iis.c

embest下开发的audio音频设备驱动

/* 	iis operation
	written by ZhangBo 2008-5
*/

#include "2410lib.h"
#include "audio.h"

#define LEN 0xf0000
int intsymbol = 0;
extern const UINT8T g_ucWave[155760];
/* init iis device */ 

void init_iis(void)
{
	/*GPB4 GPB3 GPB2 as output */
	rGPBCON = rGPBCON |(1<<8)|(1<<6)|(1<<4);
	/*GPB2 GPB3 GPB4 pullup function are disabled */
	rGPBUP = rGPBUP | (7<<2);
	/*GPE4    GPE3    GPE2 	  GPE1 	    GPE0 as follows */
	/*I2SSDO  I2SSDI  CDCLK   I2SSCLK   I2SLRCLK */
	rGPECON = rGPECON |(2<<8)|(2<<6)|(2<<4)|(2<<2)|2;
	/* GPE0-GPE4 pull up disabled */
	rGPEUP = rGPEUP | 0x1f;
	
	intsymbol = 0;
	init_1341(0);    /*0 for play mode, 1 for record mode */
	
}

/* close iis device */

void close_iis(void)
{
	rIISCON  = 0x0;								// IIS stop
    rIISFCON = 0x0;								// For FIFO flush
	rINTMSK |= BIT_DMA2;
}

/* play audio */

void audio_play(UINT8T* dat,int length)
{
	int i;
	ClearPending(BIT_DMA2);
	rINTMOD = 0x0;
	
	init_1341(0); 		//play audio mode
	
	pISR_DMA2 = (unsigned)dma_operation;
	rINTMSK &= ~(BIT_DMA2);
	
	intsymbol = 0;
	rDISRCC2 = 0x0;
	rDISRC2 = (INT32T)dat;
	rDIDSTC2 = 0x3;
	rDIDST2 = (INT32T)IISFIFO;
	rDCON2 = (1<<31)+(0<<30)+(1<<29)+(0<<28)+(0<<27)+(0<<24)+(1<<23)+(0<<22)+(1<<20) + length/2;
	rDMASKTRIG2 = (0<<2)+(1<<1)+0; 
	rIISCON = (1<<5)+(0<<4)+(0<<3)+(1<<2)+(1<<1);
	rIISMOD = (0<<8)|(2<<6)|(0<<5)|(0<<4)|(1<<3)|(1<<2)|(1<<0);
	rIISPSR = (2<<5)|(2<<0);
	rIISFCON = (1<<15)|(1<<13);
	rIISCON |= 0x1;
	while(intsymbol == 0)
		;
	rINTMSK |= BIT_DMA2;
	rIISCON = 0x0;
	
}

/* record audio */

void audio_record(void)
{
	UINT8T* buff;
	int length;
	int i;
	/* enable interrupt */
	
	ClearPending(BIT_DMA2);						
	rINTMOD=0x0;
	
	uart_printf("Record audio begin:\n");
	buff = (unsigned char*)0x30200000;
	for( i = (UINT32T)buff; i <((UINT32T)buff+LEN+0x20000); i+=4)
	{
		*((volatile unsigned int*)i)=0x0;  
	}
	
	/* record mode */
	init_1341(1);
	
	intsymbol = 0;
	pISR_DMA2 = (unsigned)dma_operation;
	rINTMSK &= ~(BIT_DMA2);
	rDISRCC2 = 0x2;
	rDISRC2 = (INT32T)IISFIFO;
	rDIDSTC2 = 0x0;
	rDIDST2 = (INT32T)buff;
	rDCON2 = (1<<31)+(0<<30)+(1<<29)+(0<<28)+(0<<27)+(0<<24)+(1<<23)+(1<<22)+(1<<20) + LEN/2;
	rDMASKTRIG2 = (0<<2)+(1<<1)+0; 
	
	rIISCON = (0<<5)+(1<<4)+(1<<3)+(0<<2)+(1<<1);
	rIISMOD = (0<<8)|(1<<6)|(0<<5)|(0<<4)|(1<<3)|(1<<2)|(1<<0);
	rIISPSR = (2<<5)|(2<<0);
	rIISFCON = (1<<14)|(1<<12);
	rIISCON |= 0x1;
	uart_printf("Press any key to end! \n");
	while(intsymbol == 0)
	{
		if(uart_getkey())
			break;
	}
	
	rINTMSK |= BIT_DMA2;
	rIISCON = 0x0;
	delay(20);
	
	uart_printf(" End record!!!\n");
    uart_printf(" Press any key to play record data!!!\n");
    while(!uart_getkey());

	/* play the audio */
	
	audio_play(buff, LEN);
    	    
    rINTMSK |= BIT_DMA2;
    rIISCON = 0x0;    						
    uart_printf(" Play end!!!\n");
}

/* dma interrupt */
void dma_operation(void)
{
	ClearPending(BIT_DMA2);						
    intsymbol = 1;
}

void test(void)
{
	
	uart_printf("\n IIS test begin\n");
    init_iis();							
    uart_printf(" record and play\n");
    memcpy((void *)0x30200000, g_ucWave, 155956);
  	audio_play((UINT8T *)0x30200000,155956);  
//    audio_record();
	uart_printf(" end.\n");
    close_iis();		
}