求教：TIM3部分重映射，PB5(CH2)可以输出PWM，PB0(CH3)无PWM输出

fuyuhangxiao · 发表于 2021-10-13 12:53:45

///////////////////////////////////////////////////////////
//°′¼üÇD»»Õ¼¿Õ±è
///////////////////////////////////////////////////////////
#include <stm32f10x.h>

#define KEY1 GPIO_Pin_0
#define KEY2 GPIO_Pin_13

#define KEY1_STATUS  GPIO_ReadInputDataBit(GPIOA,KEY1)//¶áè¡°′¼ü1
#define KEY2_STATUS  GPIO_ReadInputDataBit(GPIOC,KEY2)//¶áè¡°′¼ü2

////////////////////////////////////////////////////////////////////////
//í¨óÃÑóê±oˉêy
////////////////////////////////////////////////////////////////////////
#define TIME_MS 12000 //@72M

//3¤Ñóê±oˉêy
void Delay_ms(unsigned int n)
{
unsigned int i,j;

for(i=n;i>0;i--)
for(j=TIME_MS;j>0;j--);
}

//ÅäÖÃKEY¶Ôó|¶Ë¿ú
void KEY_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOC, ENABLE );

GPIO_InitStructure.GPIO_Pin = KEY1;//KEY1(PA.0)
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = KEY2;//KEY2(PC.13)
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}

//ÅäÖÃí¨óÃ¶¨ê±Æ÷TIM3￡¬óÃóúPWMμ÷Ëù
void TIM3_PWMInit(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO
            |RCC_APB2Periph_GPIOB, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; //PB0(LED_R′úìæ·çéè)¸′óÃÎaTIM3_CH2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD; //¸′óÃ¿aÂ©êä3öÄ￡ê½
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; //PB1(LED_G)ÎaTIM3_CH3
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //¸′óÃíÆíìêä3öÄ￡ê½
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);

TIM_TimeBaseStructure.TIM_Prescaler =1 ; //Ô¤·ÖÆμÖμ1+1=2￡¬êäèë¼ÆêyÆ÷36MHz
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_CenterAligned1; //ÖDÑë¶ÔÆëÄ￡ê½
TIM_TimeBaseStructure.TIM_Period =35999; //ÖüÆú35999+1=36000￡&#172

WMÆμÂê500Hz
TIM_TimeBaseStructure.TIM_ClockDivision = 0x0; //ê±Öó·ÖÆμòò×ó

TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);

GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3,ENABLE); ////TIM32¿·ÖÖØó3éä

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //PWMÄ￡ê½1￡oÖDÑë¶ÔÆëÄ￡ê½ ÔúÏòéÏ¼Æêyê±ÖD¶Ï±êÖ¾ÖÃÎ»￡¬
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //ÕyÏòêä3ö¼«DÔ  ¸ßμçÆ½óDD§
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //ÕyÏòêä3öÔêDí
TIM_OCInitStructure.TIM_Pulse = 999; //è·¶¨Õ¼¿Õ±è￡¬Õa¸öÖμ¾ö¶¨áËóDD§μçÆ½μÄê±¼ä

TIM_OC2Init(TIM3, &TIM_OCInitStructure); //êä3öí¨μà2ÅäÖÃoˉêy
TIM_OC3Init(TIM3, &TIM_OCInitStructure); //êä3öí¨μà3ÅäÖÃoˉêy

TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable); //ê1ÄüÔ¤×°ÔØ¼Ä′æÆ÷
TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable); //ê1ÄüÔ¤×°ÔØ¼Ä′æÆ÷

TIM_Cmd(TIM3,ENABLE); //Æô¶ˉTIM3
}

/* °′¼ü′|àíoˉêy
·μ»Ø°′¼üÖμ
0￡¬Ã»óDèÎoÎ°′¼ü°′ÏÂ
1￡¬KEY1°′ÏÂ
2￡¬KEY2°′ÏÂ
×￠òa′ËoˉêyóDÏìó|óÅÏè¼¶,KEY1>KEY2!! */
u8 KEY_Scan()
{
if(KEY1_STATUS==0 || KEY2_STATUS==0) //¼ì2a°′¼üêÇ·ñ°′ÏÂ
{
Delay_ms(100); //·à¶¶Ñóê±

if(KEY1_STATUS==1) //¼ì2aKEY1êÇ·ñ°′ÏÂ
return 1;

else if(KEY2_STATUS==1) //¼ì2aKEY2êÇ·ñ°′ÏÂ
return 2;
}
return 0; //ÎT°′¼ü°′ÏÂ
}

//ÅäÖÃËùóDíaéè
void Init_All_Periph(void)
{
SystemInit();

KEY_Configuration();
TIM3_PWMInit();
}

//Ö÷oˉêy
int main(void)
{
u16 width[3]={25000,35000};
u16 i=0,pwm=width[0];

Init_All_Periph();

while(1)
{
i=KEY_Scan();
if(i!=0)
{
pwm=width[i-1];
TIM_SetCompare1(TIM3, pwm);
TIM_SetCompare2(TIM3, pwm);
    }
}
}