iis.c

基于2410的一个iis总线测试程序 声音控制芯片是飞利浦的UTS1341 可通过xmodem发送声音文件（WAV）到内存

//=================================
//File name: iis.c
//Discription:provide some iis test method use by the main.c file
//Author: Decell.Zhou
//version
//=================================

#include "iis.h"

//this variable indicate the 1341 mute state,"0" stands for unmute,"1" stands for mute
static char gMute;
//the boolean variable indicate the  if DMA transfer has been complete
static char gbDMAStop;
//the variable indicate the current completed tranfer size
static unsigned long gCompletedSize;
//the file size we need to transfer via DMA
static unsigned long gDMACounter;

//===================================================================
void iisWriteL3Addr(unsigned char data)
{       
    char i,j;
	
	//Uart_Printf("Addr: 0x%x\n",data);
	
    //then generate the set-up signal,for address transmit mode 
    rGPBDAT =rGPBDAT & (~(L3M|L3C|L3D)) | (L3C) ;//L3CLK=1,L3DAT=0,L3MOD =0
    for(j=0;j<4;j++);//tsu(L3)A = 190ns,1/135M = 7ns, 7cycles for one loop,
    				 //49ns/loop,4 loops for 190ns
    
    //in L3 bus we send bit 0 first 
    for(i=0;i<8;i++)                   
    {
        if(data & 0x1)//if the bit is 1
        {
            rGPBDAT &= ~(L3C);//the first half of the cycle
            rGPBDAT |= L3D;//L3D=H,because the bit is 1             
            
            for(j=0;j<4;j++);//tcy(L3)/2 = 250ns
            
            rGPBDAT |= L3C;//the second half of the cycle
            rGPBDAT |= L3D;//L3D=H,because the bit is 1
            
            for(j=0;j<4;j++);//tcy(L3)/2 = 250ns
        }
        else//if the bit is 0
        {
            rGPBDAT &= ~L3C;//the first half of the cycle
            rGPBDAT &= ~L3D;//L3D=L,because the bit is 0
            
            for(j=0;j<4;j++);//tcy(L3)/2 = 250ns
            
            rGPBDAT |= L3C;//the second half of the cycle
            rGPBDAT &= ~L3D;//L3D=L,because the bit is 0
            
            for(j=0;j<4;j++);//tcy(L3)/2 = 250ns            
        }
        data >>= 1;
    }
    rGPBDAT = rGPBDAT & (~(L3D|L3M|L3C)) | (L3C|L3M);//stop the address mode  
}

//===================================================================
void iisWriteL3Data(unsigned char data)
{
    char i,j;
    
    //Uart_Printf("Addr: 0x%x\n",data);
	
	//first generate the halt signal,that is tstp(L3)
    rGPBDAT  = rGPBDAT & (~(L3D | L3M | L3C)) | (L3C);//L3M and L3D is "0" while L3C is "1"     
    for(j=0;j<4;j++);//tstp(L3)=190ns
    
	//then generate the set-up signal,for data transmit mode
    rGPBDAT  = rGPBDAT & (~(L3D | L3M | L3C)) | (L3C | L3M);//L3M and L3C is "1" while L3D is "0"    
    for(j=0;j<4;j++);//tsu(L3)D=190ns

    //we send bit0 first in L3 bus
    for(i=0;i<8;i++)
    {
        if(data & 0x1)//if the data bit is "1"
        {  
           //the first half of the cycle
           rGPBDAT &= ~L3C;//L3C="0"
           rGPBDAT |= L3D;//L3D="1"
           for(j=0;j<4;j++);//tcy(L3)/2=250ns
           
           //the second half of the cycle
           rGPBDAT |= L3C;//L3C="1" 
           rGPBDAT |= L3D;//L3D="1"
           for(j=0;j<4;j++);//tcy(L3)/2=250ns
        }
        else//if the data bit is "0"
        {
           //the first half of the cycle
           rGPBDAT &= ~L3C;//L3C="0"
           rGPBDAT &= ~L3D;//L3D="0"
           for(j=0;j<4;j++);//tcy(L3)/2=250ns
           
           //the first half of the cycle
           rGPBDAT |= L3C;//L3C="1"
           rGPBDAT &= ~L3D;//L3D="0"
           for(j=0;j<4;j++);//tcy(L3)/2=250ns
        }
        data >>= 1;
    }
    rGPBDAT  = rGPBDAT & ~(L3D | L3M | L3C) | (L3C | L3M);//stop the data mode
}


//===========[iisEint0ISR]==========
//Discription:the isr for the eint0,make the 1341 into  mute state
//Author:Decell.Zhou
//Version:
//parm:
//return:
//==================================
static void __irq iisEint0ISR(void){

	rSRCPND = (0x1 << 0);//clear pending bit
	rINTPND = (0x1 << 0);
	
	rINTMSK |= (0x1 << 0);//disable the interrupt 
	
	if(gMute == 0){//we are going to mute state
		gMute =1;
		iisWriteL3Addr(0x14);//enter data0 mode
		iisWriteL3Data(0xa4);//10,1,00,1,00:data0, direct addressing ,after the tone features,no de-emphasis,mute,flat
		Uart_SendString("----mute----\n");
	}else{
		gMute = 0;
		iisWriteL3Addr(0x14);//enter data0 mode
		iisWriteL3Data(0xa0);//10,1,00,0,00:data0, direct addressing ,after the tone features,no de-emphasis, no mute,flat
		Uart_SendString("---- no mute----\n");
	}
	
	for(;(rSRCPND & (0x1 << 0)) == 1;){
		rSRCPND = (0x1 << 0);//clear pending bit
	}
	rINTMSK &= ~(0x1 << 0);//enable the interrupt  
	
}

//===========[iisDMA2PlayISR]========
//Dicription:the isr for DMA when 1341 is in the play mode
//Author:Decell.Zhou
//Version:
//parm:none
//return:none
//===================================
static void __irq iisDMA2PlayISR(void){
	
	rINTMSK |= (0x1 << 19);
	rSRCPND |= (0x1 << 19);
	rINTPND |= (0x1 << 19);
	gCompletedSize += 0x10000;
	if(gCompletedSize >= gDMACounter){
		gbDMAStop = 1;//stop the DMA transfer
		gCompletedSize = 0;
	}else{
		rINTMSK &= ~(0x1 << 19);
	}
	
	Uart_Printf("DMA count: 0x%x\n",rDSTAT2 & 0xfffff);
	Uart_SendString("DMA INT!...\n");
	rGPFDAT |= ((0x1 << 7)|(0x1 << 4));//set the out put the high, turn off the LED

}


//===========[iisDMA2RecordISR]========
//Dicription:the isr for DMA when 1341 is in the record mode
//Author:Decell.Zhou
//Version:
//parm:none
//return:none
//===================================
static void __irq iisDMA2RecordISR(void){}


//===========[iisInitPort]==========
//Discription: initial the GPE for the iis function,GPB for L3,GPF for eint
//Author:Decell.Zhou
//Version:
//parm:none
//return:none
//==================================
void iisInitPort(void){
	//set GPB2,GPB3,GPB4 as L3MOD,L3DATA,L3CLOCK
	rGPBCON |=((0x2 << 8)|(0x2 << 6)|(0x2 << 4));
	//disable GPB2-GPB3 pull-up resistor
	rGPBUP |= (0x1 << 4)|(0x1 << 3)|(0x1 << 2);
	//Start condition : L3M=H, L3C=H
	rGPBDAT = rGPBDAT & ~(L3M|L3C|L3D) |(L3M|L3C); 
	
	//set GPE0,GPE1,GPE2,GPE3,GPE4 as I2SLRCLK,I2SSCLK,I2SCDCLK,I2SSDI,I2SSDO  
	rGPECON |=((0x2 << 0)|(0x2 << 2)|(0x2 << 4)|(0x2 << 6)|(0x2 << 8));
	//disable the pull-up resistor for the GPE0-GPE4
	rGPEUP |= (0x1 << 0)|(0x1 << 1)|(0x1 << 2)|(0x1 << 3)|(0x1 << 4);
	
	//set GPF0 as EINT0
	rGPFCON |= (0x2 << 0);
	//disable the pull-up resistor for GPF0
	rGPFUP |= (0x1 << 0);

}

//===========[iis1341SetMode]===========
//Discription: set up the UDA1341 work mode accroding to the argument
//Author:Decell.Zhou
//Version:
//parm:
//		0|char|play mode
//		1|char|record mode
//return:none
//======================================
void iis1341SetMode(char argMode){
	
	char i;
	
	int j;
	
    rGPBDAT = rGPBDAT & ~(L3M|L3C|L3D) |(L3M|L3C); //Start condition : L3M=H, L3C=H
    rGPBUP  = rGPBUP  & ~(0x7<<2) |(0x7<<2);       //The pull up function is disabled GPB[4:2] 1 1100    
    rGPBCON = rGPBCON & ~(0x3f<<4) |(0x15<<4);     //GPB[4:2]=Output(L3CLOCK):Output(L3DATA):Output(L3MODE)

	
	//Start condition : L3M=H, L3C=H
	//rGPBDAT = rGPBDAT & ~(L3M|L3C|L3D) |(L3M|L3C); 
	//for(j = 0;j<1000;j++);
	
	
	if(argMode == PLAY_MODE){//for play mode
		
		iisWriteL3Addr(0x16);// enter STATUS mode (00010100+10)
    	iisWriteL3Data(0x60);//0,1,10,000,0:Reset,256fs,no DCfilter,iis format
   		
   		iisWriteL3Addr(0x16);//enter STATUS (00010100+10)
    	iisWriteL3Data(0x20);//0,0,10,000,0:No reset,256fs,no DCfilter,iis format
    
    	iisWriteL3Addr(0x16);//enter STATUS (00010100+10)
    	iisWriteL3Data(0x81);//1,0,0,0,0,0,01:OGS=0,IGS=0,ADC_NI,DAC_NI,single speed,ADC off,DAC on
    	
    	Uart_SendString("1341 init play...!\n");
    
    
	}else{//for recoed mode
		
		iisWriteL3Addr(0x16);// enter STATUS mode (00010100+10)
    	iisWriteL3Data(0x60);//0,1,10,000,0:Reset,256fs,no DCfilter,iis format   		
   		
   		iisWriteL3Addr(0x16);//enter STATUS (00010100+10)
    	iisWriteL3Data(0x20);//0,0,10,000,0:No reset,256fs,no DCfilter,iis format
    	
    	iisWriteL3Addr(0x16);//enter STATUS (00010100+10)
    	iisWriteL3Data(0xa2);//1,0,0,0,0,0,10:OGS=0,IGS=1,ADC_NI,DAC_NI,single speed,ADC on,DAC off
    	
        iisWriteL3Addr(0x14);//enter DATA0 (00010100+00)
        iisWriteL3Data(0xc2); //11000,010: DATA0, Extended addressing,extended address=010
        iisWriteL3Data(0xed);//111,011,01 : DATA0,Extended data, Mic Sensitivity =9dB, Ch1=on Ch2=off, 
		
		Uart_SendString("1341 init record...!\n");
	
	}
}

//===========[iisInitDMA]============
//Discription:init the DMA setting,then start the DMA operation
//Author:Decell.Zhou