Cirrus-logic EP73xx Manual do Utilizador descarregar pdf (Página 127)

EP7309/11/12 User’s Manual - DS508UM4 16-3

DAI/CODEC/SSI2

1616

ldr r1, =DAISEL

str r1, [r12, #0x100] ; Select DAI in SYSCON1 0x8000.0100

ldr r1, =DAI64FS

add r11,r11,#0x1000 ; Set 0x8000.2000 base address

str r1, [r11, #0x600] ; Set DAI64FS 0x8000.2600

ldr r1, [r11, #0x200]

mov r0, #1

bic r1, r1, r0, lsl #9 ; Clear bit 9 in SYSCON3 for 64fs

str r1, [r11, #0x200] ; Set 64fs mode in SYSCON3 0x8000.2000

ldr r1, =DAIEN

str r1, [r11, #0x0] ; Enable DAI at 0x8000.2000

ldr r1, =DAISTATUS

str r1, [r11, #0x100] ; Clear Status Register

;

Operational Overview

DAI/CODEC/SSI2 MUX

The DAI, CODEC, and the SSI2 interfaces share the same set of external pins on the

EP73xx. In addition to enabling only one of these interfaces, a MUX must be

programmed to select the interface to be used with the SSI pins. Figure 16-1 on

page 16-2 illustratesthisMUX.Table 16-2 is a matrix detailing the minimum set of

configuration bits that must be programmed to properly use one of these interfaces.

(H) = High (Set)

(X) = Don’t care

To program the MUX, you will need to do the following: To connect the port to any of

the 4 features shown above, a minimum software configuration shown in the table

abovemustbeobserved.Eachregistercolumncontainsthebitname(bit#)thatmust

be cleared or set for each feature as shown in the column. This table does not

complete the programming foreach ofthe features,but allows access to the port only.

The interrupt masks for these features will have to be programmed as well.

Table 16-2: Matrix for Programming the MUX

FEATURE SYSCON2 SYSCON3 DAI64 Fs DAIR(DAI)

DAI –128Fs (X) DAISEL[3] (H) I2SF64[0] (L) DAIEN[16] (H)

128Fs[9] (H)

DAI-64Fs (X) DAISEL[3] (H) I2SF64[0] (H) DAIEN[16] (H)

128Fs[9] (L)

SSI2 SERSEL[0] (L) (X) (X) DAIEN[16] (L)

CODEC SERSEL[0] (H) (X) (X) DAIEN[16] (L)

1 2 ... 122 123 124 125 126 127 128 129 130 131 132 ... 157 158

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