Specifications

VLSI
Solution
y
VS1053b
VS1053B
11. VS1053 VERSION CHANGES
• WMA,AAC: more robust resync.
• WMA,AAC: If resync is performed, broadcast mode is automatically activated. The broadcast
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 AICTRL1
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 Chapter 8.7.2.
• Software reset clears GPIO DDR, also affects I2S pins.
• Ogg Vorbis occasionally overflows in windowing causing a small glitch to audio. Patch available.
• IMA ADPCM encoding requires short patch to start. Patch available in Chapter 9.8.1.
Version 1.01, 2008-05-22 78