S3C2440-IIS放音
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完成音频文件的播放。IISFIFO为16位宽，深度为32。将音频数组中的数据装入IISFIFO，装满后IIS读取IISFIFO中的数据，即放音，然后再将音频数组中的数据读入IISFIFO，周而复始，完成放音。
#include "2440addr.h"
#include "music.h"
#define L3MODE 1＜＜2
#define L3DATA 1＜＜3
#define L3CLOCK 1＜＜4
void WriteL3(unsigned char data, unsigned int mode){
//mode = 0,地址模式;mode = 1,数据传输模式
int i, k;
if(mode == 0){
rGPBDAT = rGPBDAT & "(L3MODE|L3DATA|L3CLOCK )|L3CLOCK;
}
else{
rGPBDAT = rGPBDAT & "(L3MODE|L3DATA|L3CLOCK)|(L3CLOCK|L3MODE);
}
for(k = 0; k ＜ 5; k++)
;
for(i = 0; i ＜ 8; i++){
if(data & 0x1){
rGPBDAT &= "L3CLOCK;
rGPBDAT |= L3DATA;
for(k = 0; k ＜ 5; k++)
;
rGPBDAT |= L3CLOCK;
rGPBDAT |= L3DATA;
for(k = 0; k ＜ 5; k++)
;
}
else{
rGPBDAT &= "L3CLOCK;
rGPBDAT &= "L3DATA;
for(k = 0; k ＜ 5; k++)
;
rGPBDAT |= L3CLOCK;
rGPBDAT &= "L3DATA;
for(k = 0; k ＜ 5; k++)
;
}
data ＞＞= 1;
}
rGPBDAT = rGPBDAT & "(L3MODE|L3DATA|L3CLOCK)|(L3CLOCK|L3MODE);
}
void PlayMusic(unsigned char buffer[], unsigned int length){
int i, fifo;
//UDA1341
//STATUS模式
rGPBDAT = rGPBDAT & "(L3MODE|L3DATA|L3CLOCK)|(L3CLOCK|L3MODE);
WriteL3(0x14+2,0);
//复位
WriteL3(0x60,1);
WriteL3(0x14+2,0);
//00010000 系统时钟频率384fs
WriteL3(0x10,1);
WriteL3(0x14+2,0);
//11000001 输出增益，ADC关，DAC开
WriteL3(0xc1,1);
//IIS
//DMA禁止,在接受空闲状态，不产生IISLRCK信号，IIS预分频使能
rIISCON = (0＜＜5)|(0＜＜4)|(0＜＜3)|(1＜＜2)|(1＜＜1);
//主设备时钟PCLK，主设备模式，发送模式，串行数据16位，主时钟是384fs，串行位时钟32fs
rIISMOD = (0＜＜9)|(0＜＜8)|(2＜＜6)|(0＜＜5)|(0＜＜4)|(1＜＜3)|(1＜＜2)|(1＜＜0);
//预分频都是N=3
rIISPSR = (3＜＜5)|3;
//发送FIFO正常，发送FIFO使能
rIISFCON = (0＜＜15)|(1＜＜13);
//IIS start
rIISCON |= 0x1;
for(fifo = 0; fifo ＜= length; fifo += 64){
while(rIISCON &(1＜＜7));
for(i = 0; i ＜ 32; i++)
rIISFIFO = (buffer[i*2+fifo]) + (buffer[i*2+1+fifo]＜＜8);
}
//IIS close
rIISCON = 0x0;
}
int Main(){
rGPBUP= rGPBUP& "(0x7＜＜2) | (0x7＜＜2); //The pull up function is disabled GPB[4:2] 1 1100
rGPBCON = rGPBCON & "(0x3f＜＜4) | (0x15＜＜4); //GPB[4:2]=Output(L3CLOCK):Output(L3DATA):Output(L3MODE)
rGPBDAT = 0x1ec;
rGPEUP= rGPEUP& "(0x1f)| 0x1f; //The pull up function is disabled GPE[4:0] 1 1111
rGPECON = rGPECON & "(0x3ff) | 0x2aa; //GPE[4:0]=I2SSDO:I2SSDI:CDCLK:I2SSCLK:I2SLRCK
rMPLLCON = (150＜＜12)|(5＜＜4)|(0＜＜0);
PlayMusic(music, sizeof(music));
while(1);
return 0;
}
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