MCP4912 - Revision history

WikiSysop: /* Driver */

2013-09-04T18:39:06Z

Driver

← Older revision		Revision as of 20:39, 4 September 2013
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	<pre class="host">		<pre class="host">
	~~[ ]~~ $ make ~~linux26~~-menuconfig		$ make linux-menuconfig
	</pre>		</pre>

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	Then compile the distribution :		Then compile the distribution :
	<pre class="host">		<pre class="host">
	~~[ ]~~ $ make ~~linux26~~ && make		$ make linux && make
	</pre>		</pre>

Jorasse: /* Use it */

2013-03-11T13:54:49Z

Use it

← Older revision		Revision as of 15:54, 11 March 2013
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	</pre>		</pre>

			=== Synchronize channels update ===
	To have both channels output updated simultaneously (value 2V) when setting the DAC B channel :		To have both channels output updated simultaneously (value 2V) when setting the DAC B channel :
	<pre class="apf">		<pre class="apf">

Jorasse: /* Set channel values */

2013-03-07T08:06:32Z

Set channel values

← Older revision		Revision as of 10:06, 7 March 2013
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	</pre>		</pre>

	To have both channels output updated (value 2V) when setting the DAC B channel :		To have both channels output updated simultaneously (value 2V) when setting the DAC B channel :
	<pre class="apf">		<pre class="apf">
	# echo 0 > dac_trigger_0		# echo 0 > dac_trigger_0

Jorasse: /* Set channel values */

2013-03-07T08:02:48Z

Set channel values

← Older revision		Revision as of 10:02, 7 March 2013
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	# cd /sys/bus/spi/devices/spi0.1/device0		# cd /sys/bus/spi/devices/spi0.1/device0
	# ls		# ls
	dac_power_mode_0 out0_raw ~~power uevent~~		dac_power_mode_0 dac_trigger_1 power
	~~dac_power_mode_1~~ out1_raw ~~subsystem~~		dac_power_mode_1 out0_raw subsystem
			dac_trigger_0 out1_raw uevent
	</pre>		</pre>

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	<pre class="apf">		<pre class="apf">
	# echo 412 > out1_raw		# echo 412 > out1_raw
			</pre>

			To have both channels output updated (value 2V) when setting the DAC B channel :
			<pre class="apf">
			# echo 0 > dac_trigger_0
			# echo 1 > dac_trigger_1
			# echo 825 > out0_raw
			# echo 825 > out1_raw
	</pre>		</pre>

Salocin68: /* Connections */

2011-10-07T06:05:27Z

Connections

← Older revision		Revision as of 08:05, 7 October 2011
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	On your [[APF51Dev]] there are 2 signals to use:		On your [[APF51Dev]] there are 2 signals to use:
	* DAC_OUTA: corresponds to OUTA (pin 1 of J5 on the [[APF51Dev]]). It's the first output.		* DAC_OUTA: corresponds to OUTA (pin 1 of J5 on the [[APF51Dev]]). It's the first output.
	* DAC_OUTB: corresponds to OUTB (pin 10 of J5 on the [[APF51Dev]]). It's the 2nd output.		* DAC_OUTB: corresponds to OUTB (pin 3 of J5 on the [[APF51Dev]]). It's the 2nd output.

	The default output voltage range is [0-2.5V] on the [[APF51Dev]] (because the 2,5V reference output of the [[AS1531]] is used as reference input for the MCP4912).		The default output voltage range is [0-2.5V] on the [[APF51Dev]] (because the 2,5V reference output of the [[AS1531]] is used as reference input for the MCP4912).

JulienB: /* Description */

2011-10-06T20:01:19Z

Description

← Older revision		Revision as of 22:01, 6 October 2011
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	=Description=		==Description==
	This 2 channels 10bits [[SPI]] DAC (Digital to Analog Converter) is mounted ~~in standard~~ on the [[APF51Dev]] development boards.		This 2 channels 10bits [[SPI]] DAC (Digital to Analog Converter) is mounted on the [[APF51Dev]] development boards.

	==Connections==		==Connections==
	On your [[APF51Dev]] there are 2 signals to use:		On your [[APF51Dev]] there are 2 signals to use:
	* DAC_OUTA: corresponds to OUTA (pin 1 of J5 on the APF51Dev). It's the first output.		* DAC_OUTA: corresponds to OUTA (pin 1 of J5 on the [[APF51Dev]]). It's the first output.
	* DAC_OUTB: corresponds to OUTB (pin 10 of J5 on the APF51Dev). It's the 2nd output.		* DAC_OUTB: corresponds to OUTB (pin 10 of J5 on the [[APF51Dev]]). It's the 2nd output.

	The default output voltage range is 0->2.5V on the APF51Dev because the reference output of the [[AS1531]] is used as reference for the ~~mcp4912~~		The default output voltage range is [0-2.5V] on the [[APF51Dev]] (because the 2,5V reference output of the [[AS1531]] is used as reference input for the MCP4912).

	== Driver ==		== Driver ==

	The driver is included in ARMadeus distribution, and has to be selected (done by default on [[APF51]]):		The driver is included in the ARMadeus distribution, and has to be selected (done by default on [[APF51]]):

	<pre class="host">		<pre class="host">
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	== Use it ==		== Use it ==
	=== ~~modprobe~~ ===		=== Load driver ===
	To use the DAC first load module:		To use the DAC first load module:

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	</pre>		</pre>

	=== ~~set~~ values ===		=== Set channel values ===
	<pre class="apf">		<pre class="apf">
	# cd /sys/bus/spi/devices/spi0.1/device0		# cd /sys/bus/spi/devices/spi0.1/device0
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	</pre>		</pre>

	To set the ~~dac~~ A value to 2.48V (max range) :		To set the DAC A channel value to 2.48V (max range) :
	<pre class="apf">		<pre class="apf">
	# echo 1023 > out0_raw		# echo 1023 > out0_raw
	</pre>		</pre>

	To set the ~~dac~~ B value to 1V :		To set the DAC B channel value to 1V :
	<pre class="apf">		<pre class="apf">
	# echo 412 > out1_raw		# echo 412 > out1_raw

JulienB: /* Driver */

2011-05-03T08:41:26Z

Driver

← Older revision		Revision as of 10:41, 3 May 2011
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	== Driver ==		== Driver ==

	The driver is included in ARMadeus distribution, ~~then~~ to ~~use it, select it~~ :		The driver is included in ARMadeus distribution, and has to be selected (done by default on [[APF51]]):

	<pre class="host">		<pre class="host">
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	Then compile the distribution :		Then compile the distribution :
	<pre class="host">		<pre class="host">
	[ ] $ make linux26;make		[ ] $ make linux26 && make
	</pre>		</pre>

Salocin68: /* Connections */

2011-04-26T14:08:45Z

Connections

← Older revision		Revision as of 16:08, 26 April 2011
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	==Connections==		==Connections==
	On your ~~Devlight/DevFull~~ there are 3 signals to use ~~the Max5821~~:		On your [[APF51Dev]] there are 2 signals to use:
	* DAC_OUTA: corresponds to OUTA (pin 1 of J5 on the APF51Dev). It's the first output.		* DAC_OUTA: corresponds to OUTA (pin 1 of J5 on the APF51Dev). It's the first output.
	* DAC_OUTB: corresponds to OUTB (pin 10 of J5 on the APF51Dev). It's the 2nd output.		* DAC_OUTB: corresponds to OUTB (pin 10 of J5 on the APF51Dev). It's the 2nd output.

Salocin68: /* Use it */

2011-04-26T14:07:48Z

Use it

← Older revision		Revision as of 16:07, 26 April 2011
Line 45:		Line 45:
	</pre>		</pre>

	To set the dac value :		To set the dac A value to 2.48V (max range) :
	<pre class="apf">		<pre class="apf">
	# ~~cat in5_input~~		# echo 1023 > out0_raw
	~~887~~		</pre>

			To set the dac B value to 1V :
			<pre class="apf">
			# echo 412 > out1_raw
	</pre>		</pre>

Salocin68: /* set values */

2011-04-26T14:01:22Z

set values

← Older revision		Revision as of 16:01, 26 April 2011
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	=== set values ===		=== set values ===
	<pre class="apf">		<pre class="apf">
	# cd /sys/bus/spi/devices/spi0.1/		# cd /sys/bus/spi/devices/spi0.1/device0
	# ls		# ls
	dac_power_mode_0 out0_raw power uevent		dac_power_mode_0 out0_raw power uevent