iis.c

基于nucleus操作系统的GPRS无线数据传输终端全套源文件。包括支持ARM7的BSP,操作系统

/*********************************************************************** 
 * $Workfile:   iis.c  $ 
 * $Revision: 1.1.1.1 $ 
 * $Author: meterchen $ 
 * $Date: 2003/11/10 17:01:07 $ 
 * 
 * Project:     Shenzhen-Nucleus-Net
 * 
 * Description: 
 *    IIS driver
 *
 * Revision History: 
 * 
 *********************************************************************** 
 * 
 *  Copyright (c) 2003 CHENMENG
 * 
 *  All rights reserved 
 * 
 **********************************************************************/

#include "44b.h"
#include "44blib.h"
#include "def.h"
#include "iis.h"

/*
 * Use BDMA for iis data transfer
 * one-shot
 *
 */
void Iis_Tx(void)
{
    unsigned short *txdata;

    /*
     * Init IIS port
     *
     */
     
    rIISCON = 0;
    rBDICNT0 = 0;
    
    rPCONE &= ~(3<<16);
    rPCONE |= 0x2<<16;	//gpe8~codeclk
    rPUPE |= 1<<8;
    
    rPCONF &= ~(0x7<<19);
    rPCONF |= 0x4<<19;	//gpf8~iisclk
    
    rPCONF &= ~(0x7<<13);
    rPCONF |= 0x4<<13;	//gpf6~iisdo
    
    rPCONF &= ~(0x7<<10);
    rPCONF |= 0x4<<10;	//gpf5~iislrck
    
    rPUPF |= (1<<5)|(1<<6)|(1<<8);
  
	
	/* txdata in flash and make it noncachable */
	txdata=(unsigned short *)0x100000;
    rNCACHBE1= ((int)txdata>>12) + ( (((int)txdata>>12) +0x100)<<16 );
	
	/* IIS Initialize */
    rIISCON=0x22;	//Tx DMA enable,Rx idle,prescaler enable
    rIISMOD=0x89;	//Master,Tx,L-ch=low,iis,16bit ch.,codeclk=256fs,lrck=32fs
    rIISPSR=0x33;	//Prescaler_A/B enable, value=8
    rIISFCON=0xa00;	//Tx/Rx DMA,Tx/Rx FIFO --> start piling....
    
    /* BDMA0 Initialize */
    rBDISRC0=(1<<30)+(1<<28)+(int)(txdata);	//Half word,inc,Buf
    rBDIDES0=(1<<30)+(3<<28)+((int)IISFIF);	//M2IO,fix,IISFIF
    rBDICNT0=(1<<30)+(1<<26)+(3<<22)+(0<<21)+(0<<20)+0x68000; //iis,reserved,end_int,1_tx,DMA enable,COUNT
    rBDICNT0 |= (1<<20);//enable  
    rBDCON0 = 0x0<<2;
  
    /* Tx start */
    rIISCON |=0x1;
}