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...
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 want to run it for me?
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 signals (> 25db): 10, Weak...
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 MyServer(192, 168, 1, 255);
...
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 that class C network)....
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 factor affecting the T4...
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 mbs (94.42 mbs 40...
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 strong signals.
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).
PPS To GPS: 134 ms...
Earlier posts on light-sensing with LED,
https://forum.pjrc.com/threads/40001-LED-as-a-light-sensor
https://forum.pjrc.com/threads/28407-Teensyduino-access-to-counting-cpu-cycles?p=116332&viewfull=1#post116332 LED RNG
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