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resources:tools-software:linux-drivers:iio-adc:ad7768 [05 Jul 2018 12:12]
Stefan Popa created
resources:tools-software:linux-drivers:iio-adc:ad7768 [05 Jul 2018 15:07] (current)
Stefan Popa More Information
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-====== AD7768 IIO 8-channel, ​24-bitSimultaneous Sampling ​ADC Linux Driver ======+====== AD7768 IIO Precision ADC Linux Driver ====== 
 + 
 +===== Supported Devices ===== 
 + 
 +This driver supports the 
 +  * [[adi>​AD7768]] 
 + 
 +===== Evaluation Boards ===== 
 + 
 +  * [[adi>​EVAL-AD7768]] 
 + 
 +===== Description ===== 
 + 
 +This is a Linux industrial I/O ([[software:​linux:​docs:​iio:​iio|IIO]]) subsystem driver, targeting single ​channel ​serial interface ADCs. 
 +The industrial I/O subsystem provides a unified framework for drivers for many different types of converters and sensors using a number of different physical interfaces (i2cspi, etc).  
 +See [[software:​linux:​docs:​iio:​iio|IIO]] for more information. 
 + 
 +====== Source Code ====== 
 + 
 +===== Status ===== 
 + 
 +^ Source ^ Mainlined? ^ 
 +| [[linux.github>​master/​drivers/​iio/​adc/​ad7768.c|git]] | [In progress...] | 
 + 
 +===== Files ===== 
 + 
 +^ Function ^ File ^ 
 +| driver ​ | [[linux.github>​master/​drivers/​iio/​adc/​ad7768.c]] | 
 +| devicetree bindings | [[linux.github>​master?​Documentation/​devicetree/​bindings/​iio/​adc/​adi,​ad7768.txt | Documentation/​devicetree/​bindings/​iio/​adc/​adi,​ad7768.txt]] | 
 +| hdl project | [[https://​github.com/​analogdevicesinc/​hdl/​tree/​hdl_2017_r1/​projects/​ad7768evb | hdl]] | 
 + 
 +====== Example Linux Device-Tree Initialization ====== 
 + 
 +Required properties:​ 
 +  * compatible: Must be one of "adi,ad7768"​. 
 +  * reg: SPI chip select number for the device. 
 +  * spi-max-frequency:​ See Documentation/​devicetree/​bindings/​spi/​spi-bus.txt. 
 +  * dmas: DMA specifier, consisting of a phandle to DMA controller node. 
 +  * dma-names: Must be "​rx"​. 
 +  * vref-supply:​ phandle to the regulator for ADC reference voltage. 
 + 
 +^ Function ^ File ^ 
 +| AD7768 Device Tree  | [[linux.github>​master?​arch/​arm/​boot/​dts/​zynq-zed-adv7511-ad7768.dts 
 +| zynq-zed-adv7511-ad7768.dts]] | 
 + 
 +====== ​Driver ​testing ====== 
 + 
 +{{page>​software:​linux:​docs:​iio:​iio_snippets#​iio device files&​noheader&​firstseconly&​noeditbtn}} 
 + 
 +<WRAP top tip round box 60%>​**TIP:​** 
 +An example program which uses the interface can be found here: 
 +  * [[resources:​tools-software:​linux-software:​iio_oscilloscope|IIO Oscilloscope]] 
 +</​WRAP>​\\ 
 + 
 +<WRAP box bggreen><​wrap info>​This specifies any shell prompt running on the target</​wrap>​ 
 +<​xterm>​ 
 +root:/> **cd /​sys/​bus/​iio/​devices/​** 
 +root:/​sys/​bus/​iio/​devices>​ ls 
 +iio:​device0 
 + 
 +root:/​sys/​bus/​iio/​devices>​ **cd iio\:​device0** 
 + 
 +root:/​sys/​bus/​iio/​devices/​iio:​device0>​ **ls -l** 
 +drwxrwxrwx 2 root root    0 Jan  1 00:02 buffer 
 +-rw-rw-rw- 1 root root 4096 Jan  1 00:02 dev 
 +-rw-rw-rw- 1 root root 4096 Jan  1 00:02 in_voltage_scale 
 +-rw-rw-rw- 1 root root 4096 Jan  1 00:02 name 
 +lrwxrwxrwx 1 root root    0 Jan  1 00:02 of_node -> ../​../​../​../​../​../​../​../​firmware/​devicetree/​base/​amba/​spi@e0006000/​adc@0 
 +drwxrwxrwx 2 root root    0 Jan  1 00:02 power 
 +drwxrwxrwx 2 root root    0 Jan  1 00:02 scan_elements 
 +lrwxrwxrwx 1 root root    0 Jan  1 00:02 subsystem -> ../​../​../​../​../​../​../​../​bus/​iio 
 +-rw-rw-rw- 1 root root 4096 Jan  1 00:02 uevent 
 +</​xterm></​WRAP>​ 
 + 
 +=== Show device name === 
 + 
 +<WRAP box bggreen><​wrap info>​This specifies any shell prompt running on the target</​wrap>​ 
 +<​xterm>​ 
 +root:/​sys/​bus/​iio/​devices/​iio:​device0>​ **cat name** 
 +ad7768 
 +</​xterm></​WRAP>​ 
 + 
 +=== Show scale === 
 + 
 +**Description:​**\\ 
 +scale to be applied to in_voltage0_raw in order to obtain the measured voltage in millivolts. 
 + 
 +<WRAP box bggreen><​wrap info>​This specifies any shell prompt running on the target</​wrap>​ 
 +<​xterm>​ 
 +root:/​sys/​bus/​iio/​devices/​iio:​device0>​ **cat in_voltage_scale ** 
 +0.000488281 
 +</​xterm></​WRAP>​ 
 + 
 +====== More Information ​====== 
 + 
 +{{page>​software:​linux:​docs:​iio:​iio_snippets#​iio pointers&​noheader&​firstseconly&​noeditbtn}}
resources/tools-software/linux-drivers/iio-adc/ad7768.1530785561.txt.gz · Last modified: 05 Jul 2018 12:12 by Stefan Popa