Serial Peripheral Interface?

George Mitchell george+freebsd at m5p.com
Wed Jan 18 00:56:47 UTC 2017


The Raspberry Pi (among others) has two IIC interfaces on the GPIO
connector, and there are /dev/iic0 and /dev/iic1 visible to userland.
It also has two SPI interfaces, but despite the presence of "device
spibus" and "device bcm2835_spi" in the RPI-B configuration file, I
have been unable to detect any userland interface to the serial
peripheral interface lines (except the dev.spibus and dev.spi sysctl
entries).  Is it possible to use the SPI interfaces somehow from
userland?                                               -- George

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