HSPI Clock Polarity

[0xPIT]

Hi,

how can I change the Clock Polarity for Hardware-SPI? I need the clock to be low-active instead of the default which is high-active.

I've been playing with SPI_CTRL2, but this did not work as advertised in the Register-Description Excel file.
I was unable to delay MOSI for half a cycle.

Any help? Any examples?

Thanks,

- pit

[0xPIT]

Bump
Hey Espressif, any help here please?
It's OK if it is not possible, I just need to know.

Thanks,

pit

[OverKill]

I'm trying to figure out the same thing.

I'll post back if I find anything.

[0xPIT]

Hello Espressif,

please dig out this information, can that be so hard?

Thanks again,

pit

[kolban]

Howdy there,
Have you seen this document:

download/file.php?id=577

It is:

8Q-ESP8266 HSPI Host Multi-device API v1.0

If I look on page 6, I find a parameter called "clk_polar"

This is associated with the function called hpsi_master_dev_init().

Is this what you are looking for?

Neil

[leeshine]

是啊，希望你们增加这些接口

[0xPIT]

Thanks Neil, I could find

Code: Select all

#define HSPI_FALLING_EDGE_SAMPLE()      SET_PERI_REG_MASK(SPI_USER(HSPI),  SPI_CK_OUT_EDGE)
#define HSPI_RISING_EDGE_SAMPLE()         CLEAR_PERI_REG_MASK(SPI_USER(HSPI),  SPI_CK_OUT_EDGE)


in the spi_overlap.* sources, will try soon.

Not sure if this is for slave mode, though, as it's called _SAMPLE.