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Sounds potentially like one of the standard things: Look in your code, typically in setup that looks like: while (!Serial) {} or while (!Serial) ; That says wait forever until USB Serial is ready... If I want...

A couple of additional points, that might help. As mentioned, there are 8 hardware UARTS (LPUART) objects, but the number of the hardware UART does not necessarily correspond to the Serial object number. That is...

I've added a link to this thread on the T4 bootloader page, in the footnotes under the BGA pinout diagram. Doesn't help you now, but hopefully will help others avoid this SD_B1_05 issue on their future PCBs.

Perhaps somebody else has come up with other eyes. I didn't see any other things referring to Uncanny Eyes over at the Adafruit Learning pages, but maybe do a query over at the Adafurit forum. There are 4 main strains...

Thanks once again for taking the time to reply, I just don't want to waste time reinventing the wheel when the work is already done and out there!

Thanks! Yup, the DX7 is fine being controlled by other gear, a KX88, the reface, a Clavinova, my computer running MidiOX or a DAW etc. I mean i say "fine" with the usual caveats around this board! :) I also tried...

Does the DX7 respond to MIDI from another piece of equipment? Can you control it using the Reface CP? I'm wondering if your MIDI out circuit needs a buffer, usually two hex inverters in series. Your MIDI Thru box...

Super Thx!!

You could look at HardwareSerial.cpp. https://github.com/PaulStoffregen/cores/blob/master/teensy4/HardwareSerial.cpp Normally you wouldn't use these interrupt directly. You just use the Serial1 to Serial8...

Do you have arduino ide and TeensyDuino installed? Do you have a Teensy?

I appear to have narrowed it down to nothing whatsoever to do with the MIDI library! Even with the simple "blink" example running on the Teensy, the DX7 barfs as soon as power is provided to the Teensy If i...

Oh thanks for letting me know! So what should I use for a USART receive interrupt? I'm a little confused on the documentation of the interrupts. Is there some place I can see an example code for the teensy? Especially...

I have not had chance to try it yet. Will wait to see what you find out...

No, that name is for Arduino, not for Teensy.

The picture is on the teensy website here So would the ISR() name be USARTx_RX_vect for Serialx?

That table looks like it's for an AVR-based Arduino. For Teensy 4.1, yes, there are separate TX and RX interrupts for each serial 1-8.

Those are the only patterns I have. They came with the original Uncanny Eyes source at Adafruit. The Uncanny Eyes page at the Adafruit Learning guides has a page about doing custom eyes: ...

So that idea (trimming the circuit) does not completely work... there's a little bit of bleed between the channels and the intensity alone isn't as bright as it should be. But it also made me double-check the resistance...

Hi,fellows i had the same issue,so i took my ohm-meter to find the pinout of the sd card of the audio board for my teeny3.2 and these are the winning numbers: NC / NC DAT3 / CS-> 10 CMD / MOSI->11 GND /...

Where’s the picture from? A picture can say anything.

Its just a linearly interpolated lookup table. -1 to +1 is the full range of the audio signal. Every sample in therefore mapped to the output via the mapping.

Bourns MF-FSMF050X-2 https://www.digikey.com/en/products/detail/bourns-inc/MF-FSMF050X-2/2039256 Of course it's actually a PTC resistor, not a real fuse which permanently blows to stop all current flow. During an...

@MichaelMeissner do you have any links to Uncanny Eyes 128x128 data files by any chance? I have the following already but guess there are many more somewhere: catEye.h defaultEye.h doeEye.h dragonEye.h...

If you look at file in FreqMeasureMultiIMXRT.cpp in the src folder of the library, you will see a table that defines all of the pins available for use by the library. Here's a quick summary: For both T4.0 and T4.x,...

I once had to cut large 4-layer boards down in size and found that a bandsaw with a fine tooth blade did a good job. Main issue that came up was that the internal power/gnd planes would occasionally short due to...

It's the same as usual (DMA memory access is basically the same as the CPU since there's no MMU) except with those memory regions you'd need cache management - flush any source memory from the CPU's cache before the...

Thanks very much to all for the input. I will probably go with chopping off the T4.1's bottom. The problem with external storage is access time (rather than max transfer speed). I am sure one could do some clever...

The T_4.0 also has USB_HOST pins/ability. If storage space is needed and speed provided can be acceptable, and a SMALL enough USB Flash drive could be connected that would give much larger storage space. There is a...

In terms of the FETs, yes, both of those should be good. In fact both should be OK for either use, the second one is a little better but either would do. If your LEDs are 3.3V and 20mA and your power supply is 5V then...

After some glacial development I'm now moving ahead with the production of a PCB.

That doesn't seem like the logical way to do what is desired; rather it sounds like you should be transmitting the mouse data in a separate timed loop if that's what the FPGA requires.

Assuming that you have used a Teensy LC or later, try reducing the value of the 47R resistors to 33R or 27R.

Maybe use a T4.0 and connect the underside pins between Pin 2 and Pin 23 to the SD?

I think you can add quite a large buffer, assuming you have RAM space available. I think this is a good improvement and you will see some benefit. How did you choose 12 minutes per file, which is 120 per day? It...

a short update, I got rid of the more 'elaborate' routines and loaded up this simple test Note On, Note Off program instead, with the exact same results: works fine on Reface CP - playing the notes works fine via a...

Thank you so much for testing this. I increased the serial buffer to 16 * 1024 and tested for about an hour. Just like you had mentioned, I haven't noticed any issues so far. I will also be looking to add more sensors...

Opps - wrong direction based on p#1 snippet - assumed it was in global scope - wondered but ignored p#3 note Paul picked up on

The PCB and components are unchanged. The LOCKED Teensy will ship with the white image of a 'LOCK' stamped on the MCU: image from pjrc.com/store/teensy40.html#codesecurity

Unless it's declared static, variables within functions get allocated in the top of RAM1. You can see on the chart "Local Variables" with an arrow pointing downward. As each function runs, more of that memory is...

Before answering, I want to mention the memory chart from the Teensy 4.1 page.

Based on the link the allocation is always dynamic as p#1 shows. The link shows making an explicit memory allocation and passing the pointer to the library. Otherwise it seems the reserved space is just a pair of...

I see your point. We define that variable in the main() function, does it count as dynamic allocation? What will happen if we define them in the global scope?

guessing the Matrix is dynamically allocated? Quick search suggests that is the case and you can make and provide 'local' memory as indicated in the reply a couple down from the top here:...

The polling that causes the host to transmit IN tokens happens entirely in the EHCI hardware, so there is no "easy" way. The hardware does have an option to interrupt on NAK, but I've never tried it. If you want to...

If you can go slightly wider, you might look at the Teensy micromod, which is a Teensy 4.1 with M.2 hookup instead of using through hole pins that Sparcfun sells. Now, at first glance, the carrier boards that they have...

I can confirm all the stuff beyond the 5 through-hole pin is non-essential for Teensy 4.1 to run. You'll just lose 18 I/O pins, SD socket, and PSRAM pads. How to "safely" cut the PCB is a good question. It is a 6...

Thanks. I should have consulted the data sheet first. All is fine now. Kris

Thanks for the advice. Much appreciated!

Hi all, There are a lot of RS485 modbus programs but the code below works out of the box and is fully tested on a T4.0, T4.1 and ESP32C3 for the ESP32C3 you need only change the Serial5 to Serial0. Look at the...

Nice vowel sounds from Jeannie :o

Twos complement is just the typical number format used by machines. From the MPU6050 register map and descriptions datasheet: -2857 / 340 + 36.53 = 28.127 degrees celsius = 82.63 degrees F. My reply was...

That actually looks correct to me. Look at the register map and the formula is: Temperature in degrees C = (TEMP_OUT Register Value as a signed quantity)/340 + 36.53 For your example, I get 28 C, about 83 F....

You might find these helpful: - Help with waveshaper effect - Adding harmonic distortion with Arduino Teensy - TeensyDist

1mV has got to be lower than whatever the threshold is on the reset pin. Additionally, the issue also happens somewhat intermittently with the battery removed; in this case, however, pressing the button to resume the...

Thanks @KurtE and @PaulStoffregen, this compiles and runs and an initial test looks like comms are performing as expected. I will do a little deeper testing in the next day or two, but so far all looks good.

Your changes: PROGMEM constexpr TwoWire::I2C_Hardware_t TwoWire::i2c2_hardware = { CCM_CCGR2, CCM_CCGR2_LPI2C2(CCM_CCGR_ON), {{41, 2 | 0x10, &IOMUXC_LPI2C2_SDA_SELECT_INPUT, 1}, {0xff, 0xff, nullptr, 0}},...

I have attached the WireIMXRT.h and WireIMXRT.cpp files. The suggested edited portions are listed below... From WireIMXRT.h //#if defined(ARDUINO_TEENSY_MICROMOD) extern TwoWire Wire3; //#endif From...

Not sure of the answer to the question - cool that it works except the feedback part. Edited p#1 to include the ... tags using the # on toolbar. That retains code formatting/indentation for readability. If...

And the experts at NXP recommend to leave it floating... just my luck. Yep, I'll have to print a new batch of PCB, I'll be more careful

I did some testing. Turns out that the DQS is daisy chained through that pin. If I change the registry of AD_B1_09 instead, I can use the pin normally. IOMUXC_FLEXSPIA_DQS_SELECT_INPUT = 0b1;...

Sounds like you're really close. At this point, probably best to share your modified WireIMXRT.h and WireIMXRT.cpp so I can others like Kurt can take a look. If using forum's Quick Reply, click Go Advanced to get...

Has worked when tried here since Beta 4.0 and 4.1. The button to GND must not be going low enough? 1 mV doesn't seem like much - but something is keeping it from seeing the needed 'drop' to GND it seems. In that...

Thanks, very much, for the quick response! I'll look at this and try it out! Dave

F This must be added in WireIMXRT.cpp to get the I2C clock on 2 MHz } else if (frequency < 1000000) { // 400 kHz port->MCCR0 = LPI2C_MCCR0_CLKHI(26) | LPI2C_MCCR0_CLKLO(28) | LPI2C_MCCR0_DATAVD(12)...

Hi Dave, This is what I used for my power and SWR meter and changed it a bit for you..... Hope it is usefull. Best, Johan #include<Wire.h>

Hi - Sorry it's been a few years since I've played with my Teensy 4.0 stuff. I have a new project that uses an AD7991 4-channel ADC for analog input. Is there some example code for this, including which libraries...

Looking at the color lines of the circuit with fresh eyes, I think it could be simplified to get rid of four resistors? /* * INTENSITY (13) <-- 536R --\ * | * GROUND <------ 536R...

Yeah - VGA last seen was the C64 emulator on T_3.6

Thanks and no it was not. I bread boarded the R2R ladder and VGA connector. I don't think I know about FrankB's board. The schematic is shown above and in the VGA_4bit_T4.ccp file at the beginning of the file. Most of...