i2s pll setting incorrect for 176400/2/16

philippe_44
Posts: 8
Joined: Thu May 23, 2019 3:05 pm

i2s pll setting incorrect for 176400/2/16

Postby philippe_44 » Fri Aug 09, 2019 5:38 am

Hi - Still in latest dev IDF, when using apll, the sdm0/1/2/odir choice is incorrect at least for 176400/2channels/16bits (despite a change that does a re-assessment of sdm2 after selection of odir).

The i2s_apll_calculate_fi2s() selects sdm2=7,odir=1,sdm1=sdm0=255 which is 156249 (totally off) where sdm2=5,odir=0,sdm1=2,sdm0=222 would have give precisely 176400.

This seems to be because the choice of sdm2 is the highest value possible which is not always the best/only option.

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