backlsend40k.c

来自「一个带CANBUS的倒车雷达源码！希望大家能用的上！」· C语言 代码 · 共 30 行

#include "config.h"

void BackLSend40k( uchar pulse )  //CH1
{
	uint k = 350;
	
	PORTC = ( PORTC & 0x3F ) | 0x80;
	while( --k );
	PORTA = ( PORTA & 0xF8 ) | 0x05;
	while( --pulse != 0 )
	{
		PORTC = ( PORTC & 0x3F ) | 0x80;  
		Nop();                        
		Nop();                          
		Nop();                          
		Nop();                          
		Nop();                          
		Nop();                          
		Nop();                          
		Nop();                          
		Nop();	                        
		PORTC = ( PORTC & 0x3F ) | 0x40;     
		Nop();                          
		Nop();                          
		Nop();                          
		Nop();                          
	}
	PORTC = PORTC & 0x3F;
}