iic.c

c6000DSP中

/********************************************************************************\
\*IIC.C	V1.00
* Copyright	2003 by SEED Electronic Technology Ltd.
* All rights reserved. Property of SEED Electronic Technology Ltd.			                
* Designed by:	Hongshuai.Li								                                
*********************************************************************************/ 

#include <csl.h>
#include <csl_i2c.h>
#include <DEC643.h>
#include <IIC.h>
/********************************************************************************/
/* Set I2C registers. */
	I2C_Config MyI2CCfgT = {
    0,  /* master mode,  i2coar;采用主模式   */
    0,  /* no interrupt, i2cimr;只写，不读，采用无中断方式*/
    (20-5), /* scl low time, i2cclkl;  */
    (20-5), /* scl high time,i2cclkh;  */
    2,  /* configure later, i2ccnt;*/
    0x1A,  /* configure later, i2csar;*/
    0x4620, /* master tx mode,     */
            /* i2c runs free,      */
            /* 8-bit data + NACK   */
            /* no repeat mode      */
    (75-1), /* 2MHz clock, i2cpsc  */
};
	
	I2C_Config MyI2CCfgR = {
    0,  /* master mode,  i2coar;采用主模式   */
    0,  /* no interrupt, i2cimr;只写，不读，采用无中断方式*/
    (20-5), /* scl low time, i2cclkl;  */
    (20-5), /* scl high time,i2cclkh;  */
    1,  /* configure later, i2ccnt;*/
    0x1A,  /* configure later, i2csar;*/
    0x4420, /* master tx mode,     */
            /* i2c runs free,      */
            /* 8-bit data + NACK   */
            /* no repeat mode      */
    (75-1), /* 2MHz clock, i2cpsc  */
};	

/********************************************************************************/
/********************************************************************************\
\*I2C_write16()		-Write 16bits data to AIC23 registers. Configure AIC23 control
					register. 
\*Parameters:	hI2C. I2C id.
				regnum. The related register.
				regval. Register value to be written.
\*Return:	True or False. 
\********************************************************************************/
Uint16 I2C_write16(I2C_Handle hI2C,Uint8 regnum,Uint8 regval)
{
	Uint8 tempdata = 0;
		
	//Waiting for Bit12 of ICSTR ie. BB (Bus Busy) to clear
    waitForBusFree(hI2C);
    
	/* Configure I2C. */
	I2C_config(hI2C,&MyI2CCfgT);
	//Write the low data into Data Transmit register
    tempdata = regnum;
    I2C_writeByte(hI2C, tempdata&0xFF); 
    
    //To invoke the start condition
    I2C_start(hI2C);
    
    /* Wait until MSB transmit is done */
    while(!I2C_xrdy(hI2C));
    
    //Write the high data into Data Transmit register.
    tempdata = regval;
    I2C_writeByte(hI2C, tempdata&0xFF); 
    //Generate Stop condition
    I2C_sendStop(hI2C);
    
    //Waiting for Bit12 of ICSTR ie. BB (Bus Busy) to clear
    waitForBusFree(hI2C);
    
    DEC643_waitusec(400);
    return TRUE;

}
/********************************************************************************/
/********************************************************************************\
\*I2C_read16()		-Write 16bits data to AIC23 registers. Configure AIC23 control
					register. 
\*Parameters:	hI2C. I2C id.
				regnum. The related register.
				regval. Register value to be written.
\*Return:	True or False. 
\********************************************************************************/
Uint16 I2C_read16(I2C_Handle hI2C,Uint8 regnum,Uint8 regval)
{
	Uint8 tempdata = 0;
    
    /* Send address. */
   
	//Waiting for Bit12 of ICSTR ie. BB (Bus Busy) to clear
    waitForBusFree(hI2C);
    
	I2C_config(hI2C,&MyI2CCfgT);
	//Write the low data into Data Transmit register
    tempdata = regnum;
    I2C_writeByte(hI2C, tempdata&0xFF); 
    
    //To invoke the start condition
    I2C_start(hI2C);
    
    /* Wait until MSB transmit is done */
    while(!I2C_xrdy(hI2C));
    
    //Write the high data into Data Transmit register.
    tempdata = regval;
    I2C_writeByte(hI2C, tempdata&0xFF);
    
    /* Generate Stop condition */
    I2C_sendStop(hI2C);
    
    //Waiting for Bit12 of ICSTR ie. BB (Bus Busy) to clear
    waitForBusFree(hI2C);
    
    /* Wait for the time from transmit to receive. */
    DEC643_waitusec(10);
    
     /* Receive data. */
    I2C_config(hI2C,&MyI2CCfgR);
    
    /* Generate start condition, starts transmission */
    I2C_start(hI2C);
    while(I2C_FGETH(hI2C,I2CSTR,ARDY));
    /* Wait until MSB transmit is done */
    while(!I2C_rrdy(hI2C));

    /* Submit the MSB for transmit */
    regval = I2C_RGETH(hI2C, I2CDRR);
        
    /* Generate stop condition */
    I2C_sendStop(hI2C); 
     
    //Waiting for Bit12 of ICSTR ie. BB (Bus Busy) to clear
    waitForBusFree(hI2C);
    
    return TRUE;

}
/********************************************************************************/
//This function waits until the I2C bus busy bit is reset
waitForBusFree(I2C_Handle hI2C)
{
	//Waiting for Bit12 of ICSTR ie. BB (Bus Busy) to clear
	while(I2C_bb(hI2C));
}


//This function waits till the I2C bus busy bit gets set
waitForBusBusy(I2C_Handle hI2C)
{
	//Waiting for Bit12 of ICSTR ie. BB (Bus Busy) to set
	while(!I2C_bb(hI2C));
} 
/********************************************************************************/