#include "timer.h"
void TIM3_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //LED0-->PA.8 ¶Ë¿úÅäÖÃ
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //íÆíìêä3ö
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //IO¿úËù¶èÎa50MHz
GPIO_Init(GPIOA, &GPIO_InitStructure); //¸ù¾Yé趨2Îêy3õê¼»ˉGPIOA.8
GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3,ENABLE);
TIM_TimeBaseInitStructure.TIM_ClockDivision=0;
TIM_TimeBaseInitStructure.TIM_CounterMode=TIM_CounterMode_Up;
TIM_TimeBaseInitStructure.TIM_Period=arr;
TIM_TimeBaseInitStructure.TIM_Prescaler=psc;
TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStructure);
TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0; //éèÖÃ′y×°èë2¶»ñ±è½Ï¼Ä′æÆ÷μÄÂö3åÖμ
TIM_OC2Init(TIM3,&TIM_OCInitStructure);
TIM_CtrlPWMOutputs(TIM3,ENABLE);
TIM_OC2PreloadConfig(TIM3,TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM3,ENABLE);
TIM_Cmd(TIM3,ENABLE);
}
int main(void)
{
u16 led0pwmval=0;
u8 dir=1;
delay_init(); //Ñóê±oˉêy3õê¼»ˉ
LED_Init(); //3õê¼»ˉóëLEDᬽóμÄó2¼t½ó¿ú
TIM3_PWM_Init(899,0);//2»·ÖÆμ¡£PWMÆμÂê=72000/(899+1)=80Khz
while(1)
{
delay_ms(10);
if(dir)led0pwmval++;
else led0pwmval--;
if(led0pwmval>300)dir=0;
if(led0pwmval==0)dir=1;
TIM_SetCompare1(TIM3,led0pwmval);
}
}
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int main(void)
{
u16 led0pwmval=0;
u8 dir=1;
delay_init();
LED_Init();
TIM3_PWM_Init(899,0);
while(1)
{
delay_ms(10);
if(dir)led0pwmval++;
else led0pwmval--;
if(led0pwmval>300)dir=0;
if(led0pwmval==0)dir=1;
TIM_SetCompare2(TIM1,led0pwmval);
}
}
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);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
TIM_TimeBaseStructure.TIM_Period = arr;
TIM_TimeBaseStructure.TIM_Prescaler =psc;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC2Init(TIM3, &TIM_OCInitStructure);
TIM_CtrlPWMOutputs(TIM3,ENABLE);
TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM3, ENABLE);
TIM_Cmd(TIM3, ENABLE);
}
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