main.c

这是周立功开发板上的实验程序,这是周立功开发板上的实验程序

/****************************************Copyright (c)**************************************************
**                               Guangzou ZLG-MCU Development Co.,LTD.
**                                      graduate school
**                                 http://www.zlgmcu.com
**
**--------------File Info-------------------------------------------------------------------------------
** File name:			main.c
** Last modified Date:  2004-09-16
** Last Version:		1.0
** Descriptions:		The main() function example template
**
**------------------------------------------------------------------------------------------------------
** Created by:			litiantian
** Created date:		2007-03-19
** Version:				1.0
** Descriptions:		I2S WAV播放
**------------------------------------------------------------------------------------------------------
** Modified by:			Caiqinglong
** Modified date:		2007-09-03
** Version:
** Descriptions:		对代码风格和注释进行规范、校对。
**
** Rechecked by:        Litiantian
********************************************************************************************************/
#include "config.h"

extern	  uint8		WaveData[];			// WAV文件的声音数据,该WAV的音频特征:采样率22KHz、16位数据、立体声

volatile  uint32	Snd_End;			// 为1时,表明WAV文件已经播放完毕
volatile  uint32 	I2SSndPt;			// WAV声音数据指针

/*      UDA1341控制脚定义       */
#define   L3MODE        	(1 << 27) 	// 为0时,使能ADDRESS模式;为1时,使能数据传输模式
#define   L3DATA        	(1 << 29) 	
#define   L3CLOCK       	(1 << 19) 	

/* 	        I2S相关宏       	*/
#define	  WORDWIDTH_MASK	0x3
#define	  TRACKNSEL_MASK	0x4
#define   WSHALF_MASK		0x00007ec0
#define	  WSHALFPERIOD  	0x0f
#define   IIS_INT			31
#define	  I2SSNDIRQ_EN()		(I2SIRQ |= 0x02)
#define   I2SSNDIRQ_DISABLE()	(I2SIRQ &= ~0x02)
#define	  WaitUntilSndEND()		while (((I2SSTATE >> 16) & 0xFF) != 0)	
#define	  I2SSNDIRQ_ON	    	((I2SSTATE & 0x01) == 0x01)
#define	  SNDTHELAST			(I2SSndPt  > WAVFILESIZ - 4)
#define   I2SOUT_STOP()			(I2SDAO |= (0x01 << 3) | (0x01 << 4))
#define   MusicStartPos		45

/*  预先完成I2S初始化参数的计算  */
#define	  SAMPLERATE        22000
#define   BIT_N				16
#define	  CHANNEL_N			2
#define	  I2SBITRATE		(SAMPLERATE * BIT_N * CHANNEL_N)
#define   I2STXRATE_VAL		(Fpclk / I2SBITRATE - 1)

	     
/* 声音文件大小 */
#define	  WAVFILESIZ		119384

/*   静音控制   */
#define	  MUTE_OFF()		WrL3Addr(0x14);WrL3Data(0x80)
#define	  MUTE_ON()			WrL3Addr(0x14);WrL3Data(0x84)

/* 声音大小控制 */
#define	  LOUD				0x0
#define	  SOFT				0x0f
#define   DUMB				0x3f

/*********************************************************************************************************
** 函数名称 ：I2SIRQISR
** 函数功能 ：发送中断
** 入口参数 ：无
** 出口参数 ：无
**********************************************************************************************************/
void __irq I2SIRQISR(void) 
{
  	volatile uint32 WavDat = 0;
  	volatile uint32 LastDatToSnd_N = 0;
  	
  	if (I2SSNDIRQ_ON)						
	{
		if (SNDTHELAST)
		{
			LastDatToSnd_N = WAVFILESIZ - I2SSndPt;
		
			switch (LastDatToSnd_N)
			{
				case 1:
					WavDat    = WaveData[I2SSndPt];
					I2STXFIFO = WavDat;			 			
					I2SSndPt += 1;
					break;
				case 2:
					WavDat    = (WaveData[I2SSndPt] << 8 ) 
								| (WaveData[I2SSndPt + 1]);
					I2STXFIFO = WavDat;			 			
					I2SSndPt += 1;
					break;
				case 3:
					WavDat    = (WaveData[I2SSndPt + 2] << 24) 
								| (WaveData[I2SSndPt]   << 8 ) 
								| (WaveData[I2SSndPt + 1]);
					I2STXFIFO = WavDat;			 			
					I2SSndPt += 2;
					break;
				default:
					break;
			}
			Snd_End = 1;
			WaitUntilSndEND();
			I2SSNDIRQ_DISABLE();
			VICVectAddr = 0;								
			return;
		}
		else
		{
			WavDat 	  =   (WaveData[I2SSndPt + 2] << 24) 
						| (WaveData[I2SSndPt + 3] << 16) 
						| (WaveData[I2SSndPt]     << 8 ) 
						| (WaveData[I2SSndPt + 1]);
			I2STXFIFO = WavDat;			 					
			I2SSndPt += 4;
		}
	}
	I2SSNDIRQ_DISABLE();							// 需以禁止IRQ发送中断的方式返回
    VICVectAddr = 0;										
}

/*********************************************************************************************************
** 函数名称 ：I2SInit
** 函数功能 ：初始化I2S接口
** 入口参数 ：无
** 出口参数 ：无
**********************************************************************************************************/
void I2SInit(void) 
{
	uint32 DAOValue = 0;

	PCONP  |= (1 << 27);	  						// 在PCONP中使能I2S接口

	/* 初始化P0.6-P0.9、P0.23、P0.24为I2S接口引脚 */
	PINSEL0 = 0x00055000;
	PINSEL1 = 0x00028000;
	
	/* I2S接口的位速率,也就是I2S的串行时钟I2S_BitRate = 采样率Sample rate * 声音的通道数 CHn * 所产生声音数据的位数BITn */
	I2STXRATE = I2STXRATE_VAL;						// I2S接口的发送位速率I2S_BitSndRate = Fpclk / (TXRATE + 1)

	/*   设置音频输出通道的工作模式   */
	I2SDAO &= ~WORDWIDTH_MASK;						// 配置数据宽度
	I2SDAO |= 0x01;									// 0x00:数据字宽度8位;0x01:宽度16位;0x02:保留;0x03:32位
	
	I2SDAO &= ~TRACKNSEL_MASK;						// 配置声道模式
	I2SDAO |= 0x00; 								// 0x04:单声道；0x0:立体声							
	
	I2SDAO &= ~WSHALF_MASK;
	I2SDAO |= WSHALFPERIOD << 6;					// 分频值WSHALFPERIOD可从0到511