SPI documentation question The first has NSS on D10.What is NSS? can they

(4 posts) (3 voices)

josheeg
Member

SPI documentation question The first has NSS on D10.What is NSS? The chip I am using will alwase be selected so could I switch the spi port the data is going to to send different data to 2 spi devices on the maple? Also can the pins be used as GPIO pins after the data is loaded into the device?

The sclk would clock data to a high speed usb module after the spi interface loads the registers.

THe slave chip issues a data ready on its drdy pin so would I test for that then run the spi function?

The Maple has two SPI ports. The first has NSS on D10, MOSI on D11, MISO on D12, and SCK on D13.

could the modes be described in a table?

Posted 5 years ago #
x893
Member

NSS = negative slave select

Posted 5 years ago #
poslathian
LeafLabs

I will look more closely at the implementation and try to build a mode table for the spi docs. Even if you are only using a single chip, you still need the chip select (NSS) line. SPI transactions are initiated via pulling NSS low, and ended via pulling it high. Even with only one chip on the bus, this toggle is essential.

Posted 5 years ago #
josheeg
Member

can I use the maple spi function to load the spi config into the registers then use the sclk line like a gpio after that to clock the data out? or is that port have to be reconfigured to act as gpio??

Posted 5 years ago #

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