Driver Development : SPI or 4 wire Interface on BBB

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Raul Piper

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May 23, 2016, 7:34:33 AM5/23/16
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I am developing a driver for a hardware whose datasheet says it has a 4 wire Serial interface .DataIN/OUT,Clock,CS .Does it means I can develop a full fledged SPI driver on Linux to use it.
To add more when the CLK has n-n+1(say 3-4) rising edge with LE = 1 certain control register will be written .Value of n depends on the type of control register.
Will it be good to develop a SPI driver for this or this can be achieved better by using the GPIOs(setting/resetting the CLK,Data Lines) .

experts comments required.
Rp

John Syne

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May 23, 2016, 12:29:14 PM5/23/16
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Here are the possible solutions:

1) Use spidev which allows a user space application to communicate with a device over SPI
2) Use PRU to communicate with device over SPI
3) Develop a device driver to communicate with device over SPI
4) Adapt an IIO driver that is similar to your device

Regards,
John




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Raul Piper

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May 24, 2016, 9:25:47 AM5/24/16
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My Question was Can CS be selectively made High or Low at nth or pth Clock Pulse while using/writing the SPI driver?

John Syne

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May 24, 2016, 2:13:09 PM5/24/16
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Best to use the PRU and control the I/O with software.

Regards,
John




Mark Lazarewicz

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May 24, 2016, 5:03:44 PM5/24/16
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Most SPI peripheral can control the CS automatically.  The TRM will tell you if you can meet your timing diagrams.  If it doesn’t you need to use a GPIO control of CLK in software 


On Tue, May 24, 2016 at 9:25 AM, Raul Piper

Raul Piper

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May 25, 2016, 3:33:04 AM5/25/16
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What is PRU?Can you post a link or keywords related to it.?

John Syne

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May 25, 2016, 4:15:27 AM5/25/16
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Just Google “am335x pru”


Regards,
John




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