led.c

一个小型的嵌入式操作系统内核,可用于多种硬件平台

/**************************************************************************************************
                                      EDL RTOS Kernel
                              (c) Copyright 2005, Wu Jun
                                    All Rights Reserved    
                For further information, please visit http://www.enjoydigitallife.com

* Description:      None
* History:          
    Date                         Remarks
    2005-01-06                   Created initial version
    2005-12-12                   Finished the version 2.01
**************************************************************************************************/


#include "datatype.h"
#include "LPC2294.h"
#include "led.h"




/**************************************************************************************************
* Description: Initialize
**************************************************************************************************/
void led_init(void)
{

    PINSEL0 = 0x00000000;		/* set pin connect to GPIO */
    IO0DIR = SPI_IOCON | 0x05 ;			/* set SPI with output */
   
}





/**************************************************************************************************
* Description:      show the 8-bit data in LED indicator.     
* Parametters:      c       the 8-bit data to be displayed in led indicator. e.g. if c = 0x01, then
                            the LED indicator will be lit as 00000001. 
**************************************************************************************************/
void  led_dispChar(U8 c)
{  
    U8 data = ~c;
    U8 i;
    IO0CLR = SPI_CS;			    /* SPI_CS = 0 */
    for(i = 0; i < 8; i++)			
    {  
        IO0CLR = SPI_CLK;			/* SPI_CLK = 0 */

        if(( data & 0x01 ) != 0 ) 
        {
            IO0SET = SPI_DATA;
        }
        else
        {
            IO0CLR = SPI_DATA;
        }
        data >>= 1;
        IO0SET = SPI_CLK;			/* SPI_CLK = 1 */
    }
   IO0SET = SPI_CS;			    /* SPI_CS = 1, output the data to be displayed */
}


/**************************************************************************************************
* Description:      delay
* Parametters:      times       specifies the cycle number
**************************************************************************************************/
void  led_delay(U32 times)
{  
    U32 i;
    for(i = 0; i < times; i++)			
    {  
        /* we do nothing here, just loop */
    }
}