帮我写一段msp430播放生日快乐歌的代码
时间: 2023-05-24 10:02:02 浏览: 51
好的,以下是一段可以在 MSP430 微控制器上播放《生日快乐》曲调的代码:
```
#include <msp430.h>
#define NOTE_C4 382
#define NOTE_D4 340
#define NOTE_E4 303
#define NOTE_F4 286
#define NOTE_G4 255
#define NOTE_A4 227
#define NOTE_B4 202
#define DELAY_QUARTER 500
#define DELAY_HALF 1000
#define DELAY_WHOLE 2000
void playNote (int noteFrequency, long noteDuration)
{
long delay = (long)(noteDuration * 1.3);
long time = (long)((1000000 / noteFrequency) / 2);
long cycles = (long)(delay / time);
for (int i = 0; i < cycles; i++)
{
P1OUT |= BIT0;
__delay_cycles(time);
P1OUT &= ~BIT0;
__delay_cycles(time);
}
__delay_cycles(DELAY_QUARTER);
}
void playHappyBirthday()
{
playNote(NOTE_G4, DELAY_QUARTER);
playNote(NOTE_G4, DELAY_QUARTER);
playNote(NOTE_A4, DELAY_HALF);
playNote(NOTE_G4, DELAY_HALF);
playNote(NOTE_C4, DELAY_HALF);
playNote(NOTE_B4, DELAY_WHOLE);
}
int main(void)
{
WDTCTL = WDTPW | WDTHOLD;
P1DIR |= BIT0;
while (1)
{
playHappyBirthday();
__delay_cycles(3000000);
}
return 0;
}
```
这段代码使用了 P1.0 管脚作为扬声器,通过发出指定频率的脉冲来播放音符。`playNote` 函数接受两个参数:音符频率和持续时间。这两个值可以在调用 `playHappyBirthday` 函数时进行设置来播放不同的音调和节奏。