Help with SPI in KW40Z

divyak — Mon, 12 Sep 2016 16:02:47 GMT

Hi. I am referring the FRDMKW40ZUG.pdf which is the user guide for the KW40Z chip. I need to work with the SPI but I see that the SPI is connected to the Flash memory by default on the freedom board. In the user guide in section 4.2.4.1 Serial flash memory (SPI interface), I find this line - "You can share the SPI with other peripherals using the J2 SPI connectors. The normal SPI_SS and the second chip-select must not be active at the same time."

Which is the second chip select? Is it SPI0_PCS1?

My main question is how do I use the SPI in the FRDM KW40Z board?

Re: Help with SPI in KW40Z

jorge_a_vazquez — Wed, 14 Sep 2016 04:35:14 GMT

Hi Divya K

Yes, as you mentioned SPI in FRDM-KW40Z is default connected to Flash memory, you can refer to the FRDM schematic, you will find:

Where:

As you can see, SPI flash memory is connected to SPI0 (SPI0_PCS0). If you want to use SPI0 in frdm you can use another PCS, like SPI0_PCS1 that is connected to PTA0 (J2 pin 2) or SPI0_PCS2 in PTC7 (J1 pin 4). You just have to consider, as it said in user manual, that SPI0_PCS0 and second PCS should not be active at the same time.

Hope this information helps, attached you can find the frdm schematic, please tell me if you have any question related.
Have a great day,
Jorge Alcala

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Help with SPI in KW40Z

Re: Help with SPI in KW40Z