Datasheet

VS1053b Datasheet

12 VERSION CHANGES

• Read and write to YRAM at 0xe000..0xffff added to SCI_WRAMADDR/SCI_WRAM.

• The resync parameter (parametric_x.resync) is set to 32767 after reset to allow iniﬁnite

resynchronization attempts (or until SM_CANCEL is set). Old operation can be restored

by writing 0 to resync after reset.

• WMA,AAC: more robust resync.

• WMA,AAC: If resync is performed, broadcast mode is automatically activated. The broad-

cast mode disables ﬁle size checking, and decoding continues until SM_CANCEL is set

or reset is performed.

• Treble control ﬁxed (volume change could cause bad artefacts).

• MPEG Layer I mono ﬁxed.

• MPEG Layer II half-rate decoding ﬁxed (frame size was calculated wrong).

• MPEG Layer II accuracy problem ﬁxed, invalid grouped values set to 0.

• WAV parser now skips unknown RIFF chunks.

• IMA ADPCM: Maximum blocksize is now 4096 bytes (4088 samples stereo, 8184 mono).

Thus, now also plays 44100Hz stereo.

• Rt-midi: starts if in reset GPIO0=’0’, GPIO1=’1’, GPIO2&3 give earSpeaker setup.

• NewSinTest() and NewSinSweep() added (AIADDR = 0x4020/0x4022) AICTRL0 and AIC-

TRL1 set sin frequency for left/right.

• Clears memory before SPI boot and not in InitHardware().

Known quirks, bugs, or features in VS1053b:

• Setting volume clears SS_REFERENCE_SEL and SS_AD_CLOCK bits. See Chap-

ter 9.6.2.

• Software reset clears GPIO_DDR, also affects I2S pins.

• Ogg Vorbis occasionally overﬂows in windowing causing a small glitch to audio. Patch

available (VS1053b Patches w/ FLAC Decoder plugin at

http://www.vlsi.ﬁ/en/support/software/vs10xxplugins.html).

• IMA ADPCM encoding requires short patch to start. Patch available in Chapter 10.8.1.

• There are also ﬁxes for some other issues, we recommend you use the latest version of

the

VS1053b Patches w/ FLAC Decoder package from

http://www.vlsi.ﬁ/en/support/software/vs10xxplugins.html.

Version: 1.22, 2014-12-19 87