rGPBDAT &= ~L3C; //L3C=L
rGPBDAT &= ~L3D; //L3D=L
for(j=0;j<5;j++)
; //等待一段时间
rGPBDAT |= L3C; //L3C=H
rGPBDAT &= ~L3D; //L3D=L
for(j=0;j<5;j++)
; //等待一段时间
}
data >>= 1;
}
rGPBDAT = rGPBDAT & ~(L3D | L3M | L3C) | (L3C | L3M); //L3M=H,L3C=H
}
//放音
void playsound(unsigned char *buffer, int length)
{
int count,i;
char flag;
rGPBDAT = rGPBDAT & ~(L3M|L3C|L3D) |(L3M|L3C); //L3开始传输：L3M=H, L3C=H
//配置UDA1341
WriteL3(0x14 + 2,1); //状态模式(000101xx+10)
WriteL3(0x60,0); //0,1,10, 000,0 : 状态0,复位
WriteL3(0x14 + 2,1); //状态模式 (000101xx+10)
WriteL3(0x10,0); //0,0,01, 000,0 : 状态0, 384fs,IIS,no DC-filtering
WriteL3(0x14 + 2,1); //状态模式 (000101xx+10)
WriteL3(0xc1,0); //1,0,0,0, 0,0,01:状态1,
//Gain of DAC 6 dB,Gain of ADC 0dB,ADC non-inverting,
//DAC non-inverting,Single speed playback,ADC-Off DAC-On
//配置s3c2440的IIS寄存器
//预分频器为3，所以CDCLK=PCLK/(3+1)=16.928kHz
rIISPSR = 3<<5|3;
//无效DMA，输入空闲，预分频器有效
rIISCON = (0<<5)|(0<<4)|(0<<3)|(1<<2)|(1<<1);
//PCLK为时钟源，输出模式，IIS模式，每个声道16位，CODECLK=384fs，SCLK=32fs
rIISMOD = (0<<9)|(0<<8)|(2<<6)|(0<<5)|(0<<4)|(1<<3)|(1<<2)|(1<<0);
rIISFCON = (0<<15)|(1<<13); //输出FIFO正常模式，输出FIFO使能
flag=1;
count=0;
//开启IIS
rIISCON |= 0x1;
while(flag)
{
if((rIISCON & (1<<7))==0) //检查输出FIFO是否为空
{
//FIFO中的数据为16位，深度为32
//当输出FIFO为空时，一次性向FIFO写入32个16位数据
for(i=0;i<32;i++)
{
rIISFIFO=(buffer[2*i+count])+(buffer[2*i+1+count]<<8);
}
count+=64;
if(count>length)
flag=0; //音频数据传输完，则退出
}
}
rIISCON = 0x0; //关闭IIS
}
void Main(void)
{
//配置MPLL
//fs=44.1kHz,CODECLK=384fs=16.9344MHz
//不改变CLKDIVN，所以PCLK=FCLK/8
//MPLLCON:MDIV=150,PDIV=5,SDIV=0，所以FCLK=541.7143MHz,PCLK=67.714MHz
rMPLLCON = (150<<12) | (5<<4) | 0;
//配置L3接口总线，GPB2:L3MODE, GPB3:L3DATA, GPB4:L3CLOCK
rGPBCON = 0x015550; //输出
rGPBUP = 0x7ff; //上拉无效
rGPBDAT = 0x1e4;
//配置IIS接口
rGPEUP = rGPEUP & ~(0x1f) | 0x1f; //上拉无效，GPE[4:0] 1 1111
rGPECON = rGPECON & ~(0x3ff) | 0x2aa;
playsound(music,sizeof(music));
while(1)
{
;
}
}