Pre-Production
WM8850
ANCILLARY FUNCTIONS
The WM8850 contains a beep widget suitable for the playback of system beeps to the analogue
output widgets.
BEEP (NID = 14h)
Table 31 gives a summary of the Beep node:
NODE SUMMARY INFORMATION
NID
14h
Widget Type
Beep Generator
Supported Get Verbs
Supported Set Verbs
Unsolicited Responses
Vendor-Specific Verbs
Bh, F00h, F0Ah, F72h
3h, 70Ah, 772h
Not supported
F72h, 772h : Beep Mask Selection Verb
Table 31 Beep Node Summary Information
The Beep node controls the system beep sound created by the WM8850. The volume of the beep
signal is controlled using the Amplifier Gain/Mute Verb. The frequency of the beep signal is controlled
using the Beep Generation Verb.
The beep signal overrides any sound currently being reproduced in the output path. Under default
conditions, the beep is applied to all active outputs simultaneously. It is possible to mask the beep
generator output to appear only at specific output nodes using the vendor-specific Beep Mask
Selection Verb.
SET VERB
BIT
BITFIELD
NAME
DEFAULT
DESCRIPTION
772h
2
Port-A Beep
Mask
0h
Beep mask enable for Port-A (DAC1)
0h = Beep produced on Port-A
1h = Beep not produced on Port-A
Beep mask enable for Port-G (DAC2)
0h = Beep produced on Port-G
1
0
Port-G Beep
Mask
0h
0h
1h = Beep not produced on Port-G
Beep mask enable for Port-F (DAC3)
0h = Beep produced on Port-F
Port-F Beep
Mask
1h = Beep not produced on Port-F
AUDIO FUNCTION GROUP (NID = 01h)
Table 32 gives a summary of the Audio Function Group node:
NODE SUMMARY INFORMATION
NID
01h
Widget Type
Supported Get Verbs
Audio Function Group
F00h, F05h, F08h, F15h, F16h, F17h, F18h, F19h, F1Ah, F20h,
F71h, F86h, F8Eh
Supported Set Verbs
7FFh, 705h, 708h, 715h, 716h, 717h, 718h, 719h, 71Ah, 720h,
721h, 722h, 723h, 771h, 786h, 78Eh
Unsolicited Responses
Vendor-Specific Verbs
GPIO status change
F71h, 771h : VMID Control Verb
F86h, 786h : GPIO Automatic Control Verb
F8Eh, 78Eh : Unsolicited Response Priority Control Verb
Table 32 Audio Function Group Node Summary Information
PP, April 2011, Rev 3.2
73
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
