lib_lpc_ad.c

使用embest IDE开发工具开发的基于LPC2294 的触摸屏开发

/*
***********************************************************************

       Embest Info&Tech Co., Ltd.  All rights reserved.
                     www.embedinfo.com

***********************************************************************

---------------- file information -------------------------------------

file name: lib_lpc_ad.c
version  : v0
author   : zhangxuquan
           peter pan / [e-mail]
                       [e-mail]
begin    : 2006-02-10
finish   : 2006-02-10
define   : lpc ad convert lib

notes    :

---------------- modify information -----------------------------------
version  :
modify   :
begin    :
finish   :
define   :
-----------------------------------------------------------------------
*/

/*-------------------------------------------------------------------*/
/*                       include files                               */
/*---------------------------------------------------------------- --*/
#include    "lib_lpc_ad.h"


/*-------------------------------------------------------------------*/
/*                       function code                               */
/*-------------------------------------------------------------------*/


/**********************************************************************
* name  :    port_toad_en
* func  :    connect the port to ad part
* para  :    channel
* ret   :

* glob  :    xxxx
* inc   :

* author:
* date  :

* modify:
* comment:
**********************************************************************/
void  port_toad_en(AD_channel AD_channel_v)
      {
       INT32U i,j,k;
       switch (AD_channel_v)
              {
               case AIN0:
                          break;
               case AIN1:
                          break;
               case AIN2:
                          break;
               case AIN3:
                          break;
               case AIN4:
                          //AIN4/5
                          i=PINSEL2;
                          i &= ~P2_30_31_AIN_4_5_PINSEL2_M;
                          i |= P2_30_31_AIN_4_5_PINSEL2_V;
                          PINSEL2 = i;
                          //EN 4
                          i=PINSEL2;
                          i &= ~P2_30_AIN_4_PINSEL2_M;
                          i |= P2_30_AIN_4_PINSEL2_V;
                          i=PINSEL2;

                          break;
               case AIN5:
                          //AIN4/5
                          i=PINSEL2;
                          i &= ~P2_30_31_AIN_4_5_PINSEL2_M;
                          i |= P2_30_31_AIN_4_5_PINSEL2_V;
                          PINSEL2 = i;
                          //EN 5
                          i=PINSEL2;
                          i &= ~P2_31_AIN_5_PINSEL2_M;
                          i |= P2_31_AIN_5_PINSEL2_V;
                          i=PINSEL2;

                          break;
               case AIN6:
                          //AIN4/5
                          i=PINSEL2;
                          i &= ~P2_30_31_AIN_4_5_PINSEL2_M;
                          i |= P2_30_31_AIN_4_5_PINSEL2_V;
                          PINSEL2 = i;
                          //EN6
                          i=PINSEL2;
                          i &= ~P3_29_AIN_6_PINSEL2_M;
                          i |= P3_29_AIN_6_PINSEL2_V;
                          i=PINSEL2;

                          break;
               case AIN7:
                          //AIN4/5
                          i=PINSEL2;
                          i &= ~P2_30_31_AIN_4_5_PINSEL2_M;
                          i |= P2_30_31_AIN_4_5_PINSEL2_V;
                          PINSEL2 = i;
                          //EN7
                          i=PINSEL2;
                          i &= ~P3_28_AIN_7_PINSEL2_M;
                          i |= P3_28_AIN_7_PINSEL2_V;
                          i=PINSEL2;

                          break;

               default:   break;
              }
      }

/*
             AIN0=0,
             AIN1
             AIN2
             AIN3
             AIN4,
             AIN5,
             AIN6,
             AIN7
*/

/**********************************************************************
* name  :    AD_init
* func  :    Initialize the AD change channel,include select AD change
             mode (soft/auto), selecting channel.if under auto mode,
             select trigger mode for starting change.
* para  :    Chg_mode: 0 auto  1 soft ,AD_channel,AD_trigger_mode.
* ret   :    xxxx

* glob  :    xxxx
* inc   :

* author:
* date  :

* modify:
* comment:
**********************************************************************/
void AD_init(INT8U Chg_mode,AD_channel ad_ch,AD_trigger_mode tri_mode,INT8U edge)
     {
      INT32U i;
      INT32U ain_sel;

      //set pinsel to ad convert
      port_toad_en(ad_ch);

      switch (ad_ch)
             {
              case AIN0:
                                break;
              case AIN1:
                                break;
              case AIN2:
                                break;
              case AIN3:
                                break;    
              case AIN4:        ain_sel=SEL_AIN4;
                                break;
              case AIN5:        ain_sel=SEL_AIN5;
                                break;
              case AIN6:        ain_sel=SEL_AIN6;
                                break;
              case AIN7:        ain_sel=SEL_AIN7;
                                break;
              default:
                                break;
             }
      if(Chg_mode==0)
        {
         i=ain_sel+CLKDIV+BURST_A+CLKS_0+PDN_N+TEST_0+START_A;
         ADCR=i;
        }
      else
        {
        }
     }


/**********************************************************************
* name  :    AD_read
* func  :    get the ad convort data
* para  :    Chg_mode: 0 auto  1 soft ,AD_channel,AD_trigger_mode.
* ret   :    data of INT32U types

* glob  :    xxxx
* inc   :

* author:
* date  :

* modify:
* comment:
**********************************************************************/
INT32U AD_read(void)
{
    INT32U data;
    while((ADDR&0x80000000)==0);
    data=ADDR;
    data=((data&DATA_MASK)>>6);
    return data;
}


/**********************************************************************
* name  :    AD_close
* func  :    close the ad convert
* para  :
* ret   :

* glob  :    xxxx
* inc   :

* author:
* date  :

* modify:
* comment:
**********************************************************************/
void AD_close()
{
    INT32U i;
    i=SEL_DEFAULT;
    ADCR=i;
}