/* sonar.h */
#define H_THERSHOLD 54			// 3 feet
//#define H_THERSHOLD 18			// 18, 1 feet
#define L_THERSHOLD 9			// 6 inches
//#define L_THERSHOLD 36			// 2 feet

#define RELOAD      208        /* Reload value for 0.1 milliseconds for 25MHz */
//#define RELOAD      21        /* Reload value for 0.01 milliseconds for 25MHz */
#define RELOAD_LO   ((-RELOAD)&(0xFF))      /* Calculate low and high bytes */
#define RELOAD_HI   (((-RELOAD)&(0xFF00))/(256))


/* fire sonar and do distance calculations;
   signals serialTask to do RF stuff when user
   is near by
*/
void Sonar_Task();

/* called by Ext0 ISR in DETECTING_USER state */
void Sonar_Ext0_Handler();

/* called by Timer0 ISR in DETECTING_USER state */
void Sonar_Timer0_Handler();


void print(char c);
void putChar(unsigned char c);
void printInt(unsigned int i);