INTRODUCTION:
MOD-MP3-X is MP3 player module based on VS1 53 Ogg
Vorbis/MP3/AAC/-WMA/MIDI audio decoder and an IMA ADPCM and user-
loadable Ogg Vorbis encoder; supports VBR (variable bit rate) for MP3; Supports
streaming. It also employs an on-board STM32F1 3RBT6 CORTEX-M3 microcon-
troller for smart control via UEXT.
MOD-MP3-X has three modes of operation:
–Standalone mode – compatible with the old revision MOD-MP3 player. In
this mode VS1 53 controls the playback of files written on a micro SD card inserted
in the board. The user is provided with controls on volume, sound effects, starting,
stopping and sequencing of files to play.
- UEXT playback mode – in this mode the board can be connected as slave device to
host microcontroller which streams data to the codec via SPI.
- UEXT smart control mode – in this mode the on-board microcontroller manages
playback of files written to the micro SD card. The microcontroller acts as a slave
device and accepts user commands via UART. Commands include SD card direct-
ory listing, selecting of a file to play and playback and volume control.
STM32F1 3RBT6 firmware has an extra - Mass storage device, through
which you can save MP3 files to the SD card.
Note that, while the board works as mass storage device, it can not work in
UEXT smart control mode. If you want to use the board in UEXT smart control
mode, then the USB must not be plugged in and the board has to be power supplied
via external power supply (PWR_JACK or BATTERY).
MOD-MP3-X ships in two variants – with and without battery. The battery
variant employs a Li-ion 3.7 V, 12 mAh rechargeable battery and an on-board bat-
tery charger.
BOARD FEATURES:
•On-board STM32F1 3RBT6 ARM 32-bit Cortex™-M3 microcontroller
•Based on VS1 53 hardware decoder
•3.7 V Li-ion battery and battery charger (for MOD-MP3-X-BAT)
•UEXT to connect to host microcontroller (standard connector on our
ARM development boards)
•Three modes of operation
•EEPROM with firmware for standalone mode
•micro SD card holder
•USB
•Stereo Audio microphone jack, Stereo Audio headphones jack
•Can be used to record and playback
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