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  • Bob Larkin's Avatar
    07-26-2019, 08:15 PM
    Now that I have looked, AudioOutputI2S::config_i2s(); is called from AudioInputI2S::begin() and so fixing the former fixes both input and output with the Teensy as I2S slave. Also, with the #if defined(KINETISK) of...
    36 replies | 1021 view(s)
  • Bob Larkin's Avatar
    07-26-2019, 03:26 AM
    Thanks, Frank. I just got home and tested this out. But, it did not work for me without adding a at the start of void AudioOutputI2Sslave::config_i2s(void). That seemed to be needed for both your file and the gitHub...
    36 replies | 1021 view(s)
  • Bob Larkin's Avatar
    07-22-2019, 08:43 PM
    Frank, this is all great news. I am available to test changes with T3.6 as slave (or master). I have independent directories for the old and new Teensyduino versions. This makes it easy. I will put the...
    36 replies | 1021 view(s)
  • Bob Larkin's Avatar
    07-22-2019, 03:58 PM
    Frank B., great idea. I had Teensyduino 1.44 with Arduino 1.8.7 available (well before T4) and IT RUNS. No lockup, the waveform is generated, everything is normal. I can actually proceed to evaluate the WM8731...
    36 replies | 1021 view(s)
  • Bob Larkin's Avatar
    07-22-2019, 06:13 AM
    Paul, the details of this issue have gotten spread over several posts in this thread. That makes it confusing and hard to pick up at this point, so let me try to summarize the issue , noting the post #'s above in this...
    36 replies | 1021 view(s)
  • Bob Larkin's Avatar
    07-21-2019, 06:28 PM
    The reason that I am wanting to get the 8731 running as master is the jitter on the MCLK. For instrumentation and radio applications, the noise floor and spurs is a limiting factor.The SGTL5000 has problems in this...
    36 replies | 1021 view(s)
  • Bob Larkin's Avatar
    07-20-2019, 05:04 AM
    Thanks for the ideas. It really helps to have a fresh look at these things. Pursuing your directions, I did some measurements, they did not seem to show any issue. But first, Yes, you are right. The I2C command to...
    36 replies | 1021 view(s)
  • Bob Larkin's Avatar
    07-18-2019, 04:25 AM
    I'm back with the WM8731 board in hardware. The schematic is as above and it is populated to be a master with R12 not installed, the crystal installed and nothing hooked to J5. Plugged into the T3.6 it looks like: ...
    36 replies | 1021 view(s)
  • Bob Larkin's Avatar
    07-12-2019, 10:01 PM
    Yes, yes. That is correct. My comment on pin 21 was wrong. Thanks for catching this. Good news is that the schematic and board I referenced above in this thread are correct. Bob
    4 replies | 143 view(s)
  • Bob Larkin's Avatar
    07-11-2019, 03:27 AM
    I believe that pin 21 of the WM8731 allows two I2C addresses, that should make two of them possible while sharing wires. An update on the WM8731 project I posted at the end of May...
    4 replies | 143 view(s)
  • Bob Larkin's Avatar
    06-29-2019, 08:53 PM
    SOLVED!! The update to the udev rule cured the problem. Many thanks, Paul, for getting me going again. Bob
    4 replies | 128 view(s)
  • Bob Larkin's Avatar
    06-29-2019, 06:23 PM
    Here are the tool settings
    4 replies | 128 view(s)
  • Bob Larkin's Avatar
    06-29-2019, 05:19 PM
    The serial printing works for about 5 seconds and then printing locks up. The Teensy is still running, but nothing prints, suggesting it is the at the PC end. This started out in a big program, but remains after...
    4 replies | 128 view(s)
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