#include "stm32f4xx.h"
#include <stdio.h>
#define DS1 GPIOF_Pin_9
#define DS2 GPIO_Pin_10
//???±????//?¨????????????????????????????????????C?????????????????ú??????·¨·???????????
static void Delay(__IO uint32_t nCount)
{
for (; nCount != 0; nCount--)
{
}
}
int main (void)
{
uint16_t CCR1_Val=333;
uint16_t CCR2_Val=249;
uint16_t CCR3_Val=166;
uint16_t CCR4_Val=83;
u16 led0pwmval=0;
u8 dir=1;
// uint16_t PrescalerValue=0;
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
//NVIC_InitTypeDef NVIC_InitStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
RCC_APB1PeriphClockCmd(RCC_AHB1Periph_GPIOC,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9| GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOF, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8|GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
GPIO_Init(GPIOC, &GPIO_InitStructure);
//????±í??io??c×é??????????
GPIO_PinAFConfig(GPIOC,GPIO_PinSource6,GPIO_AF_TIM3);
GPIO_PinAFConfig(GPIOC,GPIO_PinSource7,GPIO_AF_TIM3);
GPIO_PinAFConfig(GPIOC,GPIO_PinSource8,GPIO_AF_TIM3);
GPIO_PinAFConfig(GPIOC,GPIO_PinSource9,GPIO_AF_TIM3);
//PrescalerValue=(uint16_t) (SystemCoreClock/12000)-1;
TIM_TimeBaseInitStructure.TIM_Period =500-1;
TIM_TimeBaseInitStructure.TIM_Prescaler=84-1;
TIM_TimeBaseInitStructure.TIM_CounterMode=TIM_CounterMode_Up;
TIM_TimeBaseInitStructure.TIM_ClockDivision=TIM_CKD_DIV1;
TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStructure);
//????±à?????·PWM?????????ò
/*Channel1*/
TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;//????PWM??????
TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;//±???????????
TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;//?????????§
TIM_OCInitStructure.TIM_Pulse=CCR1_Val;
TIM_OC1Init(TIM3,&TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM3,ENABLE);
TIM_Cmd(TIM3,ENABLE);
/*Channel2*/
TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;//????PWM??????
TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;//±???????????
TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;//?????????§
TIM_OCInitStructure.TIM_Pulse=CCR2_Val;
TIM_OC2Init(TIM3,&TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM3,ENABLE);
TIM_Cmd(TIM3,ENABLE);
/*Channel3*/
TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;//????PWM??????
TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;//±???????????
TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;//?????????§
TIM_OCInitStructure.TIM_Pulse=CCR3_Val;
TIM_OC3Init(TIM3,&TIM_OCInitStructure);
TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM3,ENABLE);
TIM_Cmd(TIM3,ENABLE);
/*Channel4*/
TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;//????PWM??????
TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;//±???????????
TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;//?????????§
TIM_OCInitStructure.TIM_Pulse=CCR4_Val;
TIM_OC4Init(TIM3,&TIM_OCInitStructure);
TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM3,ENABLE);
TIM_Cmd(TIM3,ENABLE);
//?????¨????????????????±?PWM??????±???±???
//void TIM_SetCompare1(); ??????·¨?????è????????×é????????°???×é??????????????TIMx_CCR??????±?????±???????????ABC?à?????ò??·??ò????
// TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);
//
//
//
// NVIC_InitStructure.NVIC_IRQChannel=TIM3_IRQn;
// NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;
// NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;
// NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
// NVIC_Init(&NVIC_InitStructure);
// TIM_Cmd(TIM3,ENABLE);
GPIO_ResetBits(GPIOF, GPIO_Pin_9);
GPIO_SetBits(GPIOF, GPIO_Pin_10);
while(1)
{
Delay(1000);
if(dir)led0pwmval++;
else led0pwmval--;
if(led0pwmval>300)dir=0;
if(led0pwmval==0)dir=1;
TIM_SetCompare1(TIM3,led0pwmval);
TIM_SetCompare2(TIM3,led0pwmval);
TIM_SetCompare3(TIM3,led0pwmval);
TIM_SetCompare4(TIM3,led0pwmval);
//GPIO_ResetBits(GPIOF, GPIO_Pin_9);
// GPIO_ResetBits(GPIOF, GPIO_Pin_10);
//GPIO_ResetBits(GPIOF, GPIO_Pin_7);
//Delay(100);
}
}
// void TIM3_IRQHandler(void)
// {
// if (TIM_GetITStatus(TIM3,TIM_IT_Update)==SET)
// {
//
//
// GPIO_SetBits(GPIOF, GPIO_Pin_10);
// GPIO_ResetBits(GPIOF, GPIO_Pin_9);
// }
// TIM_ClearITPendingBit(TIM3,TIM_IT_Update);
//
//
// }
这是修改的程序,在MDK上模拟仿真时,显示不出PWM波?请大侠们,指点。
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