#include "pwm.h"
#include "key.h"
#include "usart.h"
#include "delay.h"
void TIM2_PWM_Init(u32 arr,u32 psc)
{
//′Ë2¿·ÖDèêÖ¶ˉDT¸ÄIO¿úéèÖÃ
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE); //TIM2ê±Öóê1Äü
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); //ê1Äü¶Ë¿úê±Öó
GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_TIM2); //GPIOA2¸′óÃÎa¶¨ê±Æ÷2
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //GPIOA2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //¸′óÃ1|Äü
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; //Ëù¶è100MHz
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //íÆíì¸′óÃêä3ö
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //éÏà-
GPIO_Init(GPIOA,&GPIO_InitStructure); //3õê¼»ˉPA2
TIM_TimeBaseStructure.TIM_Prescaler=psc; //¶¨ê±Æ÷·ÖÆμ
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //ÏòéϼÆêyÄ£ê½
TIM_TimeBaseStructure.TIM_Period=arr; //×Ô¶ˉÖØ×°ÔØÖμ
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;
TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure);//3õê¼»ˉ¶¨ê±Æ÷2
//3õê¼»ˉTIM2 Channel3 PWMÄ£ê½
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //Ñ¡Ôñ¶¨ê±Æ÷Ä£ê½:TIMÂö3å¿í¶èμ÷ÖÆÄ£ê½2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //±è½Ïêä3öê1Äü
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //êä3ö¼«DÔ:TIMêä3ö±è½Ï¼«DÔμí
TIM_OC3Init(TIM2, &TIM_OCInitStructure); //¸ù¾YTÖ¸¶¨μÄ2Îêy3õê¼»ˉíaéèTIM2OC3
TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Enable); //ê1ÄüTIM2ÔúCCR1éÏμÄԤװÔؼÄ′æÆ÷
TIM_CtrlPWMOutputs(TIM2,ENABLE);
TIM_ARRPreloadConfig(TIM2, ENABLE);
TIM_Cmd(TIM2, ENABLE);
}
void Set_Duty_Cycle(u8 key)
{
static u16 duty_cycle = 210; //static ¶¨òåòaÔú ÆäËüDÎê½μıäῶ¨òå֮ǰ£»
switch(key)
{
case 1:
{
if(duty_cycle >= 420)
{
duty_cycle = 420;
}
else
{
duty_cycle += 10;
}
TIM_SetCompare1 (TIM14, duty_cycle);
}
break;
case 2:
{
if(duty_cycle <= 0)
{
duty_cycle = 0 ;
}
else
{
duty_cycle -= 10;
}
TIM_SetCompare1 (TIM14, duty_cycle);
}
break;
}
}
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还有 TIM_SetCompare1这个数字1代表的是一通道吧
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