S3C2440-蜂鸣器
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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;
}
使用定时器产生中断使IO电平翻转，控制蜂鸣器:
定时器注意设置rINTMSK开中断，并在中断处理程序中清除中断请求位。rSRCPND |= 0x1＜＜10;rINTPND |= 0x1＜＜10;清除rINTPND通过设置相应为1进行清除。rSTCPND是向相应位写数据清除。如果不清除，会一直响应这个中断。在Main函数中清一下是为了防止以前这个位申请中断，所以清一下，以防万一。定时器接在APB总线上，所以用PCLK时钟。在这里我设预分频为0x64，除法器为16，rTCNTB0为0x7a12，所以 50M/0x64/16/0x7a12为1HZ，所以中断周期为1s，所以每一秒蜂鸣器响一下，然后隔一秒，然后再响。
#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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