iic.c

来自「这是一个用Ｔ108加上瑞萨公司Ｒ8Ｃ2Ａ做的一个ＯＳＤ显示。希望能帮上大家。」· C语言 代码 · 共 501 行

C
501 行
字号 
/***************************************************************************
Project  :  Car two ting dvd System
Compiler :  ST7 HiCross C (HiWARE)
Module   :  autos.c 
Version  :  V 1.0
Created  :  24 11, 2005
Author   :  tomi / SA
Description
         -  I2c.  
Modified
		 - tomi
***************************************************************************/
#include "r8c2a.h"

#include "tw803_regs.h"
#include "IIC.h"
#include "OSD2_define.h"


void StartCondition(void);
void StopCondition(void);
void I2Cm_nAck(void);
void I2Cm_Ack(void);
unsigned char Send_Byte(unsigned char cData);
unsigned char Read_Byte(void);
unsigned char I2CReadByte(unsigned char cDevAddr, unsigned char cReg);
unsigned char I2CReadByte_no_sub(unsigned char cDevAddr);
unsigned char I2CWriteByte(unsigned char cDevAddr, unsigned char cReg, unsigned char cData);
unsigned char I2CReadBytes(unsigned char cDevAddr, unsigned char cReg, unsigned char *pString,char unsigned cNum);
unsigned char I2CWriteByte_noAddrsss(unsigned char cDevAddr,unsigned char cData);
unsigned char I2CWrite_nBytes(unsigned char cDevAddr,unsigned char *buff,unsigned char num);
void twdDelay(unsigned short wLoops);

void OSDCfgWr(unsigned char  index,unsigned char dat);
void OSD1SetRamData(unsigned int wdata);
void OSDSetRamAddr(unsigned int address);

void OSD2CfgWr(unsigned char index,unsigned char dat);
void OSD2SetRamAddr(unsigned int address);
void OSD2SetRamData(unsigned int wdata);
unsigned char twdWr_Burst_A(unsigned char cReg);
void twdWr_Burst_D(unsigned char cData);
void twdWr_Burst_P(void);
void OSDSetRamDataBuest(unsigned int wdata);	

/**********************************************************
Function:I2c start command
**********************************************************/
void StartCondition(void)
{
    unsigned char ix;
    unsigned char cTWtrytime=0;
    while(++cTWtrytime)
    {

        Set_SDA_High;
        Set_SCL_High;        /* make sure two line is release */
        for(ix = 0; ix < TWD_LONG_TIME; ix++)
        { };  /* Delay 12us */

        Set_SDA_Low;
        for(ix = 0; ix < TWD_LONG_TIME; ix++)
        { };  /* Delay 12us */

        if((SCL_High)&&(SDA_Low))
            break;
    }

    for(ix = 0; ix < TWD_SHORT_TIME; ix++)
    { };  /* Delay 12us */
}
/**********************************************************
Function:I2c stop command
**********************************************************/
void StopCondition(void)
{
    unsigned char ix;
   	unsigned char cTWtrytime=0;

    Set_SDA_Low;
    Set_SCL_High;
    for(ix = 0; ix < TWD_SHORT_TIME; ix++)
    { };  /* delay 12us */

    while(SCL_Low && ++cTWtrytime)
    { };

    for(ix = 0; ix < TWD_SHORT_TIME; ix++)
    { };  /* delay 12us */

    Set_SDA_High;
    for(ix = 0; ix < TWD_SHORT_TIME; ix++)
    { };  /* delay 12us */
}
/**********************************************************
Function:I2c send one byte to the slower
**********************************************************/
unsigned char Send_Byte(unsigned char cData)
{
    unsigned char ix, j, cAcknowledge;
    unsigned char cTWtrytime=0;

    cAcknowledge = 0;

    for(ix = 0; ix < 8; ix++)
    {
        Set_SCL_Low;
        
        if(cData&0x80)Set_SDA_High;
		else Set_SDA_Low;
		cData<<=1;

        for(j = 0; j < TWD_SHORT_TIME; j++)
        { };

        Set_SCL_High;
        while(SCL_Low && ++cTWtrytime)
        { };

        for(j = 0; j < TWD_SHORT_TIME; j++)
        { };
    }
    for(j = 0; j < TWD_SHORT_TIME; j++)
    { };

    Set_SCL_Low;
	SET_SDA_AS_INPUT;	
    for(j = 0; j < TWD_SHORT_TIME; j++)
    { };


	for(j = 0; j < TWD_SHORT_TIME; j++)
    { };
	
    Set_SCL_High;                /* Send a clock for Acknowledge */
    while(SCL_Low)
    { };
    for(j = 0; j < TWD_SHORT_TIME; j++)
    

    if(SDA_High) 
       cAcknowledge = 1; /* No Acknowledge */
   Set_SCL_Low;                   /* Finish Acknoledge */

    SET_SDA_AS_OUTPUT;	/*This is tomi new adding,because the ST IO not same as the 8051*/

    return(cAcknowledge);
}
/**************************************************************
Function:Read a byte from slower with a acknowledge bit
**************************************************************/
unsigned char Read_Byte(void)
{
    unsigned char ix, j;
    unsigned char cRetval=0;
	SET_SDA_AS_INPUT;	/*This is tomi new adding,because the ST IO not same as the 8051*/
	for(j=0;j<TWD_SHORT_TIME;j++)
		{};
	
    for(ix=0;ix<8;ix++){
          Set_SCL_High;
          while(SCL_Low){};
          for(j=0;j<TWD_SHORT_TIME;j++){};
          cRetval = (SDA_High)? (cRetval|(1<<(7-ix))):cRetval ;  /* MSB First */
	  Set_SCL_Low;
     }
    return cRetval;
}
/*-----------------------------------------------------------------------------
ROUTINE NAME : I2Cm_Ack
INPUT/OUTPUT : None.
DESCRIPTION  : Acknoledge generation from now.
COMMENTS     : Transfer sequence = DATA, ACK.
-----------------------------------------------------------------------------*/ 
void I2Cm_Ack (void)
{
 unsigned char j;
     SET_SDA_AS_OUTPUT;
  	 Set_SDA_Low;
	 
     Set_SCL_High;
     while(SCL_Low){};
     for(j = 0; j < TWD_SHORT_TIME; j++)
     { };

    Set_SCL_Low;
    
	/*This is tomi new adding,because the ST IO not same as the 8051*/
	for(j = 0; j < TWD_SHORT_TIME; j++)
     { };
	
    Set_SDA_High;
    for(j = 0; j < TWD_SHORT_TIME; j++)
    { };
} 

/*-----------------------------------------------------------------------------
ROUTINE NAME : I2Cm_nAck
INPUT/OUTPUT : None.
DESCRIPTION  : Non acknoledge generation from now.
COMMENTS     : Transfer sequence = DATA, NACK.
-----------------------------------------------------------------------------*/ 
void I2Cm_nAck (void)
{
	unsigned char j;
    SET_SDA_AS_OUTPUT;
   
     	Set_SDA_High;

       Set_SCL_High;
     while(SCL_Low){};
     for(j = 0; j < TWD_SHORT_TIME; j++)
     { };

    Set_SCL_Low;
    
	/*This is tomi new adding,because the ST IO not same as the 8051*/
	for(j = 0; j < TWD_SHORT_TIME; j++)
     { };
	
    Set_SDA_High;
    for(j = 0; j < TWD_SHORT_TIME; j++)
    { };
}
/*******************************************************************
Function:Maker read one byte from the slower's appointed address
*******************************************************************/
unsigned char I2CReadByte(unsigned char cDevAddr, unsigned char cReg)
{
    unsigned char cResult = 0;

	/* write reg offset */
    StartCondition();
    if(Send_Byte(cDevAddr))
	return 0;  // Write address
    if(Send_Byte(cReg))
	return 0;

    /* read data */
    StartCondition();
    if (Send_Byte(cDevAddr | 0x01)) // Read address
	return 0;
    cResult = Read_Byte();
     I2Cm_Ack();
    StopCondition();
    return cResult;
}
/*******************************************************************
Function:
*******************************************************************/
unsigned char I2CReadByte_no_sub(unsigned char cDevAddr)
{
	unsigned char cResult = 0;
	/* write reg offset */
    StartCondition();
    if(Send_Byte(cDevAddr))
	return 0;  // Write address

	/* read data */
    StartCondition();
    if (Send_Byte(cDevAddr | 0x01)) // Read address
	return 0;
    cResult = Read_Byte();
    I2Cm_Ack();	
  
    StopCondition();
    return cResult;
}
/*******************************************************************
Function:Maker send one byte to the slower's appointed address
*******************************************************************/
unsigned char I2CWriteByte(unsigned char cDevAddr, unsigned char cReg, unsigned char cData)
{
	/* start condition */
    StartCondition();
  	cDevAddr &= 0xFE;   // Force WRITE address
    /* send device ID and write data */
    if(!Send_Byte(cDevAddr))
    {
        if(!Send_Byte(cReg))
        {
            if(!Send_Byte(cData))
            {
                StopCondition();
                return(0);      /* success */
            }
        }
    }
    StopCondition();
    return(1);
}
/*********************************************************************
Function:Read more than one byte from the slower to the appointed address
*********************************************************************/
unsigned char I2CReadBytes(unsigned char cDevAddr, unsigned char cReg, unsigned char *pString,char unsigned cNum)
{
	/* write reg offset */
	StartCondition();
  if(Send_Byte(cDevAddr))
		return 0;  // Write address
  if(Send_Byte(cReg))
		return 0;

	/* read data */
  StartCondition();
  if (Send_Byte(cDevAddr | 0x01)) // Read address
		return 0;
	while(cNum)
  {
  	*pString++ = Read_Byte();  
	  if(cNum==1)
	     I2Cm_nAck();
      else
	     I2Cm_Ack;
		 
		cNum--;
	}

 	StopCondition();
  return 1;
}
/*********************************************************************
Function:Send one byte to the slower no the appointed address
*********************************************************************/
unsigned char I2CWriteByte_noAddrsss(unsigned char cDevAddr,unsigned char cData)
{
	/* start condition */
    StartCondition();
  	cDevAddr &= 0xFE;   // Force WRITE address
    /* send device ID and write data */
    if(!Send_Byte(cDevAddr))
    {
		if(!Send_Byte(cData))
        {
        	StopCondition();
            return(0);      /* success */
        }
    }
    StopCondition();
    return(1);
	
}
/****************************************************************
Function:I2c write n bytes
****************************************************************/
unsigned char I2CWrite_nBytes(unsigned char cDevAddr,unsigned char *buff,unsigned char num)
{
	unsigned char i;
	unsigned char Ack;
	/* start condition */
    StartCondition();
	cDevAddr &= 0xFE;   // Force WRITE address
    /* send device ID and write data */
    Ack = Send_Byte(cDevAddr);
    if(!Ack)
    	{
		for (i=0; i<num; i++)
		{
			if (!Ack)
			Ack = Send_Byte (*buff++);
		}
		StopCondition();
        return(0);      /* success */
    	}
	StopCondition();
    return(1);
}
/***********************************************************
Function:I2C write have sub address and write n bytes
***********************************************************/
unsigned char I2C_write_sub(unsigned char cDevAddr,unsigned char sub_addr,unsigned char *buff,unsigned char num)
{
	unsigned char i;
	unsigned char Ack;
	/* start condition */
    StartCondition();
	cDevAddr &= 0xFE;   // Force WRITE address
    /* send device ID and write data */
    Ack = Send_Byte(cDevAddr);
    if(!Ack)
    	Ack = Send_Byte(sub_addr);
    if(!Ack)
    	{
		for (i=0; i<num; i++)
		{
			if (!Ack)
			Ack = Send_Byte (*buff++);
		}
		StopCondition();
        return(0);      /* success */
    	}
	StopCondition();
    return(1);
}
////////////////////////////////////////////////////////////////////////////

void twdDelay(unsigned short wLoops)
{
	unsigned short wTemp;

    while (wLoops--) {
	    wTemp = 1000/6;	// one loop below takes about 11 us
        while (wTemp--);
    }
}
 
///////////////////////////////////////////////////////////////////////// 
 
void OSDCfgWr(unsigned char  index,unsigned char dat)
{
 I2CWriteByte(TW803_P0,OSD_CFG_INDEX,index);
 I2CWriteByte(TW803_P0,OSD_CFG_DATA,dat);
}
/////////////////////////////////////////////////////////////////////////

void OSDSetRamAddr(unsigned int address)
{
	
  	I2CWriteByte(TW803_P0,OSD_RAM_AL,(unsigned char)(address & 0xff));  
	I2CWriteByte(TW803_P0,OSD_RAM_AH,(unsigned char)(address>>8));
}
///////////////////////////////////////////////////////////////////////////

void OSD1SetRamData(unsigned int wdata)
{
	I2CWriteByte(TW803_P0,OSD_RAM_DL,(unsigned char)(wdata & 0xff));
  	I2CWriteByte(TW803_P0,OSD_RAM_DH,(unsigned char)(wdata>>8));
} 
///////////////////////////////////////////////////////////////////////////

void OSD2CfgWr(unsigned char index,unsigned char dat)
{
	I2CWriteByte(TW803_P0,OSD2_CFG_INDEX,index);
	I2CWriteByte(TW803_P0,OSD2_CFG_DATA,dat);
}
///////////////////////////////////////////////////////////////////////////

void OSD2SetRamAddr(unsigned int address)
{
	I2CWriteByte(TW803_P0,OSD2_RAM_AL,(unsigned char)(address & 0xff));
  	I2CWriteByte(TW803_P0,OSD2_RAM_AH,(unsigned char)(address>>8));

}
//////////////////////////////////////////////////////////////////////////////

void OSD2SetRamData(unsigned int wdata)
{
	I2CWriteByte(TW803_P0,OSD2_RAM_DL,(unsigned char)(wdata & 0xff));		
  	I2CWriteByte(TW803_P0,OSD2_RAM_DH,(unsigned char)(wdata>>8));
	
}
/////////////////////////////////////////////////////////////////////////////

unsigned char twdWr_Burst_A(unsigned char cReg)
{
    StartCondition();
    if(!Send_Byte(TW803_P0))
    {
        if(!Send_Byte(cReg))
        {
            return(0);               //
        }
    }
    return(1);                  //
}
//////////////////////////////////////////////////////////////////////////////

void twdWr_Burst_D(unsigned char cData)
{
    unsigned char ix;

    for(ix = 0; ix < 8; ix++)
    {
        Set_SCL_Low;
        if(cData&0x80)Set_SDA_High;
		else Set_SDA_Low;
		cData<<=1;
        Set_SCL_High;
    }
    Set_SCL_Low;
    Set_SDA_High;                /* release data line for acknowledge */
    Set_SCL_High;                /* Send a clock for Acknowledge */
//    if(SDA_High) cAcknowledge = 1; /* No Acknowledge */
    Set_SCL_Low;                   /* Finish Acknoledge */

//    return(cAcknowledge);
}
//////////////////////////////////////////////////////////////////////////

void twdWr_Burst_P(void)
{
    StopCondition();
}


void OSDSetRamDataBuest(unsigned int wdata)			//add for new version
{
	twdWr_Burst_D((unsigned int)(wdata & 0xff));
	twdWr_Burst_D((unsigned int)(wdata>>8));		 	
}

iic.c - 源码说明

本页面展示了「这是一个用Ｔ108加上瑞萨公司Ｒ8Ｃ2Ａ做的一个ＯＳＤ显示。希望能帮上大家。」中的 iic.c 源码文件，采用 C语言 编程语言编写，共 501 行代码。您可以在线阅读完整代码内容，也可以返回资源详情页下载完整源码包进行本地学习和开发。

虫虫下载站收录了大量与108相关的技术资源，包括源代码、技术文档、电路图等，是电子工程师和嵌入式开发者的专业学习平台。

⌨️ 快捷键说明

复制代码Ctrl + C
搜索代码Ctrl + F
全屏模式F11
增大字号Ctrl + =
减小字号Ctrl + -
显示快捷键?