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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...

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...

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);

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)...

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...

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...

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...

: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...

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))

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? ...

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...