Difference between revisions of "DAC"
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The DAC '''max5821L''' can be controlled from the user space by using the setDAC function | The DAC '''max5821L''' can be controlled from the user space by using the setDAC function | ||
| − | + | ==Installation== | |
| + | ===Linux=== | ||
| + | Activate the necessary I2C drivers in the Linux kernel configuration (modules or builtin): | ||
* -> Device Drivers | * -> Device Drivers | ||
| Line 8: | Line 10: | ||
* -> I2C support -> I2C Hardware Bus support -> I2C bus on i.MX | * -> I2C support -> I2C Hardware Bus support -> I2C bus on i.MX | ||
| + | ===Buildroot=== | ||
You must enable the '''max5821ctrl''' package into your buildroot configuration:<br> | You must enable the '''max5821ctrl''' package into your buildroot configuration:<br> | ||
Board support Options->Board support for the Armadeus development boards->armadeus packages | Board support Options->Board support for the Armadeus development boards->armadeus packages | ||
| − | If you are using modules instead linux drivers, | + | |
| − | you can check if the modules are loaded with: | + | If you are using modules instead of builtin linux drivers, you can check if the modules are loaded with: |
# lsmod | # lsmod | ||
i2c_imx 4008 0 | i2c_imx 4008 0 | ||
| Line 18: | Line 21: | ||
i2c_core 11472 2 i2c_imx,i2c_dev | i2c_core 11472 2 i2c_imx,i2c_dev | ||
| − | + | ==Usage== | |
to set the DAC use the '''setDAC''' command: | to set the DAC use the '''setDAC''' command: | ||
# setDAC | # setDAC | ||
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Do not forget to connect a voltage reference for the DAC | Do not forget to connect a voltage reference for the DAC | ||
| + | |||
| + | ==Links== | ||
| + | * [http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3288 Max5821 Webpage] | ||
Revision as of 18:18, 8 May 2007
The DAC max5821L can be controlled from the user space by using the setDAC function
Contents
Installation
Linux
Activate the necessary I2C drivers in the Linux kernel configuration (modules or builtin):
- -> Device Drivers
- -> I2C support
- -> I2C support -> I2C device interface
- -> I2C support -> I2C Hardware Bus support -> I2C bus on i.MX
Buildroot
You must enable the max5821ctrl package into your buildroot configuration:
Board support Options->Board support for the Armadeus development boards->armadeus packages
If you are using modules instead of builtin linux drivers, you can check if the modules are loaded with:
# lsmod i2c_imx 4008 0 i2c_dev 5024 0 i2c_core 11472 2 i2c_imx,i2c_dev
Usage
to set the DAC 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 ##
Do not forget to connect a voltage reference for the DAC
