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  1. O

    Undefined reference to `_write'

    Many thanks for the very prompt reply and help! The dummy stub should/would indeed fix it. Meanwhile, through a process of removing/returning source-lines, removing line 32 viz. fadeENB[led] = random() & 1; removed the error. Changing this line to fadeENB[led] = random(2); is accepted without...
  2. O

    Undefined reference to `_write'

    Could someone please advise/help with the following build problem... The code below (.ino file, to randomly fade a small bunch of LEDs on an old Teensy LC) gives the following error when compiling or linking...
  3. O

    Slow SPI needed for old SD Card module

    Bingo! Thank you WMXZ!! Sorry my setup error! Swapped over the MOSI0 and MISO0 links to the SD card module and the original SD ReadWrite example ran responding with "Initializing SD card...initialization done." Many thanks to WMXZ and Paul and to those who kindly applied their thoughts and...
  4. O

    Slow SPI needed for old SD Card module

    I did try using the ReadWrite (Mellis/Igoe) example form the SD library reference page. Always gave "Initialization failed! ". Used "as is", viz. same I/O pins numbers (matched the LC). I haven't changed/re-set via an SPISettings() call. I need study this, will re-try and report back. The...
  5. O

    Slow SPI needed for old SD Card module

    Could someone advise/guide me on how to setup a slow SPI clock using the SPI lib on a Teensy LC for <400kBaud rates? I wish to use a 'slow' SD Card module (from 2004! :/) on a Teensy LC. (I often like trying stuff out of my old scrap collection) The spec describes: synchronous 8-bit data...
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