nRF52840 2 SPI instance use different clock to 2 devices

[qleung]

Hello Everyone,
I am using nRF52840 and i have 2 SPI slaves (Sensor and EEPROM), the sensor spi clock is use 10 MHz and the EEPROM is 40MHz, sck、mosi、miso、ss are all different pin. Can i make 2 spi instance working in same time by setting spi_config & spi_config2?

Please let me know.
Thank you!

[awneil]

qleung said:

the sensor spi clock is use 10 MHz and the EEPROM is 40MHz

Surely, those are just the maximum specifications for those components - they don't have to be those specific frequencies?

Check the datasheets for the parts!

Give manufacturers, part numbers, and datasheet links for the slaves - so people can verify.

You can find the nRF52840 Product Specification (and other documentation) here:

https://infocenter.nordicsemi.com/topic/struct_nrf52/struct/nrf52840.html

The Block Diagram shows you that the nRF52840 has three SPIM modules:

infocenter.nordicsemi.com/.../blockdiagram.html

[qleung]

Hi Awneil
Appreciate your detail explanation, but i also want to know if don't use SPIM but use legacy SPI, it is can work in same time with different clock(like set general gpio to PWM and MOSI、MISO) too? Because those frequencies are devices specification ferquncy range.

Thanks

[qleung]

Hi Einar,

Thanks for your answer, now i know how does that work!

[awneil]

[qleung]

Hi Awneil,

Device A lowest working frequent is 40MHz and Device B maximum working frequent is 10MHz, so i need two different frequent base SPI.

[awneil]

You said the EEPROM was the 40 MHz device - EEPROMs do not generally have a minimum clock frequency.

[qleung]

Sorry i not expression that clearly, actually i need the flash memory working on at least 40 MHz, that my mistake and thanks for your help.