Spi full duplex problem

[juan_rodri]

Hello,
Im working with stm8s003 and W5500. Im having problems with incoming data from W5500.

Pinout
Stm8 w5500
Miso---------miso
Mosi---------mosi
Clk------------clk
Cs-------------cs

Spi config
Fullduplex
Msbfirst
8mhz
Cpol=1
Cpha=1

With logic analizer i can see that mosi and miso are working, but i always sample 0xFF(if miso is pullup) and 0x00(if miso is pulldown) inside stm8 data register.
I have tried miso as floating also.
I have tried polling and interrupt spi.
I dont know if im doing something wrong.
Can W5500 works at 8mhz ? Must it works in full duplex mode?
Anyone has any tip?

Thanks in advance

[Eugeny]

@juan_rodri

Can W5500 works at 8mhz ?

Datasheet says 33.3 MHz.

@juan_rodri

Must it works in full duplex mode?

Refer to the chapter 2.3 of the datasheet, it comprehensively shows what is going on the SPI bus. When master sends first 3 bytes for the command, W5500 responds with bytes 1, 2, and 3 - therefore it is full duplex, but “data” transferred during this phase is always the same and used for diagnostic purposes to identify if W5500 confirms reception of the command bytes.

@juan_rodri

i always sample 0xFF(if miso is pullup) and 0x00(if miso is pulldown) inside stm8 data register

Suggests you sample at the wrong time.