gfd.c

基于一款32位嵌入式微处理器的USB接口的测试代码

/****************************************************************
 *  Copyright (C) Asic Center. 2001
 *  All Rights Reserved
 *
 *  Filename : EPSONC33.h
 *  Function : hardware abstract layer(HAL)
 *  Revision :
 *		2002/4/17	PESSIA	Create this file
 *****************************************************************/

void enable_irq(){
	int tmp;
	__asm{
		mrs tmp, CPSR	
		bic tmp,tmp,#0x80  
		msr CPSR_c,tmp	
		}
	}
	
void disable_irq(){
	int tmp;
	__asm{
		mrs tmp, CPSR	
		orr tmp,tmp,#0x80  
		msr CPSR_c,tmp	
		}
	}
	
void erter_crtical_section(){
	int tmp;
	__asm{
		mrs tmp, CPSR	
		orr tmp,tmp,#0x80  
		msr CPSR_c,tmp	
		}
	}
	
void exit_crtical_section(){
	int tmp;
	__asm{
		mrs tmp, CPSR	
		bic tmp,tmp,#0x80  
		msr CPSR_c,tmp	
		}
	}
	
	
void extend_psr_to_32(void)	{

}