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DS90UB949 HDMI audio：选用I2S Data Island transport ,948上音频无法正常输出

user6351318
Prodigy 150 points

DS90UB949 HDMI audio：

1）选用I2S Data Island transport ,948上音频无法正常输出，

示波器测量：MCLK,I2S_CLK有正常波形输出，但I2S_WC,I2S_DA没有信号输出

请问：

      要用I2S Data Island transport，能在948上音频正常输出，需要做什么配置操作?

2）但选用I2S Data Forward Channel Frame transport ,948上有音频能正常输出，且能正常听到播放的音频

但948的GPIO0,GPIO1，变成了不受控的GPIO，而输出了对应的I2S_WC,I2S_DA信号 ，导致要使用GPIO异常

请问：

选用I2S Data Forward Channel Frame transport，需要GPIO0,GPIO1为正常GPIO使用的，需要做什么配置操作？



，

  • 0
    TI__Guru**** 295050 points
    您好，I2S的信号是通过Forward channel传输的。
    您指的GPIO异常，具体指的是什么？
  • 0 回复 Kailyn Chen
    Prodigy 150 points

    你好：

    948 的GPIO0,GPIO1本是用作普通的GPIO，

    但949 的0x12配置为Forward channel时：

    GPIO0,GPIO1就变为不是普通的GPIO功能 ，而是有音频信号输出，

    GPIO0  为0.5左右电平

    GPIO1，输出波形去同i2s_wc一样

    但实际948寄存器配置的是GPIO功能 

    如949-948寄存器

    i2cdump -f -y 1 0x0c
    0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef
    00: 18 00 00 da 80 00 58 2c 2c 00 52 00 07 23 33 03 ?..??.X,,.R.?#3?
    10: 00 00 02 88 00 01 fe 1e 7f 7f 01 00 03 00 01 00 ..??.??????.?.?.
    20: 0b 00 25 00 00 00 00 00 01 20 20 a0 00 00 a5 5a ?.%.....? ?..?Z
    30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
    40: 14 55 00 00 80 00 00 00 00 00 00 00 00 00 00 00 ?U..?...........
    50: 97 a1 1e 00 28 4c 00 00 00 00 cd 20 02 06 44 4a ???.(L....? ??DJ
    60: 22 02 00 00 10 00 00 00 00 00 00 00 00 00 00 00 "?..?...........
    70: ba 00 00 00 00 00 00 ba 00 00 00 00 00 00 00 00 ?......?........
    80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
    90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
    a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
    b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
    c0: 00 00 a8 00 68 38 21 00 c0 00 00 00 00 00 ff 00 ..?.h8!.?.....?.
    d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
    e0: 00 00 a8 00 68 38 21 00 00 00 00 00 00 00 00 00 ..?.h8!.........
    f0: 5f 55 42 39 34 39 00 00 00 00 00 00 00 00 00 00 _UB949..........

    i2cdump -f -y 1 0x2c
    0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef
    00: 58 04 00 f0 fe 1e 00 18 00 00 00 00 00 00 00 00 X?.???.?........
    10: 00 00 00 00 00 00 00 00 00 01 00 00 3b 15 55 05 .........?..;?U?
    20: 00 00 42 20 08 00 83 84 11 00 00 00 00 00 00 00 ..B ?.???.......
    30: 00 00 90 25 01 00 00 8c 00 00 00 03 20 e0 23 00 ..?%?..?...? ?#.
    40: 43 03 03 00 60 88 00 00 0f 80 00 08 00 00 63 00 C??.`?..??.?..c.
    50: 03 10 00 01 80 00 00 00 00 7f 20 20 00 00 00 00 ??.??....? ....
    60: 00 00 00 00 10 00 00 00 00 00 00 00 00 00 00 00 ....?...........
    70: 00 00 00 07 07 08 00 00 00 00 00 5d 02 00 00 00 ...???.....]?...
    80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
    90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
    a0: 00 00 7d 00 00 00 00 00 00 00 00 00 00 00 00 00 ..}.............
    b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
    c0: 00 00 00 00 00 00 00 00 c0 00 00 00 00 00 00 00 ........?.......
    d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
    e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
    f0: 5f 55 42 39 34 38 00 00 00 00 00 00 00 00 00 00 _UB948..........

  • 0 回复 Kailyn Chen
    Prodigy 150 points
    Hi Kailyn Chen
    需要的是，可正常音频信号输出，且gpio0,gpio1能作普通的GPIO用，

    是否还在其它寄存器，或有什么间接寄存器之类，可配置这功能的，

    让音频信号输出，不影响gpio0,gpio1，

    要正常，需要这边怎么配置操作？