Wiki

Analog Devices Wiki

English
English
简体中文
简体中文
日本語
日本語
Руccкий
Руccкий

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revision		Previous revision
resources:tools-software:linux-drivers:iio-adc:ad7124 [15 Oct 2018 17:00] – Driver testing Stefan Poparesources:tools-software:linux-drivers:iio-adc:ad7124 [01 Feb 2019 11:02] (current) – Update driver links with upstream version Stefan Popa
Line 21: Line 21:
  
 ^ Source ^ Mainlined? ^ ^ Source ^ Mainlined? ^
-| [[linux.github>master/drivers/iio/adc/ad7124.c|git]] | [In progress...] |+| [[git.linux.org>drivers/iio/adc/ad7124.c|git]] | [[git.linux.org>drivers/iio/adc/ad7124.c|Yes]]  |
  
 ===== Files ===== ===== Files =====
  
 ^ Function ^ File ^ ^ Function ^ File ^
-| driver  | [[linux.github>master/drivers/iio/adc/ad7124.c]] | +| driver  | [[git.linux.org>drivers/iio/adc/ad7124.c]] | 
-| devicetree bindings | [[linux.github>master?Documentation/devicetree/bindings/iio/adc/adi,ad7124.txt | Documentation/devicetree/bindings/iio/adc/adi,ad7124.txt]] |+| devicetree bindings | [[git.linux.org>Documentation/devicetree/bindings/iio/adc/adi,ad7124.txt | Documentation/devicetree/bindings/iio/adc/adi,ad7124.txt]] |
  
 ====== Driver testing ====== ====== Driver testing ======
Line 44: Line 44:
 iio:device0 iio:device0
  
 +root:/sys/bus/iio/devices> **cd iio\:device0**
  
 +root:/sys/bus/iio/devices/iio:device0> **ls -l**
 +drwxr-xr-x 2 root root    0 Jun 23 21:46 buffer
 +-r--r--r-- 1 root root 4096 Jun 23 21:46 dev
 +-rw-r--r-- 1 root root 4096 Jun 23 21:46 in_voltage0-voltage1_offset
 +-rw-r--r-- 1 root root 4096 Jun 23 21:46 in_voltage0-voltage1_raw
 +-rw-r--r-- 1 root root 4096 Jun 23 21:46 in_voltage0-voltage1_sampling_frequency
 +-rw-r--r-- 1 root root 4096 Jun 23 21:46 in_voltage0-voltage1_scale
 +-rw-r--r-- 1 root root 4096 Jun 23 21:46 in_voltage2-voltage3_offset
 +-rw-r--r-- 1 root root 4096 Jun 23 21:46 in_voltage2-voltage3_raw
 +-rw-r--r-- 1 root root 4096 Jun 23 21:46 in_voltage2-voltage3_sampling_frequency
 +-rw-r--r-- 1 root root 4096 Jun 23 21:46 in_voltage2-voltage3_scale
 +-rw-r--r-- 1 root root 4096 Jun 23 21:46 in_voltage4-voltage5_offset
 +-rw-r--r-- 1 root root 4096 Jun 23 21:46 in_voltage4-voltage5_raw
 +-rw-r--r-- 1 root root 4096 Jun 23 21:46 in_voltage4-voltage5_sampling_frequency
 +-rw-r--r-- 1 root root 4096 Jun 23 21:46 in_voltage4-voltage5_scale
 +-rw-r--r-- 1 root root 4096 Jun 23 21:46 in_voltage6-voltage7_offset
 +-rw-r--r-- 1 root root 4096 Jun 23 21:46 in_voltage6-voltage7_raw
 +-rw-r--r-- 1 root root 4096 Jun 23 21:46 in_voltage6-voltage7_sampling_frequency
 +-rw-r--r-- 1 root root 4096 Jun 23 21:46 in_voltage6-voltage7_scale
 +-r--r--r-- 1 root root 4096 Jun 23 21:46 name
 +lrwxrwxrwx 1 root root    0 Jun 23 21:46 of_node -> ../../../../../../../../firmware/devicetree/base/soc/spi@7e204000/ad7124-4@0
 +drwxr-xr-x 2 root root    0 Jun 23 21:46 power
 +drwxr-xr-x 2 root root    0 Jun 23 21:46 scan_elements
 +lrwxrwxrwx 1 root root    0 Jun 23 21:46 subsystem -> ../../../../../../../../bus/iio
 +drwxr-xr-x 2 root root    0 Jun 23 21:46 trigger
 +-rw-r--r-- 1 root root 4096 Jun 23 21:46 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**
 +ad7124-4
 +</xterm></WRAP>
 +
 +=== Show channel scale and offset ===
 +
 +**Description:**\\
 +Scales and offsets to be applied to in_voltagex_voltagey_raw in order to obdatin 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_voltage0-voltage1_scale **
 +0.000149011
 +root:/sys/bus/iio/devices/iio:device0> **cat in_voltage0-voltage1_offset **
 +0
 +root:/sys/bus/iio/devices/iio:device0> **cat in_voltage0-voltage1_raw **
 +2679470
 +</xterm></WRAP>
 +
 +**Description:**
 +Channel Ainp0-Ainm1 is configured as unipolar, with a gain of 1\\
 +**U** = //in_voltage0-voltage1_raw * in_voltage0-voltage1_scale - in_voltage0-voltage1_offset // = 2679470 * 0.000149011 - 0 = **399.27 //mV//**
 +
 +<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_voltage2-voltage3_scale **
 +0.000298023
 +root:/sys/bus/iio/devices/iio:device0> **cat in_voltage2-voltage3_offset **
 +-2500
 +root:/sys/bus/iio/devices/iio:device0> **cat in_voltage2-voltage3_raw **
 +9716211
 +</xterm></WRAP>
 +
 +**Description:**
 +Channel Ainp2-Ainm3 is configured as bipolar, with a gain of 1\\
 +**U** = //in_voltage2-voltage3_raw * in_voltage2-voltage3_scale - in_voltage2-voltage3_offset // = 9716211* 0.000298023 - 2500= **395.65 //mV//**
 +
 +=== Set sampling frequency ===
 +
 +**Description:**
 +The output data rate depends on the master clock frequency (fclk) which in turn determines the power mode:\\
 +  * Full power (fCLK = 614.4 kHz): 9.38 SPS to 19,200 SPS
 +  * Mid power (fCLK = 153.6 kHz): 2.34 SPS to 4800 SPS
 +  * Low power (fCLK = 76.8 kHz): 1.17 SPS to 2400 SPS
 +
 +<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_voltage0-voltage1_sampling_frequency**
 +10
 +root:/sys/bus/iio/devices/iio:device0> **cat in_voltage2-voltage3_sampling_frequency**
 +960
 +root:/sys/bus/iio/devices/iio:device0> **echo 2400 > in_voltage0-voltage1_sampling_frequency**
 +root:/sys/bus/iio/devices/iio:device0> **cat in_voltage0-voltage1_sampling_frequency**
 +2400
 +root:/sys/bus/iio/devices/iio:device0> **echo 5000 > in_voltage2-voltage3_sampling_frequency**
 +root:/sys/bus/iio/devices/iio:device0> **cat in_voltage2-voltage3_sampling_frequency**
 +4800
 +</xterm></WRAP>
 +
 +====== More Information ======
 +
 +{{page>software:linux:docs:iio:iio_snippets#iio pointers&noheader&firstseconly&noeditbtn}}
resources/tools-software/linux-drivers/iio-adc/ad7124.1539615641.txt.gz · Last modified: 15 Oct 2018 17:00 by Stefan Popa

Page Tools