Does your MCP4725 DAC have pullup resistors on SCL and SDA?
I have an Adafruit DAC that works with T3* and T4*. The breakout has 10K pullups.
(note: your if (WriteEEPROM) ... logic is reversed but probably not...
Re: GPS PPS frequency
with Rubidium 10mhz to pin 14 and a GPS PPS to pin 15, what response do you see? Do you have a GPS with external antenna and good view of sky?
You can paste in sketch with code tags (click on #)
// Code to test Teensy 4.0 GPT2 Counter with External Clock
void setup()
{
// Setup USB serial port so we can print the timer value
...
here is small sketch to test GPT with external clock (pin 14) and and capture with pin 15
// GPT2 external clock (GPS 8 mhz) into pin 14, PPS captured to pin 15...
Dang, though the question is mute, maybe using static volatile for a and b will avoid the compiler optimizations;
static uint64_t cnt = 0;
static volatile uint64_t a, b;
void check(uint64_t x, uint64_t y) {
if...
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