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The T4 configures the GPT and PIT to clock at 24mhz, if you configure for 150mhz it will break the interval timer (PIT). here is example of GPT running at 150mhz...

thanks. did the program report the CPU clock speed (clk_sys)? 125mhz?

in the SDK there are multicore examples, pico-examples/multicore/
I don't have a pico yet, so I haven't tried any thing except some compiles.

attached is a UF2 of coremark for pico ... anyone...

Thanks! Not a lot of variation in dop values, maybe needs two decimal places. Here is data for 3 different GPS units with external antenna.

Adafruit ultimate, 1 constellation
GPS Strong...

OK, I confirmed NativeEthernet lib supports UDP BROADCAST by using local networks broadcast IP adddress, e.g. 192.168.1.255. target MAC address on packet is 0xffffffffffff


IPAddress...

Usually, for UDP broadcast you use the the broadcast IP address of your local subnet. For my home network destination UDP broadcast IP would be 192.168.1.255 (the 255 is the broadcast address for...

Another thread https://forum.pjrc.com/threads/61581-Teensy-4-1-NTP-server discusses using a PID controller and GPS to discipline T4.1 clock/time. As usual changing temperature is the dominant...

multicast is more local-network-friendly than sending broadcasts to EVERY machine on your local ethernet. Here is sketch for wiznet but you can change the includes to use NativeEthernet....

I haven't tested teensy to teensy, but I have tested T4.1 to/from linux over 100mbs wired ethernet. The linux box sends 40 1000-byte UDP packets at 97mbs and T41 receives all 40 packets at 94...

I had problems loosing GPS lock when powering up T4.1+ethernet and using an Adafruit ultimate GPS. I finally bought an external antenna and placed the antenna on windowsill. see thread ...

Maybe not. the multiple satellites are from different constellations, i think the gps solution probably uses no more than 12 satellites, though it's able to choose from a larger collection of...

Nice. Here is graphic data from T4.1 connected to sparkfun GNSS NEO-M9N with external antenna mounted on windowsill. M9N can use up to 4 constellations (GPS, GLONASS, Galileo, BEIDOU).
23409...

Earlier posts on light-sensing with LED,
https://forum.pjrc.com/threads/40001-LED-as-a-light-sensor...

here is example of "slow PWM" for Teensy4 using XBAR https://github.com/manitou48/teensy4/blob/master/qtmrxpwm.ino
discussed in...

I ran your 3 timer sketch, feeding pins with 10khz from analogWrite() on pin 8. The low order digits from the three counters seem to match


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The teensy core uses TMR1 CH0 for PWM, so it pre-configures some of the registers. You need to clear a couple more registers, try adding line in RED

...
TMR1->CH[0].CTRL = 0; ...

You could define BMP3XX_DEBUG in the Adafruit_BMP3XX library, and it should print out progress in performReading() that might help you locate the problem. Since the Teensy 4 is so fast you might...

In DCP_HASH_Update() change declaration line to read: size_t blockSize = DCP_HASH_BLOCK_SIZE;
and for test string of 64 bytes sketch returns 241003f8

(github updated)

The T4 hardware CRC is very limited, 32-bit fixed polynomial. It also has the flaw that input must be multiple of 4 bytes (it willl pad with nulls, if not), see...

FWIW, some GPSDO discussion and temperature issues in disciplining a T4 clock https://forum.pjrc.com/threads/61581-Teensy-4-1-NTP-server

As a proof of concept, here is a sketch that uses an...

yes, as referenced in post #13. I did not change NUM_LEDS in either torch.ino (240) or torchframe.ino (378)

I've run both the torchframe sketch and the torch sketch (github), with 8-LED stick on pin 11 of T3.2. I have nothing else connected (no buttons, no IR receiver, nothing on A0 and A1). The torch...

How about trying the simple FastLED bllink example, testing with various values for NUM_LEDS. Following works for me with 8-LED neopixel stick on pin 11 with 3.3v and GND from T3.2.

#include...

I have seen this problem on older sketches. I just ran your sketch on my T3.2 1.8.13/1.53 on Ubuntu 18.04 and it hangs after printing 516. If I add while(!Serial); after Serial.begin(), the...

just for the record, a while back (see old thread), I managed to get adafruit's FatFs lib to work on SPI flash on Teensy prop shield with Teensy 3.2.

http://elm-chan.org/fsw/ff/00index_e.html ...

Your sketch actually runs (not connected to anything) on a T3.2. It will also run on T4.0 (nothing connected) if you correct the fatal flaw

int flow1state = WireWrite(0, addr1, 0); // check...

Best practice warning. When setting a variable in an ISR that is referenced elsewhere, you need to declare the variable volatile so the compiler can handle asynchronous updates.
volatile unsigned...

The usual Wire protocol for Wire read is after you issue Wire.requestFrom() you then use Wire.available() before Wire.read(). maybe look at some Arduino I2C examples ....

as noted in post #4 PulsePosition lib demonstrates how to use FTM0 to capture pin input with 32-bit count.

Another example derived from Teensy LC timer 32-bit capture on pin 20:...

I've briefly played with the sparkfun M4/SAMD51 micromod processor board and the ATP carrier board. The M4 board has the SPI flash on the underside. I assume the Teensy 4 micromod board will have...

Both paths are based on the same 24MHz crystal. My original sketch in post #4 uses CLKSRC(1) to reference the 24 mhz clock. If you want to use CLKSRC(5) for 24mhz, then you must enable the 150MHZ...

yep, the example runs GPT2 @24mhz. You can configure GPT to 150MHz for CLKSRC(1) by adding
CCM_CSCMR1 &= ~CCM_CSCMR1_PERCLK_CLK_SEL; // turn off 24mhz mode
in setup() before line CCM_CCGR0 |=...

try https://github.com/manitou48/teensy4/blob/master/gpt_capture62.ino
GPT2 capture on pin 15

Thanks for adding DCache support. I added T4 v6 lines to benchmarks in post #14. Some tests are faster than v5 dcache-hack, some are slower.

Here are two proof-of-concept sketches clocking GPT timers from external clock.
https://github.com/manitou48/teensy4/blob/master/gpt_count.ino GPT1...

You might try updating to the latest IDE. On my T3.2 I ran PulsePosition lib loopback example with pin 9 jumpered to pin 10. I also added while(!Serial); as the first thing in setup(). Sketch...

For me, T4@150mhz and SPI @4mhz, my scope still sees 4 mhz on pin 13 (nothing connected to SPI pins except scope to pin 13). As KurtE noted, T4 SPI clock is independent of MCU clock.

So what does your logic analyzer report for the SPI clock rate when your beginTrasaction() sets clock to 4mhz?

if i run your SPI transfers, scope on SPI CLK (pin 13) shows 4 mhz clock for various...

OK, I ran deepsleep/button_hold_wakeup sketch on my LC. As noted in post #13 sketch did not come out of deepsleep when pin 7 was grounded. I don't pretend to understand much of the LC snooze logic,...

Re: lightweight printf

You might grab the ee_printf() from Paul's CoreMark (which works on LC)
https://github.com/PaulStoffregen/CoreMark

another ee_printf variation that works on LC from...

If you read the adafruit instructions for bno055 https://learn.adafruit.com/adafruit-bno055-absolute-orientation-sensor/pinouts
you'll see you can set the ADR pin high to change the I2C address from...

Thought I'd help beat the dead horse ... I hooked up Sparkfun BNO080 to T4.1 in SPI mode (PS0 and PS1 jumpered to 3v3) and ran the SPI EulerAngles example(17) and used pin 36 for CS. I commented...

With PJRC wiznet adapter (WIZ850io) and T3.2, I successfully ran a sketch that initialized Ether, then initialized SD and listed SD directory, then sent UDP packets to/from NTP server. Adapter was...

Make sure your USB cable is not just a "charging cable". see https://www.pjrc.com/teensy/troubleshoot.html

i had a similar problem with GPS and Teensy 4.1 with ethernet. GPS would work ok until Ethernet was activated. I had to use another GPS (NEO-8MU) with active external antenna on a long cable. GPS...

Yes, the column heading for LC says Serial1-3, so table probably reports worst case. LC Serial2 and Serial3 use F_BUS. Here's perl script for UART1 and UART2 (Serial2 and Serial3)

#!...

Your LC numbers look correct for Serial1 (UART0). You can also verify error by setting Serial1 baud rate and then examining the count in UART0_BDH and UART0_BDL.

void setup() {
...

Arduino and Teensy AVR cores implement millis() with TIMER0, study https://github.com/PaulStoffregen/ArduinoCore-avr/blob/master/cores/arduino/wiring.c

here is post on T4 TRNG from Teensy 4 beta test thread. Post also has a link to a low-level example on github. T4 TRNG is relatively slow for a hardware RNG, 13484 us for 512 bits.

@ddrown, your isr in examples/lwip_1588_input/ needs asm volatile ("dsb");, otherwise the ISR fires twice for each PPS.

https://github.com/ddrown/teensy41_ethernet