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For a project where I need to measure an inductor (detection loop) at 60kHz, I plan to use RMS to DC converters: one to measure voltage across de inductor, and one to measure current across a sense resistor. Then measure phase between voltage and current with two zero crossing detectors to...

If encoder is "mechanical", a small R-C filter helps remove the possible oscillations due to bouncing contacts. The classic implementation is a pull-up on the contact side, followed by a R-C. A good explanation I just found: https://www.dream-dimensions.de/2015/10/using-rotary-encoders/

I have no problem with this. It is totally normal to ask money for your wok. It was only to be clear that you were "advertizing" your product, wich I am not sure it is allowed on this forum.

I used this one: https://www.digikey.com/en/products/detail/recom-power/R-78B5-0-1-0/2256232

You forgot to mention: not free, cost 50$

Test if the Teensy can write a file by itself ? You will know if the problem comes from the SD card, the Teensy or the library.

The line 401 in main.cpp 😊

COM3 or COMM3 ???

Another possibility is some kind of EMI, radiated or conducted, wich could cause random behaviour.

Just a dumb question: Which kind of microcontroller application would require to measure period bigger than 7s, with 1.6ns resolution ?

To switch high current devices, I tend to use FET transistor. But insert a diode/resistor on the gate, to slower switching time. This will lower EMI generated during switching.

I just saw this Uses RT1170, 1Ghz, dual core, ....

On a PC, a USB port freeze due to EMI comming from the peripheral. Also when the 5V is short by the peripheral. If you are lucky, a simple application restart will restart the USB port. Less lucky, you should disconnect-reconnect the cable on this port. And unlucky, you should restart your PC. I...

Nounours, as suggested, try to play with the contrast potentiometer, even without any software running.

Should the contrast potentiometer be adjusted when changing power supply 5V<->3.3V ???

A (very) long time ago, I tryed uClinux on a Coldfire @ 66MHz, with no MMU. But I don't know if it is still maintained.

I love this thread. By reading posts, you can guess the age of the poster. I am happy to discover that I am not alone in the "experienced guys" league 😇 Angelo, 1966, Gen X club member

From what I remember, the PC file system only sees sectors from 0 to LAST. It never handle replacement sectors due to wear leveling or defective ones. It is all transparent to the PC. Same for HDD and Flash drive. The device controller handles this. When the disk becomes slower and slower, it is...

(A very) long time ago, on a Rabbit 3000 processor, I removed the FAT layer to increase write speed. No big gains, but it worked. At that time, not much RAM for buffers, no DMA, 8 bits Z80 CPU at 54MHz, .... And then, I discovered that writing a file in a directory was what caused low speeds...

This thread can now be renamed "Gunfight at the O.K. corral" :)

When you come to rant, and take advantage of competitors product reputation for your own products, don't expect warm welcome and applause.

For me, beeing Teensy-compatible means: Teensyduino and tools compatible, 600MHz or faster, at least same amount of RAM/flash, 8 serial, 2 USB, 3 SPI, 3 I2C, SPDIF, 3 CAN, and FlexIO. I would not advertize my own product "Teensy-compatible" if it could not compete with this. Maybe, it could be...

On Teensy 4.x, Serial is the USB serial port Hardware serials are Serial1, Serial2, .... Which one is used in your code ?????

Bus collisions ???? Do you mean multiple tasks have access to the I2C interface ????

And on the RX ??? Is it possible you swaped TX and RX ???

BT-module TX level at 0.04 is not correct. UART idle level is "1", 3V3 or 5V, depending on devices. What is the voltage on BT-module TX when you remove The Teensy ???

Your BT_module is powered by 5V. So, probably, its TX pin is 5V logic, dorectly connected to pin15, RX. Ouch !!!!!

Hello, I would like to replace old analog boards, full of op-amps and +-10V signals, by one Teensy. As there are multiple variants of the same design base, it would be nice to use something like Audio System Design Tool, but for an external 16bits ADC and DAC, on SPI bus. Is there something...

Hello, My collegues from electrics use these converters: Lutze 817006 programmable U/I to U/I converter. WAGO 857-500 frequency to U/I converter WAGO 857-423 And some other converters from the same familly.

On STM32, I used ChibiOs. It supports a lot of STM32 peripherals with kernel functions, and a lot of familly members. But no port for Teensy. On Teensy, I used Freertos with no problems. I used the port from tsandmann. One of the problem with interrupt routines in core libraries, they lack some...

I have problems with SD and even SIM cards on railway machines. Conditions are probably worse than on a truck, but you need only one severe bump to have data corruption.

Oups, missed that. I used the MCP23017, I2C version.

To access each MCP23S17 individually, you must have 6 separate CS signals. And acivate only one during SPI transfer

What's the pulses frequency ? Hz, kHz, MHz ??? The Teensy runs at 600MHz. If the frequency is low, you could accept the little overhead introduced by an interrupt on each pulse.

It is ok to ask for better bags for ESD protection. But be consistant. At home, who use antistatic carpet, wear antistatic shoes, antistatic bracelet connected to antistatic mat on the desk ???? ;)

At 240Mb/s, no breadboard prototype would work. Even the prototype should be done on a real pcb. There are some FPGA eval boards fitted with SDRAM. Connect the ADC on one side, and fill the SDRAM with the fast data. It will ensure you keep the exact acquisition rate. And connect the Teensy on...

Never used SD, but if I was you, I would first try to copy file1 handler in file2. Something like memcpy( file2, file1, sizeof ( put the file_handler_type here )) But i could be totally wrong :)

On the PC side I use existing old software, which connect to devices with COMx port only. I have found some port redirector software. I should write the Teensy side, which should not be that hard.

It could be a solution, but I need to modify some files to add serial endpoints. Ethernet is the prefered solution. It will open future extensions. It also provide isolation to avoid ground loops.

For a project, the Teensy is conncted to 2 devices with serial ports. But the Teensy should show the 2 physical serial ports and 2 "virtual" serial ports to a PC. On the PC, 4 standard COM port should be present, to be used by existing software. It work on the desk using tripe serial on USB, but...

Same error on U10

The link is valid, it is a Sparkfun page. Direct link is https://news.sparkfun.com/14793

Here is the news: http://sfe.io/n14793 It is not clearly stated that it is EMC compliant, and to which standard.

I would try the examples included with the library repo. No modifications. They should run fine. Then changing CPU and/or SPI speeds will validate your hardware, power supply,.... Is the ILI9341 fast enough, to support large DMA, fast refresh,...? Maybe you should check for transfer completion...

Jean, have you tried very basic sketches or examples, in order to isolate the problem: is it the hardware, the 816MHz cpu speed, SPI speed, your software, the buffer declaration or the ILI9341-t3n library.

It is correct. Don't forget Teensy is 3.3V only, and will not support 5V signal on any of its I/O pins.

Not sure how to interpret your answer. 🤔 Should I continue to try to help you ?????? Knob could be also encoders.

Is it the actual schematics ? The 100nF is not connected, Pin 5 is connected du GND

What are the "knobs" ??? Potentiometers ?

You can use a MCP23017, which is digital. But it uses I2C.