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S3C2440-DMA

作者： 時(shí)間：2016-12-02 來(lái)源：網(wǎng)絡(luò) 收藏
void PlayMusic(unsigned char buffer[], unsigned int length){
result = (length＞＞1)/0x100000;
remain = (length＞＞1)&0xfffff;
//UDA1341
//STATUS模式
rGPBDAT = rGPBDAT & "(L3MODE|L3DATA|L3CLOCK)|(L3CLOCK|L3MODE);
WriteL3(0x14+2,0);
//復(fù)位
WriteL3(0x60,1);
WriteL3(0x14+2,0);
//00010000 系統(tǒng)時(shí)鐘頻率384fs
WriteL3(0x10,1);
WriteL3(0x14+2,0);
//11000001 輸出增益，ADC關(guān)，DAC開(kāi)
WriteL3(0xc1,1);
//IIS
//DMA開(kāi)啟,在接受空閑狀態(tài)，不產(chǎn)生IISLRCK信號(hào)，IIS預(yù)分頻使能
rIISCON = (1＜＜5)|(0＜＜4)|(0＜＜3)|(1＜＜2)|(1＜＜1);
//主設(shè)備時(shí)鐘PCLK，主設(shè)備模式，發(fā)送模式，串行數(shù)據(jù)16位，主時(shí)鐘是384fs，串行位時(shí)鐘32fs
rIISMOD = (0＜＜9)|(0＜＜8)|(2＜＜6)|(0＜＜5)|(0＜＜4)|(1＜＜3)|(1＜＜2)|(1＜＜0);
//預(yù)分頻都是N=3
rIISPSR = (3＜＜5)|3;
//發(fā)送FIFO用DMA模式，發(fā)送FIFO使能
rIISFCON = (1＜＜15)|(1＜＜13);
//DMA
rDISRC2 = (U32)buffer; //DMA2初始源地址
rDISRCC2 = (0＜＜1)|(0＜＜0); //源在系統(tǒng)總線上，地址增加
rDIDST2 = (U32)IISFIFO; //DMA2初始目的地址
rDIDSTC2 = (0＜＜2)|(1＜＜1)|(1＜＜0); //當(dāng)TC為0時(shí)，中斷發(fā)生，源在外圍總線上，地址固定，一直為IISFIFO的0x55000010（小端）
if(result == 0){
flag = 0;
//握手模式，與APB時(shí)鐘同步，當(dāng)所有的傳輸結(jié)束，中斷請(qǐng)求生成，單元傳送，單服務(wù)模式，當(dāng)傳輸計(jì)數(shù)器為0時(shí)，DMA通道關(guān)閉
rDCON2 = (1＜＜31)|(0＜＜30)|(1＜＜29)|(0＜＜28)|(0＜＜27)|(0＜＜24)|(1＜＜23)|(1＜＜22)|(1＜＜20)|(remain＜＜0);
}
else{
flag = 1;
rDCON2 = (1＜＜31)|(0＜＜30)|(1＜＜29)|(0＜＜28)|(0＜＜27)|(0＜＜24)|(1＜＜23)|(1＜＜22)|(1＜＜20)|(0xfffff＜＜0);
}
rDMASKTRIG2 = (0＜＜2)|(1＜＜1)|(0＜＜0); //DMA通道開(kāi)啟
rIISCON |= 0x1; //IIS開(kāi)啟
}
void __irq DMA2_ISR(void){
rSRCPND |= 1＜＜19;
rINTPND |= 1＜＜19;
if(flag == 0){
rIISCON = 0x0; //關(guān)閉IIS
rIISFCON = 0x0; //關(guān)閉IISFIFO的DMA模式
rDMASKTRIG2 = 1＜＜2; //關(guān)閉DMA
}
else{
result--;
rDISRC2 += 0x200000; //因?yàn)槭前胱?
if(result == 0){
flag = 0;
rDCON2 = (rDCON2 & ("0xfffff)) | (remain);
}
rDMASKTRIG2 = (0＜＜2)|(1＜＜1)|(0＜＜0);
}
}
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);
rSRCPND |= 1＜＜19;
rINTPND |= 1＜＜19;
rINTMSK &= "(1＜＜19);
rGPFCON = 0xd57f;
rGPFUP = 0x87;
pISR_DMA2 = (U32)DMA2_ISR;
PlayMusic(music, sizeof(music));
while(1){
Led(); //占用CPU
}
return 0;
}
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