iic.c

基于dm643的Fir 滤波器的设计

/************************************************************
  Copyright (C), 2007 by SEED Electronic Technology LTD.
  FileName: IIC.C
  Author:  Ya.X      Version : V1.0         Date:2007-09-20
  Description:   IIC模块原文件，包括IIC读写操作
*************************************************************/
#include <csl.h>
#include <csl_i2c.h>
#include "IIC.h"

/*I2C发送寄存器配置结构体*/
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接收寄存器配置结构体*/	
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  */
};

/*************************************************************
  Function:       I2C_write16
  Description:    通过IIC写16bit的数据到AIC23寄存器，配置AIC23
  Calls:          No
  Called By:      main
  Input:          hI2C: I2C句柄
				  regnum:需要配置的寄存器
				  regval:待写入的寄存器值
  Output:         No
  Return:         True:成功 ; False:失败
  Others:         No
**************************************************************/
Uint16 I2C_write16(I2C_Handle hI2C, Uint8 regnum, Uint8 regval)
{
	Uint8 tempdata = 0;
		
	//Waiting for Bit12 of ICSTR ie. BB (Bus Busy) to clear
    while(I2C_bb(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
    while(I2C_bb(hI2C));
    
    DEC643_waitusec(400);
    return TRUE;
}

/*************************************************************
  Function:       I2C_read16
  Description:    通过IIC读取寄存器的值
  Calls:          No
  Called By:      main
  Input:          hI2C: I2C句柄
				  regnum:需要配置的寄存器
				  regval:待写入的寄存器值
  Output:         No
  Return:         True:成功 ; False:失败
  Others:         No
**************************************************************/
Uint16 I2C_read16(I2C_Handle hI2C, Uint8 regnum, Uint8 regval)
{
	Uint8 tempdata = 0;
     
	//Waiting for Bit12 of ICSTR ie. BB (Bus Busy) to clear
    while(I2C_bb(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
    while(I2C_bb(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
    while(I2C_bb(hI2C));
    
    return TRUE;
}
/********************************************************************************/
/* End of IIC.C */
/********************************************************************************/