分享stm32mini板子PWM输入模式测试周期和占空比的程序

lifan_cn · 发表于 2013-9-17 11:11:58

一直以来在论坛只问没有分享过,感谢原子的耐心解答，今天我就将我写的PWM输入库函数版本程序分享一下，已经在开发板通过了！我没有处理溢出问题，如果你的周期足够大，那么你自己加上这个机制。

------------------------------------------------------------------------------------------main.c------------------------------------------------------------------------

#include "led.h"
#include "delay.h"
#include "key.h"
#include "sys.h"
#include "usart.h"
#include "timer.h"
//ALIENTEK????STM32??·?°????é9
//PWM???????é
//?????§????www.openedv.com
//?????????í??×?????????????

extern u16 DutyCycle,Frequency,IC2Value;
int main(void)
{

SystemInit();
delay_init(72);     //???±??????????
NVIC_Configuration(); //?è??NVIC????·?×é2:2??????????????2???ì????????
uart_init(9600); //????????????9600
TIM3_PWMINPUT_INIT(0xFFFF,72-1);

while(1){
  delay_ms(20);
  printf("DutyCycle = %d\r\n",DutyCycle);
  printf("Frequency = %d\r\n",Frequency);
// printf("IC2Value = %d\r\n",IC2Value);
}

}
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------time.c-------------------------------------------------------------------------------------------------------------
#include "timer.h"
#include "led.h"
#include "usart.h"
//////////////////////////////////////////////////////////////////////////////////
//±????ò?????§?°?????????×÷???í???????????????ü????????
//ALIENTEK Mini STM32??·?°?
//PWM ?????ú??
//?????×?@ALIENTEK
//????????:www.openedv.com
//????????:2010/12/03
//°?±???V1.0
//°??¨?ù??????°?±?????
//Copyright(C) ?????×? 2009-2019
//All rights reserved
//////////////////////////////////////////////////////////////////////////////////

//?¨???¨?±?÷??????????
//?????±????????APB1??2±?????APB1??36M
//arr??×?????×°????
//psc???±???¤·?????
//?????????????¨?±?÷3!
void TIM3_PWMINPUT_INIT(u16 arr,u16 psc)
{

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
TIM_ICInitTypeDef TIM3_ICInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);     //open TIM3 clock
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);  //open gpioA clock

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;                               //GPIO??
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

TIM_TimeBaseStructure.TIM_Period = arr; //?è???????????ü??????×°????????×?????×°???????÷???????? ??????5000??500ms
TIM_TimeBaseStructure.TIM_Prescaler =psc; //?è??????×÷??TIMx?±?????????????¤·????? 10Khz??????????
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //?è???±??·???:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM?ò??????????
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //?ù??TIM_TimeBaseInitStruct?????¨????????????TIMx???±???ù??????

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);

TIM3_ICInitStructure.TIM_Channel = TIM_Channel_2;
TIM3_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM3_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM3_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM3_ICInitStructure.TIM_ICFilter = 0x0;

TIM_PWMIConfig(TIM3, &TIM3_ICInitStructure);
TIM_SelectInputTrigger(TIM3, TIM_TS_TI2FP2);
TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Reset);
TIM_SelectMasterSlaveMode(TIM3, TIM_MasterSlaveMode_Enable);
TIM_Cmd(TIM3, ENABLE);
TIM_ITConfig(TIM3, TIM_IT_CC2, ENABLE);
}

u16 IC2Value = 0,DutyCycle = 0,Frequency = 0;

void TIM3_IRQHandler(void)
{

TIM_ClearITPendingBit(TIM3, TIM_IT_CC2);                //??TIM???????

IC2Value = TIM_GetCapture2(TIM3);                         //??IC2???????,??PWM??????
if (IC2Value != 0)
{

    DutyCycle = TIM_GetCapture1(TIM3);
    Frequency = IC2Value;                                          //??PWM???
}
else
{
    DutyCycle = 0;
    Frequency = 0;
}
}
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------