backrsend40k.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 BackRSend40k( uchar pulse )   //CH4
{
	uint k = 350;
	
	PORTC = ( PORTC & 0xF3 ) | 0x04;
	while( --k );
	PORTA = ( PORTA & 0xF8 ) | 0x01;
	while( --pulse != 0 )
	{
		PORTC = ( PORTC & 0xF3 ) | 0x04;  
		Nop();                        
		Nop();                          
		Nop();                          
		Nop();                          
		Nop();                          
		Nop();                          
		Nop();                          
		Nop();                          
		Nop();	                        
		PORTC = ( PORTC & 0xF3 ) | 0x08;     
		Nop();                          
		Nop();                          
		Nop();                          
		Nop();                          
	}
	PORTC = PORTC & 0xF3;
}