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

[Einar Thorsrud]

Hi,

qleung said:

use legacy SPI, it is can work in same time with different clock(like set general gpio to PWM and MOSI、MISO) too?

The legacy SPI peripheral are also independent, so yes, you can use different clocks on the different SPI peripherals at the same time.

[awneil]

qleung said:

those frequencies are devices specification ferquncy range

Again, aren't they just the maximum limit to the range - not a requirement that they work exactly at those specific frequencies ?

[qleung]

Hi Einar,

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

[awneil]