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Yes, the speed drives you crazy. Fortunately, the USB interface is not affected by the high bus clock rate. The question arises as to what can still be used without adjustments. Mainly because the Arduino IDE does a lot behind the scenes.

Mission accomplished. With a higher setting, I get the correct display from an 80 MHz quartz. But I would have preferred that the clock could only be set explicitly for the specific timer and that other peripherals would not be affected. Presumably other libraries etc. are no longer running...

Thanks for the reply. I added this block of code. Things get funnier @10MHz. Serial.println(CCM_CSCMR1,BIN); CCM_CSCMR1 &= ~CCM_CSCMR1_PERCLK_CLK_SEL; Serial.println(CCM_CSCMR1,BIN); CPU clock: 600.00 MHz BUS clock: 150.00 MHz 1100110000100110000000001000000...

Teensy 4.1: What is wrong here? At 10 MHz I have exactly 10 MHz on the counter. Increasing the oscillator >10 MHz leads to incorrect counting results. static inline void counter_init(void) { CCM_CCGR1 |= CCM_CCGR1_GPT(CCM_CCGR_ON) ; // enable GPT1 module GPT1_CR = 0; GPT1_SR = 0x3F; //...

Hi Paul, I don't see the lack of dynamic switching options as a defect. It would only be important to be able to operate the buses at a higher frequency in order to be able to achieve higher counting rates. Would you repeat your video https://www.youtube.com/watch?v=oAUnbqK6QCY&t=454s with the...

Is it allowed to change the divisor? Then I could do CPU=450MHz (/divisor=2) -> BUS=225 MHz? Here only the bus would be overclocked. I want to count the pulses on pin 25 with GPT1 and capture the counter reading with a 2nd capture pin.

I have an application where I would have to count around 100 MHz with GPT1. 110MHz would be even better. If I have understood the whole thing correctly, I need a bus frequency of >=220 MHz. Right?

As far as I have now understood from the code, the cpu clock and the bus clock are related by a factor of 4: F_BUS_ACTUAL * 4 = F_CPU_ACTUAL. That means, with 1008 MHz overclock I would have a 252 MHz bus clock. Should work with very good cooling?

:cool::cool:

Sorry, I missed the new SD card implementation for Teensy. https://forum.pjrc.com/threads/64136-File-abstraction-and-SdFat-integration?highlight=SD.sdfs.open

Thanks. I missed that.

Thanks Paul for explaination!

Hi! Is it possible to increase the F_BUS_ACTUAL clock in order to get higher timer clocks? https://github.com/PaulStoffregen/cores/blob/master/teensy4/clockspeed.c volatile uint32_t F_CPU_ACTUAL = 396000000; volatile uint32_t F_BUS_ACTUAL = 132000000; Another question: Why is the...

Is there an F () macro / define that disappears in Teensy so I don't have to change the code?

Hi all, SD class overload "boolean exists(const String &filepath)" is missing. String s; #if defined(TEENSYDUINO) if (!SD.exists(s.c_str())) #else if (!SD.exists(s)) #endif

The 60-70 MHz are disappointing. Also because it's the fastest MCU on the market. How does he manage to measure 132 MHz? Is the measurement reliable? https://forum.pjrc.com/threads/54711-Teensy-4-0-First-Beta-Test?p=212014&viewfull=1#post212014.

Right. For that topic there are SN65LVDS1 and SN65LVDS2.

Hello, I found this example: https://github.com/manitou48/teensy4/blob/master/gpt_count.ino https://github.com/manitou48/teensy4/blob/master/gpt2_count.ino It counts external pulses from the pin 14. Since I don't have a teensy 4.1 board, I have a question. Up to which frequency can the pin...