求助！PIC16f877產(chǎn)生的PWM.
單片機產(chǎn)生的兩路PWM只能是同步的嗎？我想驅(qū)動半橋電路，怎么延時半個周期啊？
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@xiaoxiaoluohen
看到很多人做出來了，但具體怎么實現(xiàn)的都沒說~
include
#include
void CCP1_init(void)
{
CCPR1L=0x19; //通過設(shè)CCPR1L:及CCP1CON(bit4,bit5)確定高電平時間,
CCP1CON=0x0f;
INTCON=0x00; //關(guān)閉總中斷及外圍中斷
PR2=0x31; //16位，設(shè)定周期,即頻率，設(shè)定的值與頻率大小成反比
//通過周期的倒數(shù)計算時間，單位us，再轉(zhuǎn)為16進制,或直接輸入10進制的值
TRISC=0xfb; //設(shè)RC2為PWM輸出
T2CON=0x04; //開啟TMR2，預(yù)分頻為1,bit2=1為TIMER2使能位,bit1:bit0為預(yù)分頻
}
void main(void)
{
CCP1_init(); //PWM初始化
while (1)
{
;
}
}
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@adengadeng
include#include voidCCP1_init(void) { CCPR1L=0x19; //通過設(shè)CCPR1L:及CCP1CON(bit4,bit5)確定高電平時間, CCP1CON=0x0f; INTCON=0x00; //關(guān)閉總中斷及外圍中斷 PR2=0x31; //16位，設(shè)定周期,即頻率，設(shè)定的值與頻率大小成反比 //通過周期的倒數(shù)計算時間，單位us，再轉(zhuǎn)為16進制,或直接輸入10進制的值 TRISC=0xfb; //設(shè)RC2為PWM輸出 T2CON=0x04; //開啟TMR2，預(yù)分頻為1,bit2=1為TIMER2使能位,bit1:bit0為預(yù)分頻 } voidmain(void) { CCP1_init(); //PWM初始化 while(1) { ; } }
照上面做就行了
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@adengadeng
include#include voidCCP1_init(void) { CCPR1L=0x19; //通過設(shè)CCPR1L:及CCP1CON(bit4,bit5)確定高電平時間, CCP1CON=0x0f; INTCON=0x00; //關(guān)閉總中斷及外圍中斷 PR2=0x31; //16位，設(shè)定周期,即頻率，設(shè)定的值與頻率大小成反比 //通過周期的倒數(shù)計算時間，單位us，再轉(zhuǎn)為16進制,或直接輸入10進制的值 TRISC=0xfb; //設(shè)RC2為PWM輸出 T2CON=0x04; //開啟TMR2，預(yù)分頻為1,bit2=1為TIMER2使能位,bit1:bit0為預(yù)分頻 } voidmain(void) { CCP1_init(); //PWM初始化 while(1) { ; } }
看不懂，還得多學(xué)學(xué)源代碼呀！
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這個是我的半橋程序，有哪位大俠能幫我看看啊！！！
//spwm調(diào)制，逆變器,
#include
#define uchar unsigned char
#define uint unsigned int
__CONFIG(0X3F32);
const uchar sinTab[200]={ //調(diào)制度M=0.9;正弦波代碼數(shù)組
0,1,2,3,4,5,6,7,8,10,
11,12,13,14,15,16,17,18,19,20,
21,22,23,24,25,26,27,28,29,30,
31,32,33,33,34,35,36,37,38,39,
40,41,41,42,43,44,45,45,46,47,
48,48,49,50,51,51,52,53,53,54,
55,55,56,56,57,58,58,59,59,60,
60,61,61,62,62,62,63,63,64,64,
64,65,65,65,65,66,66,66,66,66,
67,67,67,67,67,67,67,67,67,67,
67,67,67,67,67,67,67,67,67,
67,66,66,66,66,66,65,65,65,65,
64,64,64,63,63,62,62,62,61,61,
60,60,59,59,58,58,57,56,56,55,
55,54,53,53,52,51,51,50,49,48,
48,47,46,45,45,44,43,42,41,41,
40,39,38,37,36,35,34,33,33,32,
31,30,29,28,27,26,25,24,23,22,
21,20,19,18,17,16,15,14,13,12,
11,10,8,7,6,5,4,3,2,1,0
};
/*基波50Hz,載波20KHz,半周期內(nèi)的采樣點數(shù)為100，則pwm的周期=1/20ms=50us*/
/*SPWM初始化*/
uchar B_D=0,i;
void init()
{
TRISB=0X28; //
PR2=149; //SPWM為50uS=150*4*(1/12)
CCP1CON=0XBd; //spwm模式選擇,半橋1011,1101,A、c高有效，b、d低有效
CCPR1L=0; //占空比為0
PWM1CON=0X00; //
TMR2IF=0;
T2CON=0X04; //不分頻，使能TMR2
}
void tmr2()
{
if(TMR2IF)
{
if(i==200)
{
i=0;
B_D=!B_D;
}
if(B_D)
{
TRISB=0X20; //B...C
}
else
{
TRISB=0X08; //D...A
}
PR2=149; //SPWM為50uS=150*4*(1/12)
CCPR1L=sinTab[i];
TMR2IF=0;
i++;
}
}
void main ()
{
init();
while(1)
{
tmr2();
}
}
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@adengadeng
include#include voidCCP1_init(void) { CCPR1L=0x19; //通過設(shè)CCPR1L:及CCP1CON(bit4,bit5)確定高電平時間, CCP1CON=0x0f; INTCON=0x00; //關(guān)閉總中斷及外圍中斷 PR2=0x31; //16位，設(shè)定周期,即頻率，設(shè)定的值與頻率大小成反比 //通過周期的倒數(shù)計算時間，單位us，再轉(zhuǎn)為16進制,或直接輸入10進制的值 TRISC=0xfb; //設(shè)RC2為PWM輸出 T2CON=0x04; //開啟TMR2，預(yù)分頻為1,bit2=1為TIMER2使能位,bit1:bit0為預(yù)分頻 } voidmain(void) { CCP1_init(); //PWM初始化 while(1) { ; } }
要是產(chǎn)生SPWM還需要不斷修改CCPR1L中的數(shù)值。不知道在SPWM半橋輸出的時候，這個死區(qū)需要怎么設(shè)置？設(shè)置的時候需要注意些什么？不過我感覺在正弦波由正半周向負(fù)半軸切換的時候其脈沖寬度很窄，基本為零，是不是就不在需要進行死區(qū)設(shè)置了。哪位大師做過啊，能不能分享下。
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@adengadeng
include#include voidCCP1_init(void) { CCPR1L=0x19; //通過設(shè)CCPR1L:及CCP1CON(bit4,bit5)確定高電平時間, CCP1CON=0x0f; INTCON=0x00; //關(guān)閉總中斷及外圍中斷 PR2=0x31; //16位，設(shè)定周期,即頻率，設(shè)定的值與頻率大小成反比 //通過周期的倒數(shù)計算時間，單位us，再轉(zhuǎn)為16進制,或直接輸入10進制的值 TRISC=0xfb; //設(shè)RC2為PWM輸出 T2CON=0x04; //開啟TMR2，預(yù)分頻為1,bit2=1為TIMER2使能位,bit1:bit0為預(yù)分頻 } voidmain(void) { CCP1_init(); //PWM初始化 while(1) { ; } }
CCPR1L=0x19; //通過設(shè)CCPR1L:及CCP1CON(bit4,bit5)確定高電平時間,
這個怎么算它的高電平，看不懂公式
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@wubaoxue
這個是我的半橋程序，有哪位大俠能幫我看看啊！！！//spwm調(diào)制，逆變器,#include#defineucharunsignedchar#defineuintunsignedint__CONFIG(0X3F32);constucharsinTab[200]={ //調(diào)制度M=0.9;正弦波代碼數(shù)組0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,33,34,35,36,37,38,39,40,41,41,42,43,44,45,45,46,47,48,48,49,50,51,51,52,53,53,54,55,55,56,56,57,58,58,59,59,60,60,61,61,62,62,62,63,63,64,64,64,65,65,65,65,66,66,66,66,66,67,67,67,67,67,67,67,67,67,67,67,67,67,67,67,67,67,67,67,67,66,66,66,66,66,65,65,65,65,64,64,64,63,63,62,62,62,61,61,60,60,59,59,58,58,57,56,56,55,55,54,53,53,52,51,51,50,49,48,48,47,46,45,45,44,43,42,41,41,40,39,38,37,36,35,34,33,33,32,31,30,29,28,27,26,25,24,23,22,21,20,19,18,17,16,15,14,13,12,11,10,8,7,6,5,4,3,2,1,0};/*基波50Hz,載波20KHz,半周期內(nèi)的采樣點數(shù)為100，則pwm的周期=1/20ms=50us*//*SPWM初始化*/ucharB_D=0,i;voidinit(){ TRISB=0X28;// PR2=149;//SPWM為50uS=150*4*(1/12) CCP1CON=0XBd; //spwm模式選擇,半橋1011,1101,A、c高有效，b、d低有效 CCPR1L=0;//占空比為0 PWM1CON=0X00;// TMR2IF=0; T2CON=0X04;//不分頻，使能TMR2}void tmr2(){ if(TMR2IF) { if(i==200) { i=0; B_D=!B_D; } if(B_D) { TRISB=0X20;//B...C } else { TRISB=0X08;//D...A } PR2=149;//SPWM為50uS=150*4*(1/12) CCPR1L=sinTab[i]; TMR2IF=0; i++; }}voidmain(){ init(); while(1) { tmr2(); }}
你的pic16f877a程序調(diào)試的怎么樣了？我在論壇二手交易買的那個2000W逆變器單片機壞了能發(fā)個程序么？或者買你都可以
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