beep

unsigned short tone[14] = { 247,262,294,330,349,392,440,294,523,587,659,698,784,1000 };
unsigned char music[121] = { 5,5,6,8,7,6,5,6,13,13,
                5,5,6,8,7,6,5,3,13,13,
                2,2,3,5,3,5,6,3,2,1,
                6,6,5,6,5,3,6,5,13,13,

                5,5,6,8,7,6,5,6,13,13,
                5,5,6,8,7,6,5,3,13,13,
                2,2,3,5,3,5,6,3,2,1,
                6,6,5,6,5,3,6,1,

                13,8,9,10,10,9,8,10,9,8,6,
                13,6,8,9,9,8,6,9,8,6,5,
                13,2,3,5,5,3,5,5,6,8,7,6,
                6,10,9,9,8,6,5,6,8 };
unsigned char time[121] = { 2,4,2,2,2,2,2,8,4, 4, //时间
            2,4,2,2,2,2,2,8,4, 4,
            2,4,2,4,2,2,4,2,2,8,
            2,4,2,2,2,2,2,8,4 ,4,

            2,4,2,2,2,2,2,8,4, 4,
            2,4,2,2,2,2,2,8,4, 4,
            2,4,2,4,2,2,4,2,2,8,
            2,4,2,2,2,2,2,8,

            4, 2,2,2, 4, 2,2,2, 2,2,8,
            4, 2,2,2,4,2,2,2,2,2,8,
            4, 2,2,2,4,2,2,5,2,6,2,4,
            2,2 ,2,4,2,4,2,2,12 };
void beep_init(){
    GPIO_InitTypeDef gpio;
    gpio.Pin = GPIO_PIN_0;
    gpio.Pull = GPIO_PULLUP;
    gpio.Mode = GPIO_MODE_OUTPUT_PP;
    gpio.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
    HAL_GPIO_Init(GPIOB, &gpio);
}
void sound(unsigned short freq){
    unsigned int time;
    if(freq != 1000){
        time = 500000 / ((unsigned int)freq);
        HAL_GPIO_WritePin(GPIOB, GPIO_PIN_0, 0);
        delay_us(time);
        HAL_GPIO_WritePin(GPIOB, GPIO_PIN_0, 1);
        delay_us(time);
    }
    else{
        delay_us(1000);
    }

}