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resources:tools-software:linux-drivers:iio-dac:ad5758 [23 May 2018 10:54] – Files Stefan Poparesources:tools-software:linux-drivers:iio-dac:ad5758 [15 Oct 2018 16:25] (current) – adc->dac Stefan Popa
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 ^ Source ^ Mainlined? ^ ^ Source ^ Mainlined? ^
-| [[https://github.com/analogdevicesinc/linux/blob/rpi-4.9.y/drivers/iio/dac/ad5758.c|git]] | [In progress...] |+| [[git.linux.org>drivers/iio/dac/ad5758.c|git]] | [[git.linux.org>drivers/iio/dac/ad5758.c|Yes]]  |
  
 ===== Files ===== ===== Files =====
  
 ^ Function ^ File ^ ^ Function ^ File ^
-| driver  | [[https://github.com/analogdevicesinc/linux/blob/rpi-4.9.y/drivers/iio/dac/ad5758.c]] |+| driver  | [[git.linux.org>drivers/iio/dac/ad5758.c]] | 
 + 
 +===== Devicetree ===== 
 + 
 +Required properties for the AD5758: 
 +  * compatible: Must be "adi,ad5758" 
 +  * reg: SPI chip select number for the device 
 +  * spi-max-frequency: Max SPI frequency to use (< 50000000) 
 +  * spi-cpha: is the only mode that is supported 
 + 
 +Optional properties: 
 + 
 +   * reset-gpios : GPIO spec for the RESET pin. If specified, it will be asserted during driver probe. 
 +   * adi,dc-dc-mode: Mode of operation of the dc-to-dc converter 
 +   * adi,dc-dc-ilim: The dc-to-dc converter current limit 
 +   * adi,slew: Array of slewrate settings should contain 3 fields: 
 +   * adi,range: The output range 
 + 
 +<code> 
 + #address-cells = <1>; 
 + #size-cells = <0>; 
 + status = "okay"; 
 + 
 + ad5758@0 { 
 +                compatible = "adi,ad5758"; 
 +                reg = <0>; 
 +                spi-max-frequency = <1000000>; 
 +                spi-cpha; 
 + 
 +                reset-gpios = <&gpio 22 0>;  /* optional */ 
 + 
 +                adi,dc-dc-mode = <2>; 
 +                adi,dc-dc-ilim = <200>; 
 +                adi,slew = <1 200000 12>; 
 +                adi,range = <1>; 
 +</code> 
 + 
 +====== Driver testing ====== 
 + 
 +<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** 
 +-r--r--r-- 1 root root 4096 May 23 09:14 dev 
 +-rw-r--r-- 1 root root 4096 May 23 09:14 out_voltage0_powerdown 
 +-rw-r--r-- 1 root root 4096 May 23 09:14 out_voltage0_raw 
 +-rw-r--r-- 1 root root 4096 May 23 09:14 out_voltage_scale 
 +-r--r--r-- 1 root root 4096 May 23 09:14 name 
 +drwxr-xr-x 2 root root    0 May 23 09:14 power 
 +lrwxrwxrwx 1 root root    0 May 23 09:14 subsystem -> ../../../../../../../../bus/iio 
 +-rw-r--r-- 1 root root 4096 May 23 09:14 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** 
 +ad5758 
 +</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 out_voltage_scale ** 
 +0.152587890 
 +</xterm></WRAP> 
 + 
 +=== Set channel 0 output voltage === 
 + 
 +**Description:**\\ 
 +/sys/bus/iio/devices/deviceX/out_voltage0_raw\\ 
 + 
 +Raw (unscaled, no bias etc.) output voltage for 
 +channel 0. 
 + 
 + 
 +<WRAP box bggreen><wrap info>This specifies any shell prompt running on the target</wrap> 
 +<xterm> 
 +root:/sys/bus/iio/devices/iio:device0> **echo 32767 > out_voltage0_raw** 
 +</xterm></WRAP> 
 + 
 +**U** = //out_voltage0_raw * out_voltage_scale// = 32767 * 0.152587890 = **4999.84 //mV//** 
 + 
 +=== Enable power down mode on output 0 === 
 + 
 +/sys/bus/iio/devices/deviceX/out_voltage0_powerdown 
 + 
 +**Description:**\\ 
 +Writing 1 causes output 0 to enter the power down mode. Clearing returns to 
 +normal operation. 
 + 
 +<WRAP box bggreen><wrap info>This specifies any shell prompt running on the target</wrap> 
 +<xterm> 
 +root:/sys/bus/iio/devices/iio:device0> **echo 1 > out_voltage0_powerdown** 
 +root:/sys/bus/iio/devices/iio:device0>  **cat out_voltage0_powerdown** 
 +1 
 +root:/sys/bus/iio/devices/iio:device0> **echo 0 > out_voltage0_powerdown** 
 +root:/sys/bus/iio/devices/iio:device0>  **cat out_voltage0_powerdown** 
 +0 
 +</xterm></WRAP> 
 + 
 +====== More Information ====== 
 + 
 +{{page>software:linux:docs:iio:iio_snippets#iio pointers&noheader&firstseconly&noeditbtn}} 
resources/tools-software/linux-drivers/iio-dac/ad5758.txt · Last modified: 15 Oct 2018 16:25 by Stefan Popa

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