SPI pin for STM32F429

[SGasp.1]

Hi community, just a single question as confirm. 

 

I am working with stm32f429.

From the schematic the hw engineer decided to use the following pin for spi purpose for communicating with an eeprom 

 

Can you confirm that i cannot use those pins for spi purpose ? 

(i have tried to select sp1,sp2,sp3,sp4,sp5,sp6)

 

Thanks a lot 

[AScha.3]

F429  - case ?

from ds , p.62:     PB13 , should be sck_eeprom - right ?  

 

-> spi2_sck is possible, so check , for other pins for your eeprom on SPI2 ;

pin74 --> LQFP144 .

+

When in Cube select/activate spi2 , then can choose also alternative pins for some peripherals ;

you can select them manually, click on the pin and choose..

 

[SGasp.1]

Hi @AScha.3 ,

 

thanks for the quick reply

case is stm32f429zit6,

 

what do you mean for spi2_sck is possible, so check , for other pins for your eeprom on SPI2 ;?

 

the point is is all the pins are ok for spi and how to change the proposed pins in cube mx 

 

Thanks

[AScha.3]

>the point is is all the pins are ok for spi and how to change the proposed pins in cube mx 

check = exactly this. Is possible ? -> ok , then click on each pin and select the function you want , spi2xxx here.

ready . Now they are "user defined" (pinned) on this position.

And set in configuration SPI2 -> full duplex master (or what you need for your eeprom access ).

[SGasp.1]

IT IS ok the only thing that it ssems that mosi and miso are inverted 

 

Thanks @AScha.3 

[AScha.3]

>mosi and miso are inverted 

signal inverted ? pins exchanged ?

 

[Andrew Neil]

@AScha.3 - "pins exchanged ?"

Look at the diagrams:

 

• PB15 is MOSI: you have that connected to "SO_EEPROM_micro" - is that correct for your system?
• PB14 is MISO:  you have that connected to "SI_EEPROM_micro" - is that correct for your system?

 

This is why names like "SI" and "SO" are best avoided: they are ambiguous - does your "SO" mean output from the MCU to the EEPROM, or output from the EEPROM to the MCU?

Using MISO and MOSI*  removes this ambiguity!

 

* or modern alternatives alternatives like PICO and POCI: https://www.sparkfun.com/spi_signal_names