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  • PerM's Avatar
    06-11-2021, 05:39 AM
    Thanks Chip. I clearly did not google enough before starting to write code. I will look into the solutions you point to. Per
    6 replies | 375 view(s)
  • PerM's Avatar
    06-10-2021, 04:01 PM
    Hi MarkT, Thanks for the suggestion. That might have been simpler to implement, but now that I have a working (but clunky) solution, I am reluctant to change to another clunky solution. I would prefer to polish this...
    6 replies | 375 view(s)
  • PerM's Avatar
    06-09-2021, 12:01 PM
    I decided to make a version of AudioStream that works with float32_t instead of int16_t for use in an SDR project based on a Teensy 4. I just got it to work, but not in a very elegant way. I need it to work alongside...
    6 replies | 375 view(s)
  • PerM's Avatar
    06-06-2021, 12:11 PM
    Hi Blackaddr, Thanks for your explanations. I mostly agree with your analysis and I do not expect any drastic improvements in weak signal SNR through my changes in the I2S functions. The one point that may make it...
    6 replies | 309 view(s)
  • PerM's Avatar
    06-06-2021, 08:22 AM
    The 16-bit values (instead of 24) was due to a mistake I made in the control_WM8731.cpp. I had changed to 32-bit mode in the master enable method, while I am using it in slave mode. The corrected code in the appropriate...
    6 replies | 309 view(s)
  • PerM's Avatar
    06-06-2021, 08:03 AM
    Some more findings: It seems like the DMA is for some reason running amok and not stopping at the end of the destination buffer. I added the following printout to the ISR to check the destination address of the DM ...
    6 replies | 309 view(s)
  • PerM's Avatar
    06-06-2021, 06:27 AM
    Hi Pete, Thanks for your reply. That part of the code is taken without modification from input_i2s.cpp. I tried to add a return as you suggest (even another one for the case that allocation of new_left failed),...
    6 replies | 309 view(s)
  • PerM's Avatar
    06-05-2021, 08:33 PM
    I am trying to make a version of input_i2s.cpp for Teensy 4 that would allow me to capture all 24 bits from a WM8731 audio codec and shift the bits left by a selectable number of steps before using the resulting 16 MSBs...
    6 replies | 309 view(s)
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IRQ/ISR issues with my float version of AudioStream 06-11-2021 05:39 AM
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