PIC16F1578 PWM项目

这个段落与如何分配输出到引脚无关。这是在PPS章节中所涉及的。



      以下为原文

    That paragraph has nothing to do with how you assign outputs to pins.
That is covered in the "PPS" chapter.
 

谢谢Qyb，我有一些关于中断的问题，可以问一下，因为它是同一个项目吗？这是为了降低PWM的占空比，由于某些原因，当模拟器的端口输入改变时，它不会跳转到中断。请参见附加代码；编辑：由于某些原因，RC4和RC5在PORTCbits上显示高电平，我将其WPU比特设置为0，在下一次运行时得到。卡在中断例程中，看到IOCIF＝1，边＝0。



      以下为原文

    Thanks Qyb, I'm having some issues with interrupt on change is it OK to question it here as it's same project? it's required for lowering changing the duty cycle of PWM.
 
for some reason it doesn't jump to the interrupt when the port input is changed in the simulator.
 
Please see attached code;
/******************************************************************************/
/* CyclePlateV2.00 */
/* Microcontroller: PIC16F1578 */
/* PCB: Cycle Plate 2018 */
/* Author: btommo Date: 26/06/18 */
/******************************************************************************/

// CONFIG1
#pragma config FOSC = INTOSC // Oscillator Selection Bits (INTOSC oscillator; I/O function on CLKIN pin)
#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 BOREN = ON // Brown-out Reset Enable (Brown-out Reset enabled)
#pragma config CLKOUTEN = OFF // Clock Out Enable (CLKOUT function is disabled. I/O or oscillator function on the CLKOUT pin)


// CONFIG2
#pragma config WRT = OFF // Flash Memory Self-Write Protection (Write protection off)
#pragma config PPS1WAY = ON // PPSLOCK bit One-Way Set Enable bit (PPSLOCKED Bit Can Be Cleared & Set Once)
#pragma config PLLEN = ON // PLL Enable (4x PLL enabled)
#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 LPBOREN = OFF // Low Power Brown-out Reset enable bit (LPBOR is disabled)
#pragma config LVP = ON // Low-Voltage Programming Enable (Low-voltage programming enabled)

// #pragma config statements should precede project file includes.
// Use project enums instead of #define for ON and OFF.

#include
#include
#include
/******************************************************************************/
/*CONFIGURATION */
/******************************************************************************/
#define _XTAL_FREQ 32000000 //oscillator frequency for delay_ms()


/******************************************************************************/
/* User Global Variable Declaration */
/******************************************************************************/
#define TURN PORTCbits.RC4 //positive trigger
#define SIDE PORTCbits.RC5 //positive trigger
#define RING PORTCbits.RC0 //pull up required
#define CYCLEPWM PORTBbits.RB4
#define CRNRPWM PORTBbits.RB5
#define RINGPWM PORTBbits.RB6


uint8_t db_cnt; //debounce counter
//uint8_t RLYs;
//uint8_t MOMs;

/******************************************************************************/
/* Main Program */
/******************************************************************************/

void initialise()
{
    TRISB = 0;
    TRISC = 0b00110001;
    ANSELA = 0;
    ANSELB = 0;
    ANSELC = 0;
    
    //Oscillator control Register
    
    OSCCONbits.IRCF = 0b1110; //32MHz freguency instruction osc 8MHz
    OSCTUNEbits.TUN = 0; // Running at factory calibrated frequency
    
    //Option register
    OPTION_REGbits.nWPUEN = 0; //weak pull-ups enables by WPUX
    OPTION_REGbits.TMR0CS = 0; //TMR0 clock source is cycle clock
    OPTION_REGbits.PSA = 0; //Prescaler assigned to TMR0
    OPTION_REGbits.PS = 0b111; //prescaler set to 1:256 (set after!!!)
    
    //INTCON
    INTCONbits.GIE = 1; //enable active interrupts
    INTCONbits.PEIE = 1; //enable active peripheral interrupts
    //INTCONbits.TMR0IE = 1; //enable TMR0 interrupt
    //INTCONbits.TMR0IF = 0; //reset TMR0 interrupt flag
    INTCONbits.IOCIE = 1; // enable interrupt on change
    INTCONbits.IOCIF = 0; // reset IOC flag
    
    IOCCPbits.IOCCP5 = 1; //rising and falling edge detection for SIDE
    IOCCNbits.IOCCN5 = 1;
    
    ADCON0bits.ADON = 0; // Disable ADC
    
    
    WPUCbits.WPUC0 = 1; //pull up on RING
    
    //PWM control
    PWM1CONbits.EN = 1;
    PWM1CONbits.POL = 0;
    PWM1CONbits.MODE = 0b00;
    
    PWM2CONbits.EN = 1;
    PWM2CONbits.POL = 0;
    PWM2CONbits.MODE = 0b00;
    
    PWM3CONbits.EN = 1;
    PWM3CONbits.POL = 0;
    PWM3CONbits.MODE = 0b00;
    
    //PWM interrupt on period
    /*PWM1INTEbits.PRIE = 1;
    PWM2INTEbits.PRIE = 1;
    PWM3INTEbits.PRIE = 1;*/
    
    PWM1CLKCONbits.CS = 0b00; //FOSC
    PWM2CLKCONbits.CS = 0b00;
    PWM3CLKCONbits.CS = 0b00;
    
    PWM1CLKCONbits.PS = 0b000; //no prescaller period 8.192ms max
    PWM2CLKCONbits.PS = 0b000; //1/8x10^6 * 2^16
    PWM3CLKCONbits.PS = 0b000; //for 5ms 2^16/8.192 * 5 = 40000
                                //load 2^16 - 40000 =25536
                                //Load 40000 into PRx
    //PWM load buffers at end of each period
    PWM1LDCONbits.LDA = 1; //load OFx PHx DCx and PRx at end of current period
    PWM1LDCONbits.LDT = 0;
    PWM2LDCONbits.LDA = 1;
    PWM2LDCONbits.LDT = 0;
    PWM3LDCONbits.LDA = 1;
    PWM3LDCONbits.LDT = 0;
    
    PWM1OFCONbits.OFM = 0b00;
    PWM2OFCONbits.OFM = 0b00;
    PWM3OFCONbits.OFM = 0b00;
    
    //set Period of PWM 40000 = 5ms
    PWM1PR = 40000;
    PWM2PR = 40000;
    PWM3PR = 40000;
    
    //set initial duty cycle to 99%
    //Duty cycle = (PWMxDC - PWMxPH)/PWMxPR+1
    //PWMxDC = 0.99*(PWMxPR+1)+PWMxPH
    //=0.99*40001+0
    PWM1DC = 39601;
    PWM2DC = 39601;
    PWM3DC = 39601;
    
    //for 20% duty cycle
    //PWMxDC = 0.2*40001+0
    //=8000
    
    //setting PWMxPH 0
    PWM1PH = 0;
    PWM2PH = 0;
    PWM3PH = 0;
    
    //set pin for PWM
    RB4PPS = 0b0011; //PWM1out
    RB5PPS = 0b0100; //PWM2out
    RB6PPS = 0b0101; //PWM3out
    
    
}

void interrupt isr (void)
{
    if (INTCONbits.IOCIF == 1)
    {
        INTCONbits.IOCIF = 0;
        if(SIDE == 0)
    {
        PWM1DC = 39601;
        PWM2DC = 39601;
        PWM3DC = 39601;
        
        
    }
    if(SIDE == 1)
    {
        PWM1DC = 8000;
        PWM2DC = 8000;
        PWM3DC = 8000;
        
    }
        
        
    }
    /*if (PWM1INTFbits.PRIF == 1)
    {
        PWM1INTFbits.PRIF = 0;
    }
    if (PWM2INTFbits.PRIF == 1)
    {
        PWM2INTFbits.PRIF = 0;
    }
    if (PWM3INTFbits.PRIF == 1)
    {
        PWM3INTFbits.PRIF = 0;
    }*/
}



void main()
{
    initialise();
      
   //MAIN LOOP
    while(1)
    {
        
    }
        
    
  
    return;
}


 
Edit: for some reason RC4 and RC5 showed a high on the PORTCbits, i set their WPU bits to 0 and on the next run it got stuck in the interrupt routine seeing IOCIF == 1 and side == 0.
 
 
 

我没有发现实际的问题，但是你的代码中有两个注释包括：PIC16F1578。h & gt；xc.h已经为你做了。你不能清除密码。IOCIF.数据表告诉你这是一个只读标志，你可以通过清除IOCAF、IOCBF、IOCF中的位来清除它。



      以下为原文

    I don't spot the actual problem, but a couple of notes on your code
 
Don't #include
xc.h has already done that for you.
 
You can't clear INTCONbits.IOCIF
The datasheet tells you that is a read-only flag, you can only clear it by clearing the bits in IOCAF, IOCBF, IOCCF

感谢我做了这些改变，我刚刚在硬件上测试了一个，而PWM周期似乎只有1.25ms，而不是用8MHz指令频率（FoCC＝32兆赫）计算的5ms，即使RC5（旁侧）高的输入，它似乎对任何PWM的占空比没有影响。运行模拟与您提到的笔记和弱拉起的RC4和RC5禁用，程序停留在主回路，无论状态或RC5，并没有影响的价值存储在PWMXDC寄存器。编辑：发现我需要1:4预分频器的PWM时钟，因为它使用FoSC和非指令周期（FoCC／4）在改变“边”编辑时的上升沿或下降沿时仍不确定占空比：我刚刚在PCB上运行了下面的程序：当PCB最初被供电时，当PCB最初被供电时，占空比减小，而PCB则不占空。首先是电源，然后是高电平应用到“侧”，但我已经在初始化，只设置占空比为99%。当侧输入变为低时，占空比在20%处保持不变，而不是被改变为99%，但是在软件仿真中，PWMXDC改变为初始值为99%，该值是否需要加载到另一个位置？还是只有PWMXDC控制占空比？编辑：在模拟器上运行程序时，程序似乎不会被卡住，当定时器中断标志发生时，根据“侧”RC5的状态改变PWMXDC值（不确定它是否仅仅是IOC设置，所以我使用定时器1中断）编辑：我必须解开。E和重新启用PWMS在中断占空比改变。



      以下为原文

    Thanks I have made those changes, I've just tested one on hardware and the PWMs period only seems to be 1.25mS as opposed to 5ms as calculated using 8MHz instruction frequency (fosc= 32MHz) and even with the input on RC5 (SIDE) High it seems to have no impact to the duty cycle of any PWM.
 
Edit: I reran the simulation with the notes you mentioned and the weak pull up for RC4 and RC5 disabled and the program stays in the main loop no matter the state or RC5 and doesn't have an impact on the value stored in the PWMxDC registers.
 
Edit: found out I needed 1:4 prescaler for the PWM clock as it uses fosc and not instruction cycle (fosc/4) still not sure on changing the duty cycle when it sees a rising edge or falling edge on "SIDE"
 
Edit: I've just ran the below program on a PCB:
 
/******************************************************************************/
/* CyclePlateV2.00 */
/* Microcontroller: PIC16F1578 */
/* PCB: Cycle Plate 2018 */
/* Author: btommo Date: 26/06/18 */
/******************************************************************************/

// CONFIG1
#pragma config FOSC = INTOSC // Oscillator Selection Bits (INTOSC oscillator; I/O function on CLKIN pin)
#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 BOREN = ON // Brown-out Reset Enable (Brown-out Reset enabled)
#pragma config CLKOUTEN = OFF // Clock Out Enable (CLKOUT function is disabled. I/O or oscillator function on the CLKOUT pin)


// CONFIG2
#pragma config WRT = OFF // Flash Memory Self-Write Protection (Write protection off)
#pragma config PPS1WAY = ON // PPSLOCK bit One-Way Set Enable bit (PPSLOCKED Bit Can Be Cleared & Set Once)
#pragma config PLLEN = ON // PLL Enable (4x PLL enabled)
#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 LPBOREN = OFF // Low Power Brown-out Reset enable bit (LPBOR is disabled)
#pragma config LVP = ON // Low-Voltage Programming Enable (Low-voltage programming enabled)

// #pragma config statements should precede project file includes.
// Use project enums instead of #define for ON and OFF.

#include
#include
/******************************************************************************/
/*CONFIGURATION */
/******************************************************************************/
#define _XTAL_FREQ 32000000 //oscillator frequency for delay_ms()


/******************************************************************************/
/* User Global Variable Declaration */
/******************************************************************************/
#define TURN PORTCbits.RC4 //positive trigger
#define SIDE PORTCbits.RC5 //positive trigger
#define RING PORTCbits.RC0 //pull up required
#define CYCLEPWM PORTBbits.RB4
#define CRNRPWM PORTBbits.RB5
#define RINGPWM PORTBbits.RB6


uint8_t db_cnt; //debounce counter
//uint8_t RLYs;
//uint8_t MOMs;

/******************************************************************************/
/* Main Program */
/******************************************************************************/

void initialise()
{
    TRISB = 0;
    TRISC = 0b00110001;
    TRISA = 0;
    ANSELA = 0;
    ANSELB = 0;
    ANSELC = 0;
    
    //Oscillator control Register
    
    OSCCONbits.IRCF = 0b1110; //32MHz freguency instruction osc 8MHz
    OSCTUNEbits.TUN = 0; // Running at factory calibrated frequency
    
    //Option register
    OPTION_REGbits.nWPUEN = 0; //weak pull-ups enables by WPUX
    OPTION_REGbits.TMR0CS = 0; //TMR0 clock source is cycle clock
    OPTION_REGbits.PSA = 0; //Prescaler assigned to TMR0
    OPTION_REGbits.PS = 0b111; //prescaler set to 1:256 (set after!!!)
    
    //INTCON
    INTCONbits.GIE = 1; //enable active interrupts
    INTCONbits.PEIE = 1; //enable active peripheral interrupts
    //INTCONbits.TMR0IE = 1; //enable TMR0 interrupt
    //INTCONbits.TMR0IF = 0; //reset TMR0 interrupt flag
    INTCONbits.IOCIE = 1; // enable interrupt on change
    IOCAF = 0;
    IOCBF = 0;
    IOCCF = 0;
    
    IOCCPbits.IOCCP5 = 1; //rising and falling edge detection for SIDE
    IOCCNbits.IOCCN5 = 1;
    
    //Peripheral Interrupt enable
    PIR1bits.TMR1IF = 0;
    PIE1bits.TMR1IE = 1;
    
    //TMR1
    T1CONbits.TMR1CS = 0b00;
    T1CONbits.T1CKPS = 0b00;
    T1CONbits.TMR1ON = 1;
    
    ADCON0bits.ADON = 0; // Disable ADC
    
    
    WPUCbits.WPUC0 = 1; //pull up on RING
    WPUCbits.WPUC4 = 0;
    WPUCbits.WPUC5 = 0;
    
    //PWM control
    PWM1CONbits.EN = 1;
    PWM1CONbits.POL = 0;
    PWM1CONbits.MODE = 0b00;
    
    PWM2CONbits.EN = 1;
    PWM2CONbits.POL = 0;
    PWM2CONbits.MODE = 0b00;
    
    PWM3CONbits.EN = 1;
    PWM3CONbits.POL = 0;
    PWM3CONbits.MODE = 0b00;
    
    //PWM interrupt on period
    /*PWM1INTEbits.PRIE = 1;
    PWM2INTEbits.PRIE = 1;
    PWM3INTEbits.PRIE = 1;*/
    
    PWM1CLKCONbits.CS = 0b00; //FOSC
    PWM2CLKCONbits.CS = 0b00;
    PWM3CLKCONbits.CS = 0b00;
    
    PWM1CLKCONbits.PS = 0b010; //no prescaller period 8.192ms max
    PWM2CLKCONbits.PS = 0b010; //1/8x10^6 * 2^16
    PWM3CLKCONbits.PS = 0b010; //for 5ms 2^16/8.192 * 5 = 40000
                                //load 2^16 - 40000 =25536
                                //Load 40000 into PRx
    //PWM load buffers at end of each period
    PWM1LDCONbits.LDA = 1; //load OFx PHx DCx and PRx at end of current period
    PWM1LDCONbits.LDT = 0;
    PWM2LDCONbits.LDA = 1;
    PWM2LDCONbits.LDT = 0;
    PWM3LDCONbits.LDA = 1;
    PWM3LDCONbits.LDT = 0;
    
    PWM1OFCONbits.OFM = 0b00;
    PWM2OFCONbits.OFM = 0b00;
    PWM3OFCONbits.OFM = 0b00;
    
    //set Period of PWM 40000 = 5ms
    PWM1PR = 40000;
    PWM2PR = 40000;
    PWM3PR = 40000;
    
    //set initial duty cycle to 99%
    //Duty cycle = (PWMxDC - PWMxPH)/PWMxPR+1
    //PWMxDC = 0.99*(PWMxPR+1)+PWMxPH
    //=0.99*40001+0
    PWM1DC = 39601;
    PWM2DC = 39601;
    PWM3DC = 39601;
    
    //for 20% duty cycle
    //PWMxDC = 0.2*40001+0
    //=8000
    
    //setting PWMxPH 0
    PWM1PH = 0;
    PWM2PH = 0;
    PWM3PH = 0;
    
    //set pin for PWM
    RB4PPS = 0b0011; //PWM1out
    RB5PPS = 0b0100; //PWM2out
    RB6PPS = 0b0101; //PWM3out
    
    
}

void interrupt isr (void)
{
    if (INTCONbits.IOCIF == 1)
    {
        IOCAF = 0;
        IOCBF = 0;
        IOCCF = 0;
        if(SIDE == 0)
    {
        PWM1DC = 39601;
        PWM2DC = 39601;
        PWM3DC = 39601;
        
        
    }
    if(SIDE == 1)
    {
        PWM1DC = 8000;
        PWM2DC = 8000;
        PWM3DC = 8000;
        
    }
    }
    if (PIR1bits.TMR1IF == 1)
    {
        PIR1bits.TMR1IF = 0;
        if(SIDE == 0)
    {
        PWM1DC = 39601;
        PWM2DC = 39601;
        PWM3DC = 39601;
    }
    if(SIDE == 1)
    {
        PWM1DC = 8000;
        PWM2DC = 8000;
        PWM3DC = 8000;
    }
    }
    /*if (PWM1INTFbits.PRIF == 1)
    {
        PWM1INTFbits.PRIF = 0;
    }
    if (PWM2INTFbits.PRIF == 1)
    {
        PWM2INTFbits.PRIF = 0;
    }
    if (PWM3INTFbits.PRIF == 1)
    {
        PWM3INTFbits.PRIF = 0;
    }*/
}



void main()
{
    initialise();
      
   //MAIN LOOP
    while(1)
    {
        
    }
        
    
  
    return;
}


 
the Duty cycle is reduced when it sees a high on the "SIDE" input when the PCB is initially powered but not if the PCB is powered first and then a high is applied to "SIDE" but I've looked in initialisation which only sets the duty cycle to 99%. When the SIDE input is changed to a low the duty cycle stays the same at 20% as opposed to being changed back to 99% but in software simulation the PWMxDC changes back to the initial value for 99%, does the value need to be loaded into another location? or is it only PWMxDC that governs the duty cycle?
 
edit: Running through the program on the simulator the program doesn't seem to get stuck and changes PWMxDC values based on the state of "SIDE" RC5 when the timer interrupt flag occurs (wasn't sure if it was just the IOC settings so I'm using timer 1 interrupt)
 
edit: figured out that I had to disable and re-enable the PWMs in the interrupt for the duty cycle to change.