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How to use UARTs

816 bytes added, 13:32, 20 January 2012

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As explained above, the program uses GPIO for debug option via oscilloscope, it is necessary install user-gpio-drv.ko driver inside Linux Kernel, more information [[How to use GPIOs|here]] .

There are some things that is interesting configure, before compiling the program. Open it, seek next lines:

<pre>//Define Array char size

#define SIZE 30

//Define Debug mode:0==Disable

#define DEBUG 0

//Define wait select

#define WAIT 5

Once you have installed module. Compile program using your Cross Compiler, I //Set GPIO Debugger port//Be sure that mux is correctly configured and GPIOs are not used arm-linux-gnueabi-#define GPIO1 136#define GPIO2 137 </pre> Constant SIZE:it determine the max number of char than can be sent<br>

Constant DEBUG: it can break program infinite loop part, it can be useful to debug some errors, 0 like infinite loop or positive number determine loop max entrances<br>

 

Constant WAIT: configure select max time.

 

Constants GPIO1 and GPIO2: they configure GPIOs used for debug via oscilloscope. Take care to configure mux and don't use this GPIO for other purposes<br>

 

Once you have installed module. Compile program using your Cross Compiler, I used arm-linux-gnueabi-:

<pre>arm-linux-gnueabi-gcc uart-test-beta1.c -o uart-test-beta1 </pre>

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