uchar i;
WDTCTL = WDTPW + WDTHOLD; //关狗
BoardConfig(0xb0); //关数码管、流水灯和电平转换
/*------选择系统主时钟为8MHz-------*/
BCSCTL1 &= ~XT2OFF; //打开XT2高频晶体振荡器 do {
IFG1 &= ~OFIFG; //清除晶振失败标志 for (i = 0xFF; i > 0; i--); //等待8MHz晶体起振
}
while ((IFG1 & OFIFG)); //晶振失效标志仍然存在？
BCSCTL2 |= SELM_2 + SELS; //MCLK和SMCLK选择高频晶振
TACCTL0 |= CCIE; //使能比较中断
TACTL |= TASSEL_2 + ID_3 ; //计数时钟选择SMLK=8MHz，1/8分频后为1MHz
TBCCR0 = 4096*2 - 1; //周期两秒
TBCCTL0 |= CCIE;
TBCTL |= TBSSEL_1 + ID_3 + MC_1; //时钟源ACLK/8，up mode
P6DIR |= BIT7; //蜂鸣器对应IO设置为输出 P2DIR = 0xff; P2OUT = 0xff;
_EINT();
LPM1; }
/******************************************* 函数名称：Timer_A
功 能：定时器A的中断服务函数，在这里驱动 蜂鸣器发声 参 数：无 返回值 ：无
********************************************/ #pragma vector=TIMERA0_VECTOR __interrupt void Timer_A (void) {
P6OUT ^= BIT7; // Toggle P6.7 }
/******************************************* 函数名称：Timer_B
功 能：定时器B的中断服务函数，在这里更改
31
蜂鸣器发声频率 参 数：无 返回值 ：无
********************************************/ #pragma vector=TIMERB0_VECTOR __interrupt void Timer_B (void) {
if(step == 0xff) //up mode TACTL |= MC_1; step++; switch(step) {
case 0: TACCR0 = 5000; P2OUT = ~1; break; // 100Hz case 1: TACCR0 = 2500; P2OUT = ~2; break; // 200Hz case 2: TACCR0 = 1250; P2OUT = ~3; break; // 400Hz case 3: TACCR0 = 625; P2OUT = ~4; break; // 800Hz case 4: TACCR0 = 500; P2OUT = ~5; break; // 1KHz case 5: TACCR0 = 250; P2OUT = ~6; break; // 2KHz case 6: TACCR0 = 167; P2OUT = ~7; break; // 3KHz case 7: TACCR0 = 125; P2OUT = ~8; break; // 4KHz case 8: TACCR0 = 100; P2OUT = ~9; break; // 5KHz case case case case
9: TACCR0 = 83; 10: TACCR0 = 71; 11: TACCR0 = 63; 12: TACCR0 = 56;
P2OUT = ~10; P2OUT = ~11; P2OUT = ~12; P2OUT = ~13;
break; break; break; break;
// 6KHz // 7KHz // 8KHz // 9KHz
case 13: TACCR0 = 50; P2OUT = ~14; break; // 10KHz case 14: TACCR0 = 33; P2OUT = ~15; break; // 15KHz case 15: TACCR0 = 25; P2OUT = ~16; break; // 20KHz case 16: step = 0xff; // 循环播放 } } //《祝你平安》对应的编码 const unsigned char SONG[]= {
0x26,0x20,0x20,0x20,0x20,0x20,0x26,0x10,0x20, 0x10,0x20,0x80,0x26,0x20,0x30,0x20,0x30,0x20, 0x39,0x10,0x30,0x10,0x30,0x80,0x26,0x0,0x20, 0x20,0x20,0x20,0x1c,0x20,0x20,0x80,0x2b,0x20, 0x26,0x20,0x20,0x20,0x2b,0x10,0x26,0x10,0x2b, 0x80,0x26,0x20,0x30,0x20,0x30,0x20,0x39,0x10, 0x26,0x10,0x26,0x60,0x40,0x10,0x39,0x10,0x26, 0x20,0x30,0x20,0x30,0x20,0x39,0x10,0x6,0x10, 0x26,0x80,0x26,0x20,0x2b,0x10,0x2b,0x10,0x2b, 0x20,0x30,0x10,0x39,0x10,0x26,0x10,0x2b,0x10, 0x2b,0x20,0x2b,0x40,0x40,0x20,0x20,0x10,0x20,
32
0x10,0x2b,0x10,0x26,0x30,0x30,0x80,0x18,0x20, 0x18,0x20,0x26,0x20,0x20,0x20,0x20,0x40,0x26, 0x20,0x2b,0x20,0x30,0x20,0x30,0x20,0x1c,0x20, 0x20,0x20,0x20,0x80,0x1c,0x20,0x1c,0x20,0x1c,
0x20,0x30,0x20,0x30,0x60,0x39,0x10,0x30,0x10,
0x20,0x20,0x2b,0x10,0x26,0x10,0x2b,0x10,0x26, 0x10,0x26,0x10,0x2b,0x10,0x2b,0x80,0x18,0x20, 0x18,0x20,0x26,0x20,0x20,0x20,0x20,0x60,0x26, 0x10,0x2b,0x20,0x30,0x20,0x30,0x20,0x1c,0x20, 0x20,0x20,0x20,0x80,0x26,0x20,0x30,0x10,0x30, 0x10,0x30,0x20,0x39,0x20,0x26,0x10,0x2b,0x10, 0x2b,0x20,0x2b,0x40,0x40,0x10,0x40,0x10,0x20, 0x10,0x20,0x10,0x2b,0x10,0x26,0x30,0x30,0x80, 0x00 };
/********************************************* 程序功能：MCU控制蜂鸣器演奏歌曲《祝你平安》 ---------------------------------------------- 测试说明：聆听蜂鸣器“唱出”的乐曲
*********************************************/ #include
#define Buzzer BIT7 #define Buzzer_Port P6OUT #define Buzzer_DIR P6DIR
uchar counter;
void Play_Song(void);
/***************主函数****************/ void main(void) {
uchar i;
WDTCTL = WDTPW + WDTHOLD; //关闭看门狗 /*------选择系统主时钟为8MHz-------*/
BCSCTL1 &= ~XT2OFF; // 打开XT2高频晶体振荡器 do
{
IFG1 &= ~OFIFG; //清除晶振失败标志 for (i = 0xFF; i > 0; i--); // 等待8MHz晶体起振 }
33
while ((IFG1 & OFIFG)); // 晶振失效标志仍然存在？
BCSCTL2 |= SELM_2 + SELS; //主时钟和从时钟都选择高频晶振
BoardConfig(0xf8); //关闭数码管、流水灯、电平转换
//设置定时器A每10ms中断一次 CCTL0 = CCIE;
CCR0 = 10000;
TACTL |= TASSEL_2 + ID_3;
//设置控制蜂鸣器的IO方向为输出 Buzzer_DIR |= Buzzer; //打开全局中断 _EINT();
//循环演奏歌曲 while(1) {
Play_Song(); } }
/******************************************* 函数名称：TimerA_ISR
功 能：定时器A的中断服务函数 参 数：无 返回值 ：无
********************************************/ #pragma vector = TIMERA0_VECTOR __interrupt void TimerA_ISR(void) {
counter++;
}
/******************************************* 函数名称：Delay_Nms
功 能：延时N个ms的函数 参 数：n--延时长度 返回值 ：无
********************************************/ void Delay_Nms(uchar n) {
uchar i,j;
for( i = 0;i < n; i++ ) {
for( j = 0;j < 3;j++ ) _NOP();
34
}
}
/******************************************* 函数名称：Play_Song
功 能：播放《祝你平安》的乐曲 参 数：无 返回值 ：无
********************************************/ void Play_Song(void) {
uchar Temp1,Temp2; uchar addr = 0;
counter = 0; //中断计数器清0 while(1) {
Temp1 = SONG[addr++];
if ( Temp1 == 0xFF ) //休止符 {
TACTL &=~MC_1; //停止计数 Delay_Nms(100);
}
else if ( Temp1 == 0x00 ) //歌曲结束符 {
return; } else
{
Temp2 = SONG[addr++];
TACTL |=MC_1; //开始计数 while(1) {
Buzzer_Port ^= Buzzer; Delay_Nms(Temp1); if ( Temp2 == counter ) {
counter = 0; break; } } } } }
35