参照野火的程序实现PWM波输出，TIM3的定时没有问题，但是依样画葫芦将程序改写成TIM8则无法输出PWM波。我所做的更改是将GPIO配置中APB1改为APB2,由PA口改为PC6,7,8,9，在配置定时器最后的时候增加了TIM_CtrlPWMOutputs(TIM8 ,ENABLE );
* S  Q  w- B4 y* L7 C其余没有变动。
如果有任何建议都感激不尽，附文本代码与代码截图。

1 y  t/ h7 B5 c; B# e: O0 ovoid TIM8_GPIO_Config(void)
{
        GPIO_InitTypeDef GPIO_InitStructure;

0 _; [0 b0 M3 p. K6 H        /* ÉèÖÃTIM8CLK Ϊ 72MHZ */
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE);

        /* GPIOC clock enable */
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);

0 p  |8 i: p: M9 K& ^( j+ T        /*GPIOC Configuration: TIM8 channel 1 and 2 as alternate function push-pull */
! ]$ @! h6 \' V5 l0 J        GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9;
! X' \( _6 i* P- J1 k8 \' I9 z        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;                    // ¸´ÓÃÍÆÍìÊä³ö
' d) S% s* w- n$ K+ \        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
: U. c3 y: E& f$ G, K  c1 }        GPIO_Init(GPIOC, &GPIO_InitStructure);
) B' f' f$ ^, {0 D}
0 w8 m+ t, O! q7 d" ^
/**
  * @brief  ÅäÖÃTIM8Êä³öµÄPWMÐźŵÄģʽ£¬ÈçÖÜÆÚ¡¢¼«ÐÔ¡¢Õ¼¿Õ±È
' x: z" B- ^9 y' r2 I& x  * @param  ÎÞ
  * @retval ÎÞ
  */
' O+ H8 C4 q; V/ r. J$ [9 l: b/*
- O) i- E6 G. p( @( l, l4 _5 d0 s * TIMxCLK/CK_PSC --> TIMxCNT --> TIMx_ARR --> TIMxCNT ÖØмÆÊý
*                    TIMx_CCR(µçƽ·¢Éú±ä»¯)
* ÐźÅÖÜÆÚ=(TIMx_ARR +1 ) * ʱÖÓÖÜÆÚ
& F6 Q+ g. \- ~4 E( ? * Õ¼¿Õ±È=TIMx_CCR/(TIMx_ARR +1)
8 V8 Q1 C( L6 j; K( ^: s */
void TIM8_Mode_Config(void)
6 N  o0 f, g- X& s' E  k: b{
        TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
2 `& K  \* ~9 s" X        TIM_OCInitTypeDef  TIM_OCInitStructure;
& Y& ^# Z1 ?1 V# w5 W        
        //TIM_DeInit(TIM8); //
        
        /* PWMÐźŵçƽÌø±äÖµ */
         u16 CCR1_Val = 500;        
         u16 CCR2_Val = 375;
5 ]4 N7 \7 P. L) |% [! i7 R         u16 CCR3_Val = 250;
         u16 CCR4_Val = 125;

/* -----------------------------------------------------------------------
1 y7 D1 B! `6 |  }    TIM8 Channel1 duty cycle = (TIM3_CCR1/ TIM3_ARR+1)* 100% = 50%
1 C5 F0 u: J9 i    TIM8 Channel2 duty cycle = (TIM3_CCR2/ TIM3_ARR+1)* 100% = 37.5%
    TIM8 Channel3 duty cycle = (TIM3_CCR3/ TIM3_ARR+1)* 100% = 25%
! W, e1 Y% [; Y3 N& V! Z    TIM8 Channel4 duty cycle = (TIM3_CCR4/ TIM3_ARR+1)* 100% = 12.5%
  ----------------------------------------------------------------------- */
0 v* J2 X/ b  w8 j
        /* Time base configuration */                 
        TIM_TimeBaseStructure.TIM_Period = 999;       //µ±¶¨Ê±Æ÷´Ó0¼ÆÊýµ½999£¬¼´Îª1000´Î£¬ÎªÒ»¸ö¶¨Ê±ÖÜÆÚ
        TIM_TimeBaseStructure.TIM_Prescaler = 1800;            //ÉèÖÃÔ¤·ÖƵ£º1800·ÖƵ£¬¼´Îª40KHz
        TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1 ;        //ÉèÖÃʱÖÓ·ÖƵϵÊý£º²»·ÖƵ(ÕâÀïÓò»µ½)
        TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //ÏòÉϼÆÊýģʽ
( r$ O% P+ F# u        TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0;
        TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure);

        /* PWM1 Mode configuration: Channel1 */
        TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;            //ÅäÖÃΪPWMģʽ1
        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
& Q# y0 T4 h/ _        TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;        
, H' o6 D# |; P3 T. }# ~  f. R+ o        TIM_OCInitStructure.TIM_Pulse = CCR1_Val;           //ÉèÖÃÌø±äÖµ£¬µ±¼ÆÊýÆ÷¼ÆÊýµ½Õâ¸öֵʱ£¬µçƽ·¢ÉúÌø±ä
0 ]5 P+ H; a( T9 k        TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;  //µ±¶¨Ê±Æ÷¼ÆÊýֵСÓÚCCR1_ValʱΪ¸ßµçƽ
4 Y) E- I, d# g: U. u% s; B0 w: ^        TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
        TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
        TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
4 M4 Q5 h$ H5 W" G* r+ V        TIM_OC1Init(TIM8, &TIM_OCInitStructure);         //ʹÄÜͨµÀ1
  b) ]$ ^4 N3 Z& f* ^        TIM_OC1PreloadConfig(TIM8, TIM_OCPreload_Enable);
4 O: d  n9 ]2 C8 Q1 y
1 s1 R* ^  K! X& H0 z7 {: Z        /* PWM1 Mode configuration: Channel2 */
4 H  o9 Y. m2 ~9 z) Y7 v! A        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
        TIM_OCInitStructure.TIM_Pulse = CCR2_Val;          //ÉèÖÃͨµÀ2µÄµçƽÌø±äÖµ£¬Êä³öÁíÍâÒ»¸öÕ¼¿Õ±ÈµÄPWM
        TIM_OC2Init(TIM8, &TIM_OCInitStructure);          //ʹÄÜͨµÀ2
        TIM_OC2PreloadConfig(TIM8, TIM_OCPreload_Enable);
9 F# a+ U& ^) a8 m8 C( I+ o
& Q6 Y6 |9 i6 s+ W! Y( R        /* PWM1 Mode configuration: Channel3 */
        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
0 g7 |$ X3 S* L2 H# M; D        TIM_OCInitStructure.TIM_Pulse = CCR3_Val;        //ÉèÖÃͨµÀ3µÄµçƽÌø±äÖµ£¬Êä³öÁíÍâÒ»¸öÕ¼¿Õ±ÈµÄPWM
8 ]5 T, b( l2 L, T: z+ i, E  A) E        TIM_OC3Init(TIM8, &TIM_OCInitStructure);         //ʹÄÜͨµÀ3
        TIM_OC3PreloadConfig(TIM8, TIM_OCPreload_Enable);

        /* PWM1 Mode configuration: Channel4 */
3 i6 T* t; g" H. C) q        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
; O6 B: b1 d" N+ w6 g$ V        TIM_OCInitStructure.TIM_Pulse = CCR4_Val;        //ÉèÖÃͨµÀ4µÄµçƽÌø±äÖµ£¬Êä³öÁíÍâÒ»¸öÕ¼¿Õ±ÈµÄPWM
        TIM_OC4Init(TIM8, &TIM_OCInitStructure);        //ʹÄÜͨµÀ4
; R9 M7 S( [7 O, d( b" ^; o        TIM_OC4PreloadConfig(TIM8, TIM_OCPreload_Enable);
3 |1 y; Q# I7 b# K. r" r8 w6 B: Y        TIM_ARRPreloadConfig(TIM8, ENABLE);                         // ʹÄÜTIM3ÖØÔؼĴæÆ÷ARR

( |) Y- Z/ G5 t, k+ [' R$ F        /* TIM3 enable counter */
        TIM_Cmd(TIM8, ENABLE);                   //ʹÄܶ¨Ê±Æ÷8
1 m, r9 e) ?  v) A/ b        TIM_CtrlPWMOutputs(TIM8 ,ENABLE );

& P- Y4 b& y3 ^" l5 F

谢谢楼主分享

JackieLaura 发表于 2015-9-7 23:43
谢谢楼主分享

这个方法不错，每次多赚一分

风子 发表于 2015-9-7 23:49
+ Z) J3 p% E1 w- j3 T这个方法不错，每次多赚一分

这个也是借鉴别人的
& N  I# C+ ]% j; O. W4 {8 q

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