用按键调节占空比的实验，按键没有用，而且占空比会自动的变化，这是什么原因？

木槿昔年 · 发表于 2018-8-28 17:30:17

#include "led.h"
#include "delay.h"
#include "sys.h"
#include "key.h"
#include "pwm.h"
//#include "usart.h"
//#include "exti.h"

int main(void)
{
u8 t=0;
   static int au;
delay_init();
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
LED_Init();
KEY_Init();
uart_init(9600);
// EXTIX_Init();
  TIM3_PWM_Init(23999,2);
     au=12000;
while(1)
{

TIM_SetCompare4(TIM3,au);

    t=KEY_Scan(0);
switch(t)
   {
// case KEY0_PRES:
//       au+=240;
// delay_ms(50);
// break;
case KEY1_PRES:
au-=240;
delay_ms(50);
break;
default:
delay_ms(10);
      }
}

}

#include "key.h"
#include "delay.h"
#include "stm32f10x.h"
void KEY_Init(void)
{

GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOC,ENABLE);//ê1ÄüPORTA,PORTCê±Öó

GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable, ENABLE);//1Ø±Õjtag￡¬ê1ÄüSWD￡¬¿éòÔóÃSWDÄ￡ê½μ÷êÔ

GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_15;//PA15
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //éèÖÃ3ééÏà-êäèë
GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉGPIOA15

GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_5;//PC5
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //éèÖÃ3ééÏà-êäèë
GPIO_Init(GPIOC, &GPIO_InitStructure);//3õê¼»ˉGPIOC5

GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_0;//PA0
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; //PA0éèÖÃ3éêäèë￡¬Ä¬èÏÏÂà-
GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉGPIOA.0

GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_9;//PC9
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; //PA0éèÖÃ3éêäèë￡¬Ä¬èÏÏÂà-
GPIO_Init(GPIOC, &GPIO_InitStructure);//3õê¼»ˉGPIOA.0

}
u8 KEY_Scan(u8 mode)
{
static u8 key_up=1;//°′¼ü°′Ëé¿a±êÖ¾
if(mode)key_up=1;  //Ö§3Öá¬°′
if(key_up&&(KEY0==0||KEY1==0||WK_UP==1))
{
delay_ms(10);//è￥¶¶¶ˉ
   key_up=0;
if(KEY0==0)return KEY0_PRES;
else if(KEY1==0)return KEY1_PRES;
else if(WK_UP==1)return WKUP_PRES;
}else if(KEY0==1&&KEY1==1&&WK_UP==0)key_up=1;
return 0;
}

#include "pwm.h"
#include "led.h"
#include "delay.h"
#include "key.h"
#include "stm32f10x_tim.h"
void TIM3_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);//
//RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);  //ê1ÄüGPIOíaéèê±Öóê1Äü
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC|RCC_APB2Periph_AFIO , ENABLE);


//éèÖÃ¸Ãòy½ÅÎa¸′óÃêä3ö1|Äü,êä3öTIM1 CH1μ&#196

WMÂö3å2¨DÎ
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; //TIM_CH1
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //¸′óÃíÆíìêä3ö
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15; //TIM_CH1
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //¸′óÃíÆíìêä3ö
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //TIM_CH1
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //¸′óÃíÆíìêä3ö
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);

GPIO_PinRemapConfig(GPIO_FullRemap_TIM3,ENABLE);

//3õê¼»ˉ¶¨ê±Æ÷
TIM_TimeBaseStructure.TIM_Period = arr; //éèÖÃÔúÏÂò»¸ö¸üDÂêÂ¼t×°èë»î¶ˉμÄ×Ô¶ˉÖØ×°ÔØ¼Ä′æÆ÷ÖüÆúμÄÖμ    80K
TIM_TimeBaseStructure.TIM_Prescaler =psc; //éèÖÃóÃà′×÷ÎaTIMxê±ÖóÆμÂê3yêyμÄÔ¤·ÖÆμÖμ  2»·ÖÆμ
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //éèÖÃê±Öó·Ö¸î:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIMÏòéÏ¼ÆêyÄ￡ê½
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //¸ù¾YTIM_TimeBaseInitStructÖDÖ¸¶¨μÄ2Îêy3õê¼»ˉTIMxμÄê±¼ä»ùêyμ￥Î»

//3õê¼»ˉ±è½Ï2Îêy
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //Ñ¡Ôñ¶¨ê±Æ÷Ä￡ê½:TIMÂö3å¿í¶èμ÷ÖÆÄ￡ê½2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //±è½Ïêä3öê1Äü
TIM_OCInitStructure.TIM_Pulse = 0; //éèÖÃ′y×°èë2¶»ñ±è½Ï¼Ä′æÆ÷μÄÂö3åÖμ
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC4Init(TIM3, &TIM_OCInitStructure);

  //TIM_CtrlPWMOutputs(TIM1,ENABLE); //MOE Ö÷êä3öê1Äü

TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);  //CH1Ô¤×°ÔØê1Äü

TIM_ARRPreloadConfig(TIM3, ENABLE); //ê1ÄüTIMxÔúARRéÏμÄÔ¤×°ÔØ¼Ä′æÆ÷

TIM_Cmd(TIM3, ENABLE);  //ê1ÄüTIM1

}