063a3154aa
This commits uses CLK_* and so requires libftdi 1.2.1.4+ Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com> Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
25 lines
1.1 KiB
Markdown
25 lines
1.1 KiB
Markdown
FTDI FT4222H {#ft4222}
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============
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The FT4222H is a High/Full Speed USB2.0-to-Quad SPI/I2C device controller. Mraa
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supports it as a USB subplatform using the libft4222 library from FTDI which
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can be found
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[here](http://www.ftdichip.com/Support/SoftwareExamples/libft4222-1.2.1.4.tgz).
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You need the latest version for the GPIO to work
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The FT 4222H has 4 configuration modes selected by {DCNF1, DCNF0}. The c hip
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configuration mode will determine the number of USB interface s for data stream
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s and for GPIOs control. Mraa supports only chip CNFMODE0.
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Whilst mraa can support custom board in CNFMODE0 (support for other mode is
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welcome!) there may be some work to be done. We test using FTDI's UNFT4222EV
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reference board. More detail on this board can be found
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[here](http://www.ftdichip.com/Support/Documents/DataSheets/Modules/DS_UMFT4222EV.pdf).
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Interface notes
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---------------
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You will need to unload all ftdi kernel modules for libft4222 to work
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correctly. You will also have to compile mraa with FT4222 support which may not
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be enabled by default.
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