I.MX6UL internal ADC - Revision history

SebastienSz at 09:52, 18 May 2017

2017-05-18T09:52:19Z

SebastienSz: /* Introduction */ pin 12 and 9 are on J3

2017-04-25T14:47:43Z

‎Introduction: pin 12 and 9 are on J3

JulienB: /* Links */

2017-03-27T14:07:03Z

‎Links

JulienB: /* Read channels value */

2017-03-27T14:04:04Z

‎Read channels value

JulienB: /* Introduction */

2017-03-27T14:02:57Z

‎Introduction

JulienB: /* Read channels value */

2016-12-19T17:26:03Z

‎Read channels value

JulienB: /* Introduction */

2016-12-19T17:24:24Z

‎Introduction

JulienB: Created page with "== Introduction == This description uses Linux kernel > 3.7. i.MX6UL (processor of OPOS6UL has an integrated 12 bits 16 channels Analog to Digital Converter. Only chann..."

2016-12-19T16:06:36Z

Created page with "== Introduction == This description uses Linux kernel > 3.7. i.MX6UL (processor of OPOS6UL has an integrated 12 bits 16 channels Analog to Digital Converter. Only chann..."

New page

== Introduction ==

This description uses Linux kernel > 3.7.

i.MX6UL (processor of [[OPOS6UL]] has an integrated 12 bits 16 channels Analog to Digital Converter.

Only channels 0-6 may be used to generic conversions and channels 2, 3, 4, 5 are used for the touchscreen on [[OPOS6ULDev]].

* Channel 0 is available on J10 pin 38 of [[APF28Dev]]
* Channel 1 is available on J10 pin 36 of [[APF28Dev]]
* Channel 6 is available on J10 pin 35 of [[APF28Dev]]

== Driver ==
Driver is by default included if you choose an [[OPOS6UL]] as target.

Otherwise, you can select it that way:

<pre class="host">
[ ] $ make linux-menuconfig
</pre>

<pre class="config">
Device Drivers --->
...
<*> Industrial I/O support --->
...
Analog to digital converters
...
<*> Freescale vf610 ADC driver
</pre>

Then compile the distribution :
<pre class="host">
[ ] $ make linux && make
</pre>

== Use it ==

=== Read channels value ===

<pre class="apf">
# cd /sys/bus/iio/devices/iio:device0
# ls
buffer in_voltage11_raw in_voltage2_raw name
dev in_voltage12_raw in_voltage3_raw power
in_temp8_raw in_voltage13_raw in_voltage4_raw scan_elements
in_temp9_raw in_voltage14_raw in_voltage5_raw subsystem
in_voltage0_raw in_voltage15_raw in_voltage6_raw trigger
in_voltage10_raw in_voltage1_raw in_voltage7_raw uevent
</pre>

To read ADC value just «cat» the corresponding input file:
<pre class="apf">
# cat in_voltage0_raw for channel 0
4095
</pre>

All values are not converted (ie. directly show the register content). To have the mV value, you must doi: value_mV = read_value * 1850/4095

==Links==
* http://www.at91.com/linux4sam/bin/view/Linux4SAM/IioAdcDriver

[[Category:Linux drivers]]
[[Category:Analog to Digital Converter]]
[[Category:Industrial Input Output]]

@@ Line 12: / Line 12: @@
 * Channel 4 is available on J21 pin 37 of [[OPOS6ULDev]] (AIN4/XPUL: muxed with touchscreen)
 * Channel 8 is available on J3 pin 12 of [[OPOS6ULDev]] (AIN8)
-* Channel 9 is available on J3 pin  9 of [[OPOS6ULDev]] (AIN9)
+* Channel 9 is available on J3 pin  7 of [[OPOS6ULDev]] (AIN9)
 == Driver ==

@@ Line 11: / Line 11: @@
 * Channel 3 is available on J21 pin 39 of [[OPOS6ULDev]] (AIN3/XNUR: muxed with touchscreen)
 * Channel 4 is available on J21 pin 37 of [[OPOS6ULDev]] (AIN4/XPUL: muxed with touchscreen)
-* Channel 8 is available on J21 pin 12 of [[OPOS6ULDev]] (AIN8)
+* Channel 8 is available on J3 pin 12 of [[OPOS6ULDev]] (AIN8)
-* Channel 9 is available on J21 pin  9 of [[OPOS6ULDev]] (AIN9)
+* Channel 9 is available on J3 pin  9 of [[OPOS6ULDev]] (AIN9)
 == Driver ==

← Older revision		Revision as of 14:07, 27 March 2017
Line 70:		Line 70:

	All values are not converted (ie. directly show the register content). To have the mV value, you must do: value_mV = read_value * 3300/4095		All values are not converted (ie. directly show the register content). To have the mV value, you must do: value_mV = read_value * 3300/4095
		+
		+	==AsDevices==
		+	* You can access this device from your C/C++ application using ''as_adc_xxx_iio'' functions from [[AsDevices]]
		+	* ''target/demos/oscillo'' is a "good" example to start with...

	==Links==		==Links==

@@ Line 69: / Line 69: @@
 </pre>
-All values are not converted (ie. directly show the register content). To have the mV value, you must doi: value_mV = read_value * 3300/4095
+All values are not converted (ie. directly show the register content). To have the mV value, you must do: value_mV = read_value * 3300/4095
 ==Links==

@@ Line 11: / Line 11: @@
 * Channel 3 is available on J21 pin 39 of [[OPOS6ULDev]] (AIN3/XNUR: muxed with touchscreen)
 * Channel 4 is available on J21 pin 37 of [[OPOS6ULDev]] (AIN4/XPUL: muxed with touchscreen)
 == Driver ==

@@ Line 43: / Line 43: @@
 # cd /sys/bus/iio/devices/iio:device0
 # ls
-buffer                   in_voltage11_raw  in_voltage2_raw   name
+buffer                         in_voltage5_raw
-dev                       in_voltage12_raw  in_voltage3_raw   power
+current_timestamp_clock        in_voltage6_raw
-in_temp8_raw      in_voltage13_raw  in_voltage4_raw   scan_elements
+dev                            in_voltage7_raw
-in_temp9_raw      in_voltage14_raw  in_voltage5_raw   subsystem
+in_conversion_mode             in_voltage8_raw
-in_voltage0_raw   in_voltage15_raw  in_voltage6_raw   trigger
+in_temp_input                  in_voltage9_raw
-in_voltage10_raw in_voltage1_raw   in_voltage7_raw   uevent
+in_voltage0_raw                in_voltage_sampling_frequency
 </pre>
 To read ADC value just «cat» the corresponding input file:
 <pre class="apf">
-# cat in_voltage0_raw       for channel 0
+# cat in_voltage1_raw       for channel 1 (ADC1_IN1)
 </pre>
-All values are not converted (ie. directly show the register content). To have the mV value, you must doi: value_mV = read_value * 1850/4095
+All values are not converted (ie. directly show the register content). To have the mV value, you must doi: value_mV = read_value * 3300/4095
 ==Links==

@@ Line 1: / Line 1: @@
 == Introduction ==
-This description uses Linux kernel > 3.7.
+This description uses Linux kernel >= 4.8.
 i.MX6UL (processor of [[OPOS6UL]] has an integrated 12 bits 16 channels Analog to Digital Converter.
@@ Line 7: / Line 7: @@
 Only channels 0-6 may be used to generic conversions and channels 2, 3, 4, 5 are used for the touchscreen on [[OPOS6ULDev]].
-* Channel 0 is available on J10 pin 38 of [[APF28Dev]]
+* Channel 1 is available on J21 pin 40 of [[OPOS6ULDev]] (AIN1/YNLR: muxed with touchscreen)
-* Channel 1 is available on J10 pin 36 of [[APF28Dev]]
+* Channel 2 is available on J21 pin 38 of [[OPOS6ULDev]] (AIN2/YPLL: muxed with touchscreen)
-* Channel 6 is available on J10 pin 35 of [[APF28Dev]]
+* Channel 3 is available on J21 pin 39 of [[OPOS6ULDev]] (AIN3/XNUR: muxed with touchscreen)
 == Driver ==