這里給出最關(guān)鍵的三個(gè)文件
main.c文件
#include "stm32f10x.h"
#include "stm32f10x_tim.h"
#include "misc.h"
unsigned int CCR3_Val=5000;
unsigned int CCR4_Val=10000;
extern void time_ini(void);
void RCC_Configuration(void)
{
SystemInit();
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC
| RCC_APB2Periph_GPIOD| RCC_APB2Periph_GPIOE , ENABLE);
}
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
NVIC_InitStructure.NVIC_IRQChannel =TIM3_IRQn ; //配置定時(shí)器中斷
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
int main(void)
{
RCC_Configuration(); //系統(tǒng)時(shí)鐘設(shè)置及外設(shè)時(shí)鐘使能
NVIC_Configuration(); //中斷源配置
time_ini(); //定時(shí)器3的初始化
while(1);
}
Tim.c文件
#include "stm32f10x_tim.h"
#include "stm32f10x_gpio.h"
#include
void time_ini(void);
extern unsigned int CCR3_Val;
extern unsigned int CCR4_Val;
TIM_TimeBaseInitTypeDef TIM3_TimeBaseStructure;
TIM_OCInitTypeDef TIM3_OCInitStructure;
TIM_BDTRInitTypeDef TIM3_BDTRInitStructure;
void time_ini(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //定時(shí)器3 時(shí)鐘使能
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1; //PB5復(fù)用為TIM3的通道2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3 , ENABLE);
TIM3_TimeBaseStructure.TIM_Prescaler = 7200; //預(yù)分頻器TIM3_PSC=63
TIM3_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //計(jì)數(shù)器向上計(jì)數(shù)模式 TIM3_CR1[4]=0
TIM3_TimeBaseStructure.TIM_Period =0xffff; //自動(dòng)重裝載寄存器TIM3_APR
TIM3_TimeBaseStructure.TIM_ClockDivision = 0x0; //時(shí)鐘分頻因子 TIM3_CR1[9:8]=00
TIM_TimeBaseInit(TIM3,&TIM3_TimeBaseStructure); //寫TIM3各寄存器參數(shù)
TIM3_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle ; //TIM3_CCMR1[14:12]=011 翻轉(zhuǎn)當(dāng)TIM3_CCR2=TIM3_CNT時(shí)，翻轉(zhuǎn)OC2REF的電平
TIM3_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //輸出極性 低電平有效 TIM3_CCER[5]=1;
TIM3_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //輸入/捕獲2輸出允許 OC2信號(hào)輸出到對(duì)應(yīng)的輸出引腳PB5
TIM3_OCInitStructure.TIM_Pulse =CCR3_Val; //若CC1通道配置為輸出：CCR2是裝入當(dāng)前捕獲/比較2 TIM3_CCR2寄存器的值（預(yù)裝載值）。
TIM_OC3Init(TIM3, &TIM3_OCInitStructure);
TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Disable);
TIM3_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //輸入/捕獲2輸出允許 OC2信號(hào)輸出到對(duì)應(yīng)的輸出引腳PB5
TIM3_OCInitStructure.TIM_Pulse =CCR4_Val; //若CC1通道配置為輸出：CCR2是裝入當(dāng)前捕獲/比較2 TIM3_CCR2寄存器的值（預(yù)裝載值）。
TIM_OC4Init(TIM3, &TIM3_OCInitStructure);
TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Disable); //TIM3_CCMR1[1]=0 禁止TIM3_CCR2寄存器的預(yù)裝載功能，可隨時(shí)寫入TIM3_CCR2
TIM_Cmd(TIM3,ENABLE); //啟動(dòng)定時(shí)器3 TIM3_CR1[0]=1;
TIM_ITConfig(TIM3,TIM_IT_CC3|TIM_IT_CC4,ENABLE); //TIM3_DIER[2]=1 允許捕獲/比較2中斷
}
stm32f10x_it.c文件
#include "stm32f10x.h"
#include "stm32f10x_tim.h"
unsigned int capture1=0;
extern unsigned int CCR3_Val;
extern unsigned int CCR4_Val;
extern TIM_OCInitTypeDef TIM3_OCInitStructure;
void TIM3_IRQHandler(void)
{
if (TIM_GetITStatus(TIM3, TIM_IT_CC3) != RESET) //判斷狀態(tài)寄存器 TIM3_SR[2] 是否發(fā)生了捕獲/比較2 中斷
{
TIM_ClearITPendingBit(TIM3, TIM_IT_CC3); //軟件清除狀態(tài)寄存器 TIM3_SR[2] 捕獲/比較2 中斷中斷標(biāo)志
capture1 = TIM_GetCapture3(TIM3); //獲取TIM3_CCR2的預(yù)裝值
TIM_SetCompare3(TIM3, capture1+ CCR3_Val); //和CCR2_Val累加后裝入TIM3_CCR2 這是為了配合計(jì)數(shù)器值的遞增。以在下一次作出比較。
}
if (TIM_GetITStatus(TIM3, TIM_IT_CC4) != RESET) //判斷狀態(tài)寄存器 TIM3_SR[2] 是否發(fā)生了捕獲/比較2 中斷
{
TIM_ClearITPendingBit(TIM3, TIM_IT_CC4); //軟件清除狀態(tài)寄存器 TIM3_SR[2] 捕獲/比較2 中斷中斷標(biāo)志
capture1 = TIM_GetCapture4(TIM3); //獲取TIM3_CCR2的預(yù)裝值
TIM_SetCompare4(TIM3, capture1+ CCR4_Val); //和CCR2_Val累加后裝入TIM3_CCR2 這是為了配合計(jì)數(shù)器值的遞增。以在下一次作出比較。
}
}
加入技術(shù)交流群
評(píng)論