WiringPi是一个相当成熟的C语言中的RPi GPIO访问库。
它还附带了像PWM和tones这样的东西，应该会很有帮助。
下面是一个如何使用它的示例：

# include <wiringPi.h>

# include <softTone.h>

# include <stdio.h>

# define BuzzPin 0

# define CL1 131

# define CL2 147

# define CL3 165

# define CL4 175

# define CL5 196

# define CL6 221

# define CL7 248

# define CM1 262

# define CM2 294

# define CM3 330

# define CM4 350

# define CM5 393

# define CM6 441

# define CM7 495

# define CH1 525

# define CH2 589

# define CH3 661

# define CH4 700

# define CH5 786

# define CH6 882

# define CH7 990

int song_1[] = {CM3,CM5,CM6,CM3,CM2,CM3,CM5,CM6,CH1,CM6,CM5,CM1,CM3,CM2,
CM2,CM3,CM5,CM2,CM3,CM3,CL6,CL6,CL6,CM1,CM2,CM3,CM2,CL7,
CL6,CM1,CL5};

int beat_1[] = {1,1,3,1,1,3,1,1,1,1,1,1,1,1,3,1,1,3,1,1,1,1,1,1,1,2,1,1,
1,1,1,1,1,1,3};

int song_2[] = {CM1,CM1,CM1,CL5,CM3,CM3,CM3,CM1,CM1,CM3,CM5,CM5,CM4,CM3,CM2,
CM2,CM3,CM4,CM4,CM3,CM2,CM3,CM1,CM1,CM3,CM2,CL5,CL7,CM2,CM1
};

int beat_2[] = {1,1,1,3,1,1,1,3,1,1,1,1,1,1,3,1,1,1,2,1,1,1,3,1,1,1,3,3,2,3};

int main(void) {
  int i, j;

  if (wiringPiSetup() == -1) {
    When wiringpi initialization failed printf "WiringPi Failed"
    printf("14CORE | WiringPi initialization failed !");
    return 1;
  }

  if (softToneCreate(BuzzPin) == -1) {
    printf("14CORE| Soft Tone Failed !");
    return 1;
  }

  while (1) {
    printf("14CORE| Sound is generated...\n");

    for (i = 0; i < sizeof(song_1) / 4; i++) {
      softToneWrite(BuzzPin, song_1[i]);
      delay(beat_1[i] * 500);
    }

    for (i = 0; i < sizeof(song_2) / 4; i++) {
      softToneWrite(BuzzPin, song_2[i]);
      delay(beat_2[i] * 500);
    }
  }

  return 0;
}