Reading .wav Data on a Micro

[skrasms]

My ultimate goal is to be able to drag and drop .wav files from my computer onto an SD card, then have a microcontroller able to read and use all the data.

This has to have been done before at least a hundred times over. Does anyone know any good places to look for example microprocessor code? I can set something up to read data straight from the SD card, but I don't know how to have a microcontroller recognize data that came from a computer.

Any help is appreciated. If other people are interested maybe we can make it a running project on here.

[yerpa58]

Here is a file written in C using the CCS compiler. It is targetted for the PIC 16F chips running at about 10 Mhz. The program is for a small stand-alone board that plays 8-bit wave files at 11 KHz. It also includes the Xmodem protocol for uploading wave files via RS-232. Not exactly hi-fi, but the newer 18F series chips quadruple the speed of the 16F series.

Good luck!

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T2k2v2.c
Description:		Download (listen)
Filename:	T2k2v2.c
Filesize:	17.76 KB
Downloaded:	470 Time(s)

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[okvern]

Hi skrasms,

You might take a look at the Wave Shield for Arduino, at:

http://www.ladyada.net/make/waveshield/

Thanks,

Ole

[jksuperstar]

You're going to need a few things:
1.) Depending on what size SD card you want to use, you'll need either FAT16 support, or FAT32 (for SDHC, or cards over 2GB). That'll be a library that reads the FAT tables off the card, so it knows what files are on the card, and where to find them. It also provides mechanisms for reading the card, with functions for file open, file close, etc.

2.) SPI or MMC/SD hardware interface code. This is low-level interface code that the FAT library will call to access the card.

3.) A WAV file reader. This should call the FAT library, to access the files, and then decode them for you for playing or editing.

Hopefully that get's you going in the right direction.