Software: Difference between revisions
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|4. show if GPIO is used as an input or an output: <code>''cat direction''</code> | |4. show if GPIO is used as an input or an output: <code>''cat direction''</code> | ||
|- | |- | ||
|5. <code>'' | |5. change output to '1'=high: <code>''echo 1 >value''</code> | ||
|- | |- | ||
|6. change | |6. change GPIO to input: <code>''echo in >direction''</code> | ||
|- | |- | ||
|7 | |7. show input value: <code>''cat value''</code> | ||
|} | |} | ||
Latest revision as of 09:28, 8 August 2012
GPIOs
Mapping
In the following sheet you can find the GPIOs and their linux-number
Control
How to control a GPIO:
1. cd /sys/class/gpio2. create new directory: echo 44 >export3. go into this directory: cd gpio444. show if GPIO is used as an input or an output: cat direction5. change output to '1'=high: echo 1 >value6. change GPIO to input: echo in >direction7. show input value: cat value
PLD
Development Software
To write your own VDHL-code you can use the ispLEVER Classic Software from Lattice ([1]
You also need a programmer (e.g. HW-USBN-2A from Lattice) to deploy the VHDL-Code on your PLD.
After installing the software and the drivers for your programmer you can start a new project.
Programming example
You can find a demo-project here:media:PLD-demo.zip
You have to download the *.jed-File with the programmer to your PLD.
In the constraint editor of ispLEVER you can define, which input X_VAR1 is.
In this example GPIO E is defined as X_VAR1. If you define GPIO E as an
output and set GPIO E high, the PLD LED should flash red.
