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erosqnative: Updated documentation about an odd quirk of hw3/hw4 platforms

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The ES9018K2M DAC used on hw3/hw4 defaults to 32-bit audio frames but
when configuring it to match the SoC I2S settings (ie 16 or 24-bit)
it results in garbled output for unexplained reasons.

Change-Id: If3074f38178b19520ca6222a1e020ea210069a6d
This commit is contained in:
Solomon Peachy 2026-08-14 22:42:07 -04:00
parent df85814e74
commit 9a80f5af55
1 changed files with 5 additions and 4 deletions
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9
firmware/target/mips/ingenic_x1000/erosqnative/audiohw-erosqnative.c
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@ -105,10 +105,11 @@ void audiohw_init(void)
es9018k2m_present_flag = true;
builtin_pcm_sink.caps.volume_type = PCM_SINK_HWVOL;
/* Default is 32-bit data, and it works ok. Enabling the following
* causes issue. Which is weird, I definitely thought AIC was configured
* for 16-bit data... */
// es9018k2m_write_reg(ES9018K2M_REG1_INPUT_CONFIG, 0b00001100); // 16-bit data
/* ES9018K2M defaults to 32-bit sample depth, which appears to work
properly with both 16-bit and 24-bit AIC configuration! Enabling
the following (ie to match the actual AIC configuration) produces
garbled output!
// es9018k2m_write_reg(ES9018K2M_REG1_INPUT_CONFIG, 0b00001100); // 16-bit data
/* Datasheet: Sets the number os FSR edges that must occur before *
* the DPLL and ASRC can lock on to the the incoming Signal. *