i2stest.c

来自「深圳优龙科技LPC2468开发板」· C语言 代码 · 共 54 行

/*****************************************************************************
 *   i2stest.c:  main C entry file for NXP LPC24xx Family Microprocessors
 *
 *   Copyright(C) 2006, NXP Semiconductor
 *   All rights reserved.
 *
 *   History
 *   2006.07.20  ver 1.00    Prelimnary version, first Release
 *
******************************************************************************/
#include "LPC24xx.h"                        /* LPC24xx definitions */
#include "type.h"
#include "i2s.h"
#include "windowsxp.h"

/*******************************************************************************
**   Main Function  main()
*******************************************************************************/
int main (void)
{
    Wave * wave = (Wave *)WindowsXP;
    if(wave->bps != 8 && wave->bps != 16)
    {
    }
    else if ( I2SInit(2-wave->channel,wave->samplerate,wave->bps) == FALSE )	
    {
    }
    else
    {
    	DWORD len = (wave->len - 32) >> 2;
    	DWORD * buf = wave->pdata;
    	int shift = wave->bps == 16;
    	while(len--)
    	{
			while (((I2S_STATE >> 16) & 0xFF) == TXFIFO_FULL);
			
			if(shift)
			{
				unsigned short * sbuf = (unsigned short *)buf;
				DWORD value = (*sbuf + 0x8000) +((sbuf[1]+0x8000)<<16);
				I2S_TX_FIFO = value & 0xFFFEFFFE;
				buf++;
			}
			else 
				I2S_TX_FIFO = *buf++;
		}
    }
	while(1);
}

/******************************************************************************
**                            End Of File
******************************************************************************/