Difference between revisions of "DAC"

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The DAC '''max5821L''' can be controlled from the user space by using the setDAC function
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The [[Max5821 | Max5821L DAC]] can be controlled from the user space by using the '''setDAC''' function. No special driver is needed except the i2c host one, which is statically built into the kernel.
  
The Linux kernel configuration must enable the necessary I2C drivers (modules):
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==Installation==
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Not needed on latest versions (> Armadeus 3.0): the tool is installed by default. Informations are kept [[Talk:DAC|here]].
  
* -> I2C support
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==Usage==
* -> I2C support -> I2C device interface
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To set the DAC outputs to a given value, use the ''setDAC'' command:
* -> I2C support -> I2C Hardware Bus support -> I2C bus on i.MX
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<pre class="apf">
 
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You must enable the '''max5821ctrl''' package into your buildroot configuration:<br>
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Board support Options->Board support for the Armadeus development boards->armadeus packages
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If you are using modules instead linux drivers,
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you can check if the modules are loaded with:
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# lsmod
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i2c_imx                4008  0
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i2c_dev                5024  0
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i2c_core              11472  2 i2c_imx,i2c_dev
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to set the DAC use the '''setDAC''' command:
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  # setDAC
 
  # setDAC
 
   
 
   
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   If no VALUE is given, then the output is powered down
 
   If no VALUE is given, then the output is powered down
 
  ##
 
  ##
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</pre>
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{{Warning|Do not forget to connect a voltage reference for the DAC !!}}
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==Links==
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* [[Max5821|How to connect Max5821 on your board]]
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* [http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3288 Max5821 Webpage]
  
Do not forget to connect a voltage reference for the DAC
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[[Category:Linux drivers]]

Latest revision as of 22:56, 27 October 2009

The Max5821L DAC can be controlled from the user space by using the setDAC function. No special driver is needed except the i2c host one, which is statically built into the kernel.

Installation

Not needed on latest versions (> Armadeus 3.0): the tool is installed by default. Informations are kept here.

Usage

To set the DAC outputs to a given value, use the setDAC command:

 # setDAC
 
 ##Usage: setDAC OUTPUT [VALUE]
 power down or set DAC output with value 0 - 1023
 
  OUTPUT is A , B or AB (both)
  VALUE must be 0 - 1023
 
  If no VALUE is given, then the output is powered down
 ##
Warning Warning: Do not forget to connect a voltage reference for the DAC !!


Links