freqhop.c

基于跳频的音频连接系统设计（Mono Audio Link Using Frequency Hopping）及源代码

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 *      ***   +++   ***                                                                                *
 *      ***   + +   ***                                                                                *
 *      ***   +                        					Frequency Hopping module                       *
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 * Compiler: Keil C51                                                                                  *
 * Target platform:  8051F005                                                                          *
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 * Revision history:   																				   *
 * Initial release, HKI, 01.08.2004    			                                                       *
 ******************************************************************************************************/

#pragma REGISTERBANK(0)
#pragma OPTIMIZE(4, SPEED)
#pragma REGPARMS

#include <Cinclude.h>

 /*****************************************************************************************************/

UINT16 data f;			// Next channel			
BYTE data fN;			// Next channel (temporary variable for calculation)
BYTE data fN_1;        // Previous channel/LCG seed
BYTE data fhiLevel;		// Frequency hopping incident level (number of timeouts)


// Reset the frequency hopping timer 
// (this function is slightly to large to be a macro)
void resetFHtimer(BYTE fhiLevel) {

	DISABLE_FH_TIMER(); 
	CLEAR_FH_TIMER_OVERFLOW_FLAG();

	switch(fhiLevel) { 
		case FHI_NORMAL: 		
			TL2 = FH_TIMER_AUTORELOAD_L; 
			TH2 = FH_TIMER_AUTORELOAD_H; 
			break; 
		case FHI_MID:
			TL2 = FH_TIMER_MID_L;
			TH2 = FH_TIMER_MID_H;
			break;
		case FHI_MAX:
			TL2 = FH_TIMER_MAX_L;
			TH2 = FH_TIMER_MAX_H;
			break;
		default:
			TL2 = FH_TIMER_AUTORELOAD_L; 
			TH2 = FH_TIMER_AUTORELOAD_H;  
			break;
	}
}