spidev access via Android image

[luke_emb_sw_dev]

Hi,

I aim to get the SPI of the UEXT connector on the A13-Olinuxino board to be usable by a Java Android application. So far I have created a native driver exposing /dev/spidev driver of the linux kernel to the Java layer. I have a test activity that opend the driver and sends a few bytes out before closing.

So my problem....

it seems that spidev driver is not available in the kernel of the Android image. i used the adb shell, started with the following command :

adb -d shell

then attempted to list all spi interfaces:

ls -al /dev/spi*

what i expected to see was something like /dev/spidev-0.0, but instead nothing. There is however three I2C devices i2c-0, i2c-1, and i2c-2.

There is also nothing in /sys/bus/devices and /sys/bus/drivers

Does anyone know how I should proceed? i am assuming I need to produce a custom Android build where the kernel includes the SPI drivers, but how I do this i am not too sure.

thanks,

Luke

[saand]

Hi Luke,
I do not know the answer to your specific question.

however to do what you want i believe would be fairly straight forward if you were running debian.

The method of creating your customized kernel and including and exluding drivers is here
https://www.olimex.com/wiki/Build_Bootable_SD_Card_with_Debian
you would need to boot with an SD card though

I have not seen much talk at all on the forums about customizing the android kernel, olimex may be the only one that can answer that one for you.

good luck

[pieter]

Hi Luke,

I am also looking for spi support in Android.

If you have a solution, please, let it know.
When I have found it, I will report back.

Currently, I am trying to (A13-OLinuXino User's Manual, Chapter 2.6):
- change the config file (A13_config_600x800.fex_ok)
   * Change in [spi2_para] spi_used in 1
- compile it to a .fexbin
- mount nanda in android
- push it to /sdcard/nanda/config.bin
- reboot android

Unfortunatly, this did not succeed.

Best regards,

Pieter

[MastaChau]

pieter and luke: have either of you gotten this to work?
pieter: did you recompile the kernel to enable SPI?  Luke may have done this.
I'm still trying to figure out how to do this...