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<pre>//Define Array char size
#define SIZE 30
//Buffer lenght
#define MAX_BUF 64
//Define Debug mode:0==Disable
#define DEBUG 0
//User interface default path
#define SYSFS_GPIO_DIR "/sys/class/gpio"
//Define wait select
//Set GPIO Debugger port
//Be sure that mux is correctly configured and GPIOs are not used
#define GPIO1 136158#define GPIO2 137 162</pre>
Constant SIZE: it determines the max number of char than can be sent<br>