stm32F1外部脈沖計(jì)數(shù)(庫(kù)函數(shù)實(shí)現(xiàn))(共7頁(yè))

1、主函數(shù)#include stm32f10x.h#include timer.h#include led.h#include delay.h#include oled.h#include sys.hint main(void) u16 t=0; delay_init(); LED_Init(); TIM3_PWM_Init(9999,719); TIM2_Excnt_Init(10); OLED_Init(); NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); OLED_ShowString(20,0,EXCNT_TEST,16); OLED_Ref

2、resh_Gram(); TIM_SetCompare2(TIM3,1000); while(1) delay_ms(1);t=TIM_GetCounter(TIM2); OLED_ShowNum(20,30,t,6,16); OLED_Refresh_Gram(); timer.c#include timer.h#include led.h#include usart.h#include oled.hvoid TIM3_PWM_Init(u16 arr,u16 psc) GPIO_InitTypeDef GPIO_InitStructure;TIM_TimeBaseInitTypeDef T

3、IM_TimeBaseStructure;TIM_OCInitTypeDef TIM_OCInitStructure;RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE); /使能GPIO外設(shè)和AFIO復(fù)用功能模塊時(shí)鐘使能GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE); /Timer3部分重映射 TIM3_CH2-PB5 /用于TIM3的C

4、H2輸出的PWM通過(guò)該LED顯示 /設(shè)置該引腳為復(fù)用輸出功能,輸出TIM3 CH2的PWM脈沖波形GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; /TIM_CH2GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; /復(fù)用推挽輸出GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOB, &GPIO_InitStructure);/GPIO_WriteBit(GPIOA, GPIO_Pin_7,Bit_SET); / PA7上拉TIM_TimeB

5、aseStructure.TIM_Period = arr; /設(shè)置在下一個(gè)更新事件裝入活動(dòng)的自動(dòng)重裝載寄存器周期的值 80KTIM_TimeBaseStructure.TIM_Prescaler =psc; /設(shè)置用來(lái)作為TIMx時(shí)鐘頻率除數(shù)的預(yù)分頻值 不分頻TIM_TimeBaseStructure.TIM_ClockDivision = 0; /設(shè)置時(shí)鐘分割:TDTS = Tck_timTIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; /TIM向上計(jì)數(shù)模式TIM_TimeBaseInit(TIM3, &TIM_Time

6、BaseStructure); /根據(jù)TIM_TimeBaseInitStruct中指定的參數(shù)初始化TIMx的時(shí)間基數(shù)單位 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; /選擇定時(shí)器模式:TIM脈沖寬度調(diào)制模式2TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; /比較輸出使能TIM_OCInitStructure.TIM_Pulse = 0; /設(shè)置待裝入捕獲比較寄存器的脈沖值TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPol

7、arity_High; /輸出極性:TIM輸出比較極性高TIM_OC2Init(TIM3, &TIM_OCInitStructure); /根據(jù)TIM_OCInitStruct中指定的參數(shù)初始化外設(shè)TIMxTIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable); /使能TIMx在CCR2上的預(yù)裝載寄存器TIM_ARRPreloadConfig(TIM3, ENABLE); /使能TIMx在ARR上的預(yù)裝載寄存器 TIM_Cmd(TIM3, ENABLE); /使能TIMx外設(shè) /定時(shí)器2外部脈沖計(jì)數(shù)函數(shù)void TIM2_Excnt_Init(u16

8、arr) GPIO_InitTypeDef GPIO_InitStructure;TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;NVIC_InitTypeDef NVIC_InitStructure;RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);/使能GPIOA和TIM2的時(shí)鐘RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);TIM_DeInit(TIM2);GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN

9、_FLOATING;GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0;GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;GPIO_Init(GPIOA, &GPIO_InitStructure);TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;TIM_TimeBaseStructure.TIM_Period=arr;TIM_TimeBaseStructu

10、re.TIM_Prescaler=0;TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure); TIM_ETRClockMode2Config(TIM2,TIM_ExtTRGPSC_OFF,TIM_ExtTRGPolarity_NonInverted,10); /ExtTRGFilter：外部觸發(fā)濾波器。該參數(shù)取值在0x0和0xF之間。在我所在的環(huán)境下設(shè)置為10經(jīng)檢測(cè)最準(zhǔn)確。NVIC_InitStructure.NVIC_IRQChannel=TIM2_IRQn;NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;NVIC_InitStructure.NVIC_IRQChannelSubPriority=3;NVIC_Init(&NVIC_InitStructure); /中斷優(yōu)先級(jí)設(shè)置，搶占優(yōu)先級(jí)為1，響應(yīng)優(yōu)先級(jí)為3TIM_ITConfig(TIM2,TIM_IT_Update|TIM_IT_CC1,ENABLE);/使能TIM2中斷TIM_SetCounter(