pic16f1939单片机pwm XC编译器例子 -

标题: pic16f1939单片机pwm XC编译器例子 [打印本页]

作者: king2007 时间: 2020-12-28 19:34
标题: pic16f1939单片机pwm XC编译器例子
LED5运行闪亮,LED0 渐亮渐暗

#include "xc.h"                   // 调用头文件

// CONFIG1
#pragma config FOSC = HS          // Oscillator Selection (HS Oscillator, High-speed crystal/resonator connected between OSC1 and OSC2 pins)
#pragma config WDTE = OFF          // Watchdog Timer Enable (WDT disabled)
#pragma config PWRTE = OFF       // Power-up Timer Enable (PWRT disabled)
#pragma config MCLRE = ON          // MCLR Pin Function Select (MCLR/VPP pin function is MCLR)
#pragma config CP = OFF          // Flash Program Memory Code Protection (Program memory code protection is disabled)
#pragma config CPD = OFF          // Data Memory Code Protection (Data memory code protection is disabled)
#pragma config BOREN = OFF       // Brown-out Reset Enable (Brown-out Reset disabled)
#pragma config CLKOUTEN = OFF    // Clock Out Enable (CLKOUT function is disabled. I/O or oscillator function on the CLKOUT pin)
#pragma config IESO = ON          // Internal/External Switchover (Internal/External Switchover mode is enabled)
#pragma config FCMEN = ON          // Fail-Safe Clock Monitor Enable (Fail-Safe Clock Monitor is enabled)

// CONFIG2
#pragma config WRT = OFF          // Flash Memory Self-Write Protection (Write protection off)
#pragma config VCAPEN = OFF       // Voltage Regulator Capacitor Enable (All VCAP pin functionality is disabled)
#pragma config PLLEN = OFF       // PLL Enable (4x PLL disabled)
#pragma config STVREN = ON       // Stack Overflow/Underflow Reset Enable (Stack Overflow or Underflow will cause a Reset)
#pragma config BORV = LO          // Brown-out Reset Voltage Selection (Brown-out Reset Voltage (Vbor), low trip point selected.)
#pragma config LVP = OFF          // Low-Voltage Programming Enable (High-voltage on MCLR/VPP must be used for programming)

//-------------------------------------------------------------------------------

#define _XTAL_FREQ    8000000L //外部 8MHz

#define LED0  LATCbits.LATC2       //LED宏定义
#define LED1  LATCbits.LATC1
#define LED2  LATCbits.LATC0
#define LED3  LATAbits.LATA5
#define LED4  LATAbits.LATA3
#define LED5  LATAbits.LATA2

#define SCLK  LATBbits.LATB0       //74HC595时钟
#define SDAT  LATBbits.LATB1       //74HC595数据
#define SRCK  LATCbits.LATC5       //74HC595锁存

#define KEY0  PORTEbits.RE3       //KEY宏定义
#define KEY1  PORTBbits.RB5
#define KEY2  PORTBbits.RB4

//-------------------------------------------------------------------------------

#define TMR1HPRELOAD 0xF0       //定时器初值
#define TMR1LPRELOAD 0x9B

unsigned char TickClock  = 0;    //2.5mS 时基
unsigned char Tmr1conunt = 0;    //定时计数

//-------------------------------------------------------------------------------
//       TMR1定时器初始化
//-------------------------------------------------------------------------------
void TMR1_Init(void)
{
      T1CONbits.TMR1CS = 0; //TMR1时钟 FOSC/4
      T1CONbits.T1CKPS = 1; //输入分频比1:2
      TMR1H  = 0xF0;       //8MHz  4mS
      TMR1L  = 0x5F;
      TMR1IF = 0;          //清中断标志
      TMR1IE = 1;          //中断允许
}

//-------------------------------------------------------------------------------
//       中断程序
//-------------------------------------------------------------------------------
void interrupt SystemISR(void)
{
      if(TMR1IE & TMR1IF)             // TMR1中断
      {
            TMR1IF= 0;
            TMR1H = 0xF0;
            TMR1L = 0x5F;
            TickClock = 1;                // 标志位
            Tmr1conunt ++;          // 计数
      }
}

//-------------------------------------------------------------------------------
//       CCP1初始化
//-------------------------------------------------------------------------------
void CCP1_Init(void)
{
      CCP1CON = 0b00001100;       //CCP1 为PWM模式
      CCPTMRS0= 0b00000000;       //CCP1~4 时钟来源TMR2
      CCPTMRS1= 0b00000000;       //CCP5 以Timer2 作为定时器
      CCP1IE = 0;
      CCP1IF = 0;

      T2CON = 0b01001100;          // Postcaler 1:10, T2ON
      PR2 = 249;                   // PWM周期 = (PR2+1)*4*TOSC
                                    // TOSC = 1/FOSC
      CCPR1L = 0x00;             // 占空比 0

      TMR2IF = 0;
      TMR2IE = 0;
}

//-------------------------------------------------------------------------------
//       CCP占空比程序
//-------------------------------------------------------------------------------
unsigned int  PWM_Duty = 0;    //PWM 占空比
unsigned char PWM_FLAG  = 0;    //渐变标志位
void Conver_CCPR1L(unsigned int Duty)       //PWM 占空比转换
{
      CCPR1L = (unsigned char)(Duty>>2);
      CCP1CON |= (unsigned char)((Duty&0x0003)<<4);
}

//-------------------------------------------------------------------------------
//       PWM控制LED部分
//-------------------------------------------------------------------------------
void PWM_LED(void)
{
      if (TickClock == 1)          //2.5mS
      {
            TickClock = 0;
            if(PWM_FLAG == 1)    //PWM LED  渐暗
            {
                     if(PWM_Duty != 0)
                              PWM_Duty --;
                     else
                              PWM_FLAG = 0;
            }
            else                   //PWM LED  渐亮
            {
                     if(PWM_Duty <1023)
                              PWM_Duty++;
                     else
                              PWM_FLAG = 1;
            }
            Conver_CCPR1L(PWM_Duty);
      }
}

//-------------------------------------------------------------------------------
//       系统初始化
//-------------------------------------------------------------------------------
void System_Init(void)
{
      ADCON1 = 0b10010011;          //Fosc/8 Vref = FVR
      ADCON0 = 0b00000001;          //ADON = 1 As AN0

      FVRCON = 0b10000011;          //Vref+ = 4.096V

      LATA  = 0b00000000;          //端口电平初始化
      LATB  = 0b00000000;
      LATC  = 0b00000000;
      LATD  = 0b00000000;
      LATE  = 0b00000000;

      TRISA  = 0b11000001;          //输入
      ANSELA = 0b00000001;          //RA0模拟 LED

      TRISB  = 0b00110000;          //RB4 RB5 mTouch
      ANSELB = 0b00110000;          //74HC164 CLK DAT

      TRISC  = 0b10011000;          //UART I2C

      TRISD  = 0b00000000;          //输出
      ANSELD = 0b00000000;          //数字I/O

      TRISE  = 0b00000000;          //输出
      ANSELE = 0b00000000;          //数字I/O
}

//-------------------------------------------------------------------------------
//       LED灯开机显示
//-------------------------------------------------------------------------------
void StartViewLED(void)
{
      LED0 = 1;             //LED0-LED5 亮
      LED1 = 1;
      LED2 = 1;
      LED3 = 1;
      LED4 = 1;
      LED5 = 1;
      __delay_ms(800);       //延时
      LED0 = 0;             //LED0-LED5 灭
      LED1 = 0;
      LED2 = 0;
      LED3 = 0;
      LED4 = 0;
      LED5 = 0;
      __delay_ms(50);       //延时
}

//-------------------------------------------------------------------------------
//       主程序部分
//-------------------------------------------------------------------------------
void main(void)
{
      System_Init();             //系统初始化
      StartViewLED();             //开机LED显示

      TMR1_Init();                //TMR1初始化
      CCP1_Init();                //CCP1初始化

      INTCONbits.PEIE = 1;       //外设中断
      INTCONbits.GIE  = 1;       //系统中断
      T1CONbits.TMR1ON= 1;       //TMR1使能
      while(1)
      {
            PWM_LED();                //渐变
            if(Tmr1conunt > 199)       //500mS
            {
                     Tmr1conunt = 0;
                     LED5 = !LED5;       //运行灯
            }
      }
}

作者: 465501297 时间: 2024-8-21 11:35
中断函数要改成：void __interrupt() isr(void)
不然会报错

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