I2c测试

czw19911010 · 发表于 2015-8-26 08:37:16

主函数
#include <string.h>
#include <stdio.h>
#include "Target\44blib.h"
#include "Target\Def.h"
#include "Target\44b.h"
#include "iictest\iic.h"

/********************************************/
// ARMSYS实验十一：IIC接口应用测试（AT24C04)
// 描述：读写IIC接口EEPROM
/********************************************/
void * function[][2]=
{
(void *)Test_Iic,          "IIC(AT24LCxx) ",
0,0
};

void Isr_Init(void)
{
rINTCON=0x5;       //Non-vectored,IRQ enable,FIQ disable //
rINTMOD=0x0;       //All=IRQ mode//
rINTMSK=~(BIT_EINT0 | BIT_GLOBAL);
}

void Main(void)
{
char aa;
int i;

Port_Init();
Uart_Init(0,115200);
Isr_Init();//it's needed.
Led_Display(0xf);
Delay(0);
Beep(0x1);

Uart_Select(0); //Select UART0//
Uart_Printf("\n\n*************************************************************************");
Beep(0x0);
Uart_Printf("\n*                            立泰电子                                  *");
Uart_Printf("\n*                   -S3C44B0X功能部件:IIC测试-                      *");
Uart_Printf("\n*                         Version 1.11                               *");
Uart_Printf("\n*                   Email:rao_dali@263.net                         *");
Uart_Printf("\n*          UART Config--COM:115.2kbps,8Bit,NP,UART0                *");
Uart_Printf("\n*------------------Begin to Start IIC test,OK? (Y/N)--------------------*");

Led_Display(0x0);
aa= Uart_Getch();
if((aa=='Y')||(aa=='y'))
while(1)
{
         i=0;
         Uart_Printf("\n");
         while(1)
         { //display menu
            Uart_Printf("%2d:%s",i+1,function[1]);
            i++;
            if((int)(function[0])==0)
            {
                  Uart_Printf("\n");
                  break;
            }
            if((i%4)==0)
                  Uart_Printf("\n");
         }
         Uart_Printf("\nSelect the function to test?");
         i=Uart_GetIntNum();
         i--;
         Uart_Printf("\n");
         if(i>=0 && (i<(sizeof(function)/8)) )
            ( (void (*)(void)) (function[0]) )();
}
}

#include <string.h>
#include "..\Target\44b.h"
#include "..\Target\44blib.h"
#include "..\Target\def.h"
#include "iic.h"

#define WRDATA       (1)
#define POLLACK    (2)
#define RDDATA       (3)
#define SETRDADDR (4)

#define IICBUFSIZE 0x20

U8 _iicData[IICBUFSIZE];
volatile int _iicDataCount;
volatile int _iicStatus;
volatile int _iicMode;
int _iicPt;

void __irq IicInt(void);

void Test_Iic(void)
{
unsigned int i,j,save_F,save_PF;
static U8 data[256];

Uart_Printf("[IIC Test using AT24LCxx]\n");

save_F=rPCONF;
save_PF=rPUPF;
rPCONF |=0xa; //PF0:IICSCL, PF1:IICSDA
rPUPF |=0x3; //pull-up disable

pISR_IIC=(unsigned)IicInt;
rINTMSK=~(BIT_GLOBAL|BIT_IIC);

rIICCON=(1<<7)|(0<<6)|(1<<5)|(0xf);
//Enable interrupt, IICCLK=MCLK/16, Enable ACK
//40Mhz/16/(15+1) = 257Khz
rIICADD=0x10; // S3C44B0X slave address

rIICSTAT=0x10;

Uart_Printf("Write test data into AT24LCxx\n");

for(i=0;i<256;i++)
Wr24LCxx(0xa0,(U8)i,i);
for(i=0;i<256;i++)
data=0;

Uart_Printf("Read test data from AT24LCxx\n");
for(i=0;i<256;i++)
Rd24LCxx(0xa0,(U8)i,&(data));

for(i=0;i<16;i++)
{
for(j=0;j<16;j++)
      Uart_Printf("%2x ",data[i*16+j]);
Uart_Printf("\n");
}

rPCONF=save_F;
rPUPF=save_PF;
}

void Wr24LCxx(U32 slvAddr,U32 addr,U8 data)
{
_iicMode=WRDATA;
_iicPt=0;
_iicData[0]=(U8)addr;
_iicData[1]=data;
_iicDataCount=2;

rIICDS=slvAddr;//0xa0
rIICSTAT=0xf0; //MasTx,Start
//Clearing the pending bit isn't needed because the pending bit has been cleared.
while(_iicDataCount!=-1);

_iicMode=POLLACK;

while(1)
{
rIICDS=slvAddr;
_iicStatus=0x100;
rIICSTAT=0xf0; //MasTx,Start
rIICCON=0xaf;  //resumes IIC operation.
while(_iicStatus==0x100);
if(!(_iicStatus&0x1))
      break; // when ACK is received
}
rIICSTAT=0xd0;  //stop MasTx condition
rIICCON=0xaf; //resumes IIC operation.
Delay(1);       //wait until stop condtion is in effect.

//write is completed.
}

void Rd24LCxx(U32 slvAddr,U32 addr,U8 *data)
{
_iicMode=SETRDADDR;
_iicPt=0;
_iicData[0]=(U8)addr;
_iicDataCount=1;

rIICDS=slvAddr;
rIICSTAT=0xf0; //MasTx,Start
//Clearing the pending bit isn't needed because the pending bit has been cleared.
while(_iicDataCount!=-1);

_iicMode=RDDATA;

_iicPt=0;
_iicDataCount=1;

rIICDS=slvAddr;
rIICSTAT=0xb0; //MasRx,Start
rIICCON=0xaf;  //resumes IIC operation.
while(_iicDataCount!=-1);

*data=_iicData[1];
}

void __irq IicInt(void)
{
U32 iicSt,i;
rI_ISPC=BIT_IIC;

iicSt=rIICSTAT;
if(iicSt&0x8){} // when bus arbitration is failed.
if(iicSt&0x4){} // when a slave address is matched with IICADD
if(iicSt&0x2){} // when a slave address is 0000000b
if(iicSt&0x1){} // when ACK isn't received

switch(_iicMode)
{
case POLLACK:
      _iicStatus=iicSt;
      break;

case RDDATA:
      if((_iicDataCount--)==0)
      {
      _iicData[_iicPt++]=rIICDS;

      rIICSTAT=0x90;  //stop MasRx condition
      rIICCON=0xaf; //resumes IIC operation.
      Delay(1); //wait until stop condtion is in effect.
            //too long time...
      //The pending bit will not be set after issuing stop condition.
      break;
      }
      _iicData[_iicPt++]=rIICDS;
            //The last data has to be read with no ack.
      if((_iicDataCount)==0)
      rIICCON=0x2f; //resumes IIC operation with NOACK.
      else
      rIICCON=0xaf; //resumes IIC operation with ACK
      break;

case WRDATA:
      if((_iicDataCount--)==0)
      {
      rIICSTAT=0xd0; //stop MasTx condition
      rIICCON=0xaf; //resumes IIC operation.
      Delay(1); //wait until stop condtion is in effect.
      //The pending bit will not be set after issuing stop condition.
      break;
      }
      rIICDS=_iicData[_iicPt++];  //_iicData[0] has dummy.
      for(i=0;i<10;i++);       //for setup time until rising edge of IICSCL
      rIICCON=0xaf;       //resumes IIC operation.
      break;

case SETRDADDR:
      //Uart_Printf("[S%d]",_iicDataCount);
      if((_iicDataCount--)==0)
      {
      break;  //IIC operation is stopped because of IICCON[4]
      }
      rIICDS=_iicData[_iicPt++];
      for(i=0;i<10;i++);  //for setup time until rising edge of IICSCL
      rIICCON=0xaf;       //resumes IIC operation.
      break;

default:
      break;
}
}