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  • DrM's Avatar
    Today, 01:03 PM
    I did think about the Teensy4. The analog input needs to go at 250kS/s, synchronized at a certain phase relative to the first output signal which runs at 1MHz. The other two digital outputs also run in...
    19 replies | 137 view(s)
  • DrM's Avatar
    Today, 12:16 PM
    @Pilot DMA sounds interesting, it would surely be robust. Can it handle digital output on three pins simultaneously with analog input on a fourth?
    19 replies | 137 view(s)
  • DrM's Avatar
    Yesterday, 11:39 PM
    That's okay, that is certainly the idea. The small difference of course is unavoidable anyway, unless you have hardware that lets you write multiple pins in one register. Fortunately for this application it is...
    19 replies | 137 view(s)
  • DrM's Avatar
    Yesterday, 10:55 PM
    @defragster Thank you. That looks great. And yes that is the task at hand. In response to a command received through Serial,read(), I need to run three waveforms and read the adc at fixed intervals, all...
    19 replies | 137 view(s)
  • DrM's Avatar
    Yesterday, 09:01 PM
    Hmm, yes they are different timers. I understood that to mean that the all of the pins on one timer have to output the same frequency. I should perhaps try setting frequencies individually across the same group and...
    19 replies | 137 view(s)
  • DrM's Avatar
    Yesterday, 08:34 PM
    Anyway ... I've dug into the code a bit, I wanted to see how analogwrite does it, and it seems like the answer is that it does it in hardware. Experimenting with the interval timer, and the pwm, it seems that...
    19 replies | 137 view(s)
  • DrM's Avatar
    Yesterday, 08:31 PM
    "Perhaps editing kinetis.h to be just :: #include "my_kinetis.h"" I was hoping for something like a path or environment variable that I could set per project. Editing the working source tree for arduino/teensy...
    19 replies | 137 view(s)
  • DrM's Avatar
    Yesterday, 06:21 PM
    Thank you, Can a project have a private version of kinetis.h? How?
    19 replies | 137 view(s)
  • DrM's Avatar
    Yesterday, 05:47 PM
    Is there a way to reliably run a routine at 0.5 usec intervals on a Teensy 3.2? Can the IntervalTimer be configured to run at 2MHz (or faster)? How? I want to generate a set of synchronized pulsed outputs, the...
    19 replies | 137 view(s)
  • DrM's Avatar
    08-09-2020, 10:35 PM
    Hi Reim, I have your configuration and code running. But I am not quite sure how it is supposed to work. For example, the commands 't' and 'T' seem to decrement or increment t_int and then call readTCD(). But...
    21 replies | 3664 view(s)
  • DrM's Avatar
    06-30-2020, 01:41 PM
    Hi, it is a SMT design. So you have to have the actual board. I am interested to make some more if there are a few people to help dilute the assembly costs.
    30 replies | 6119 view(s)
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About DrM

Basic Information

About DrM
Biography:
Doctorate in Chemistry and Physics, former faculty in Materials Science at a big ten school, scientist in x-ray diffraction and instrumentation developer.at a National Lab. Currently working on lasing, lighting and quantum information applications in organic semiconductors.
Location:
Eastern Time, USA
Interests:
Quantum optics, acoustics, instrumentation, jazz guitar, acoustic bass, ice hockey.
Occupation:
Scientist, engineer

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Timer interrupts > 1MHz ? Today 01:03 PM
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Today 02:16 PM
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04-26-2018