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Hello Paul, As for the distance between the two NRF modules, I actually placed them side by side to perform the speed tests I did. I don't think that is the problem in this case. As for the originality of my NRF...

Hello Gerad, I did use an external power supply to power the NRFs at 3.3v. But there was no difference in the data rate.

Same problem, but only for some mice/kbs. Bump.

@ deelaleo You might also want to take a look at MicroBox. It is a Linux like shell that what written for use with Arduino. http://sebastian-duell.de/en/microbox/index.html What's kind of interesting about it...

Thanks for the reply. Most of the code size comes from the libraries I used, not the code I wrote. I know I can put the FLASHMEM prefix to library functions, but libraries like LVGL are so large that it would not be...

Hmm, may be a Raspbian issue then? Will try switching if the eeprom update doesnt work

Thanks Nominal Animal, I'll give that a go.

Since the NRF24L01 operates on the 2.4GHz ISM band, you have to share that medium with all present WiFi traffic. That could be one of the issues for the low throughput. Another factor could be the physical distance...

Putting "FLASHMEM" as a prefix to the function prototype will have it reside in FLASH. This example from PJRC's Startup.c for example: FLASHMEM void configure_external_ram() { ... } Start with any one time...

Hi Ibrahim, Did you provide a "special" power supply for the NRF? They are somewhat sensible to this point, and this could be a problem. There is some small power shield specially designed for this purpose. Well,...

See here https://github.com/luni64/TeensyTimerTool/wiki/Basic-Usage#finding-out-the-maximum-timer-period for information how to find out the max supported timer period for the various hard/software timers available. ...

Guess there is no interest in such usage for the Teensy? Still searching for something to use as starting point but I guess I can start getting a simple UI running with micropython maybe. That should be simple enough to...

Thanks, will take a look at RunCPM and will check the project blog. It does not need to be necessarily like DOS btw; I wish there was a simplified Linux terminal OS of some sort, that would basically act like if it...

FastCRC and the website also agree when given the input as a character string. /* FastCRC-Example (c) Frank Boesing 2014 */ #include <FastCRC.h> FastCRC8 CRC8;

You have to encode those 24 bits as 3 bytes - in hex they are 0x64,0x29,0x22. This website gives 0x93 as the CRC8 of those three bytes. FastCRC agrees: /* FastCRC-Example (c) Frank Boesing 2014 */ #include...

You appear to be generating a CRC on 24 bytes, or 192 bits; not on 3 bytes or 24 bits. Could the data just be int8 type. Why is it in a string? If it needs to be in a string, you could write a function to...

Thanks for pointing that out. I'm sure that's the issue. I'll try that and report back.

I am using the CRC8 example for FastCRC and comparing it to an online calculator that calculates the crc from a binary set of numbers. Poly = x8 + x2 + x1 + 1 I don't get the same results. /* ...

Yeah, been thinking that myself. Oh well, back to the way it was. Thanks for your help Joe. Cheers NM

I can understand the desire to have timers with callbacks, but it sounds like you may not have all of the necessary logic to stop/start/reset those timers when events occur, such as pushing a button. The timers are nice...

Post the code you used to test the CRC. Pete

To be sure, for I2C you need a bi-directional voltage translator to handle I2C. I.e. you have to boost the signals from the Teensy from 3.3v to 5v, and you need to lower the signal from the I2C devices to the Teensy...

Hi Joe, i am looking to use a callback routine instead of polling using elapsedMillis if i can. I've been weeding elapsedMillis/Micros out of my project and if i can get this working it'll stay out.. I had been...

The default clock frequency for T4.x GPT and PIT timers in TeensyTimerTool is 24 MHz, so max period in 32 bits is (2^32)/24e6 = 178.95697 seconds. There are both 32- and 64-bit software-based timers (TCK). At 64 bits,...

Returned... now to find a 20x4 LCD that actually works good. I re-arranged the PCB so I can use Wire0 to make code use simpler, and then ran the clock and data lines through a voltage translator to boost them to 5v.

p.s. i've been able to determine that the largest value i can put into timeoutMillis is 178,956 which is 178,956,000 when it is put into the timeoutTimer.trigger(); function. Any values larger than this cause the...

Hi Luni, I'm using the TTT in one-shot mode to manage a screen timeout on an attached OLED but it isn't behaving as expected. I've used the following code (this is just part of my code, not all of it) ...

You can set the CPU Frequency from the Tools menu of Arduino IDE. Nominal frequency for T3.6 is 180 MHz. For the T4.1, the closest setting is 150 MHz, so you could try that. Do your PID loops run at a fixed frequency...

I have. I did this sort of an exercise to see how it would work out. I think it would make much more sense to use the audio board. The readme on github has a fairly good explaination of the project. ...

Is there a way to slow the t4.1 down to the same speed as the t3.6 ? I am using the board to count encoder pulses and perform pid motor control The timing seems to be wrong with the T4.1 Can you recommend a...

Ears have been burning again, been re-writing project codebase. Noted a thread about encoders and Midi. Here is the essence of what my project does with EncPlex. Variations tested on T3.2 - T4.1, Usb Type = MIDI....

To use other SPI ports, see lines 54-57 in the SdFat_Usage example: https://github.com/PaulStoffregen/SD/blob/97ca5355b19095d9956fea902eb8f85eca312a4b/examples/SdFat_Usage/SdFat_Usage.ino#L54

Is this feasible? What would be the downside?

Board arrived today! The timing looks much better. Pleased so far. < 500 ns count is 999999 < 750 ns count is 1 < 1000 ns count is 0 < 1500 ns count is 0 .... Sum of counts is 1000000

With the SD library with SPI1 and SPI2... Look at the Examples->SD->SdFat_Usage example It shows some example on how to do things like that, including: //ok = SD.sdfs.begin(SdSpiConfig(chipSelect, SHARED_SPI,...

Excellent news! You’re very welcome - that’s one of the things a forum is for…

I am completely re-breadboarding the whole project, and drawing the circuit diagram as I go to post here. I decided maybe the better option was to utilise the SPI1 and SPI2 ports on the Teensy 4, but now not so sure...

Make sure you have the latest VLI firmware installed (for the VIA USB chipset), by installing rpi-eeprom,     sudo apt install rpi-eeprom then rebooting the 'Pi, and finally running rpi-eeprom-update,     sudo...

Thanks, you are right it is much more simple and efficient why I don't think to that :rolleyes:

With DC motor power -> no motion Power Slave Teensy -> no motion Remove power from Slave teensy -> still no motion Yes, it appears that only after the master-slave connection do the motors (controlled by the slave)...

Your code above did not work for me. I had to add delay(10) to the loop. But your code can be simpler. Just divide the myEnc.read() by 4. And then check for the difference being positive or negative. #include...

Seems details on the hardware controllers, motors and connections may be needed for related answers. Wondering: If Master, Slave, DC unpowered:: > Plug in DC motor power: results? > Then power Slave Teensy:...

Hi Paul, my apologizes for my misstake in midi I accidentaly activate the midi output on teensy port after disable output to teensy midi port all work OK. For info I write this code to send midi only when +4 or -4...

Here is a version of the previous that has been simplified to reduce it to 2881 KB. I took out the silkscreen features and also some internal features of the microsd card and usb port

I copied the 1.57 beta 3 output_spdif3.cpp file to overwrite the 1.56 version and then my S/PDIF output was glitch free. Thanks so much!

I think I'll just return it and look for another with a more standard chipset.

Replacing the Teensy 3.2 by a Teensy 4.1 and running your exact code gave the same flawless results as in my post #9. Paul

Good luck. I know at least with some RPI like TFT displays I have played with. They roll their own and maybe don't use any standard chipset like the SSD...

Thanks, I'll take a look at that. This one was sold by RPIGear. I'm trying to find out what chipset it uses (on the underside of the backpack) and is a 20 pin chip. A 2004A display with possibly a PIC16LF1829-I/SS...

Obviously it will depend on which display you are trying to use... But for example SSD1306 - I would try Adafruit_SSD1306 They have a constructor: Adafruit_SSD1306(uint8_t w, uint8_t h, TwoWire *twi = &Wire, ...

Good morning all (at least my time zone)... So far I have not seen the SD Pull Request (https://github.com/PaulStoffregen/SD/pull/43) has not been merged. I am debugging this now. Note sometimes it works.......

Think the contrast is excellent for such a small display and the off-axis performance good as well - titled it about 80 deg (just a guess) and was still able to see the display clearly.

I pushed your updated version to the repository along with the tft_picture_viewer sketch you updated for the GC9A01 display.

@defragster - sorry just saw the post. Yes @KurtE incorporated those changes into his fork of the SD library. Not sure if its been incorporated into Paul's master SD yet?

Actually I'm using the much older MSF-XINPUT which seems to be the basis for the ones you link. I should probably start with changing the library altogether :). I don't remember editing core files last time but I...

I have not much experience with MIDI. Just wondering if it is OK to send those messages every 10ms? The encoder library will generate a lot of fast up/down counts if the encoder bounces (which is very likely). So, your...

If the serial monitor shows correct counting of the encoder, than the encoder is fine. I see 4 counts per detent of the rotary encoder. Is it possible for you to make a photo that shows your wiring of Teensy and...

RunCPM runs nicely on a 4.1. A 100MHz+ Z80 running CP/M.

You might browse Blog Project Submission where a variety of emulators have appeared. Seem to recall one doing Dos.

I have an RPI 4 running Ubuntu 2204, I programmed a T4 with the sketch installed evtest... It has been running maybe 30 minutes and every time I jumper from T2 or T3 to GND I receive the events for 9002 or 9903...

Yes, the decimal part is discarded when converting the float result to an integer, but 0.5 is added. The modulo value will be <= 64434 as long as 150M/Freq < 65534.5

Maybe I am missing something. Using Serial.printf("%.2f°C\n", tempmonGetTemp()) to monitor the T4.1 I get Tjunction = 74degrees C. It is a pretty full application using two TDM interfaces, a TFT display and a few...

It looks like it rounds down before reaching a modulo. 150Mhz / 2288.88 hz = 65534.235 which is greater than 65534 but equal to when the decimal point is thrown away. I haven't tried 2288.85 yet to see what the LED...

This failed, so it's on to checking the hardware, now.

Great idea! I considered that was a likely issue as well, as I could tell if just hard locks if it fails. And yeah, I'll do all the physical diagnostics as well. Edit: it did not help so far, other than I can now see...

The boilerplate SD startup code in most of the demos (and which you've essentially copied) is poorly conceived, in that it gives the card just one chance to start, then whinges about it forever. I have an SD card which...

It was literally working when connected to my laptop before, I changed nothing other than taking it with me somewhere else and back home, and now it's no longer working, and it has never worked on any other USB power...

I don't use Platformio myself, so no real idea, but your suggestion of installing the Arduino beta then copying the required change across sounds viable. The only changed file you'd need to fix your stated issue this is...

You could try running File > Examples > SD > CardInfo to check if the hardware is detecting your card.

I've been looking into this yesterday too. In the examples menu there are options that show all the wake up modes. I'm just going to try the code and see what happens.

Hard to know... For example how is your Audio Shield hooked up? Is it the proper Audio Shield for the Teensy 4.x? What is: SDCARD_CS_PIN set to? I am assuming pin 10? Are there other things on your SPI buss?

Thanks, my guess then is: If you updated your Teensyduino version, it overwrote your changes to the core files. Look at the Readme file of: https://github.com/dmadison/ArduinoXInput_Teensy file and it talks...

Thanks! Seems like the snooze library can be useful too.

thank you for the test. It is very strange, I have same configuration, only teensy model change. When I comment "usbMIDI.sendControlChange(1, 64, 1);" serial display the position of encoder and it work properly...