基于STM32處理器 定時器比較輸出測試程序

這里給出最關鍵的三個文件

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(); //系統時鐘設置及外設時鐘使能

NVIC_Configuration(); //中斷源配置

time_ini(); //定時器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); //定時器3 時鐘使能

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1; //PB5復用為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; //預分頻器TIM3_PSC=63

TIM3_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //計數器向上計數模式 TIM3_CR1[4]=0

TIM3_TimeBaseStructure.TIM_Period =0xffff; //自動重裝載寄存器TIM3_APR

TIM3_TimeBaseStructure.TIM_ClockDivision = 0x0; //時鐘分頻因子 TIM3_CR1[9:8]=00

TIM_TimeBaseInit(TIM3,&TIM3_TimeBaseStructure); //寫TIM3各寄存器參數

TIM3_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle ; //TIM3_CCMR1[14:12]=011 翻轉當TIM3_CCR2=TIM3_CNT時，翻轉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信號輸出到對應的輸出引腳PB5

TIM3_OCInitStructure.TIM_Pulse =CCR3_Val; //若CC1通道配置為輸出：CCR2是裝入當前捕獲/比較2 TIM3_CCR2寄存器的值（預裝載值）。

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信號輸出到對應的輸出引腳PB5

TIM3_OCInitStructure.TIM_Pulse =CCR4_Val; //若CC1通道配置為輸出：CCR2是裝入當前捕獲/比較2 TIM3_CCR2寄存器的值（預裝載值）。

TIM_OC4Init(TIM3, &TIM3_OCInitStructure);

TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Disable); //TIM3_CCMR1[1]=0 禁止TIM3_CCR2寄存器的預裝載功能，可隨時寫入TIM3_CCR2

TIM_Cmd(TIM3,ENABLE); //啟動定時器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) //判斷狀態寄存器 TIM3_SR[2] 是否發生了捕獲/比較2 中斷

{

TIM_ClearITPendingBit(TIM3, TIM_IT_CC3); //軟件清除狀態寄存器 TIM3_SR[2] 捕獲/比較2 中斷中斷標志

capture1 = TIM_GetCapture3(TIM3); //獲取TIM3_CCR2的預裝值

TIM_SetCompare3(TIM3, capture1+ CCR3_Val); //和CCR2_Val累加后裝入TIM3_CCR2 這是為了配合計數器值的遞增。以在下一次作出比較。

}

if (TIM_GetITStatus(TIM3, TIM_IT_CC4) != RESET) //判斷狀態寄存器 TIM3_SR[2] 是否發生了捕獲/比較2 中斷

{

TIM_ClearITPendingBit(TIM3, TIM_IT_CC4); //軟件清除狀態寄存器 TIM3_SR[2] 捕獲/比較2 中斷中斷標志

capture1 = TIM_GetCapture4(TIM3); //獲取TIM3_CCR2的預裝值

TIM_SetCompare4(TIM3, capture1+ CCR4_Val); //和CCR2_Val累加后裝入TIM3_CCR2 這是為了配合計數器值的遞增。以在下一次作出比較。

}

}