Thank you for your quick answer.
IIO drivers look like what I need to develop.
However I still have some questions:
I found this driver
https://github.com/raspberrypi/linux/blob/rpi-3.18.y/drivers/iio/adc/ti-adc128s052.c
and then tried to find the corresponding DT overlay without success.
. Is it then loaded just like a module? How does the subsystem know which
GPIO pins are used by this driver?
. Is it correct to use
line 37 "ret = spi_write(adc->spi, &adc->buffer, 2);"
to send commands to the ADC by filling adc->buffer with these commands?
Thanks,
Vladimir TOUTAIN
Promotion 2016 département IR
Grenoble INP - Esisar
----- Mail original -----
De: "Martin Sperl" <[email protected]>
À: "Vladimir Toutain" <[email protected]>
Cc: [email protected]
Envoyé: Mercredi 27 Mai 2015 15:02:36
Objet: Re: ADS1256 SPI driver for Raspberry Pi
> Any help would be much appreciated !
You would probably want to look at the drivers in drivers/iio/adc
(and the staging drivers in drivers/staging/iio/adc)
and take one as an example for your development - maybe on is even
sufficiently compatible to your ADS1256, so that you only need to
extend the compatibility list.
To activate it instead of the default spi-dev create a device-overlay
similar to this one:
https://github.com/raspberrypi/linux/blob/rpi-3.18.y/arch/arm/boot/dts/ads7846-overlay.dts
compile it and reference it in /boot/config.txt
(here some more info on the overlays:
https://www.raspberrypi.org/documentation/configuration/device-tree.md)
As for how to use those drivers from user-space here an introduction
to the iio framework (kernel and user-space):
https://archive.fosdem.org/2012/schedule/event/693/127_iio-a-new-subsystem.pdf
--
To unsubscribe from this list: send the line "unsubscribe linux-spi" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
