topic Re: SPI Device driver programming in i.MX Processors

SPI Device driver programming

vijeshreddy — Thu, 24 Aug 2017 12:30:31 GMT

Hi ,

I have interfaced a 24bit ADC(sampling rate 52ksps) to phycore imx6 module via SPI. I have created a node in /dev - SPIDEV1.0. I have written an spi driver in user space and reading the ADC using read() function.

I am able to read the adc, but since the driver was written in user space - read() function is taking a lot of time and the samples are getting missed. I was advised to write the driver in kernel space instead of user space to resolve this issue.

I am new to linux and has no idea on device drivers.

My basic doubt is to know whether it is possible to read the ADC by writing my own device driver. Is it possible to do all buffering in kernel space and send it later to user space once all the samples are collected.

Please help me out, thanks in advance

Re: SPI Device driver programming

Carlos_Musich — Thu, 31 Aug 2017 14:30:18 GMT

Hi Vijesh,

here you can find an example of a SPI driver in user space and in kernel space http://linux-sunxi.org/SPIdev

You will find it very useful.

Regards,
Carlos

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Re: SPI Device driver programming

marcingrzelak — Mon, 23 Oct 2017 07:15:10 GMT

Hi.

i try use this code http://linux-sunxi.org/SPIdev.

And i have problem:

spi: disagrees about version of symbol spi_sync
spi: Unknown symbol spi_sync (err -22)
spi: disagrees about version of symbol spi_new_device
spi: Unknown symbol spi_new_device (err -22)
spi: disagrees about version of symbol spi_busnum_to_master
spi: Unknown symbol spi_busnum_to_master (err -22)
spi: disagrees about version of symbol spi_setup
spi: Unknown symbol spi_setup (err -22)

What is wrong?

Re: SPI Device driver programming

Carlos_Musich — Thu, 26 Oct 2017 14:12:25 GMT

check Interfacing FXLS8471Q with i.MX6Q

Regards,
Carlos