Waveshare Music Shield, Руководство пользователя

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Music Shield User Manual
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Revision 1.1. Date: December 7, 2015. Author: W. L. Yan. Editor: Felix.
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0x4 rw 0 100 CLKI DECODE_TIME Decode time in seconds
0x5 rw 0 450 CLKI AUDATA Misc. audio data
0x6 rw 0 100 CLKI WRAM RAM write/read
0x7 rw 0 80 CLKI WRAMADDR Base address for RAM write/read
0x8 r 0 80 CLKI HDAT0 Stream header data 0
0x9 r 0 210 CLKI HDAT1 Stream header data 1
0xA rw 0 80 CLKI AIADDR Start address of application
0xB rw 0 80 CLKI VOL Volume control
0xC rw 0 80 CLKI AICTRL0 Application control register 0
0xD rw 0 80 CLKI AICTRL1 Application control register 1
0xE rw 0 80 CLKI AICTRL2 Application control register 2
0xF rw 0 80 CLKI AICTRL3 Application control register 3
Here are brief introductions about the main registers. (Please see the section SCI Registers of
VS1053b datasheet for more details)
SCI_MODE Register: it is used to control the operation of VS1053b.
Bit Name Function Value Description
0 SM_DIFF Differential 0
1
normal in-phase audio
left channel inverted
1 SM_LAYER12 Allow MPEG layers I & II 0
1
no
yes
2 SM_RESET Soft reset 0
1
no reset
reset
3 SM_CANCEL Cancel decoding current file 0
1
no
yes
4 SM_EARSPEAKER EarSpeaker low setting 0
1
off
active
5 SM_TESTS Allow SDI tests 0
1
not allowed
allowed
6 SM_STREAM Stream mode 0
1
no
yes
7 SM_EARSPEAKER EarSpeaker high setting 0
1
off
active
8 SM_DACT DCLK active edge 0
1
rising
falling
9 SM_SDIORD SDI bit order 0
1
MSb first
MSb last