What's the role of CPOL in I2S?

[waclawek.jan]

Posted on September 27, 2017 at 22:10

Clocks in the I2S diagrams in STM32F4xx DS show two settings of CPOL, although the difference appears to be minor:

Also caption of several figures in I2S portion of the SPI/I2S chapter in RM0090 contain CPOL=0.

However, the text in the same I2S portion of the SPI/I2S chapter contains no mention of CPOL; and the description in the registers section is aptly titled 28.5.1  SPI control register 1 (SPI_CR1) (not used in I2S mode) and repeats ''It is not used in I 2 S mode and SPI TI mode.'' as a note at the CPOL bit description itself, too.

Comment, please.

Thanks,

Jan Waclawek

[waclawek.jan]

Posted on January 03, 2018 at 14:35

bump 2