PIC蜂鸣器教程

项目目标：编制一个演奏乐曲的程序，并同时使用LED打节拍

打开MCC 进行配置   具体的配置如下（MCC配置教程在下面）

PWM6

TMR0

TMR2

中断

IO

系统时钟

基础设置之后修改main.c文件

/**
  Generated Main Source File

  Company:
    Microchip Technology Inc.

  File Name:
    main.c

  Summary:
    This is the main file generated using PIC10 / PIC12 / PIC16 / PIC18 MCUs

  Description:
    This header file provides implementations for driver APIs for all modules selected in the GUI.
    Generation Information :
        Product Revision  :  PIC10 / PIC12 / PIC16 / PIC18 MCUs - 1.81.7
        Device            :  PIC16F18446
        Driver Version    :  2.00
*/

/*
    (c) 2018 Microchip Technology Inc. and its subsidiaries. 
    
    Subject to your compliance with these terms, you may use Microchip software and any 
    derivatives exclusively with Microchip products. It is your responsibility to comply with third party 
    license terms applicable to your use of third party software (including open source software) that 
    may accompany Microchip software.
    
    THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES, WHETHER 
    EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE, INCLUDING ANY 
    IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY, AND FITNESS 
    FOR A PARTICULAR PURPOSE.
    
    IN NO EVENT WILL MICROCHIP BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, 
    INCIDENTAL OR CONSEQUENTIAL LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND 
    WHATSOEVER RELATED TO THE SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP 
    HAS BEEN ADVISED OF THE POSSIBILITY OR THE DAMAGES ARE FORESEEABLE. TO 
    THE FULLEST EXTENT ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL 
    CLAIMS IN ANY WAY RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT 
    OF FEES, IF ANY, THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS 
    SOFTWARE.
*/

#include "mcc_generated_files/mcc.h"

/*
                         Main application
 */

#define timer_factor 1.0016     //calibrate the offset of the timer.
#define timer_2_PR_counter 64  //PR counter for timer2 is 64us. it means when PR register is 0x00,
                               //the period of timer2 is 64us.
//C、D、E、F、G、A、B分别对应简谱1234567
#define C 260
#define D 293
#define E 329
#define F 349
#define G 392
#define A 440
#define B 494
#define H_C 523

int i =0;
int j =0;
int flag = 0;

unsigned int a[14] = {C,D,E,F,G,A,B,H_C,B,A,G,F,E,D};       // just simple notes         
//unsigned int a[15] = {C,10000000,E,10000000,G,10000000,B,H_C,10000000,A,G,F,10000000,D,C};


void frequency_change(void) //change the frequency of tmr2 every 500ms/1beat
{
   
            TMR2_LoadPeriodRegister(a[i]);
            i++;
            if(i == 14)
                {
                    i=0;
                }
             IO_RA1_Toggle();           //LED toggle to simulate the beat               
             IO_RA0_Toggle();
}


void main(void)
{
    
    SYSTEM_Initialize();
    
    TMR2_LoadPeriodRegister(a[i]);                  //first set the C note to let the buzzer not scream.
    for(int k=0; k<=13; k++)
    {
        a[k] = (1000000/a[k]*timer_factor)/64;      //this result a[k] is the values we need to write into PR Register.
                                                    //e.g: 260Hz, so the period is 3.846ms, so the PR Register is 
    }                                               //1000000/260/1.0016/64 = 60 = 0x3C.

    INTERRUPT_GlobalInterruptEnable();

    TMR0_SetInterruptHandler(frequency_change);     //Timer0 interrupt function; using this one to change the 
                                                    //frequency of the timer2, as well as the period of PWM.
    TMR0_StartTimer();
    TMR2_StartTimer();
    
    while (1)
    {
        // Add your application code
    }
}
/**
 End of File
*/