record a greeting from the first pick up. i'll try a different USB cable as well and see if that gets me anywhere

Frank is still around, as mcu32 - maybe he’ll pipe up? If I were you I’d try to track for fitting pull-downs (you don’t have to fit them), and maybe some links to change the device selection lines from D2 to D4 to...

Each time I've looked at this over the last couple days, I also had to re-read a bunch of stuff just to figure out the build commands all over again. That's why I put the notes on msg #28. Still not 100% sure I really...

to increase the mic volume i changed this code values // Value in dB // sgtl5000_1.micGain(100); sgtl5000_1.micGain(35); // much lower gain is required for the AOM5024 electret capsule my value made the mic...

Thanks - I am new to Mbed and Cmake. I have a lot to learn. My bad:) Should have read all of the posts I guess...

It's a keyboard (13h839c0rbs) from a Gigabyte laptop P27GV2 (rebranded clevo w370).

I Tried adding more delay, more and more until it was slowing down my typing. The delay made no improvement. I think maybe it just got some oxidation from sitting while the laptop was not in use. I thought it would...

> Needed thew space before the '=' operator. Oops, pushed a fix! Odd, that worked with whatever version of ld I have... > The Ninja build command is not automatically being run. I have to run it separately. Is...

Can you clarify where you've made these changes? Was this line in your code, or in the FlexCAN library? I've had this same issue but didn't have time to investigate myself, and this appears to be the only thread I...

Hi everyone, here is the first draft of the Teensy 4.1 memory board with eight SPI memory chips. The MOSI and MISO connections are different than Frank's Teensy 3.x version, which seems to me to be necessary for the...

@MultipleMonomials - I have everything setup and successfully built the hello-world sketch. But ran into an error during the Ninja build with the linker script: ...

Hi Guys, no one else has a similar clicking noise problem? I can't figure it out and I'm running out of time, I want to give the phone as a gift. Any ideas would be much appreciated! Thx

Some hardware registers for T4.0 under mbed os 6. SystemCoreClock 528000000 11:38:27 Feb 8 2023 ok ArmPllClk 1056000000 AhbClk 528000000 RtcClk 32768 Usb1PllPfd0Clk 664615368 IpgClk 132000000 SemClk 176000000 ...

have you got a wav file on the sd card ???? i'm using a t4 with the Rev D audio shield make sure you are using a data type cable as i had same error compiling board for teensy and it was the cable first cable was...

one b4 mine /** * Audio Guestbook, Copyright (c) 2022 Playful Technology * * Tested using a Teensy 4.0 with Teensy Audio Shield, although should work * with minor modifications on other similar hardware ...

Yes, it uses the serial port, but only its TX pin. The RX pin remains unused by WS2812Serial.

i tried your code but it doesn't compile. i get errors for the playwav1 file. Arduino: 1.8.19 (Windows 10), TD: 1.57, Board: "Teensy 4.0, Serial + MTP Disk (Experimental), 150 MHz, Faster, US English, Bigger blocks...

Oh, I didn't notice that link from the OP. Well, I think the answer is no, there is no "built-in support" for this function. Looks like an interesting one.

look at post 218 thats the code im using cant get greeting message or replay to work at moment but it recording ok

Update, I used the following for mbed_app.json { "target_overrides": { "*": { "platform.stdio-baud-rate": 115200, "platform.stdio-buffered-serial": 1, ...

Nothing records after the first beep and nothing happens when I hit the hook switch after. I never get any other beeps or anything. I thought the code said 2 short beeps to record initial greeting. I could be wrong...

OK I updated mbed-ce-hello-world -- thanks Paul for the detailed git incantations. I built, loaded, and ran main.cpp. No mbed death flashing. ttyUSB0 showed up usb 1-3.4: new full-speed USB device number 37 using...

@BriComp - no I dont want to use the UART. The question is about how WS2812 functions - whether or not it engages UART as it has to run on one of the hardware serial ports..... I want to know if the associated recieve...

If you are using UART8 you should be using Serial8.begin(baudRate); Just look the the code for the serial ports - it set's everything up ready for transmission.

D12 (GPIO_B0_01) is on QTIMER 1 CHN 1 and does PWM with Teensy core, also see T4.0 pin map i'll do some UART testing shortly ...

https://forum.pjrc.com/threads/70822-Capacitive-Touch-with-Teensy-4-x?p=310542#post310542

If you look at the document provided you come up with this:-

Have a look at this. I think it will serve your needs. I have been thinking of using these. Basically they swap the ESP32 for the ESP8266, so more grunt! EDIT: Or for a little more power, consider this.

@defragster - yes the irq pin it needs to be read as an input. How about this based on your suggestion: #define SUB_PROCESSOR_IRQ 34 // RX8 // interrupt requrst pin to...

Comparing it to the image on the PJRC web site they are different.

Pin 35 may have TX8 function - but as used - it isn't doing UART Serial and would have no reason to associate Pin 34 to that use. Even if TX8 was in use for UART - the RX8 pin could be repurposed after the...

Here is a USB protocol analyzer capture of the failed USB enumeration And for reference, here is the beginning of a successful enumeration with Teensy programmed by Arduino+Teensyduino

Tried it. Not sure if I got everything set up correctly (see below). Building this time: Linking CXX executable HelloWorld.elf -- built: /tmp/mbed-ce-hello-world/build/HelloWorld.bin -- built:...

bueller......

After the 1 long beep try saying something as thats when it records the message if you press the hook switch you would get 4 short beeps if you still got handset to ur ear at momonent i cant get the greeting message to...

Aha! I was able to reproduce and diagnose a crash when activating BufferedSerial on pins D1 and D0 using my MIMXRT1050 dev kit. It turns out that, for some reason, the original Mbed port didn't define interrupt...

Hopefully :) ... Should be clearer with the localized link and avoid TLDR reference issues.

Ah, I figured out the mystery of the ncache initialization crashing. Turns out that you were right, that section specifically was still being put into the SEMC due to some weird linker script hijinks. I combined it...

Ok, I've rearranged the text on that page. I also added a "Software" heading. https://www.pjrc.com/store/display_ili9341_touch.html Hopefully having the first 2 blue links as the 2 required libraries, and then...

Brilliant, thanks, Paul! The beta DL was timing out, but I’ll give it some more time tomorrow. I appreciate the troubleshooting.

When using both I2S input and output, Teensy transmits 3 clocks: MCLK, BCLK, LRCLK which are routed to both ADC and DAC. So the answer is yes, or probably yes, if your chips are I2S or something similar. Audio...

Normally FLASHMEM is meant to be used on the function definition, the place with the function's actual source code, like I tried to show in msg #2. For C++ classes, normally it would go on the actual member function...

Thank you both.

For MacOS Ventura, you need 1.58-beta3. If you wish to use the old Arduino 1.8 IDE, download it here. Get the "MacOS (Catalina to Ventura)" and of course do not get "Old MacOS (??? to Mojave)" since you have...

Even if you have the original source code, how much work is needed to get it running on a different board really depends on how it was written. If it mostly uses Arduino functions like pinMode and digitalWrite, it...

Teensy 3.x and 4.x both have various timer peripherals that can count edges or measure time between edges. I'm not sure what you mean by "three phase encoder". Do you mean 3 signal outputs. Are they A/B (quadrature) and...

If you only have the hex file, no. If you have the source files (ino, cpp, etc.), maybe.