led.c

嵌入式系统作业。本实验是编写程序

/*********************************************************************************************
* File：	led.c
* Author:	embest
* Desc：	control board's LEDs
* History:	
*********************************************************************************************/
#include "44b.h"
#include "44blib.h"

/*------------------------------------------------------------------------------------------*/
/*                                     global variables                                     */
/*------------------------------------------------------------------------------------------*/
int f_nLedState;                                                // LED status   
            
/*------------------------------------------------------------------------------------------*/
/*                                     function declare                                     */
/*------------------------------------------------------------------------------------------*/
void led_test();                                                // LED test	
void led1_on();                                                 // led 1 on 
void led1_off();                                                // led 1 off 	
void led2_on();                                                 // led 2 on 
void led2_off();                                                // led 2 off 
void led_display(int nLedStatus);                               // led control 

/*********************************************************************************************
* name:		led_test
* func:		leds test funciton
* para:		none
* ret:		none
* modify:
* comment:		
*********************************************************************************************/
void led_test()
{
	rPDATF = rPDATF&0xEF;                                       // LED 3 (D1206) on
	delay(1000);

	led1_on();                                                  // LED 1 (D1204) on
	delay(1000);

    rPDATF = rPDATF&0xE7;                                       // LED 4 (D1207) on
	delay(1000);	

	led2_on();                                                  // LED 2 (D1205) on
	delay(1000);
	
	led2_off();                                                 // close LED 2 (D1205) 
	delay(1000);

    rPDATF = rPDATF|0xEF;                                       // close LED 4 (D1207)
	delay(1000);

	led1_off();                                                 // close LED 1 (D1204)
	delay(1000);
	
	rPDATF = rPDATF|0xFF;                                       // close LED 3 (D1206)
	delay(1000);
	
	rPDATF = rPDATF&0xE7; 
    rPDATB = rPDATF&0xCF; 
    delay(1000);
    
    rPDATF = rPDATF|0xFF; 
    rPDATB = rPDATF|0xFF; 
    delay(1000);
    
    rPDATF = rPDATF&0xE7; 
    rPDATB = rPDATF&0xCF; 
    delay(1000);
    
    rPDATF = rPDATF|0xFF; 
    rPDATB = rPDATF|0xFF; 
    delay(1000);
}
/*********************************************************************************************
* name:		led1_on,led1_off
* func:		led 1 light or close 
* para:		none
* ret:		none
* modify:
* comment:		
*********************************************************************************************/
void led1_on()
{
	f_nLedState = f_nLedState | 0x1;
	led_display(f_nLedState);
}

void led1_off()
{
	f_nLedState = f_nLedState&0xfe;
	led_display(f_nLedState);
}

/*********************************************************************************************
* name:		led2_on,led2_off
* func:		led 2 light or close  
* para:		none
* ret:		none
* modify:
* comment:		
*********************************************************************************************/
void led2_on()
{
	f_nLedState = f_nLedState | 0x2;
	led_display(f_nLedState);
}

void led2_off()
{
	f_nLedState = f_nLedState&0xfd;
	led_display(f_nLedState);
}

/*********************************************************************************************
* name:		led_display
* func:		light or close the Led 1,2 
* para:		nLedStatus	-- input, light LED 1,2 according to the nLedStatus' bit[2:1]
*								  nLedStatus' bit[2:1] = 00 : LED 2,1 off
*								  nLedStatus' bit[2:1] = 11 : LED 2,1 on
*								  nLedStatus   = 1 : LED 1 on
*								  nLedStatus   = 2 : LED 2 on
* ret:		none
* modify:
* comment:		
*********************************************************************************************/
void led_display(int nLedStatus)
{
	f_nLedState = nLedStatus;
	
	// change the led's current status
	if((nLedStatus&0x01) == 0x01)
		rPDATB = rPDATB&0x6F;                                   // PB4:LED1 (D1204) on
	else
		rPDATB = rPDATB|(1<<4);                                 // PB4:LED1 (D1204) off

	if((nLedStatus&0x02) == 0x02)
		rPDATB = rPDATB&0x5F;                                   // PB5:LED2 (D1205) on
	else
		rPDATB = rPDATB|(1<<5);                                 // PB5:LED2 (D1205) off
}