The following page is a detailed list of all of the available settings for the rMP3. Please see the Settings Command for more details on changing settings.

Setting name: D

The rMP3 communicates using asynchronous serial.

Example: Set serial bitrate to 115200 bps

Setting name: P

This is the character that is returned when the rMP3 is ready to receive a new command. You can use this character to synchronize communications.

Range: 1 → 254

Type: ASCII character value.

Example: Set prompt to ']'

Setting name: R

This is a delay that is introduced between when a command is received by the rMP3 and when the command begins processing. This is especially useful for controllers that need time to set up their serial input (e.g. Basic Stamp).

Range: 0 → 254

Type: Time in 10 millisecond increments (e.g. 5 = 50 ms).

Example: Set response delay to 50 ms

Setting name: V

Sets the start-up volume for the rMP3. You can provide both the left and right volume settings.

Range: Left: 0 → 254, Right: 0 → 254

Type: Volume attenuation in -0.5 dB increments (e.g. 16 = -8 dB).

Example: Set volume to L:0 dB, R: -4 dB

Setting name: O

Sets the default loop count for playback. This is the number of times a file is repeated.

Range: 0 → 254

Type: Number of repeats.

Note: 0 means infinite repeat - continuous looping of playback. A value of 1 means to play the file once.

Example: Set default loop count to 2

Setting name: B

Sets the default Boost value. This is an audio enhancement provided by the decoder which boosts the bass and/or treble response.

• Treble boost can be set from -12 to +10.5 dB boost (in 1.5 dB steps) at and above frequencies ranging from 1000 to 15000 Hz (in 1000 Hz steps).
• Bass boost can be set from 0 to 15 dB boost (in 1 dB steps) below frequencies ranging from 20 to 150 Hz (in 10 Hz steps).

The Boost value is calculated as follows:

• treble boost = (treble amplitude[see table below] * 16) + treble frequency/1000
• bass boost = ((bass amplitude * 16) + (bass frequency/10)
• boost = treble boost * 256 + bass boost

A value of 0 will turn off the audio enhancement.

Range: 0 → 65536

Note: Treble amplitude is a twos-complement value for the amplitude.

Type: Boost encoded value.

Example:

Treble boost frequency: 10 kHz (and above)
Treble boost amplitude: +10.5 dB
Bass boost frequency: 60 Hz (and below)
Bass boost amplitude: +15 dB

treble boost = (7 * 16) + 10000/1000
             = 112 + 10 = 122
bass boost   = (15 * 16) + 60/10
             = 240 + 6 = 246
Boost value  = 122 * 256 + 246
             = 31478

These are the very same settings for the file system as found on the uMMC.

Setting name: S

Sets the input interface style. See the Input Interface section for more information.

Example: Set input style to 7 Bit plus Trigger (2)

Setting name: H

Sets the “D” pin to be a hardware busy logic output (high = playing).

Range: 0 or 1

Type: Switch.

Example: Turn on Hardware Busy Indicator

Setting name: N

Sets the offset for the filenames used for the input interface. For example, if the Button/Switch interface is being used, and the Input File Number Offset is set to 200, then all filenames will be offset by 200. i.e. The filename for Button/Switch 2 will be B0202.MP3.

Range: 0 → 9872

Type: Offset.

Example: Set offset to 100

Setting name: U

In 8 Button/Switch mode, this 8 bit mask indicates which buttons will be considered non-stop (a 1 in the mask indicates non-stop). In 7 Bit mode, anything > 0 will indicate non-stop playback.

Range: 0 → 255

Type: 8 bit mask.

Example:

Set input pins 0 and 5 as non-stop (“uninterruptible”):

Setting name: A

Used only in 8 Button/Switch mode, this 8 bit mask indicates the polarity of input for each individual input pin (a 1 in the mask indicates positive edge triggering).

Range: 0 → 255

Type: 8 bit mask.

Example:

Set input pins 0 and 6 as positive edge triggered (the rest are negative edge triggered):

Setting name: M

Used only in 8 Button/Switch mode, this setting will turn on a simple 40 ms debounce algorithm for the inputs.

Range: 0 or 1

Type: Switch.

Example: Turn on debounce algorithm