iic.c

三星2413芯片的测试代码,对进行驱动开发很有帮助.

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

    _iicMode = POLLACK;

    while(1)
    {
        rIICDS     = slvAddr;
        _iicStatus = 0x100;             //To check if _iicStatus is changed 
        rIICSTAT   = 0xf0;              //Master Tx, Start, Output Enable, Sucessful, Cleared, Cleared, 0
        rIICCON    = 0xaf;              //Resumes IIC operation. 
        while(_iicStatus==0x100)  
            Run_IicPoll();
              
        if(!(_iicStatus & 0x1))
            break;                      //When ACK is received
    }
    rIICSTAT = 0xd0;                    //Master Tx condition, Stop(Write), Output Enable
    rIICCON  = 0xaf;                    //Resumes IIC operation. 
    Delay(1);                           //Wait until stop condtion is in effect.
      //Write is completed.
}


//************************[ _Rd24C080 ]********************************
void _Rd24C080(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)
        Run_IicPoll();

    _iicMode      = RDDATA;
    _iicPt        = 0;
    _iicDataCount = 1;
    
    rIICDS   = slvAddr;
    rIICSTAT = 0xb0;                    //Master Rx,Start
    rIICCON  = 0xaf;                    //Resumes IIC operation.   
    while(_iicDataCount!=-1)
        Run_IicPoll();

    *data = _iicData[1];
}

//**********************[ Run_IicPoll ]*********************************
void Run_IicPoll(void)
{
    if(rIICCON & 0x10)                  //Tx/Rx Interrupt Enable
       IicPoll();
}       
    
//**********************[IicPoll ]**************************************
void IicPoll(void)
{
    U32 iicSt,i;
    
    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:
			//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;      
    }
}
//##################################################################################
#if 0
void IIC_Write(unsigned char slvAddr, unsigned char addr, unsigned char data);

void Test_Iic_MstrTx(void)
{
	int i=0;
    unsigned int save_E,save_PE;

    save_E   = rGPECON;
    save_PE  = rGPEDN;
    rGPEDN  |= 0xc000;                  //Pull-up disable
    rGPECON |= 0xa0000000;                //GPE15:IICSDA , GPE14:IICSCL 

	while(i<100) {
		if(Uart_GetKey()=='x') break;
		IIC_Write((unsigned char)0xc0,(unsigned char)i,(unsigned char)i);
		printf("%d\n",i++);
		}

rGPEDN	= save_PE;
rGPECON = save_E;

}

//IIC Master Tx
void IIC_Write(unsigned char slvAddr, unsigned char addr, unsigned char data)
{
    	unsigned int iicSt, i;
    	unsigned char _iicData[2];
    	int _iicDataCount, _iicStatus, _iicPt;

        _iicData[0]   = addr;
        _iicData[1]   = data;
        _iicDataCount = 1;
        _iicPt = 0;

	 rIICCON = (1<<7) | (0<<6) | (1<<5) | (0xf);		// Ack Enable,Pclk/16,Interrupt,Prescler
	 rIICADD  = 0xc0;					 //2413 slave address = [7:1]
	 rIICSTAT = 0x10;					 //IIC bus data output enable(Rx/Tx)
	 rIICLC = (1<<2)|(1);				 // Filter enable, 15 clocks SDA output delay		added by junon
 
    	 //Data Write Phase
        rIICDS        = slvAddr; //0xa0
        rIICSTAT      = 0xf0;      // Master Transmit, Start, Serial Output Enable
 
        while(_iicDataCount!=-1)
        {
            if(rIICCON & 0x10)		// Wait for Interrupt pending
            {                  
            
            if((_iicDataCount--)==0)
                    {
                        rIICSTAT = 0xd0;                //stop MasTx condition 
                        rIICCON  = 0xaf;                //resumes IIC operation.
                        Delay(1);                       //wait until stop condtion is in effect.
                            break;    
                    }
        
                    rIICDS = _iicData[_iicPt++];  
                    for(i=0;i<10;i++);      //for setup time until rising edge of IICSCL
                    rIICCON = 0xaf;          //resumes IIC operation.
        }      
        }
     
        rIICSTAT = 0xd0;                //Master Tx condition, Stop(Write), Output Enable
     	 rIICCON  = 0xaf;                //Resumes IIC operation. 
        Delay(1);                           //Wait until stop condtion is in effect.
     //Write is completed.
}
#else


void Test_Iic_MstrTx(void)
{
	int i=0;
    unsigned int save_E,save_PE;
	unsigned char data[100];

    printf("IIC Master Tx Test (Board to Board)\n");
    printf("Connect IIC related signals (IICSCL, IICSDA, and GND) betweem IIC Master TX Board and IIC Slave RX Board.\n");
    printf("First, IIC Slave Board should is ready and then Press any key.\n");
    
    GetIntNum();
    
    
    save_E   = rGPECON;
    save_PE  = rGPEDN;
    rGPEDN  |= 0xc000;                  //Pull-up disable
    rGPECON |= 0xa0000000;                //GPE15:IICSDA , GPE14:IICSCL 

	for(i=0;i<100;i++)
		data[i]=(unsigned char)i;
	
	IIC_Write((unsigned char)0xc0, data);

	rGPEDN	= save_PE;
	rGPECON = save_E;
}

//IIC Master Tx
void IIC_Write(unsigned char slvAddr, unsigned char* data)
{
	unsigned int iicSt, i;

	int _iicDataCount, _iicStatus, _iicPt;
	_iicDataCount = 100;
    _iicPt = 0;

	rIICCON = (1<<7) | (1<<6) | (1<<5) | (0xf);		// Ack Enable,Pclk/16,Interrupt,Prescler
	rIICADD  = 0xc0;					 //2413 slave address = [7:1]
	rIICSTAT = 0xd0;					 //IIC bus data output enable(Rx/Tx)
	rIICLC = (1<<2)|(1);				 // Filter enable, 15 clocks SDA output delay		added by junon
 
    //Data Write Phase
    rIICDS        = slvAddr; //0xa0
    rIICSTAT      = 0xf0;      // Master Transmit, Start, Serial Output Enable
 
    while(_iicDataCount!=-1)
    {
    	if(rIICCON & 0x10)		// Wait for Interrupt pending
        {                  
            
            if((_iicDataCount--)==0)
            {
            	rIICSTAT = 0xd0;                //stop MasTx condition 
                rIICCON  = 0xaf;                //resumes IIC operation.
                Delay(1);                       //wait until stop condtion is in effect.
                break;    
            }
        
                    rIICDS = data[_iicPt++];  
                    for(i=0;i<10;i++);      //for setup time until rising edge of IICSCL
                    rIICCON = 0xaf;          //resumes IIC operation.
        }      
    }
     
    rIICSTAT = 0xd0;                //Master Tx condition, Stop(Write), Output Enable
    rIICCON  = 0xaf;                //Resumes IIC operation. 
    Delay(1);                           //Wait until stop condtion is in effect.

    //Write is completed.
}

#endif

void Test_Iic_SlvRx(void)
{
    unsigned int i,j,save_E,save_PE;
    static U8 data[256];
    static U8 slaveaddr;
    static U8 *slave_addr;
 
    printf("IIC Slave Rx Test...\n");
    

    save_E   = rGPECON;
    save_PE  = rGPEDN;
    rGPEDN  |= 0xc000;                  //Pull-up disable
    rGPECON |= 0xa0000000;                //GPE15:IICSDA , GPE14:IICSCL 

	for(i=0;i<100;i++)
		data[i]=0;

    printf("IIC Slave Rx Test (Board to Board)\n");
    printf("Connect IIC related signals (IICSCL, IICSDA, and GND) betweem IIC Master TX Board and IIC Slave RX Board.\n");
    printf("Waiting for Receiving Data\n");
	IIC_Read(&slaveaddr,data);

	printf("Received Addr.: 0x%x\n",(int)slaveaddr);
	for(i=1;i<100;i++)
     printf("Received Data : 0x%0x\n",(int)data[i]);

    rGPEDN  = save_PE;
    rGPECON = save_E;
}


// Slave Rx
void IIC_Read(unsigned char *slave_addr, unsigned char *Data)
{
    unsigned int iicSt, i;
    unsigned char _iicData[2];
    int _iicDataCount, _iicStatus, _iicPt;

	rIICCON = (1<<7) | (1<<6) | (1<<5) | (0xf);	// Ack Enable,Pclk/16,Interrupt,Prescler
	rIICADD  = 0xc0;					 		//2413 slave address = [7:1]
	rIICSTAT = 0x10;					 		//IIC bus data output enable(Rx/Tx)
	rIICLC = (1<<2)|(1);				 		// Filter enable, 15 clocks SDA output delay, added by junon

	printf("Wait for Slave Addr\n");
	
	while((rIICSTAT&0x4)==0)
	{
	}
	
	i=0;
	
	while(i<100) 
	{
		if(rIICCON&0x10) 
		{
			Data[i]=(U8)rIICDS;
			i++;
			rIICCON = 0xaf;
		}
	}

	*slave_addr=Data[0];

	rIICSTAT=0x0;
   
}