frontrsend40k.c

一个带CANBUS的倒车雷达源码！希望大家能用的上！

#include "config.h"

void FrontRSend40k( uchar pulse )  //CH6
{
	uint k = 350;
	
	PORTB = ( PORTB & 0x3F ) | 0x40;
	while( --k );
	PORTA = ( PORTA & 0xF8 ) | 0x03;
	while( --pulse != 0 )
	{
		PORTB = ( PORTB & 0x3F ) | 0x40;  
		Nop();                        
		Nop();                          
		Nop();                          
		Nop();                          
		Nop();                          
		Nop();                          
		Nop();                          
		Nop();                          
		Nop();	                        
		PORTB = ( PORTB & 0x3F ) | 0x80;     
		Nop();                          
		Nop();                          
		Nop();                          
		Nop();                          
	}
	PORTB = PORTB & 0x3F;
}