According to the datasheet H3, i2s bus pins are: GPIO 28 LRCK, GPIO 29 BCK, GPIO 37 Data
Linux is ready to use a dac i2s? modules etc.
I can not help more but that has not yet arrived my board
I am not fully sure, bacause in the code writed from Unoqueva PA18 is called MCLK and PA19 BLCK.
The Allwinner H3 datasheet show at pages 74 and 79 say
PA18 = PCM0_SYNC = I2S/PCM Sample Rate Clock/Sync
PA19 = PCM0_CLK = I2S/PCM Sample Rate Clock
PA20 = PCM0_DOUT = I2S/PCM Serial Data Output
I wrote a email to Allwinner... i wait what they will reply
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