30 lines
1.5 KiB
Markdown
30 lines
1.5 KiB
Markdown
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## Linux cifX plugin interface
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The libcifx plugins allow an interface independant access to netX devices. It is based on the cifX toolkit HW function interface.
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Currently a SPI sample interface is provided, which is able to work with Linux SPI devices.
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The easiest way is to build the driver with SPI plugin support enabled (manual way -> build option: SPM_PLUGIN).
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The driver's installation process will automatically create a plugin directory in the driver's configuration path (default: "/opt/cifx/plugins").
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After the installation adapt the SPI plugin configuration (/opt/cifx/plugins/netx-spm/config0) according to your needs and run the application to access a SPI device.
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| parameter | |
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| -------------- |:-------------:|
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| Device | Name of the SPI device to open (e.g. /dev/spidev0.0 -> Device=spidev0.0)
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| Speed | Maximum speed to configure the driver (e.g. 25Mhz -> Speed=25000000)
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| Mode | SPI mode 0 to 3
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| ChunkSize | Chunk size (maximum size of transfer after which a new transfer will be automatically setup in bytes). If set to 0, no transfer splitting will be executed. e.g. Split transfers in case it is larger than 250 byte => ChunkSize=250
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| Irq | Path to irq file, e.g. /sys/class/gpio/gpio1/value
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## IRQ configuration
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If using GPIO-based IRQ, only edge may be available while the netX works level oriented.
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Therefore, the driver internal compensates this but requires the following GPIO settings:
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```
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direction=in
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edge=rising
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active_low=1
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```
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