Arduino Wave Player PWM - Super Lite - Nim

---

• Description

  • This project is very simple wave player program with SD card using Nim language and using only passive parts, capacitor,diode and resistor except SC card.

• Prerequisite

  • nim-1.6.0
    • Important: It must be used above nim version otherwise it won't work well.
  • avr-gcc v7.3.0 (inclued in arduino-1.8.16 IDE)
    • For example, if on Windows10 set executable path to
      d:\arduino-1.8.16\hardware\tools\avr\bin
  • make,rm and etc Linux tool commands

• Target Boards

  • Arduino Uno / Nano

• Schematic and Photo

  Schematic
  Photo
  Output filter

• Build project

  • You can use make command for build management as follows,

    $ make # build target
    $ make clean # clean target
    $ make w # upload to flash

    or

    $ nim make # build target
    $ nim clean # clean target
    $ nim w # upload to flash

  • Artifacts (*.hex,*.lst files etc) would be generate to .BUILD folder.

• Supported SD card

  • SDSC/SDHC card FAT16 and FAT32
    1. First, format SD card using SD Card Formatter
    2. Copy PCM wav files to root directory of the SD card.

• Supported file

  PCM wave files that have file extension ".wav" on root directory.
  PCM:16bit/8bit, fs(sampling rate)=32kHz,44.1kHz,48kHz.
  Stereo/Mono.

• Hardware setting

  • Refer to the file ./port_setting.txt
  • PWM output port:

    Audio Left     PWM out : OC1A: PB1, 15pin, D9
    Audio Right    PWM out : OC1B: PB2, 16pin, D10
    

• User button (S1)

  • D2 (PD2) Button SW
    • Next song : One click during Play mode.
    • Play Pause: Push long time .
    • Play : One click from Pause state.

• Control from UART

  • Set baudrate: 38400bps
    • Next song: Send from key board 'n' or ' '(Space) during Play or Pause mode.
    • Play/Pause: Send from key board 's' or 'p' or 'ESC'(Escape char) during Play or Pause mode.
      Play or Pause mode would be toggled.

• Display music filename during play mode by UART output.

  • This is debug purpose so only display 8.3 type filename (ansi).
    • UART output

      OURPLACE.WAV   # Power on. Start playing music.
      RAINBOWS.WAV
      ACOUST~1.WAV
      ARTP7   .WAV
      HOTELC  .WAV
      OURPLACE.WAV   # Repeat form first file. 
      RAINBOWS.WAV
      ...
      

• Schematic

  • Arduino Nano
    • External 3.3V power is required so that the current consumption of SD card might exceed instantaneously over 100mA when power becomes on.
      • 

• Photo

  • Arduino Nano compatible board
  

• Output filter

  

Other links2

• Wave player project Super lite series
  • Nim language
    • Arduino Wave Player PWM Super Lite Nim / Nim Completed.
    • STM32 Wave Player PWM Super Lite Nim / STM32(F0,L1,F3,F4) Nim Completed.
  • C++ language
    • Wave Player Super Lite / STM32(F0,L1,F4) / Mbed2 / C++ Completed.
  • Jal language
    • Pwm Wave Player Jalv2 / PIC16F1xxx / Jal