S3C2440-蜂鳴器
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#define rGPBCON (*(volatile unsigned *)0x56000010)
#define rGPBDAT (*(volatile unsigned *)0x56000014)
#define rGPBUP (*(volatile unsigned *)0x56000018)
#define rTCFG0 (*(volatile unsigned *)0x51000000)
#define rTCFG1 (*(volatile unsigned *)0x51000004)
#define rTCNTB0 (*(volatile unsigned *)0x5100000C)
#define rTCMPB0 (*(volatile unsigned *)0x51000010)
#define rTCON (*(volatile unsigned *)0x51000008)
int Main(){
rGPBCON &= 0xfffffc;
rGPBCON |= 0x2;
rTCFG0 &= "0xff;
rTCFG0 |= 0x64;
rTCFG1 &= "0xf;
rTCFG1 |= 0x3;
rTCNTB0 = 0x7530;
rTCMPB0 = rTCNTB0＞＞1;
rTCON &= "0x1f;
rTCON |= (0x1)|(0x1＜＜1)|(0x1＜＜3);
rTCON &= "2;
while(1);
return 0;
}
使用定時器產生中斷使IO電平翻轉，控制蜂鳴器:
定時器注意設置rINTMSK開中斷，并在中斷處理程序中清除中斷請求位。rSRCPND |= 0x1＜＜10;rINTPND |= 0x1＜＜10;清除rINTPND通過設置相應為1進行清除。rSTCPND是向相應位寫數(shù)據(jù)清除。如果不清除，會一直響應這個中斷。在Main函數(shù)中清一下是為了防止以前這個位申請中斷，所以清一下，以防萬一。定時器接在APB總線上，所以用PCLK時鐘。在這里我設預分頻為0x64，除法器為16，rTCNTB0為0x7a12，所以 50M/0x64/16/0x7a12為1HZ，所以中斷周期為1s，所以每一秒蜂鳴器響一下，然后隔一秒，然后再響。
#define rGPBCON (*(volatile unsigned *)0x56000010)
#define rGPBDAT (*(volatile unsigned *)0x56000014)
#define rGPBUP (*(volatile unsigned *)0x56000018)
#define rSRCPND (*(volatile unsigned *)0x4A000000)
#define rINTPND (*(volatile unsigned *)0x4A000010)
#define rTCFG0 (*(volatile unsigned *)0x51000000)
#define rTCFG1 (*(volatile unsigned *)0x51000004)
#define rTCNTB0 (*(volatile unsigned *)0x5100000C)
#define rTCON (*(volatile unsigned *)0x51000008)
#define rINTMSK (*(volatile unsigned *)0x4A000008)
#define U32 unsigned int
#define _ISR_STARTADDRESS 0x33ffff00
#define pISR_TIMER0 (*(unsigned *)(_ISR_STARTADDRESS+0x48))
int count;
void __irq Timer0_ISR(void){
rSRCPND |= 0x1＜＜10;
rINTPND |= 0x1＜＜10;
count++;
if(count %2 == 1)
rGPBDAT |= 0x01;
else
rGPBDAT &= 0xfe;
if(count == 1000)
count = 0;
}
int Main(){
count = 0;
rGPBCON &= 0xfffffc;
rGPBCON |= 0x1;
rGPBDAT &= 0xffe;
rGPBUP &= 0xfe;
pISR_TIMER0 = (U32)Timer0_ISR;
rSRCPND |= 0x1＜＜10;
rINTPND |= 0x1＜＜10;
rINTMSK &= "(0x1＜＜10);
rTCFG0 &= "0xff;
rTCFG0 |= 0x64;
rTCFG1 &= "0xf;
rTCFG1 |= 0x3;
rTCNTB0 = 0x7a12;
rTCON &= "0x1f;
rTCON |= 0xb;
rTCON &= "0x2;
while(1);
return 0;
}
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