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resources:tools-software:linux-drivers:iio-dac:ad5593r [22 Feb 2016 17:52] – [Device tree example] Michael Hennerichresources:tools-software:linux-drivers:iio-dac:ad5593r [23 Feb 2016 13:37] – [Description] Michael Hennerich
Line 26: Line 26:
  
 The AD5593R have an integrated 2.5 V, 25 ppm/°C reference, which is turned off by default, and an integrated temperature indicator, which gives an indication of the die temperature. The temperature value is read back as part of an ADC read sequence. The AD5593R have an integrated 2.5 V, 25 ppm/°C reference, which is turned off by default, and an integrated temperature indicator, which gives an indication of the die temperature. The temperature value is read back as part of an ADC read sequence.
 +
 +====== Source Code ======
 +
 +===== Status =====
 +
 +^ Source ^ Mainlined? ^
 +| [[linux.github>xcomm_zynq?drivers/iio/dac/ad5592r-base.c|git]] | WIP |
 +
 +===== Files =====
 +
 +^ Function ^ File ^
 +| driver  | [[linux.github>xcomm_zynq?drivers/iio/dac/ad5592r-base.c | drivers/iio/dac/ad5592r-base.c]] |
 +| include  | [[linux.github>xcomm_zynq?drivers/iio/dac/ad5592r-base.h | drivers/iio/dac/ad5592r-base.h]] |
 +| driver  | [[linux.github>xcomm_zynq?drivers/iio/dac/ad5593r.c | drivers/iio/dac/ad5593r.c]] |
 +| include  | [[linux.github>xcomm_zynq?include/dt-bindings/iio/adi,ad5592r.h | include/dt-bindings/iio/adi,ad5592r.h]] |
 +| Documentation  | [[linux.github>xcomm_zynq?Documentation/devicetree/bindings/iio/dac/ad5592r.txt | Documentation/devicetree/bindings/iio/dac/ad5592r.txt]] |
  
 ====== Hardware configuration ====== ====== Hardware configuration ======
Line 164: Line 180:
                                 attr 2: scale value: 452.147700000                                 attr 2: scale value: 452.147700000
  
 +</code>
 +
 +=== GPIO Testing  ===
 +
 +The GPIO sysfs interface allows users to manipulate any GPIO from userspace. Userspace utilizes a sysfs control interface to dynamically request and release individual GPIOs. Once a GPIO has been requested, writing to the newly created path allows you to control the direction and the data while reading from it returns the GPIO data (which usually corresponds to a 0 or 1 which represents the signal level).
 +
 +For more information see also here: [[git.linux.org>Documentation/gpio.txt | GPIO Kernel Documentation]]
 +
 +<code>
 +root@linaro-ubuntu-desktop:~# cd /sys/class/gpio/
 +root@linaro-ubuntu-desktop:/sys/class/gpio# ls
 +export  gpiochip890  gpiochip898  gpiochip906  unexport
 +
 +root@linaro-ubuntu-desktop:/sys/class/gpio# cd gpiochip890
 +
 +root@linaro-ubuntu-desktop:/sys/class/gpio/gpiochip890# ls -al
 +total 0
 +drwxr-xr-x 3 root root    0 Jan  1  1970 .
 +drwxr-xr-x 3 root root    0 Jan  1  1970 ..
 +-r--r--r-- 1 root root 4096 Feb 23 08:06 base
 +lrwxrwxrwx 1 root root    0 Feb 23 08:06 device -> ../../../0-0010
 +-r--r--r-- 1 root root 4096 Feb 23 08:06 label
 +-r--r--r-- 1 root root 4096 Feb 23 08:06 ngpio
 +drwxr-xr-x 2 root root    0 Feb 23 08:06 power
 +lrwxrwxrwx 1 root root    0 Jan  1  1970 subsystem -> ../../../../../../../../class/gpio
 +-rw-r--r-- 1 root root 4096 Jan  1  1970 uevent
 +
 +root@linaro-ubuntu-desktop:/sys/class/gpio/gpiochip890# grep "" *
 +base:890
 +label:0-0010
 +ngpio:8
 +
 +
 +root@linaro-ubuntu-desktop:/sys/class/gpio/gpiochip890# cd ..
 +root@linaro-ubuntu-desktop:/sys/class/gpio# echo 897 > export 
 +root@linaro-ubuntu-desktop:/sys/class/gpio# cd gpio897/
 +root@linaro-ubuntu-desktop:/sys/class/gpio/gpio897# ls -al
 +total 0
 +drwxr-xr-x 3 root root    0 Feb 23 08:06 .
 +drwxr-xr-x 4 root root    0 Feb 23 08:06 ..
 +-rw-r--r-- 1 root root 4096 Feb 23 08:06 active_low
 +lrwxrwxrwx 1 root root    0 Feb 23 08:06 device -> ../../../0-0010
 +-rw-r--r-- 1 root root 4096 Feb 23 08:06 direction
 +drwxr-xr-x 2 root root    0 Feb 23 08:06 power
 +lrwxrwxrwx 1 root root    0 Feb 23 08:06 subsystem -> ../../../../../../../../class/gpio
 +-rw-r--r-- 1 root root 4096 Feb 23 08:06 uevent
 +-rw-r--r-- 1 root root 4096 Feb 23 08:06 value
 +
 +root@linaro-ubuntu-desktop:/sys/class/gpio/gpio897# cat direction 
 +in
 +
 +root@linaro-ubuntu-desktop:/sys/class/gpio/gpio897# cat value 
 +0
 +
 +root@linaro-ubuntu-desktop:/sys/class/gpio/gpio897# echo low > direction 
 +
 +root@linaro-ubuntu-desktop:/sys/class/gpio/gpio897# cat direction 
 +out
 +
 +root@linaro-ubuntu-desktop:/sys/class/gpio/gpio897# cat value 
 +0
 +
 +root@linaro-ubuntu-desktop:/sys/class/gpio/gpio897# echo high > direction                                                                                                                                    
 +
 +root@linaro-ubuntu-desktop:/sys/class/gpio/gpio897# cat value 
 +1
 </code> </code>
resources/tools-software/linux-drivers/iio-dac/ad5593r.txt · Last modified: 19 Jan 2018 10:12 by Alexandru Ardelean

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