TI中文支持网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？
，
Kailyn Chen：
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？
user6351318：
回复 Kailyn Chen:
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 0123456789abcdef00: 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 ?.%…..? ?..?Z30: 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….? ??DJ60: 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 0123456789abcdef00: 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……….
user6351318：
回复 Kailyn Chen:
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？
