Cirrus Logic AN298 - Manual (Page 19)

AN298RC14 19
5 Audio Manager Firmware Module
5 Audio Manager Firmware Module
5.1 Overview
The Audio Manager Firmware module provides the ability for the microcontroller to easily manage general audio controls
such as gain, mute, trim and channel remap.
5.2 Audio Manager
Index = 0xHHHH, data value = 0xhhhhhhhh
Write = 0x8300HHHH 0xhhhhhhhh
Read Request = 0x83c0HHHH
Read Response = 0x03c0HHHH 0xhhhhhhhh
Table 5-1. Audio Manager
Index Variable Description
0x0000 GAIN † 0x00000000–0x7FFFFFFF (-inf. to +24 dB). Overall System Gain. Signed value with decimal
point to the right of bit 27. Range is zero to (16-2
-27 ). Negative values can be used to invert the
phase of all the outputs.
Default = 0x08000000 (+0 dB)
0x0001 MUTE † 0/1 = Unmute/Mute Audio
Default = 0x00000000 (unmuted)
0x0002 CHAN_0_TRIM † 0x00000000–0x80000000 (0.0 to 1.0)
Volume trim for channel 0 (Left Channel)
Default = 0x80000000
0x0003 CHAN_1_TRIM † 0x00000000–0x80000000 (0.0 to 1.0)
Volume trim for channel 1 (Center Channel)
Default = 0x80000000
0x0004 CHAN_2_TRIM † 0x00000000–0x80000000 (0.0 to 1.0)
Volume trim for channel 2 (Right Channel)
Default = 0x80000000
0x0005 CHAN_3_TRIM † 0x00000000–0x80000000 (0.0 to 1.0)
Volume trim for channel 3 (Left Surround Channel)
Default = 0x80000000
0x0006 CHAN_4_TRIM † 0x00000000–0x80000000 (0.0 to 1.0)
Volume trim for channel 4 (Right Surround Channel)
Default = 0x80000000
0x0007 CHAN_5_TRIM † 0x00000000–0x80000000 (0.0 to 1.0)
Volume trim for channel 5 (Left Surround Back Channel)
Default = 0x80000000
0x0008 CHAN_6_TRIM † 0x00000000–0x80000000 (0.0 to 1.0)
Volume trim for channel 6 (Right Surround Back Channel)
Default = 0x80000000
0x0009 CHAN_7_TRIM † 0x00000000–0x80000000 (0.0 to 1.0)
Volume trim for channel 7 (LFE0 Channel)
Default = 0x80000000
0x000A Reserved Reserved
0x000B Reserved Reserved
0x000C Reserved Reserved