各種說明請參見上一篇led控制：http://www.zg4o1577.cn/mcu/2503.html 由于飛凌提供的源碼并不是定時器精確控制蜂鳴器的程序，所以自己寫了一個，群里需要裸機程序源碼的同志們可以自行在我空間下載，程序調試可用，注意添加飛凌的int.s文件，否則在codewarrior無法編譯，各種條件的文件請參詳飛凌paf，這里我只提供個程序代碼。
#define GPFCON (*(volatile unsigned*)(0x7F0080A0))
#define GPFDAT (*(volatile unsigned*)(0x7F0080A4))
#define GPFPUD (*(volatile unsigned*)(0x7F0080A8))
#define PCLK 66000000
#define HCLK 133000000
#define TCFG0 (*(volatile unsigned*)(0x7F006000))
#define TCFG1 (*(volatile unsigned*)(0x7F006004))
#define TCON (*(volatile unsigned*)(0x7F006008))
#define TCNTB0 (*(volatile unsigned*)(0x7F00600C))
#define TCMPB0 (*(volatile unsigned*)(0x7F006010))
#define TCNTO0 (*(volatile unsigned*)(0x7F006014))
#define TCNTB1 (*(volatile unsigned*)(0x7F006018))
#define TCMTB1 (*(volatile unsigned*)(0x7F00601C))
#define TCNTO1 (*(volatile unsigned*)(0x7F006020))
#define TCNTB2 (*(volatile unsigned*)(0x7F006024))
#define TCNTO2 (*(volatile unsigned*)(0x7F00602C))
#define TCNTB3 (*(volatile unsigned*)(0x7F006030))
#define TCNTO3 (*(volatile unsigned*)(0x7F006038))
#define TCNTB4 (*(volatile unsigned*)(0x7F00603C))
#define TCNTO4 (*(volatile unsigned*)(0x7F006040))
#define TINT_CSTAT (*(volatile unsigned*)(0x7F006044))
void udelay(unsigned int num)
{
unsigned int val;
val=PCLK/1000000-1;
TCFG0&=~(0xff<<8);
TCFG0|=(0x00<<8);
TCFG1&=~(0xf<<8);
TCFG1|=(0x0<<8);
TCNTB2=val;
TCON&=~(0xf<<12);
TCON|=(0xb<<12);
TCON&=~(2<<12);
while(num--)
{
while(TCNTO2>=val>>1);
while(TCNTO2<val>>1);
}
}
void init(void)
{
GPFCON&=~(2<<30);
GPFCON|=(1<<30);
GPFPUD&=~(0x3<<(2*15));
GPFDAT|=(0x8000);
}
void beep_off(void)
{
GPFDAT|=0x8000;
}
void beep_on(void)
{
GPFDAT&=0x7fff;
}
void beep(void)
{
while(1)
{
int i,j;
beep_on();
for(i=0;i<1000;i++)
udelay(1000);
beep_off();
for(j=0;j<5000;j++)
udelay(1000);
}
}
int main()
{
init();
beep();
}
int.s
IMPORT main
AREA |C$$code|, CODE, READONLY
global start
start
bl main
END